® Part #470656 IG/IGX Make-Up Air Unit Installation, Operation and Maintenance Manual Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property damage! Retain instructions for future reference. General Safety Information Only qualified personnel should install this unit.
Receiving Upon receiving the product, check to make sure all items are accounted for by referencing the bill of lading to ensure all items were received. Inspect each crate for shipping damage before accepting delivery. Notify the carrier if any damage is noticed. The carrier will make notification on the delivery receipt acknowledging any damage to the product. All damage should be noted on all the copies of the bill of lading which is countersigned by the delivering carrier.
. After storage period, purge grease before putting fan into service. Indirect Gas Fired Unit Installations Units are listed for installation in the United States and Canada. • Installation of gas fired duct furnaces must conform with local building codes. In the absence of local codes, installation must conform to the National Fuel Gas code, ANSI Z223.1 or in Canada, CAN/ CGA-B149 installation codes.
Installation of Indoor Unit Installation of Arrangement DB / HZ NOTE To prevent premature heat exchanger failure, do not locate units where chlorinated, halogenated, or acid vapors are present. 1. Install Hangers Install threaded hangers from ceiling supports. When locating hangers, allow enough room to open access panel(s). Two nuts must be used on the end of each threaded hanger. Ceiling supports are supplied by others. 2. Install Unit Raise the unit into place.
NOTE The use of all lifting lugs and a set of spreader bars is mandatory when lifting the unit. NOTE Some units come with the weatherhood attached and step 5 may not apply. 2. Install Combination Curb Adaptor Install combination curb adaptor over curb, use wood screws to lag in place. Locate extension so the tall louvered side is over the exhaust opening, as shown in illustration. Caulk extension to combination curb adaptor. Fasten extension to curb adaptor with #12 sheet metal screws (field provided).
Installation of Roof Mounted Unit Arrangement DBC, continued 4. Apply Sealant Apply an appropriate sealant around the perimeter of the curb and duct adapter(s) to isolate fan vibration and prevent water penetration. 7. Install Supply Unit Use a crane and a set of spreader bars hooked to the factory lifting lugs to lift and center the unit on the extension/equipment support(s). Use self-tapping sheet metal screws to fasten the unit to the extension/equipment support(s).
Installation of Evaporative Cooling Module (optional) NOTE 1. Follow Guidelines Small evaporative coolers ship attached to the base unit and require no additional mounting. 1. Locate Equipment Support(s) Position equipment support(s) on the roof (reference the CAPS submittal for Metal Cover placement of equipment support(s) in relation to Equipment the unit). Verify that all unit Support supports are level, shim if necessary.
Installation of Venting for Indoor Units Warning The following guidelines must be followed for all indoor units: 1. Installation of venting must conform with local building codes. In the absence of local codes, installation must conform with the National Fuel Gas Code, ANSI Z223.1 or in Canada, CAN/ CGA-B149 installations codes. 2. For the exhaust pipe, use pipe approved for a category III appliance or single wall, 26 gauge or heavier galvanized vent pipe. The piping is required to be gas tight by ANSI. 3.
Installation of Standard Indoor Venting Vent Pipe Diameter Standard Indoor Venting uses one penetration through an exterior wall or roof for venting the flue exhaust. The combustion air is supplied from the air inside the building. Units must not be installed in a potentially explosive, flammable, or corrosive atmosphere. To prevent premature heat exchanger failure, do not locate unit where chlorinated, halogenated or acid vapors are present.
Installation of Concentric Venting (General) Concentric venting allows the exhaust pipe and combustion air pipe to pass through a single hole in the roof or wall of the building. A concentric venting adapter (CVA) is required for concentric venting. The concentric venting adapter is designed for indoor installations and should never be installed on the exterior of the building. Concentric Venting – Horizontal Refer to the diagram below for venting on horizontal concentric systems.
3. Install Exhaust Pipe Slide the exhaust pipe through the CVA. Provide enough exhaust piping to pass through the wall (or floor) and provide the minimum clearance of 12 inches between the exhaust pipe termination and the combustion air intake. With all required clearances satisfied, attach the exhaust pipe to the CVA. INTAKE END Exhaust Connection (Model IGX) Exhaust Connection (Model IG) DISCHARGE END Concentric Venting – Vertical Refer to the diagram below for venting on vertical concentric systems.
