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1.
Indirect Pool Heater
2.
Gate valve
3.
Check valve
4.
Flow switch
5.
Thermostat or Aquastat
6.
Thermometer
7.
Drain valve
8.
Filter
Pool/Spa Pump
9.
Bypass valve
10.
Union
11.
Boiler Pump
12.
NOTE:
-
Damage to the Indirect Pool Heater due to improper water chemistry is not covered under the warranty
-
Chlorine feeder must be installed after (downstream of) the Indirect Pool Heater and be installed with an
anti-siphoning valve to prevent pool chemicals from backing up into the Indirect Pool Heater.
-
This is only a conceptual drawing. A qualified installer must determine whether this system setup
will work in each application. Installer must also ensure compliance with code requirements.
Figure 2.
Connection Diagram
On the pool-side, the flow may be variable either due to
variable-speed pumps or changes in the pressure drop
through the filtration system. These variances can be
accommodated by installing a 2 lb. spring-loaded check
valve in the bypass line along with a manual valve (see
Figure 2 for details).
On model sizes 045 to 495, the check valve will control
bypass flow by directing all flow through the exchanger
under low-flow conditions, and avoiding excessive flow
through the heat exchanger under high-flow conditions.
On 995 models the 2 lb. check valve does not provide
enough resistance to direct adequate flow through the
heat exchanger, and must be augmented by using the
manual valve to throttle flow to provide approximately 6
to 15 ft. of head across the 995 exchanger.
Controls
The Indirect Pool Heater must be installed with
temperature and flow controls to protect the heat
exchanger and control water temperature supplied to
the pool or spa. The return from the pool/spa must
be controlled at the inlet to the Indirect Pool Heater
8
Sample Installation Diagram
TO BOILER CONTROL
BOILER WATER FLOW
2
11
12
1
6
BOILER WATER FLOW
2
3
11
by a thermostat set to the desired temperature for the
pool/spa, with the maximum recommended operating
temperature of 104°F (40°C) . A second temperature
control must be installed in the outlet piping of the Indirect
Pool Heater to limit pool/spa supply temperatures to
140°F (60°C) maximum. In addition to the temperature
controls, a flow switch should be installed in the pool/
spa supply line to prove adequate flow through the heat
exchanger. All three of these controls must be satisfied
to provide a call for heat to the heat source.
Chemical feeders or salt
water generators
The pool chemical feeder or salt water generator
(with Titanium exchangers only) must be installed
after (downstream of) the Indirect Pool Heater and
be installed with an anti-siphoning valve to prevent
chemicals from backing up into the Indirect Pool Heater.
During periods of high or fluctuating chemical levels, the
Indirect Pool Heater must be isolated from the system
by closing the isolation valves, protecting the unit from
chemical damage.
CAUTION:
switch are NOT part of the Indirect Pool Heater.
These items must be supplied separately.
2
4
11
10
11
2
8
7
Operating control, high limit and flow
6
POOL WATER FLOW
3
5
POOL WATER FLOW
9
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