SECTION ONE – Heater Design and Function
1. The pool or spa circulating pump supplies water to
the heater through the IIIInnnnlllleeeetttt.
2. Water passes to and from the heater through 2”
PVC piping to the MMMMaaaannnniiiiffffoooolllldddd and the MMMMaaaannnniiiiffffoooolllldddd
AAAAddddaaaapppptttteeeerrrr.
3. ASSSSpppprrrriiiinnnngggg----llllooooaaaaddddeeeedddd AAAAuuuuttttoooommmmaaaattttiiiicccc BBBByyyyppppaaaassssssss VVVVaaaallllvvvveeee in the
Manifold bypasses water in excess of that required
by the Heat Exchanger.
4. The MMMMaaaannnniiiiffffoooolllldddd AAAAddddaaaapppptttteeeerrrr distributes water to the indi-
vidual tubes of the HHHHeeeeaaaatttt EEEExxxxcccchhhhaaaannnnggggeeeerrrr.
5. Water is heated in the coils of the Heat Exchanger
and returned to the Manifold Adapter.
6. The TTTThhhheeeerrrrmmmmaaaallll RRRReeeegggguuuullllaaaattttoooorrrr controls the flow of water
out of the Heat Exchanger to maintain a water out-
let temperature above 120˚ F (49° C).
7. The water flows from the OOOOuuuuttttlllleeeetttt to the pool or spa.
1-6
1
3
5
6
7
4
2
Primary
Heating
Coils
Secondary
Heating
Coils
Inlet
(Cold
Water)
Outlet
(Warm/
Mixed
Water)
Water Flow Through the Heater
Figure 1-6: Water Flow
Table 1
SSSSaaaaffffeeeettttyyyy PPPPrrrreeeeccccaaaauuuuttttiiiioooonnnnssss::::
Risk of heater damage and flooding.
Do not attempt to operate heater unless water flow
through heater is within prescribed limits. See Table 1,
“Maximum and Minimum Flow Rates in GPM” below.
Heater installed above pool/spa water level should
have no flow restricting or shutoff valves in system.
Heaters installed below pool/spa water level should
have isolation valves to allow servicing.
Maximum and Minimum Flow Rate in GPM (LPM)
Model
Minimum Flow
Maximum Flow
200
20 (76 LPM)
120 (454 LPM)
333
33 (114 LPM)
120 (454 LPM)
400
40 (151 LPM)
120 (454 LPM)
