STA-RITE SR200NA Service Manual page 8

SECTION ONE – Heater Design and Function
Water Flow Through the Heater
Inlet
(Cold
Water)
Outlet
(Warm/
Mixed
Water)
Figure 1-6: Water Flow
1. The pool or spa circulating pump supplies water to
the heater through the I I I I n n n n l l l l e e e e t t t t .
2. Water passes to and from the heater through 2"
PVC piping to the M M M M a a a a n n n n i i i i f f f f o o o o l l l l d d d d and the M M M M a a a a n n n n i i i i f f f f o o o o l l l l d d d d
A A A A d d d d a a a a p p p p t t t t e e e e r r r r .
3. AS S S S p p p p r r r r i i i i n n n n g g g g - - - - l l l l o o o o a a a a d d d d e e e e d d d d A A A A u u u u t t t t o o o o m m m m a a a a t t t t i i i i c c c c B B B B y y y y p p p p a a a a s s s s s s s s V V V V a a a a l l l l v v v v e e e e in the
Manifold bypasses water in excess of that required
by the Heat Exchanger.
4. The M M M M a a a a n n n n i i i i f f f f o o o o l l l l d d d d A A A A d d d d a a a a p p p p t t t t e e e e r r r r distributes water to the indi-
vidual tubes of the H H H H e e e e a a a a t t t t E E E E x x x x c c c c h h h h a a a a n n n n g g g g e e e e r r r r .
5. Water is heated in the coils of the Heat Exchanger
and returned to the Manifold Adapter.
6. The T T T T h h h h e e e e r r r r m m m m a a a a l l l l R R R R e e e e g g g g u u u u l l l l a a a a t t t t o o o o r r r r 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 O O O O u u u u t t t t l l l l e e e e t t t t to the pool or spa.
1
2
3
6
7
4
5
S S S S a a a a f f f f e e e e t t t t y y y y P P P P r r r r e e e e c c c c a a a a u u u u t t t t i i i i o o o o n n n n s s s s : : : :
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.
Table 1
Maximum and Minimum Flow Rate in GPM (LPM)
Model Minimum Flow
200 20 (76 LPM)
333 33 (114 LPM)
400 40 (151 LPM)
1-6
Primary
Heating
Coils
Secondary
Heating
Coils
Maximum Flow
120 (454 LPM)
120 (454 LPM)
120 (454 LPM)