2. Attach Mounting Brackets Attach field-supplied, corrosion resistant, mounting brackets to the CVA using corrosion resistant sheet metal screws. 3. Install Exhaust Pipe Slide the exhaust pipe through the CVA. Provide enough exhaust piping to pass through the roof and provide the minimum clearance of 12 inches between the exhaust pipe termination and the combustion air intake. With all required clearances satisfied, attach the exhaust pipe to the CVA. 7.
Installation of Two Pipe Venting – Horizontal 2. Install Combustion Air Pipe Run a combustion air pipe from the unit’s combustion air intake through the exterior wall to the outdoors. The combustion air pipe must terminate at least 12 inches from the combustion vent pipe and 24 inches from the exterior surface of the outside wall. Attach the combustion air inlet guard to the end of the combustion air pipe. Using field-supplied mounting brackets, support the combustion air pipe as needed.
Installation of Two Pipe Venting – Vertical Refer to the diagram below for venting on vertical concentric systems. The combustion air pipe must terminate at least 12 inches above the roof. This clearance may need to be increased to accommodate for snow accumulation. The exhaust must terminate at least 12 inches above and 12 inches horizontally from the combustion air inlet. C Exhaust Vent Terminal Combustion Air Inlet Terminal B A COMBUSTION AIR EXHAUST Roof Line 1.
Installation - Electrical Wiring IMPORTANT Before connecting power to the unit, read and understand the following instructions and wiring diagrams. Complete wiring diagrams are attached on the inside of the control center door(s). 1. Determine the Size of the Main Power Lines The unit’s nameplate states the voltage and the unit’s total MCA. The main power lines to the unit should be sized accordingly. The nameplate is located on the outside of the unit on the control panel side.
6. Wire the Evaporative Cooler (optional) Reference the ladder diagram on the inside of the control center door for correct wiring of the pump and the optional water valves. note Large evaporative coolers may require a separate power supply. 7. Install Economizer Sensors (optional) All economizer options (EC) require an outdoor air temperature or enthalpy sensor to be field installed inside of the weatherhood and field wired to terminals SO+ and SO- on the economizer.
Installation of Gas Piping IMPORTANT All gas piping must be installed in accordance with the latest edition of the National Fuel Gas Code ANSI/Z223.1 and any local codes that may apply. In Canada, the equipment shall be installed in accordance with the Installation Code for Gas Burning Appliances and Equipment (CGA B149) and Provincial Regulations for the class. Authorities having jurisdiction should be consulted before installations are made. 1.
Installation - Evaporative Cooler Piping (optional) Evaporative Cooling with Recirculating Pump Evaporative Cooling with Auto Drain and Fill Supply Line Supply Line Sump Overflow Supply Line Valve (normally closed) Drain Line Valve (normally open) Drain Line Overflow VALVE A Supply Solenoid (normally closed) Sump Drain VALVE C Sump Drain Solenoid (normally open) VALVE B Supply Line Drain Solenoid (normally open) Trap Trap Drain Line Recirculating Evaporative Piping Auto Drain & Fill Evaporative
1. Install the Water Supply Line Supply line opening requirements vary by unit size and arrangement and are field-supplied. Connect the water supply line to the float valve through the supply line opening in the evaporative cooling unit. Install the 1/2 inch normally closed solenoid (Valve A) in the supply line. Install the 1/4 inch normally open solenoid (Valve B) between the supply line and the drain line as shown. 2.
Installation of Water Wizard™, Installation - Direct Expansion (DX) Coil Piping (optional) continued To Media Important Pressure Gauge Factory Installed Guidelines for the installation of direct expansion cooling coils have been provided to ensure proper performance and longevity of the coils. These are general guidelines that may have to be tailored to meet the specific requirements of any one job. As always, a qualified party or individual should perform the installation and maintenance of any coil.
Note If a hot gas bypass kit was provided by others, refer to the manufacturer’s instructions. 3. Install Suction Line Install suction line(s) from the compressor to the suction connection(s) which are stubbed through the side of the cabinet. 4. Install the Liquid Line and Thermal Expansion Valve (TEV) (By Others) Liquid line openings vary by coil size and circuiting and are field-supplied. Follow the TEV recommendations for installation to avoid damaging the valve.
