27
WARNING:
Using a multi-meter, check the
following voltages at the terminal block inside the
unit. Make sure proper polarity is followed and house
ground is proven. (See Fig. 20.)
CIRCUIT
BREAKER
WHITE
GROUND
BLACK
GREEN
A B C
Fig. 29: Wiring Connections
Check the power source:
AC = 108 VAC Minimum, 132 VAC MAX
AB = 108 VAC Minimum, 132 VAC MAX
BC = less than 1 VAC Maximum
Fig. 30: Multi-meter
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.
Making the Electrical Connections
Refer to Fig. 27-31.
1. Verify that circuit breaker is properly sized by
referring to heater rating plate. A dedicated circuit
breaker should be provided.
2. Turn off all power to the heater. Verify that power
has been turned off by testing with a multi-meter
prior to working with any electrical connections or
components.
3. Observe proper wire colors while making electri-
cal connections. Many electronic controls are
polarity sensitive. Components damaged by
improper electrical installation are not covered by
warranty.
4. Provide overload protection and a disconnect
means for equipment serviceability as required by
local and state code.
5. Install heater controls, thermostats, or building
management systems in accordance with the
applicable manufacturers’ instructions.
6. Conduit shall not be used as the earth ground.
NOTE:
A grounding electrode conductor shall be
used to connect the equipment grounding
conductors, the equipment enclosures, and the
grounded service conductor to the grounding
electrode.
shipped with the heater in the instruction packet.
Before starting the heater check to ensure proper volt-
age to the heater and pump.
Install a separate disconnect means for each load.
Use appropriately sized wire as defined by NEC, CSA
and/or local code. All primary wiring should be at least
125% of minimum rating.
If any of the original wire as supplied with the heater
must be replaced, it must be replaced with 105°C wire
or its equivalent.
Check the Power Source
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