Electrical Connections - Pentair MASTERTEMP 125 Guía De Instalación Y Usuario

Section 3. Installation Instructions
28

ELECTRICAL CONNECTIONS

Electrical Rating: 60 Hz 120 / 240 Volts AC, single phase
Enclose the incoming AC power line to the heater, in an approved flexible conduit connected directly to the junction box
on the inside of the access door panel. Line voltage field wiring should be 14 gauge, with a circuit capacity of 15 Amps.
This heater is designed to operate at 120 or 240 VAC. It is not recommended to be connected to OR operate on a 208 VAC.
• Before making any electrical connections to the power supply, remove the access door panels,
open the control box and plug in the correct plug (120 volt or 240 volt).
All heaters ship from the Factory with a 240V plug installed (exception: MasterTemp 125 heaters are pre-corded heaters
that ship from the Factory with a 120V plug installed). Installing the 120V plug and then connecting the heater to 240V
line current will immediately destroy the transformer, control board and ignition control module, and will void warranty.
If you install the 240V plug and connect the heater to 120 volts line current, the heater will not operate.
• If any of the original wiring supplied with this heater must be replaced, installer must supply (No. 18 AWG, 600V, 105° C. UL
approved AWM low energy stranded) copper wire or it's equivalent.
Please read the boxes headed "IMPORTANT! READ ME FIRST!" on
1. All wiring must be in accordance with all applicable codes.
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 Code or the Canadian Electrical Code (as applicable). A bonding lug is
provided on the outside of the panel under the vent for this purpose.
3. Electrical power circuits to the pool heater must follow local codes and National Electrical Code or Canadian Electrical
Code (as applicable).
4. All wiring between the heater and devices not attached to it, or between separate devices which are installed in the
field, must be "Type T" wire rated for 35°C rise.
5. All line voltage wiring shall be enclosed in approved flexible conduit, and shall be securely attached to the field
wiring box located inside the access door panel. The conduit or cable connector at the field wiring box should contain
an insulating bushing or its equivalent to prevent abrasion of the wires as they enter the box.
6. The filter pump should run continuously when the heater is on,
and for at least 5 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.
7. Do not wire single-pole switches, including protective devices, into a
grounded line. The heater is not sensitive to polarity.
Connect the L1 of the power supply to the black wire, the L2 or neutral
lead to the red wire, and the ground wire to the green wire. A time clock
controlling the filter pump should have a low-voltage Fireman's Switch
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
CAUTION
NOTE
CAUTION
AC Plug
120 Volt
240 Volt
pages 37
and 45 before proceeding.
or
Figure 21
Rev. C 3/2019