Check the power source:
AC = 108 VAC Minimum, 132 VAC MAX
AB = 108 VAC Minimum, 132 VAC MAX
BC = <1 VAC Maximum
Check the Power Source
WARNING:
Using a multi-meter, check the
following voltages at the circuit breaker panel prior to
connecting any equipment. Make sure proper
polarity is followed and house ground is proven.
(See Fig. 13.)
Fig. 12: Wiring Connections
Fig. 13: 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. 12–20.
1. Verify that circuit breaker is properly sized by
referring to heater rating plate. A dedicated circuit
breaker should be provided and sized for the
heater and all pumps powered through the heater.
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 at the J-box inside the heater.
3. Observe proper wire colors while making electri-
cal connections. Many electronic controls are
polarity sensitive. Components damaged by im-
proper 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 should 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.
NOTE:
Current draw noted on rating plate does not
include pump current.
20
Summary of Contents for 300A
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