Installation of Chilled Water Coil Piping (optional) Installation of Building Pressure Control (optional) 1. Mount Pressure Tap Important Guidelines for the installation of the cooling coil have been provided to ensure proper performance of the coils and their longevity. These are general guidelines that may have to be tailored to meet the specific requirements of any one job. As always, a qualified party or individual should perform the installation and maintenance of the coil.
Start-Up - Blower Note Refer to the Start-Up Checklist in the Reference Section Before Proceeding Further! Pre Start-Up Check Rotate the fan wheel by hand and make sure no parts are rubbing. Check the V-belt drive for proper alignment and tension (a guide for proper belt tension and alignment is provided in the Belt Maintenance section). Check fasteners, set screws, and locking collars on the fan, bearings, drive, motor base, and accessories for tightness.
Note The most accurate way to measure the air volume is by using a pitot traverse method downstream of the blower. Other methods can be used but should be proven and accurate. Important Changing the air volume can significantly increase the motor’s amps. If the air volume is changed, the motor’s amps must be checked to prevent overloading the motor. Note To ensure accuracy, the dampers are to be open when measuring the air volume. 6.
Start-Up - Furnaces (all units) important For the unit to function properly, all stage or modulation valves must be set for high and low fire. Note There are five furnace control options available. Be sure to refer to the specific instructions for your control type. important Multi furnace units may use a combination of the available control options. Each furnace must be setup per the specific instructions for its control type.
Start-Up - 2:1 Staged Control Start-Up - 8:1 Staged Control 1. Send Unit to High Fire important Send the unit to high fire by setting the temperature selector to its Temperature maximum setting. 2. Check the High Fire Manifold Pressure 8:1 staged furnaces use two manifolds and two staged gas valves per furnace. The high and low fire manifold pressure must be checked and properly set on each manifold. Selector Using a manometer, measure the burner manifold pressure at the manifold pressure test port.
High Fire Adjustment Low Fire Adjustment High Fire Terminal 6. Access the Discharge Air Temperature Setting Using the Up or Down key, scroll through the Setpoints Menu until the display reads “dtS”, then press the Enter key. The display will change to the discharge air temperature setting. 7. Edit the Setting 3. Send the Unit to Low Fire Disconnect and isolate the wire from the high fire terminal to send the unit to low fire. 4.
10. Access the Room Override Setting From the Setpoints Menu, use the Up or Down key to navigate through the menu options until the display reads “rot.” Once the display reads “rot,” press the Enter key. The display will change to the room override setting. Note The room override function requires a field-supplied thermostat to be installed in the space and to be wired between terminal 31 and 32 in the unit’s control center. Reference the unit ladder diagram. 11.
Start-Up - 2:1 Electronic Modulation 1. Send Unit to High Fire Turn the temperature selector to its maximum setting to send the unit to high fire. Note The low fire manifold pressure should always be rechecked after adjusting the high fire. Temperature Selector Note Once the high and low fire manifold pressures are properly set, reset the discharge air temperature to the desired setting. 2.
Start-Up - 4:1 Electronic Modulation 1. Send the Unit to High Fire To send the unit to high fire, press and hold the Up, Down and Enter keys. The unit will remain at high fire until the Function key is pressed. Function Up Enter Down Warning If the unit is forced to high fire, it will remain at high fire until the Function key is pressed. note After modifying a setting, the Enter key must be pressed to save the change.
Note: If the valve remains in the low fire setting mode for more than five (5) minutes, it will revert back to its previous setting. note The following steps are for adjusting the discharge air setting. The discharge air temperature setting is factory set to the recommended 70ºF. Only adjust the setting if needed. 6. Access the Setpoints Menu Press and hold the Function key for three seconds to access the Setpoints Menu. The display will read “SEt” when Setpoints Mode is active. 7.
Start-Up - Economizer (optional) Note To prevent premature heat exchanger failure, do not locate units where chlorinated, halogenated, or acid vapors are present. Note Units with an economizer are designed for either 0-30% outside air (HV-1), 31-75% outside air (HV‑2) or 100% return air (HV-3). Refer to the CAPS submittal for the unit’s ventilation type. Note HV-1 and HV-2 use economizer controls (EC) or (MB).
