MASTERTEMP Pool and Spa Heater Installation and User’s Guide Rev. N 10/2018
12
PLUMBING CONNECTIONS
The MasterTemp heater has the unique capability of direct
schedule 40 PVC plumbing connections. A set of bulkhead
fittings is included with the MasterTemp heater to insure
conformity with Pentair’s recommended PVC plumbing
procedure. Other plumbing connections can be used. See
Figure 3 for plumbing connections.
CAUTION
Before operating the heater on a new installation, turn
on the circulation pump and bleed all the air from the
filter using the air relief valve on top of the filter. Water
should flow freely through the heater. Do not operate
the heater unless water in the pool/spa is at the proper
level. If a manual by-pass is installed, temporarily close it
to insure that all air is purged from the heater.
WATER CONNECTIONS
The heater requires proper water flow and pressure for its
operation. See Figure 5 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 120 GPM (454 LPM). See
“WATER FLOW RATE” on page 13- 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 pool installations as noted
below, or winterizing valves where needed). T
o switch flow
between the pool and spa, use a diverter valve. Do not use
any valve that can shut off the flow.
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 2" 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.
Pool
Main
Drain
Spa
From Pool
3-Way
Valve
3-Way
Valve
3-Way
Valve
Chlorinator
Heater
Pump
Check Valve
Filter
Figure 5.
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
Section 3. Installation Instructions
Figure 3.
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