User Guide

F-20044-2 © Copyright 2006 TAC All Rights Reserved. 3
CHECKOUT
1. With power on, check fan speed by placing switch in low,
medium and high positions.
2. To observe action of controlled devices:
• Place fan switch in low, medium or high position.
• Turn the setpoint dial to temperature above ambient;
thermostat will switch, closing the Brown (heating)
contact.
• Slowly turning the setpoint dial to a lower temperature
setting will first break the Brown (heating) contact. The
contact blade will be in a neutral position between the two
contacts (not making a circuit to either contact). Turning
the setpoint dial to a lower temperature setting will cause
the thermostat to switch, closing the Red (Cooling)
contact.
CALIBRATION
THERMOSTATS ARE CALIBRATED AT THE FACTORY
AND DO NOT REQUIRE JOB SITE CALIBRATION.
Allow two days for systems and wall temperature to stabilize
before considering recalibration as follows: (See Figure 3 for
part identification).
1. Disconnect power to thermostat.
2. Turn the setpoint dial 2°F (1°C) above the actual room
temperature, as read from an accurate thermometer.
3. Place fan switch in “off” position. Remove thermostat
cover and insulator screw, swing insulator aside, and
remove contact cover.
Note: Do not breathe on the thermostat or handle
excessively as this will affect the accuracy of the final
calibration.
4. If contact blade is made to the left Brown contact, use a
3/16" open end wrench TOOL-11 and turn calibration
screw counterclockwise (looking at head of screw) until
blade floats between contacts.
Note: Each complete turn of screw changes calibration
approximately 20°F (11°C).
5. Now turn screw very slowly clockwise until blade just
makes the left Brown contact. Thermostat is now properly
calibrated.
6. If contact blade is originally made to the right Red contact
or floating between contacts, turn calibration screw slowly
clockwise until element just makes the left Brown contact.
Thermostat is now properly calibrated.
7. With fan switch in “off” position, replace contact cover,
insulator and thermostat cover.
8. Connect power to thermostats.
9. Turn setpoint dial to required temperature and place fan
switch in desired position.
Figure-3 Part Identification.
MAINTENANCE
This is a quality product. Regular maintenance of the total
system is recommended to assure sustained optimum
performance. No routine servicing of this device is required if
the system is properly maintained.
Open areas at bottom and around base of the thermostat
should be kept clean and free from obstructions to allow
proper flow of air. If switch contacts need cleaning, this may
be done with a burnishing tool.
Note: Thermostat may require calibration after contact
cleaning.
REPAIR
No field repair is possible. Replace thermostat with a
functioning unit.
Note: Normally closed cooling valve required for proper
system operation.
Figure-4 Typical Sequenced Heating & Cooling Anticipation
(no changeover thermostat required).