User Guide

ManualsBrandsBarber Colman ManualsElectric Duplex Room ThermostatsSPDT Electric Thermostat w/ 400 & 404 Inserts (75-105F)

CALIBRATION (See Figure 3)

All thermostats are precision calibrated at the factory and

normally will not require any further attention. However, if

recalibration is necessary, proceed as follows:

1. Turn off control power and power to night depression circuit,

where applicable.

2. Set setpoint dial to correspond to actual stable room

temperature, as read from an accurate thermometer.

3. Remove thermostat cover. Do not breathe on the thermostat

or handle excessively as this will affect the accuracy of the

final calibration.

4. If contact blade is the made to left (red) contact, with a small

screwdriver, turn calibration screw counterclockwise (looking

at head of screw) until blade makes to right (brown) contact.

Note:

Each complete turn of screw changes calibration

approximately 15°F (8°C).

Now turn screw very slowly clockwise until blade just makes

the left (red) contact. Thermostat is now properly calibrated.

If contact blade is originally made to the right (brown) contact,

turn calibration screw slowly clockwise until element just

makes the left (red) contact. Thermostat is now properly cali-

brated.

5. Replace thermostat cover.

6. Connect power to thermostat.

7. Recheck calibration about 30 minutes later to be sure heat

from handling of or breathing on bimetal element did not result

in an erroneous setting.

Figure-3

HEAT ANTICIPATION (See Figures 7 and 8)

Parallel heat anticipation is recommended for :

• Systems with excess heating capacity that can cause

objectionable space temperature swings.

• Thermostats mounted on walls (i.e., concrete) that change

temperature slowly and/or have insufficient air flow over the

device.

COOLING ANTICIPATION (See Figure 8)

Parallel cooling anticipation is recommended for:

• Cooling anticipations where current draw exceeds 1 ampere.

Cooling lockout (self heat of the thermostat causing over

cooling of the space) can occur on these applications.

• Systems with excess cooling capacity that can cause

objectionable space temperature swings.

• Thermostats mounted on walls (i.e., concrete) that change

temperature slowly and/or have restricted air flow over the

device.

CONCEALED CONTROL DIAL

Knurled Dial Removal (See Figure 4)

1. Remove thermostat cover.

2. Secure the control dial with hand so that the dial will not rotate.

3. Place needle nose pliers at knurled ring of the control dial at

the points where the knurled ring is attached to the control

dial.

4. Twist the pliers at each knurled ring attachment point until the

entire knurled ring of the control dial is removed.

Figure-4 Knurled Dial Removal.

LIMIT CONTROL DIAL RANGE

Dial Stop Pin Insertion (See Figure 5)

1. Remove thermostat cover.

2. Secure the control dial with hand so that the dial will not rotate.

3. Place a dial stop pin in the jaws of a needle nose pliers.

4. Insert the dial stop pin in the appropriate hold on either (or

both) side(s) of the control dial to restrict dial rotation.