Raypak 155C User Manual download pdf (Page 23)

Fig. # 8069.1

PRESSURE SWITCH ADJUSTMENT RANGE

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.

Pool or Spa

Heat Exchanger Height

PRESSURE SWITCH

The pressure switch, or heater actuator, insures

that the heater operates only when the filter pump is in

operation. It is factory set at 1.75 PSI for deck level

installations. When the heater is located below the

level of the spa or pool, it may be necessary to reset the

pressure switch to compensate for the no-flow static

head. If it is necessary to reset the pressure switch, we

recommend the following procedure:

PRESSURE SWITCH ADJUSTMENT:

1. With pump and heater on, turn adjustment

knob (clockwise) until a click is heard from

the gas valve.

2. Turn adjustment knob (counter clockwise)

1/4" turn.

3. Turn pump off and on several times. Heater

should shut off immediately. If it does not,

repeat steps above until proper adjustment

is made.

Adjustment Knob

Heat Exchanger Height

5' Max.

TWO SPEED PUMPS

In some cases, the flow on the low-speed is insuf-

ficient 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

functionof a properly adjusted pressure switch.

HIGH LIMITS

The heater is equipped with two automatic high

limits. Set to operate at 135°F and 140°F.

NOTE: An erratic high limit is often characteristic of an

internal heat exchanger problem, i.e. scale buildup,

and U.G. operation. Refer to troubleshooting section.

Fig. # 8153.0

HIGH LIMIT REMOVAL

1. Shut off main electrical power switch to

heater.

2. Remove inspection panels.

3. Drain heater.

4. Remove defective high limit and replace with

a new high limit.

5. Reverse above procedure to re-install.

FLAME ROLL-OUT SAFETY SWITCH

The heater is equipped with a thermal cutoff device

to prevent flame roll-out in the event the heat ex-

changer becomes blocked. This is a "Single-use" type

fusible link or thermal fuse, that must be replaced when

disabled by an over temperature condition, caused by

excessive restriction in the heat exchanger flue pas-

sage.

Fig. #9177

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 33 34

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Raypak 155C User Manual Page 23

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