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25
ured to operate in an on-off firing mode. This
means that you will connect a single-pole control
to stage one of the CPW board. Then jumper the
remaining firing stages. For example, if your
heater is a Model 1532B, you will jumper stages
two, three and four. Then your heater will either be
on at full fire, or it will be off.
2. For 2-stage controller connections, connect each
stage of the control to the corresponding stage of
the CPW board in the heater, i.e., stage 1 of the
heater to stage 1 of the control; stage 2 of the
heater to stage 2 of the control, as shown in Fig.
22 and Fig. 25. Set the operating control to the
set-point at which you want the heater to maintain.
Ensure that the sensing bulb of the control is at the
point in the system that will best maintain the tem-
perature you want. For example, when you are
heating a tank of water, you want the operating
control sensor bulb in the tank.
3. For single-stage controller connections, attach the
stage 1 connections on heater 1 to the tankstat per
Fig. 26.
Heater must be electrically grounded in accordance
with the NEC, and CSA C22.1 C.E.C. Part 1 in
Canada.
2-STAGE
TANKSTAT
STAGE 1
CONNECTION
STAGE 2 CONNECTION OR
STAGE 1 CONNECTION
OF HEATER 2
ATTACH STAGE 1 CONNECTIONS ON HEATER
TO STAGE 1 CONNECTION ON TANKSTAT.
ATTACH STAGE 2 CONNECTIONS OR
STAGE 1 CONNECTION OF HEATER 2
TO STAGE 2 CONNECTIONON TANKSTAT
AS SHOWN IN THE DIAGRAM.
Fig. 25: 2-Stage Tankstat
SINGLE
STAGE
TANKSTAT
STAGE 1
CONNECTION
ATTACH STAGE 1 CONNECTIONS
ON HEATER TO THE SINGLE STAGE
TANKSTAT AS SHOWN IN THE DIAGRAM ABOVE.
Fig. 26: Single-Stage Tankstat
Venting
General
Flue Exhaust Tee
An optional Flue Exhaust Tee is available to facilitate
horizontal venting. Any reference to horizontal venting
that exits the back of the heater requires this tee. Refer
to Table J for the appropriate kit for your model.
Appliance Categories
Heaters are divided into four categories based on the
pressure produced in the exhaust and the likelihood of
condensate production in the vent.
Category I – A heater which operates with a non-pos-
itive vent static pressure and with a vent gas
temperature that avoids excessive condensate pro-
duction in the vent.
NOTE: For 87%-efficiency boilers, see special
instructions on page 43.
CAUTION: Proper installation of flue venting is criti-
cal for the safe and efficient operation of the heater.
Consult the wiring diagram shipped with the heater in
the instruction packet or at the end of this section. The
stage-selector terminals are for the remote tank con-
trol through the heater’s 24 VAC transformer. DO NOT
attach any voltage to the stage-selector terminals.
Before starting the heater, check to ensure proper volt-
age to the heater and pump.
NOTE: If any of the original wire supplied with the
heater must be replaced, it must be replaced with
similar sized 105°C wire or its equivalent.
Model Diameter Order Number
992B 10” 011841
1262B, 1532B 12” 011842
1802B, 2002B,
2072B
14” 011843
2342B 16” 011844
Table J: Flue Exhaust Tee Kits