Raypak 399B-2339B Operations Instructions download pdf (Page 33)

Fig. 27: Status LED Indicator Decal

Heater Sequence of Operation

Models 399B–899B

1. The black (hot) wire lead goes directly to the main

power switch. This black toggle switch is located

at the middle front of the control compartment.

2. When the main power switch is placed in the “ON”

position, 120 VAC is applied to the 120 VAC termi-

nal block on the circuit board and the 120/24 VAC

transformer is powered.

3. 120 VAC is waiting at the N.O. contacts of the

pump delay relay.

4. Terminals L1 and F1 of the ignition module are

powered with 120VAC.

5. 120 VAC power is also applied to the control

power connector on the circuit board.

6. 120 VAC power is waiting at relay contacts K-3 to

energize the heater blower.

7. The 120/24 VAC transformer outputs 24 VAC.

8. 24 VAC is sent to power terminal L1 of the low

water cut-off board (optional).

9. 24 VAC is applied to the red LED safety shutdown

light on the front of the unit.

10. 24 VAC is applied to the alarm circuit (optional). If

the E-5 sales option (Alarm) is included a 5 sec-

ond time delay relay will not allow the alarm to

sound unless the circuit stays energized for more

than 5 seconds.

11. Power is output from terminal J5-24V of the CPW

board to all of the safeties. All safeties are verified

to ensure that it is safe to operate the heater. The

safety components wired into the diagnostic board

are: Manual reset high limit, low water cut-off

(optional), blocked vent switch, low gas pressure

switch (optional), and high gas pressure switch

(optional).

12. Once all safeties have been verified to be closed a

24 VAC signal is sent to pin P3-16 of J-5 on the

CPW board.

13. 24 VAC power now leaves pin P3-16 of J-5 on the

CPW board and is sent to the auto-reset high limit

(optional). If closed the power now goes to termi-

nal P1-4 of J-5 on the CPW board.

14. Power is applied to terminal 24V of the pump

delay relay to energize the timing circuit .

15. Relay K-1 (N.C.) will now be energized, and opens

the N.C. contacts to disable the alarm (optional)

and turn off the red safety shutdown light.

16. Pin P1-4 on the diagnostic board will now output a

24 VAC signal to pin 1 of the “standby switch”.

17. The “standby switch” (rocker switch) located at the

lower left front of the control compartment is now

Table N: Status LED Indicators

External Lights

Light Color Indication

Power On Green

24 VAC

switched on

Call For Heat Amber

Thermostat is

closed

Burner Firing Blue

Burner(s) are

firing

Service Req’d Red

Service

required

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Raypak 399B-2339B Operations Instructions Page 33

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