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Fig. 14: Single Stage and 2-Stage Tankstat
Electrical Connections—Domestic
Hot Water
Installer action is required to electrically enable your Hi
Delta heater to operate after making the power con-
nections. You must make a connection on Terminal
Block #3 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 stage selector (Terminals 4 & 5).
Then jumper the remaining firing stages. For
example, if your heater is a 162, you will jumper
stage two. Then your heater will either be on at full
fire, or it will be off.
2. For multi-stage controller connections, connect
each stage of the control to the corresponding
stage selector terminal block in the heater. Stage
1 of the heater to stage 1 of the control. Stage 2 of
the heater to stage 2 of the control, and so on. Set
the operating control at the setpoint in which you
want the heater to maintain. Ensure that the sens-
ing bulb of the control is at the point in the system
that will best maintain the temperature you want.
For example, when you are heating a tank of
water, you want the operating control sensor bulb
in the tank.
Consult the wiring diagram shipped with the heater in
the instruction packet. The Stage 1 connections are for
the remote tank control through the heaters 24 volt
transformer. DO NOT attach line voltage to the Stage
1 connection. Before starting heater, check to ensure
proper voltage to heater and pump.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
DANGER—SHOCK HAZARD: Make sure
electrical power to the heater is disconnected to
avoid potential serious injury or damage to
components.
NOTE: Minimum 18 AWG, 105°C, stranded wire
must be used for all low voltage (less than 30 volts)
external connections to the unit. Solid conductors
should not be used because they can cause
excessive tension on contact points. Install conduit
as appropriate. All high voltage wires must be the
same size (105°C, stranded wire) as the ones on the
unit or larger.