43
CL3
Series
3.0
Installation
•
Thermostat Connection
The thermostat terminal designations are as follows:
R:
24 VAC Power
W1:
Call for Heat - Low Fire
W2:
Call for Heat - High Fire
C:
Common for 24 VAC Power (if required for thermostat power)
24 VAC is supplied from an internal 40 VA transformer.
DO NOT
supply 24 VAC to the terminal strip.
Figure 3.30
•
Single Two-Stage Heater, Single Thermostat Connection
Controlling Multiple Heaters with a Single Control Device
Figure 3.31
•
Multiple Heaters, Single Thermostat Connection with Relay Option
120VAC Power (observe polarity)
NOTE: If optional yellow control cord is
installed then the following wire colors apply:
Neutral = green
Low = white
High = black
Three 1/4” spade
terminals required
(as supplied)
Burner Box
Additional wire needed for thermostats
that require constant power.
24VAC
N
Low
High
EXTERNAL TRANSFORMER
(field supplied)
THERMOSTAT
To 120VAC grounded outlet.
To 120VAC grounded outlet.
To 120VAC grounded outlet.
N
Burner Box
Burner Box
24VAC
120VAC
NOTE: If optional yellow
control cord is installed then
the following wire colors apply:
24VAC Out = green
Low = white
High = black
1/4” spade terminals
required (as supplied)
Burner Box
THERMOSTAT
24VAC
N
Low
High
To 120VAC
grounded outlet.
24V
When using a thermostat that requires constant power a common wire must
be run from the C terminal on the thermostat back to the transformer.
as this may cause the unit to short cycle. Care should be given to locate the thermostat away from
drafts or frequently opened doors. To prevent drafts inside the wall from affecting the thermostat’s
performance, plug hole for the wire with insulation or suitable caulk. For further information, see the
accompanying instructions with the thermostat.