Start-Up - Evaporative Cooling (optional) Bleed-Off Valve Supply Connection Float Valve Threaded Float Adjustment Overflow 1. Check the Installation The media may have been removed during installation, so its orientation should be double checked. The media Entering Air should be installed with the steeper flute angle sloping down towards the entering air side. Pump Filter 45º Leaving Air 15º Verify that the stainless steel caps and distribution headers are in place.
Start-Up - Water Wizard™ (optional) L1 L2 L3 Function Up Enter Down Water Wizard™ User Interface Key Function Description 1. Open the Solenoid Confirm that the manual water supply valve is closed. Press and hold the Function key for one second. L3 will begin blinking (short on, long off), indicating that Flow Test Mode is active and the supply solenoid is open. Warning Opening the manual supply valve will allow water to pass to the media.
NOTE Caution The Freeze Temperature is preset to the factory recommended 45ºF. Steps 9-11 should only be completed if the Freeze Temperature needs adjustment. NOTE The Freeze Temperature is the temperature at which the supply solenoid closes and the drain solenoid opens to drain the supply line, preventing possible freeze damage. A drain solenoid is required for this option. 9. Enter Program Mode Press and hold the Enter key for three seconds. The display will read “Pro” when Program Mode is active.
Check Operation - VAV Units (optional) Building Pressure Control — a variable frequency drive is controlled according to input from a pressure sensing device. NOTE Blower Start-Up, Steps 1-5 should be performed before the blower is run. NOTE For maintenance issues associated with variable frequency drives, consult the drive’s manual supplied with the unit. The drives are programmed at the factory and should not need any adjustment during installation and start-up.
Check Operation - Recirculating Units (optional) NOTE Blower Start-Up, steps 1-5 should be performed before the blower is run. Building Pressure Control - a modulating spring return actuator is used to control the return air amounts. The return air damper modulates from fully open to fully closed based on a signal from a remote pressure sensing device.
Sequence of Operation 2:1 Staged Sequence 1. Exhaust Fan Contact (S1) Manually Closed (optional) • Power passes through N.C. contact on exhaust fan overload (ST2 OL), which is closed if exhaust fan (M2) has not overloaded • Power passes to exhaust fan starter (ST2) • N.O. contact on exhaust fan starter (ST2) is energized and closed • Power passes to and energizes exhaust fan (M2) 2. Supply Fan Contact (S2) Manually Closed • Power passes through N.C.
Sequence of Operation 2:1 Modulation Sequence 1. Exhaust Fan Contact (S1) Manually Closed (optional) • Power passes through N.C. contact on exhaust fan overload (ST2 OL), which is closed if exhaust fan (M2) has not overloaded • Power passes to exhaust fan starter (ST2) • N.O. contact on exhaust fan starter (ST2) is energized and closed • Power passes to and energizes exhaust fan (M2) 2. Supply Fan Contact (S2) Manually Closed • Power passes through N.C.
Sequence of Operation Operation 2:1 Modulation Sequence, continued 4:1 Modulation and 8:1 Staged Controller • N.O. contact on cool relay (RC) is energized and closed • Power passes to evaporative cooling pump (P1) *If DX or chilled water coils are used rather than an evaporative cooler, the cooling sequence of operation will depend on the coil controls. Cooling coil controls are supplied by others.
Program Revision Number To access the program revision number from the default display, press the Up or Down key until the display reads F##, J## or I##. The two numbers following the letter indicate the revision number. For example, F12 indicates program F, revision twelve. Optional Room Override (ROt) When the room override function is triggered, the discharge air temperature (70ºF default) is temporarily changed to the room override setting (90ºF default).
Sequence of Operation 4:1 Electronic Modulation, continued 4. Ignition Controller (IC1) Sequence of Operation • The N.O. contact on air proving switch (PS2) is open • The ignition controller (IC1) energizes the induction relay (IR) • N.O. contact on induction relay (IR) closes • Power passes to and energizes the combustion blower (CM), sending it to high speed • The N.O.
