Installation guide

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a Place duct themmmeters in return and s_/pply ducts as close
to thruace as possible Be sure then_ometers do not 'see'
heat exchangers so that radiant heat does not affect ther=
mometer readings. This is particularly important with
straight run ducts
b. When thermometer readings stabilize, subtlact return-air
temperature t'rom supply=air tempe*ature to determine tern=
peramre rise.
If"the temperature rise is outside this range, check the tk_llowing:
a Gas input for low- and high gas heat operation
b. De*ate for altitude it"applicable.
c Return and supply ducts fbr excessive restrictions causing
static pressures greater than 0.50=in we.
d. Adjust temperature rise by adjusting blower speed. In=
crease blower speed to reduce temperature rise. Decrease
blower speed to increase temperature rise.
ELECTRICAL SHOCK HAZARD
Failure to %llow this waraiug could result in personal inju W
or death.
Disconnect 115-v electrical power before changing speed tap
For high=heat, the %llowing connections can be made at HI HEAT
on cmmol:
a. Me&high (Yellow)
b. Med (()range) -Available only ou 5-speed motors. FactoQ"
setting for these motors.
c. Me&Low (Blue) - Do NOT use Nr HI GAS-HEAT on
80K & 120K Btuh input models. Factow setting for
4-speed motors.
Ng_ : 0
UNIT DAMAGE HAZARD
Failure to %llow this caution may result in damage to the heat
exchangers due to over temperature or condensate corrosion
1 NEVER connect Low Speed (Red) wire to "HI HEAT"
2 Do NOT connect Medium Low Speed (Blue) wire to "HI
-HEAT" on 80,000 Btuh and 120,000 Bmh input model sizes
For tow-heat, d-_e %llowiug connections can be made at LO
-HEAT on control:
a Med (Orange) -Available only on 5=speed motors
b. Me&Low (Blue)
c Low (RED) - Factou- setting
To change blower motor speed selections for heating mode,
remove blower motor lead flora control HI-HEAT tem_iual. (See
Fig 32) Select desired blower motor speed lead t'rom one of d_e
other motor leads and relocate it to HI-HEAT terminal. See Table
13 ibr lead color identification Reconnect original lead on SPARE
terminal. Follow this same procedure ibr proper selection of
LO-HEAT and COOL speed selection.
Set Blower Off Delay
a Remove Blower Access Door if installed
b. Turn Dip switch 2 and 3 ON or OFF %r desired blower off
delay. See Table 9A and B or Fig. 3i and 32.
ADJUST BLOWER OFF DELAY (HEAT MODE)
If desired, the main blower off time delay period may be
lengthened or shortened when operating in the heating mode to
49
TaNe 1a-Speed Semection
LEAD COLOR
White
B_ack
Yellow
Orange1"
Blue
Red
* Continuous b_ovcer speed
SPEED AS SHIPP_=D
Common COM
High Coot
Med-High SPARE
Med High-Gas Heat
Med-Low Spare/High-Gas Heat
Low* Low-Gas Heat
? Available on 5-speed blowers only
provide greater com%rt. See Table 9 %r positiou of switches and
Fig 31 or 32 %r location of switches on control center
SET THERMOSTAT HEAT ANTICIPATOR
When using a nonelectronic thermostat, the them_ostat heat-
anticipator must be set to match the amp draw of the electrical
components in R=WiWl circuit. Accurate amp draw readings can
be obtained at them_ostat subbase terminals R and W.
Fig. 56 illustrates an easy method of obtaining actual amp &aw.
The amp reading should be taken after blower motor has started
and furnace is operating in low heat. To operate t\u'nace in
tow=heat, first move SW-I to ON position, then connect ammeter
wires as shown in Fig. 56. The them_ostat anticipator should NOT
be in the circuit while measuring current. If them_ostat has no
subbase, the thermostat mttst be disconnected from R and WiWI
wires during cmTent measurement Return SW-1 to final desired
location after completing the reading.
TERMINALS WITH
THERMOSTAT REMOVED
HOOK-AROUND
VOLT/AMMETER
10 TURNS
FROM UNIT 24-VOLT
TERMINAL BLOCK
EXAMPLE: 50 AMPS ON AMMETER = 0.5 AMPS FOR THERMOSTAT SETTING
10 TURNS AROUND JAWS
A80201
Fig. 56--Amp Draw Check with Ammeter
See thermostat manuii_cturer's instrllctions %r adjustiug heat
anticipator and for varying heating cycle length.
When using an electronic thermostat, set cycle rate for 3 cycles per
l'lo_.N"
Step 6--Check Safety Controls
This sectiou covers the safety contlols that must be checked befbre
the installation is complete The flame sensor, gas valve, and
pressure switch were all checked in the Start=up procedure section
as part of rmrmal operation.
1 Check Primary Limit Contlol