Raypak 405B Operations Instructions download pdf (Page 34)

FLAME ROLL-OUT SAFETY SWITCH

Atmospheric heaters are equipped with a thermal cutoff

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

exchanger 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 passage.

HIGH LIMITS

The heater is equipped with two automatic high limits.

Both are located in the inlet/outlet header. Both are set

to open at 135°F.

NOTE: An erratic high limit is often characteristic of

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

defective bypass. Refer to troubleshooting sections.

HIGH LIMIT REMOVAL

PRESSURE SWITCH

The pressure switch, or heater actuator, insures that the

heater operates only when the filter pump is in operation.

It is located on the inlet/outlet header. 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, utilize the following procedure:

PRESSURE SWITCH ADJUSTMENT

Adjustment

Knob

NOTE: If heater is installed outside of the limits shown,

a higher pressure rated (11 psi) switch may be used or a

flow switch mounted and wired adjacent to the heater may

be used in place of the factory mounted pressure switch.

See Parts List for 11 psi pressure switch.

TWO SPEED PUMPS

In some cases, the flow on the low speed is insufficient

to operate the heater. This is apparent when the pressure

switch cannot be further adjusted or if the heater makes

banging noises or goes off on high limit. In these cases,

the pump must be run at high speed when heating the

water.

Fig. # 8152.2

PRESSURE SWITCH

ADJUSTMENT RANGE

Fig. #9440

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 adjustments made.

Fig. # 9439

1. Shut off main electrical

power switch to heater.

2. Remove inlet/outlet in-

spection panel.

3. Remove defective high

limit and replace with a

new high limit.

4. Replace inspection

panel.

PILOT SAFETY (Millivolt)

The heaters equipped with the standing pilot (millivolt

system), have pilot generators which act as a safety

device to shut off the flow of gas to the main burners and

the pilot burner in case the pilot flame is extinguished.

The pilot burner must be manually relighted to place the

heater in operation again. Refer to the lighting instruc-

tions provided on the heater label.

PILOT SAFETY (Electronic)

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.

Fig. #9438

CAUTION: Do not operate the heater without the

function of a properly adjusted pressure switch or flow

switch.

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Raypak 405B Operations Instructions Page 34

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