Rev. C 10-5-07 P/N 472592
11
PUMP
FILTER
POOL
HEATER
MANUAL
BY-PASS
TO
POOL
GATE
VALVE
FROM
POOL
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 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
Where the water flow rate exceeds the maximum 120 GPM, a manual
bypass should be installed and adjusted. After installing the valve, adjust
the valve to bring the flow rate within the acceptable range. Then remove
the valve handle or lock it in place to avoid tampering. See Figure 4.
Section 3. Installation
Figure 3.
Table 1.
Cool water
Warm water out
Outlet to pool
Inlet to heater
1. Set Manual By-Pass Valve.
2. Remove Handle.
See page 45 for Pressure Relief Valve Installations.
Figure 4.
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