5
ENVISION POOL HEATER INSTALLATION MANUAL
Water Flow and Connections
Water connections are made at the rear of the heater.
Both water in and out are labeled just above the water
connections. LEFT REAR = WATER OUT and RIGHT REAR
= WATER IN. Two in. unions are supplied and are made to
accept 2 in. rigid PVC pipe. NOTE: Unions can be used for
quick drainage of your heater and winterizing.
Heater must be piped downstream from filter in the pool •
return line.
In-line chlorinators must be piped downstream from •
heater. A check valve must be installed between the
heater and chlorinator to prevent drain back of the
chlorine when the pump is off. A chemical trap may
also be piped at least 6 in. above the height of the
chlorinator.
When all the plumbing connections are complete, and •
ample drying time is allowed, run the filter pump and
check the entire system for water leaks.
Make sure filter is clean and there are no obstructions in •
the filtering system.
Proper water flow is essential to the performance of your •
heater. The minimum flow rate is 20 gpm.
Pool
Spa
Auto-
Chlor
Pump
3-Way
Valve
External
Pressure Switch
Filter
Gas
Trap
3-Way
Valve
Heat Pump
Pool Heater
Return
Automatic
Chlorinator
From Main Drain/Skimmer
Check Valve
Chlorine
Gas Trap
Ball Valves
Filter
Pump
In Out
Heat Pump
Pool Heater
Heat Pump
Pool Heater
In Out
Pump
Filter
From Main Drain/Skimmer
Return
Ball Valve - For Flow Rates
Greater than 70 gpm or
Pumps Larger than 1.5 H.P.
Typical Installation
Installation with In-line Chlorinator
Installation with Pool and Spa
Chemical Use
Water quality must be checked regularly and maintained
within recommended limits at all times. Failure to maintain
the proper water quality will greatly reduce the life of your
heater.
Never add chemicals directly into skimmer.•
Automatic chlorinators must be piped downstream from •
the heater. A check valve must be installed between
the chlorinator and heater to prevent raw chlorine from
draining back into the heater. A chemical trap may be
piped at least 6 in. above the chlorinator. See Installation
with In-line Chlorinator diagram above.
The heat exchanger in your heat pump contains a titanium
inner tube with a PVC outer shell that will withstand almost
any water chemistry. While the heat exchanger provides
superior protection against poor water chemistry, it is
important to maintain adequate water quality to help
preserve other components in the system such as pumps
and filters. The following water quality guidelines are listed
below.
pH Level 7.4 – 7.8•
Chlorine Concentration 1 – 5 ppm•
Total Alkalinity 100 – 200 ppm•
Calcium Hardness 100 – 300 ppm•
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