Honeywell CT62A - Manual (Page 3)

Symptom Checkout Action
No heat. Make sure power is on at
main service panel. Turn
the temperature setting
knob fully clockwise . Heater should start to warm up within two minutes. If not,
contact qualified electrician to check thermostat and heater.
Improper connections to
thermostat. With power to circuit OFF, tighten all wiring connections. Repair
any frayed or broken wires.
Other. Contact a qualified electrician for assistance.
Heater never turns
off. Turn temperature setting
knob fully
counterclockwise . Heater should start to cool within minutes. If not, turn off power
at the main service panel, and contact qualified electrician.
Thermostat setting
and thermometer
reading disagree. Thermostat affected by
drafts or radiant heat. Contact electrician to change the location. The thermostat
should be about 5 ft (1.5m) above the floor and on an inside
wall.
Thermometer is out of
calibration. Recalibrate. See step 8.
3 69-0829—1
Check Calibration
Turn the setting knob clockwise until the switch
makes (clicking sound). The heating equipment and
fan start.
No recalibration is necessary if the thermostat switch
makes with the thermostat setting at the same
temperature as indicated on the thermometer.
If the thermostat setting differs from the thermom-
eter, record the temperature difference and
recalibrate as instructed in the Recalibration Procedure
section.
Recalibration Procedure
Note the temperature difference between the
temperature setting and the thermometer.
Remove the thermostat cover.
Rotate setting knob clockwise until you hear
switch click.
Hold the setting knob firmly and rotate the set point
scale ring counterclockwise
until the
12 o'clock position of the ring agrees with the cover
thermometer.
7
TROUBLESHOOTING
Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following:
8
CALIBRATION
The CT62 Thermostats are calibrated at the factory using
precise instruments under closely controlled conditions.
Recalibration should not be necessary. Allow the thermo-
stat to operate for several hours before checking the
calibration. The CT62 Thermostat vapor-filled dual
diaphragm sensing element is affected by barometric
pressure and altitude. Temperature deviations of 1
°
F
(0.5
°
C) are normal. If the thermostat is mounted in a
suitable location and still appears out of calibration, check
calibration as follows:
M5796
THERMOSTAT
BASE
SETTING KNOB
AT 12 O'CLOCK
POSITION
SETTING KNOB
SCALE RING
80
75
70 65
60
55
50
The heat from your hand will affect the diaphragm
sensor. Replace thermostat cover, wait five minutes
and recheck calibration.