Raypak RP2100 ASME Operations Instructions download pdf (Page 42)

FLAME ROLL-OUT SAFETY SWITCH

Atmospheric heaters are

equipped with a thermal cutoff

device to prevent flame roll-out

in the event the heat exchang-

er 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.

1. Make sure the pool filter is

clean before adjusting the

switch.

2. Set the heater control to the

OFF mode.

3. Turn the filter pump on and

confirm that the pressure

TWO-SPEED PUMPS

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

to operate the heater. This is apparent when the water

pressure switch cannot be further adjusted or if the

heater makes banging noises or shuts off on high limit.

In these cases, the pump must be run at high speed

when heating the water.

PRESSURE SWITCH

ADJUSTMENT RANGE

CAUTION: Do not operate the heater without the

function of a properly adjusted water pressure switch

or flow switch.

5 FT.

POOL OR SPA

AY REQUIRE ADJUSTMENT

FOR LOWER PRESSURE

MAY REQUIRE ADJUSTMENT

FOR HIGHER PRESSURE

5 FT.

MAX

switch is closed (use a multimeter to check). If the

pressure switch fails to close, either the switch set-

ting is too high or not enough pressure is being

supplied by the filter pump.

NOTE: If heater is installed outside of the limits

shown, a higher pressure rated (11 psi) switch may be

used. A flow switch, mounted and wired adjacent to the

heater, may be used in place of the factory-mounted

pressure switch. See Parts List (pg. 56) for 11 psi

water pressure switch.

WATER PRESSURE SWITCH

The water pressure switch, or heater actuator, ensures

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 adjust the pressure

switch to compensate for the no-flow static head. If it

is necessary to adjust the water pressure switch, uti-

lize the following procedure:

WATER PRESSURE SWITCH ADJUSTMENT

Adjustment

Knob

TIME CLOCK/FIREMAN’S SWITCH

4. Turn the heater ON.

5. Manually turn the pressure adjustment knob clock-

wise until the heater shuts off. (A flat screwdriver

may be necessary if knob is too tight.)

6. Slowly turn the adjustment knob counter-clockwise

until the heater calls for heat again.

7. Turn an additional 1/2 turn counter-clockwise.

8. While the heater is running, check the adjustment

y turning the pump off and on several times. The

burners should shut off immediately when the

pump is turned off. If it does not, repeat the above

steps until proper operation is observed.

To operate the heater with a time clock, connect the

imer to the fireman’s switch connection in the heater’s

wiring. The time clock should be of the dual switch

type and set to shut off the call for heat to the pool

heater 15 to 20 minutes prior to shutting down the pool

ump. On millivolt heaters the fireman’s switch con-

nection is a wire nut located in the Violet/Black wiring

between the manual toggle switch and the gas valve.

For digital heaters the fireman’s switch connection is

located on the 14-pin header connected to the digital

control board. Splice into the red wire jumper tagged

“Where necessary add “Fireman’s” switch circuit here”

to connect the time clock. The fireman’s switch con-

nection on both millivolt and digital heaters must

be a dry contact and must not supply power to the

heater. Powering the fireman’s switch connection

externally may damage the heater, and is not

cov-

ered by warranty.

Millivolt heaters: Do not exceed 15ft of total wiring

using 14 AWG stranded copper wire rated for 105ºC

(221ºF) minimum.

Digital/AFT heaters: Do not exceed 50ft of total wiring

using 18 AWG stranded copper wire rated for 105ºC

(221ºF) minimum.

NOTE: When using a time clock, the heater will dis-

play “CLK” (with a Digital PC Board) or “Clock/

Fireman Sw” (with an AFT Board) when the fireman’s

switch is open, indicating that the time clock has shut

off the call for heat.

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Raypak RP2100 ASME Operations Instructions Page 42

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