Use and Care Guide

MECHANICAL
THERMOSTAT
CLIMATE TECHNOLOGY
CORPORATION
When installing this product:
• Read these instructions thoroughly. Failure
to follow them could damage the product or
produce an unsafe condition.
• Check the rating in these instructions and
on the product to make sure the product is
compatible with your application.
• Installation must be performed by a trained,
experienced service technician.
• Upon completion of the installation, verify
the correct operation of the product as
detailed in these instructions.
THERMOSTAT MODELS AND APPLICATIONS
PART SWITCHING
NUMBER APPLICATION ORIENTATION SYSTEM FAN
43004A Use in standard heating/cooling systems Horizontal Heat-Off-Cool On-Auto
43005A Use in standard heating/cooling systems Vertical Heat-Off-Cool On-Auto
SPECIFICATIONS
ELECTRICAL DATA
Switch Rating: 24 VAC (30 VAC max.)
Heating - 0.15 to 1.2 amps
Cooling - 0 to 15 amps
Switch Action: Sealed Mechanical Switch
Anticipator Rating:
Heating - Adjustable from 0.15 to 1.2 amps
Coolinfg - 0 to 1.5 amps
THERMAL DATA
Temperature Range: 50°F - 90°F (10°C - 32°C)
APPLICATIONS
This thermostat is designed for use with:
• Standard heating and cooling systems
• Electric heating and cooling systems
• Single stage heat pump systems
• Two-transformer systems
• Electronic air cleaners
• Humidifiers
• Zone Dampers
This thermostat cannot be used with:
• Millivolt systems
• Multi-stage applications
WARNING!
To avoid electrical shock or equipment damage, make sure power is
disconnected before installation.
INSTALLATION
CTC thermostats regulate 24 to 30 VAC single-stage heating-cooling systems. See the chart below
for specific models and applications.
LOCATION
When installing this product:
The thermostat should be located in an area with good
air circulation at average temperature.
It should be on an inside wall.
DO NOT place the thermostat where it can be affected
by:
- drafts or dead spots behind doors or in corners.
- hot or cold air from ducts.
- radiant heat from the sun, fireplaces, or
appliances
- unheated (uncooled) areas behind the
thermostat, such as outside walls.
This thermostat is a precision instrument and was
carefully adjusted at the factory. Handle it carefully.
SERVICE INSTRUCTIONS
CALIBRATION
FIGURE 6 CALIBRATING THERMOSTAT
The thermostat is accurately calibrated before
leaving the factory and no further calibration should
be necessary. If the thermostat appears to be out
of calibration, or for any reason fails to function
properly, a qualified service person should proceed
as follows.
1. The anticipator’s heat may adversely affect
thermostat recalibration. To prevent this,
disconnect electrical power to the thermostat at
the furnace, main fuse, or breaker box.
2. Move temperature adjustment lever to a
setting about 5° above room temperature.
3. Remove thermostat cover. Slip 7/32”
wrench onto hex nut beneath bimetal.
While holding temperature adjustment lever
stationary, turn hex nut clockwise until the
switch opens.
4. Move temperature adjustment lever to
lowest setting.
5. Replace thermostat cover. Wait 10 min.
for bimetal temperature to stabilize. Do
not stand near the thermostat during this
period, as your breath and body heat will
affect bimetal temperature.
6. Move temperature adjustment lever to
correspond to actual room temperature.
Then remove thermostat cover.
7. Slip 7/32” wrench onto hex nut.
While holding temperature adjustment lever
stationary, turn hex nut counter-clockwise
until switch closes.
8. Replace thermostat cover and set
temperature adjustment lever to desired
temperature. Turn on electrical power to
system.
HEAT ANTIICIPATION ADJUSTMENT
Some heating installations require longer or
shorter “ON”, “OFF” periods to maintain even
temperatures. For average conditions, set the
heat anticipator indicator to match the current
rating of the primary heating control. Move
indicator approximately 1/2 division in direction
indicated by the arrows on the thermostat for
longer “ON” cycles, or move lever in opposite
direction for shorter “ON” cycles. Allow at least
24 hours to determine if setting provides
satisfactory operation before making any
further adjustments.
®
®
Climate Technology Corp.
Division of Sealed Unit Parts Co., Inc.
P.O. Box 21, 2230 Landmark Place, Allenwood, N.J. 08720
[phone] • Fax [phone]
www.supco.com • [e-mail]
Bimetal
7/32” Calibration wrench
Temperature
adjustment
lever
Arrow points to the matched current
rating of the primary control.
Move this lever
to adjust heat
anticipator.
43004A/43005A
Rev. 09072011