Raypak RAYTHERM P-926 - Manual (Page 10)

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.
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 models.
10
Water Connections
Location
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 tempera-
ture plastic pipe (CPVC) may be connected directly
into the heater Models 926-1223, if local codes permit
and if controls operate the pump for at least fifteen
minutes after the heater is turned off.
When local codes permit the use of less than four feet
high temperature piping or two elbows, provisions
should be made to always shut the heater off a mini-
mum of 15 minutes prior to pump shut down in order
to carry away residual heat and prevent damage to the
low temperature piping. A fireman switch included in
CAUTION (Models 926-1223): 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
NOTE: (Models 926-1223): 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.
NOTE: Flow switch will not operate if flow is less
than:
Models 926-1223 60 gpm
Models 1287-1826 85 gpm
Models 2100-4001 180 gpm
Fig. 9: Flow Switch