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CTH3-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
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10.4.9 Potentiometer Control Device
Potentiometer (10K Ohm"Linear Taper") device offers
manual control over heater(s) firing rate. This type of
potentiometer can be found at Radio Shack
®
.
Potentiometer dial position directly dictates heater(s)
firing rate. Dial positions range between "Min" and
"Max". Minimum and maximum heater firing rates
(inputs) are marked on the heater's rating plate. ON/
OFF switch or thermostat is used to disable heater
operation or reset heater from lockou t.
FIGURE 28: Potentiometer Control Wiring Diagram
*OPTIONAL
SWITCH
SATELLITE HEATER CONTROL
J10 JUMPER POSITION
SHOWS "SATELLITE" DESIGNATION.
MODULATION CONTROL WIRING
TO ADDITIONAL SATELLITE
HEATER CONTROL TERMINALS
T28 AND T29.
MODULATION CONTROL WIRING
TO SATELLITE HEATERS
CENTRAL HEATER CONTROL
J10
W
R
-+
-
+
-+
OUT
RATE
FIRING
IN
RATE
FIRING
EXT. POT
GND
WIPER
HIGH
GND
BAR
SLIDE
GND
THERMISTOR
INPUT
ANALOG
THERMOSTAT
T31
T29
T19
T18
T16
T14
T27
T25
T30
T28
T17
T15
T13
T26
T24
J10
W
R
-+
-
+
-+
OUT
RATE
FIRING
IN
RATE
FIRING
EXT. POT
GND
WIPER
HIGH
GND
BAR
SLIDE
GND
THERMISTOR
INPUT
ANALOG
THERMOSTAT
T31
T29
T19
T18
T16
T14
T27
T25
T30
T28
T17
T15
T13
T26
T24
ON/OFF SWITCH
or THERMOSTAT
A B
A B
J10 JUMPER POSITION
SHOWS "CENTRAL"
DESIGNATION AND
"POTENTIOMETER"
CONTROL METHOD.
POTENTIOMETER
(10K Ohm)
* Separate on/off switch is optional for "satellite" heaters (install at user level).
On/Off switch is used to disable heater operation or reset a heater that is in "lockout" mode.
If on/off switch is not desired, leave jumper wire between R and W terminals in place.