MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
32
ELECTRICAL CONNECTIONS
Electrical Rating 50 Hz 240 Volts AC, single phase; 12 AMP inrush, 5 AMP steady state. The heater is
supplied with a 240 VAC, 10 AMP, 50 Hz power cord (AS/NZS 3112) approved for outdoor use. The power cord
wire is 3 x 16 AWG (3 x 10 mm
2
). Enclose the incoming AC power line to the heater in an approved exible con-
duit connected directly to the junction box on the inside of the access door panel. Note: The heater operating
AMP draw is 2.5 AMPS at 240 VAC. A 15 AMP circuit capacity is required for the inrush current at startup.
CAUTION
This heater is designed to operate at 230 - 240 VAC. It is not recommended to be connected to OR operate on a 208 VAC.
NOTE
• If any of the original wiring supplied with this heater must be replaced, installer must supply (No. 18 AWG, 600V, 105° C. U.L.
approved AWM low energy stranded) copper wire or it’s equivalent.
Please read the boxes headed “IMPORTANT! READ ME FIRST!”
on pages 48 before proceeding.
1. All wiring must be in accordance with all applicable codes
and must be wired by a licensed electrician to AS3000 Wiring
rules.
2. The heater, when installed, must be electrically grounded and
bonded in accordance with local codes or, in the absence of local
codes, with the National Electrical Standards. A bonding lug
is provided on the outside of the panel under the vent for this
purpose. IMPORTANT NOTICE: FOR HEATER BONDING,
see page 33.
3. Electrical power circuits to the pool heater must follow local
codes and National Electrical Standards. Note: The heater will
not ignite if the active and neutral wires are reversed. Check
the power point with an approved device. If required, have
an electrician correct the wiring.
4. All wiring between the heater and devices not attached to it, or
between separate devices which are installed in the eld, must
be “Type T” wire rated for 35°C rise.
5. The lter pump should run continuously when the heater
is on, and for at least 15 minutes after the heater turns off. Any switches in the pump circuit (including circuit
breakers) that can disconnect the pump must also disconnect the heater.
6. Do not wire single-pole switches, including protective devices, into a grounded line. The heater is not sensitive to
polarity.
Use the provided waterproof wire nuts when connecting the power supply.
A time clock controlling the lter pump should have a low-voltage Fireman’s Switch that switches off the heater at least
15 minutes before shutting off the pump. Note: If the filter pump is turned OFF while the heater is running,
the residual heat will likely cause the inlet water to be a high temperature.
Figure 29.
Section 1. Installation
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