Sequence of Operation 8:1 Staged Control 1. Exhaust Fan Contact (S1) Manually Closed (optional) • Power passes through N.C. contact on exhaust fan overload (ST2 OL), which is closed if exhaust fan (M2) has not overloaded • Power passes to exhaust fan starter (ST2) • N.O. contact on exhaust fan starter (ST2) is energized and closed • Power passes to and energizes exhaust fan (M2) 2. Supply Fan Contact (S2) Manually Closed • Power passes through N.C.
Sequence of Operation 8:1 Staged Control, continued • N.O. contact on cool relay (RC) is energized and closed • Power passes to evaporative cooling pump (P1) *If DX or chilled water coils are used rather than an evaporative cooler, the cooling sequence of operation will depend on the coil controls. Cooling coil controls are supplied by others. Operation and Errors Ignition Controller NOTE The green LED light indicates NORMAL operation while the red LED light indicates an ERROR operation.
Operation - Economizer Note Only models IG-HV and IGX-HV with options EC-1, 2, 3 or 4 use an economizer. Option EC-1 (Outside Air Temperature Reference) This option uses one dry bulb temperature sensor field-installed in the inlet of the unit. A second dry bulb temperature sensor is factory-installed in the discharge of the unit. After a call for cooling, the outside air temperature is compared to the economizer set point.
Troubleshooting Blower Does Not Operate Proper supply power at main disconnect No Check Main Voltage (See Blower Start-Up Step #1) Main Disconnect (DS1) Off (Turn Main Disconnect DS1 On) Primary Fuses Blown (Replace Fuses) Yes 24 VAC between terminals R and X? No Main Transformer (TR1) Defective (Replace Transformer) Yes 24 VAC between terminals G and X? No Yes 24 VAC across terminals 3 and X? No Yes 24 VAC across terminals 4 and X? No Yes Supply Fan Overload (ST1 OL) Tripped (Reset and ch
Troubleshooting Motor Over Amps Air volume too high? Yes Adjust drives or increase external static pressure as needed. No (Reference Blower Start-Up Step #5) Actual static pressure lower than design? Yes Adjust drives to reduce blower RPM. No (Reference Blower Start-Up Step #5) Blower rotation correct? No Reverse blower rotation. Yes (Reference Blower Start-Up Step #2) Motor voltage correct? No Provide proper power supply.
Troubleshooting Insufficient Airflow Damper(s) not fully opened? Yes Adjust damper linkage(s), or replace faulty actuator(s). (Damper actuators may take a few minutes to open) No System static losses too high? Yes No Blower speed too low? Reduce losses by improving ductwork. Yes Adjust drives as needed. (Reference Blower Start-Up – Step #5) No Filters dirty or clogged? Yes Clean or replace filters.
Troubleshooting Excessive Noise or Vibration Belts worn or loose? Yes Replace worn belts or tighten loose belts. (Reference V-Belt Drives in the Maintenance section) No Sheaves aligned? No Align sheaves. (Reference V-Belt Drives in the Maintenance section) Yes Wheel(s) unbalanced? Yes Clean and/or balance wheel(s). No Bearings worn or need lubrication? Yes Replace worn bearings or lubricate bearings as needed.
Troubleshooting Single or 2:1 Stage Furnace Will Not Light 24 VAC across R and X? No Main disconnect (DS1) open or defective Close, repair or replace Main transformer (TR1) fault Replace main transformer Yes 24 VAC across W1 and X? No Heat Switch (S4) open (Turn Heat Switch (S4) on) Yes 24 VAC across 22 and 21? No Heating Transformer (TR2) Fault Replace heating transformer Yes 24 VAC across 24 VAC and 21 on SC1 controller? No Yes 24 VAC across A and 21? No Discharge air selector (TS2) impr
Troubleshooting 2:1 Modulating Furnace Will Not Light 24 VAC across R and X? No Main disconnect (DS1) open or defective Close, repair or replace Main transformer (TR1) fault Replace main transformer Yes 24 VAC across W1 and X? No Heat switch (S4) open or not wired Close or replace heat switch (S4) Yes 24 VAC across S and T? No Yes 24 VAC across C and T? Heat transformer (TR5) fault Replace heating transformer Discharge temperature was above high limit control (HLC1) Wait for high limit to cool
Troubleshooting 4:1 Modulating Furnace Will Not Light 24 VAC across R and X? No Main disconnect (DS1) open or defective Close, repair or replace Main transformer (TR1) fault Replace main transformer Yes 24 VAC across W1 and X? No Heat switch (S4) open or not wired Close or replace heat switch (S4) Yes 24 VAC across 22 and 21? No Heat transformer (TR2) fault Replace heating transformer Yes N.O. contact on heat relay (RH) closed? No Heat relay (RH) is not energized Check for loose connections.
