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10 | Section
2. Installation
WATER CONNECTIONS
The heater requires proper water flow and pressure for its
operation. See Figure 12 for the recommended installation.
The filter pump discharges to the filter, the filter discharges to
the heater, and the heater discharges directly to the pool or
spa.
A manual bypass valve should be installed across the heater
when the pump flow exceeds 454 L/m (120 GPM). See
"WATER FLOW RATE" on page 9 - Table 1 for setting of
the manual by-pass valve.
Make sure that the outlet plumbing from the heater contains
no shut-off valves or other flow restrictions that could prevent
flow through the heater (except for below pool as noted below,
or winterizing valves where needed). To switch flow between
the pool and spa, use a diverter valve. Do not use any valve
that can shut off the flow. Do not use a shut-off valve to
isolate the heater unless it is below the level of the pool or spa.
Install the chemical feeder downstream of the heater. Install
a chemical resistant one-way check valve between the heater and the chemical feeder to prevent back-siphoning through
the heater when the pump is off.
NOTICE: If the heater is plumbed in backwards, it will cycle continuously. Make sure piping from filter is not reversed
when installing heater.
Connect the heater directly to 63 mm (2 in - UK) PVC pipe, using the integral unions provided. Heat sinks are not
required. The low thermal mass of the heater will prevent overheating of the piping connected to the pump even if the
heater shuts down unexpectedly. Occasionally a two-speed pump will not develop enough pressure on the low speed to
operate the heater. In this case, run the pump at high speed only to operate the heater. If this does not solve the problem, do
not try to run the heater. Instead, correct the installation.
Do not operate the heater while an automatic pool cleaner is also operating. If the circulation pump suction is plugged (for
example by leaves), there may not be adequate flow to the heater. Do not rely on the pressure switch in this case.
If European Standard Codes of Practice require the installation of a pressure relief valve (PRV), see page 33 for
"PRESSURE RELIEF VALVE INSTRUCTIONS".
BELOW POOL INSTALLATION
If the heater is below water level, the pressure switch must be adjusted. This adjustment must be done by a qualified
service technician.
See following CAUTION before installation.
The Water Pressure Relief Valve Switch is set in the factory at 0.20 bar (3.00 psi). This setting is for a heater installed at pool
level. If the heater is to be installed more than 0.3 m above or below, the water pressure switch must be adjusted by a
qualified service technician. See page 33, Figure 32.
If the heater is installed more than 1.5 m above the pool or more than 1.2 m below the pool level, you will be beyond the
limits of the pressure switch and a flow switch must be installed. Locate and install the flow switch externally on the outlet
piping from the heater, as close as possible to the heater. Connect the flow switch wires in place of the water pressure
switch wires.
™
MASTERTEMP
Pool and Spa Heater Installation and User's Guide
All manuals and user guides at all-guides.com
CAUTION
BELOW OR ABOVE POOL INSTALLATION
FLOW SWITCH INSTALLATION
Main
Drain
Pool
From Pool
3-Way
Valve
3-Way
Chlorinator
Valve
Check Valve
Heater
Filter
Spa
Pump
3-Way
Valve
Figure 12.
P/N 475106 Rev. D 1/2016
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