Below Pool Installation - Pentair MASTERTEMP 125 Installation And User Manual

VALVES
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
Model Min. (GPM) (LPM) Max. (GPM) (LPM) *
125 20 (76)
* Do not exceed the maximum recommended flow
rate for the connecting piping.
Table 1.
See page 34 for Pressure Relief Valve Installations.

BELOW POOL INSTALLATION

The water pressure switch is set in the factory at 3.00 PSI (± 0.75 PSI). This setting is for a heater installed at pool level.
If the heater is to be installed more than 1' above or below, the water pressure switch must be adjusted by a qualified
service technician. See page 34, Figure 29.
If the heater is installed more than 5' above the pool or more than 4' 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.
Rev. B 8/14
CAUTION
70 (265)
CAUTION
BELOW OR ABOVE POOL INSTALLATION
FLOW SWITCH
MASTERTEMP
Section 3. Installation Instructions
1. Set Manual By-Pass Valve.
2. Remove Handle.
® 125 Pool and Spa Heater Installation and User's Guide
13
Warm water out
Cool water in
INLET FROM HEATER
OUTLET TO POOL
Figure 5.