Water Connections; Controls; Flow Switch - Raypak raytherm p-1826 Installation & Operating Instructions Manual

Water Connections

Location
Models 926-1223 With UG
The heater requires water flow and positive pressure
to fire and operate properly. It must therefore be
installed downstream of the discharge side of the filter
pump. A typical installation is plumbed as follows:
1. The inlet side of the filter is plumbed directly to the
discharge side of the filter pump;
2. The outlet side of the filter is then plumbed to the
inlet of the heater; and
3. The outlet of the heater is plumbed to the return
line to the pool or spa. The pump, filter and heater
are thus plumbed in series.
Heater must be located so that any water leaks will not
damage the structure of adjacent area. High-
temperature plastic pipe (CPVC) may be connected
directly into the heater, if local codes permit and if
controls operate the pump for at least fifteen minutes
after the heater is turned off.
CAUTION: NEVER install PVC directly into heater.
Four feet of copper or high temperature pipe and
two elbows are required between the heater and the
PVC connections. See Fig. 8 below.
Fig. 8: Plumbing
When local codes permit the use of less than four feet
of high-temperature piping or two elbows, provisions
should be made to always shut the heater off a min-
imum of 15 minutes prior to pump shutdown in order
to carry away residual heat and prevent damage to
the low temperature piping. A fireman switch included
in the time clock may be used for this purpose with
instructions not to override this sequence manually.
See wiring diagram section for electrical hookup loca-
tion of the fireman switch in the electrical circuit.
NOTE: If piping is used into the heater, this piping
(copper) must be anchored or screwed into the
flange (metal) if operating pressures above 30 PSI
are encountered.
All Models With H-Bypass or CWR
These heaters must be installed using primary/sec-
ondary piping. For multiple-heater installations, use
reverse-return logic to ensure equal duty cycles. Flow
in the main line must be at least 120% of the heater
flow. See pages 16-17.

CONTROLS

Flow Switch

This dual purpose control shuts off the boiler in the
case of a pump failure or low water condition. It is
mounted and wired in series to the main gas valve.
Standard on all units except on UG models.
NOTE: Flow switch will not operate if flow is less
than:
Models 926-1223
Models 1287-1826
Models 2100-4001
Fig. 9: Flow Switch
10
60 gpm
85 gpm
180 gpm