Raypak P-926 - Manual (Page 21)

ADJUSTMENT KNOB
Fig. # 8069.1
PRESSURE SWITCH ADJUSTMENT RANGE
HEAT EXCHANGER HEIGHT 5' Max
5' Max
Fig. # 8152.0
NOTE: If heater is installed outside of the limits shown,
a flow switch must be used in place of the pressure
switch when mounted and wired adjacent to the heater.
TWO-SPEED PUMPS
In some cases, the flow on the low speed is insuffi-
cient to operate the heater. This is apparent when the
pressure switch cannot be further adjusted or if the
heater makes banging noises. In these cases, the
pump must be run at high speed when heating the
water.
CAUTION: Do not operate the heater without the
function of a properly adjusted pressure switch.
PILOT SAFETY
The heater employs a pilot safety which closes the
main gas valve within 8/10ths of a second whenever the
pilot flame is interrupted. Pilot flame is automatically lit
when the device is powered. Unit performs its own
safety check and opens the main valve only after the
pilot is proven to be lit.
21
START-UP PROCEDURES
BEFORE START-UP
BURNERS
Clean main burners and air louvers of dust, lint and
debris. Keep heater area clear and free from com-
bustibles, flammable liquids, and chemicals. Do not
obstruct the flow of combustion and ventilating air.
WATER
Water must be flowing through the heater.
START-UP
CAUTION: Propane gas is heavier than air and sinks to
the ground. Exercise extreme care in lighting heater in
confined areas.
LIGHTING INSTRUCTIONS
1.Close all gas valves. Turn off electric power supply
wait 5 minutes.
2.Open manual pilot valve. Turn on electric power,
pilot is automatically lighted.
3.Open main gas valve.
4.Set temperature controls to desired temperature.
Fig. #8929.1
TO SHUT DOWN
Close all manual gas valves. Turn off electric power.