Troubleshooting 4:1 Modulating Furnace Will Not Light ...continued from previous page High limit switch (HLC#) open? Yes Discharge temperature was above high limit setting Let cool, then reset high limit.
Troubleshooting 8:1 Staged Furnace Will Not Light 24 VAC across R and X? No Main disconnect (DS1) open or defective Close, repair or replace Main transformer (TR1) fault Replace main transformer Yes 24 VAC across W1 and X? No Heat switch (S4) open or not wired Close or replace heat switch (S4) Yes 24 VAC across 22 and 21? No Heat transformer (TR2) fault Replace heating transformer Yes N.O. contact on heat relay (RH) closed? No Heat relay (RH) is not energized Check for loose connections.
Troubleshooting 8:1 Staged Furnace Will Not Light ... continued from previous page.
Troubleshooting Evaporative Cooler does not Operate (Recirculating pump) Supply fan must be on for cooler to operate 24 VAC between terminals Y1 and X No Cool switch (S4) off (turn cool switch (S4) on) Cool switch not wired (wire cool switch (S4)) Yes 24 VAC between terminal A2 on Cooling Relay (RC) and X No Optional inlet air sensor (TS4) holding (Adjust TS4 setting.
Troubleshooting Water Wizard™ — Improper Water Supply note If the water supply is too low, the media will continuously appear dry. note If the water supply is too high, the media will be saturated and excessive water will be draining from the sump tank. note Some water drainage is desired to keep the media flushed, but it should be minimized to utilize the Water Wizard™. note Changing the On Time Factor by (1) will change the water supply by approximately 3%.
Maintenance - Routine Wheels Caution Lock-out the gas and the electrical power to the unit before performing any maintenance or service operations to this unit. V-Belt Drives V-belt drives must be checked on a regular basis for wear, tension, alignment, and dirt accumulation. Check the tension by measuring the deflection in the belt as shown below. Check the alignment by using a straight edge across both sheaves as shown below. Wheels require little attention when moving clean air.
Motors Motor maintenance is generally limited to cleaning and lubrication (where applicable). Cleaning should be limited to exterior surfaces only. Removing dust and grease build-up on the motor assures proper motor cooling. Motors supplied with grease fittings should be greased in accordance with the manufacturer’s recommendations. important Do not allow water or solvents to enter the motor or bearings. Motors and bearings should never be sprayed with steam, water or solvents.
Maintenance - Fall High Limit The high limit switch may have tripped over the summer; it should be checked and reset if necessary. caution Lock-out the gas and the electrical power to the unit before performing any maintenance or service operations to this unit. Gas Line Remove the drip leg and clean any liquid or debris that may have accumulated. Once the drip leg is cleaned, reattach it. Gas Train The gas connections, joints and valves should be checked annually for tightness.
Flushing Coils Manufacturer recommends the use of inhibited glycol (such as propylene or ethylene) to flush water coils to protect against freezing. Additionally, the use of inhibited glycol provides corrosion protection. The table below indicates the percentage of glycol required to prevent freezing in a coil at a given outdoor air freeze point. Completely fill coil with solution. Drain coil. Residual glycol fluid per these concentrations can be left in the coil without concern of freezing.
Reference - Model IG Venting Connection Location Exhaust Outlet Venting Location Dimensions Combustion Air Inlet Discharge End IG Housing A B C D E G 10 20 30 3.89 3.91 3.91 5.12 3.89 3.89 9.12 7.89 7.89 11.59 11.62 11.62 23.11 25.34 25.34 27.58 32.27 32.27 Dimensions are in inches. Dimensions B and E are not needed for standard venting. A round adapter should be used for the exhaust connection.
