Water Connections - Pentair MASTERTEMP 200HD Installation And User Manual

Section 1. Installation
14

WATER CONNECTIONS

3-Way
Chlorinator
The heater requires proper water flow and pressure for its Valve
operation. See Figure 6 for the recommended installation.
The filter pump discharges to the filter, the filter discharges
Check Valve
to the heater, and the heater discharges directly to the pool
or spa.
A manual bypass valve should be installed across the heater
Heater
when the pump flow exceeds 454 LPM (120 GPM). See
Main
Filter
"WATER FLOW RATE" Table 1 on page 12 for setting of
Drain
the manual by-pass valve.
Spa
Pool
Make sure that the outlet plumbing from the heater contains
Pump
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
From Pool 3-Way
3-Way
Valve
Valve
the heater unless it is below the level of the pool or spa.
Figure 6.
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 50 mm 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.
Local codes may require the installation of a pressure relief valve (PRV), see page 56 for "PRESSURE RELIEF
VALVE" instructions..
MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020