Installer action is required to electrically enable your heater to operate after making the power connections. You must make a closed contact connection on Stage 1 connector of the Central Point Wiring (CPW) board for temperature control connections. This will be done based on the controller option selected with your heater order.
1.For Pool and Closed-Loop Water-Source Heat Pump applications, your heater should be config- 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 902B, 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. 21 and 22. 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. 23.
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 | | | | | STAGE 2 CONNECTION OR |
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| | | | STAGE 1 CONNECTION |
CONNECTION | | | | |
| | | | OF HEATER 2 |
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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. 22: 2-Stage Tankstat