Reference - Model IG (Single or 2 Stage) 22 11 24 20 17 5 12 21 23 19 10 25 14 13 4 6 7 8 1 16 15 2 9 16 18 3 note This is a typical blower control center, the control center in your unit may be different. Reference the ladder diagram on the inside of the control center door for a unit specific wiring diagram. 1. Supply Motor Starter - 24 volt magnetic contacts for starting supply motor. 2. Supply Overload - Provides electronic overload protection to supply motor. 3.
Reference - Model IG (8:1 Staged) 24 22 10 11 5 12 21 23 25 19 20 17 16 13 4 1 14 6 7 8 15 2 9 18 3 18 note This is a typical blower control center, the control center in your unit may be different. Reference the ladder diagram on the inside of the control center door for a unit specific wiring diagram. 1. Supply Motor Starter - 24 volt magnetic contacts for starting supply motor. 2. Supply Overload - Provides electronic overload protection to supply motor. 3.
Reference - Model IG (2:1 Modulation) 11 17 20 10 21 23 25 14 13 4 1 18 5 12 22 24 26 6 7 8 15 2 9 19 3 16 note This is a typical blower control center, the control center in your unit may be different. Reference the ladder diagram on the inside of the control center door for a unit specific wiring diagram. 1. Supply Motor Starter - 24 volt magnetic contacts for starting supply motor. 2. Supply Overload - Provides electronic overload protection to supply motor. 3.
Reference - Model IG (4:1 Modulation) 25 23 11 21 18 5 12 22 24 20 10 26 18 16 13 4 1 14 6 7 8 15 2 9 19 3 17 note This is a typical blower control center, the control center in your unit may be different. Reference the ladder diagram on the inside of the control center door for a unit specific wiring diagram. 1. Supply Motor Starter - 24 volt magnetic contacts for starting supply motor. 2. Supply Overload - Provides electronic overload protection to supply motor. 3.
Reference - Model IGX (Blower Control Center) 14 15 9 3 12 10 4 6 7 1 17 8 19 18 16 11 5 2 13 20 16. Cooling Relay (Optional) - Allows power to pass to cooling controls. 17. Reset Timer (Optional) - Resets cooling system to run a time interval. 18. Auto Drain Relay (Optional) - Assures supply pump does not operate during drain interval. Allows pump to operate in cooling mode. 19. Cooling Timer (Optional) - Allows for automatic draining of the evaporative cooling system based on time schedule.
Reference - Model IGX (Single or 2 Stage) 5 Manifold 5 5 8 9 7 Gas Pressure Test Port 2 1 Reference - Model IGX (8:1 Staged) 1 Small Manifold Gas Pressure Test Port 2 Large Manifold 6 3 7 3 4 4 Staged Gas Valve 7 9 Staged Gas Valve 3/4 inch Gas Supply Connection 6 10 Gas Pressure Test Port 11 8 note This is a typical furnace control center, the control center in your unit may be different.
Reference - Model IGX (2:1 Modulation) Reference - Model IGX (4:1 Modulation) Manifold 5 1 Gas Pressure Test Port 6 4 Manifold 6 10 9 1 2 Gas Pressure Test Port 2 7 3 3 4 5 Modulating Gas Valve Staged Gas Valve Modulating Gas Valve 8 11 7 9 8 11 3/4 inch Gas Supply Connection note This is a typical furnace control center, the control center in your unit may be different. Reference the ladder diagram on the inside of the control center door for a unit specific wiring diagram. 1.
Reference - Performance Table Performance Table The following table gives the air volume in cubic feet per minute that is required to provide the desired temperature rise for a given heating input. Model IG has a maximum 7,000 CFM capacity.
Reference - Start-Up Checklist Start-Up Checklist Unit Model Number Unit Serial Number Start-Up Date Start-Up Personnel Name Start-Up Company Phone Number ____________________________ ____________________________ ____________________________ ____________________________ ____________________________ ____________________________ (e.g. IGX-120-H32-DB) (e.g.
Maintenance Log Date___________________ Time______________ AM/PM Date___________________ Time______________ AM/PM Notes:___________________________________________ Notes:___________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _________________________________________________ _______________________________________
