MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
12
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
PLUMBING CONNECTIONS
The MasterTemp heater has the unique capability of direct
PVC plumbing connections. A set of bulkhead ttings is
included with the MasterTemp 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.
VALVES
When any equipment is located below the surface of the pool or spa, valves should be placed in the circulation piping
system to isolate the equipment from the pool or spa. Check valves are recommended to prevent back-siphoning. Back-
siphoning is most likely to occur when the pump stops, creating a pressure-suction differential. Do NOT sanitize the
pool by putting chlorine tablets or sticks into the skimmer(s). When the pump is off, this will cause a high concentration
of chlorine to enter the heater, which could cause corrosion damage to the heat exchanger.
CAUTION
Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater, filters or
pump. When chemical feeders are installed in the circulation of the piping system, make sure the feeder outlet line is
down stream of the heater, and is equipped with a positive seal noncorrosive “Check Valve”, (P/N R172288), between
the feeder and heater.
MANUAL BY-PASS ( WATER FLOW RATE)
Where the water ow rate exceeds the maximum 454 LPM, a manual
bypass should be installed and adjusted. After installing the valve, adjust
the valve to bring the ow rate within the acceptable range. Then remove
the valve handle or lock it in place to avoid tampering. See Figure 4.
Table 1.
Cool water in
Warm water out
Outlet to pool
Inlet to heater
1. Set Manual By-Pass Valve.
2. Remove Handle.
See page 56 for Pressure Relief Valve Installation.
Model Min. (LPM) Max. (LPM) *
200 160 454
300 200 454
400 240 454
* DO NOT EXCEED THE MAXIMUM RECOMMENDED FLOW RATE FOR THE
CONNECTING PIPING.
Figure 3.
Figure 4.
Section 1. Installation
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