Water Pressure Switch; Two-Speed Pump - Hayward H200FD Service & Installation Manual

9. Remove the 1/8" pipe nipple and replace the
1/8" pipe plug. If proper pressure cannot be
achieved by adjusting the gas valve regula-
tor, the installer must contact the gas sup-
plier and request that the inlet pressure to
the heater be set to within the gas pressure
range shown in Table 15.
WATER PRESSURE SWITCH TEST / ADJUSTMENT PROCEDURE:
The pressure switch is preset at the factory for most typical, deck level installations. When the heater is located
above or below the level of the pool or spa, the pressure switch may require adjustment to compensate for the change
in static head pressure. The following procedure is recommended when the switch needs adjustment and/or is replaced:
For Installations with Heater Above Water Level:
1. Be sure the filter is clean before making the adjustment.
2. Turn "ON" the filter pump and ensure all air is out of the water lines, and ensure water flow rate is at
least the rated minimum (see Table 14).
3. Turn "ON" the heater and adjust the thermostat to create a call for heat.
4. If the heater does not light, adjust the pressure switch by turning the adjustment knob on the pressure
switch counter-clockwise, until the heater lights. Turning the adjustment knob counterclockwise
decreases the pressure needed to close the switch.
5. Check the function of the pressure switch by turning the filter pump on and off several times. The pool
heater should turn off immediately when the pump is turned off. Never allow the heater to operate with
less than the minimum rated water flow rate.
For Installations with Heater Below Water Level:
1. Be sure the filter is clean before making the adjustment.
2. Turn "ON" the filter pump and ensure all air is out of the water lines, and ensure water flow rate is at
least the rated minimum (see Table 14).
3. Turn "ON" the heater and adjust the thermostat to create a call for heat.
4. Turn the adjustment knob on the pressure switch clockwise, until the heater turns off, then turn the knob
¼ turn counter-clockwise, so that the heater turns back on. Turning the adjustment knob clockwise
increases the pressure needed to close the switch.
5. Check the function of the pressure switch by turning the filter pump on and off several times. The pool
heater should turn off immediately when the pump is turned off. Never allow the heater to operate with
less than the minimum rated water flow rate.

TWO-SPEED PUMP:

In a few cases the pressure from a two-speed pump is below the 1- pound minimum required to operate the wa-
ter pressure switch on the heater. This is apparent when the pressure switch cannot be further adjusted. In these cases
the pump must be run at high speed to operate the heater. If the pump and piping arrangement are such that the re-
quired 1-pound minimum pressure cannot be obtained, do not attempt to operate the heater. Correct the installation.
WARNING EXPLOSION HAZARD: Gas pressures in excess of those listed in
Fig. 33 could cause a gas leak or diaphragm rupture. Gas leakage could cause an
explosion resulting in severe injury or death.
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Table 15: Correct gas pressures
Pressure, in. w.c.
Fuel
1.8" - 2.0" w.c. 6.8" - 7.0" w.c.
Manifold
Inlet, minimum
10.5" w.c.
Inlet, maximum
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
FDN FDP
Natural Propane
4.5" w.c. 9.0" w.c.
13.0" w.c.
www.haywardpool.com
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