12
Raypak recommends the installation of an air bleed
vent at a suitable location (usually the highest point in
the plumbing) to remove air from the piping system.
These units should be available at your local whole-
sale supplier. Raypak does not provide this item.
Models with H-bypass are equipped with an external
pump and bypass arrangement that blends outlet
water with the inlet to increase the inlet water tempera-
ture, thereby reducing the likelihood of condensation
forming on the heat exchanger. The pump also serves
to circulate water through the heater from the main
system piping. Adjust the bypass to maintain 105ºF
inlet.
To complete the installation of the pool heater, the
poolstat needs to be installed in the main return water
line. This will ensure that the heater will be energized
at the right time. If the main water line is too far away
from the heater and the capillary bulb will not reach it,
locate the poolstat adjacent to the main line and run
wires back to the heater. Follow the instructions listed
below to install the poolstat.
Mounting the Poolstat Control
with Front-Mounted Loop
Using Mounting Slots
For heater models:
1287, 1336, 1414, 1468, 1571, 1631, 1758, 1826,
2100, 2500, 3001, 3500, 4001.
1. Remove the poolstat control cover by removing
the two cover screws at the top. See Fig. 13 & 14.
CAUTION: Power to the heater should be
interlocked with the main system pump to make
sure the heater does not fire without the main
system pump in operation. Improper flow control can
damage the heater. Uncontrolled flow (too high) or
restricted flow (too low) can seriously affect heater
operation. Follow these instructions to make sure
your heater is properly installed.
NOTE: For more detail on piping, refer to the
diagrams on pages 15, 16 & 17.
Fig. 11: Companion Flange Connections
(Models 926/962–1287/1336 with H-Bypass)
Slip
Valve
3"
Outlet
3"
Inlet
2 H.P.
Inlet/Outlet
Header
Fig. 12: Companion Flange Connections
(Models 2100–4001)
Model No.
Connection
Size
Minimum
gpm
Maximum
gpm
926–1223
with UG
2” FPT 60 100
1287–1826 2-1/2” FPT
Refer to Table D
2100–4001 3” FPT
Table C: Water Connections
Model No.
Loop* Flow Rates
(gpm)
Heater Flow
Rates (gpm)
1287/1336 30–50 85
1414/1468 35–55 85
1571/1631 40–65 85
1758/1826 45–70 85
2100 50–80 180
2500 60–95 180
3001 75–115 180
3500 90–135 180
4001 100–150 180
Table D: Flow Rates
*Loop is secondary piping to heater from main system.
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