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29. The 120 VAC signal continues to the coil of relay
K-4 (N.O.).
30. The 120 VAC signal continues to the 120 VAC
safety terminals located at J-13 on the circuit
board.
31. When the coil on relay K-4 (N.O.) is powered, the
relay contacts (K-4) close and energize the blow-
ers from the J-8 connections on the CPW board.
32. After proper air pressure is received in the air ple-
num, the air pressure switches will close.
33. Power is applied to the optional equipment inter-
lock connection (normally jumpered).
34. The 24 VAC signal is then sent to the 24 VAC safe-
ty connector.
35. 24 VAC is now sent to the pressure switch (P
Switch) terminal on the ignition modules.
36. Once the pressure switch signals are received
at both ignition modules, hot surface igniter 1 is
energized by a 120 VAC signal from S-1 on igni-
tion module 1. (The hot surface igniter must draw
greater than 3.2 amps while being energized or ig-
nition lockout will occur after three tries.)
37. Once ignition module 1 determines that hot sur-
face igniter 1 has heated up and operating proper-
ly, a 24 VAC signal is output from terminal "valve"
on module 1.
38. 24 VAC signal is sent to gas valve 1.
39. The blue LED on the front of the unit is now illumi-
nated.
40. The coil of relay K-2 (N.O.) is now energized with
the (K-2) contacts closing downstream of the stage
2 connections and upstream of the stage 3 con-
nections.
41. The gas coming through the burners should ig-
nite from the heat of hot surface igniter 1 and the
flame should carry over from one burner to the
other burners of stage 1. The remote sensor is
now trying to sense the flame. If the flame is not
sensed within 4 seconds, the ignition module will
shut down the gas valve and retry the hot surface
igniter. During ignition retry the heater must per-
form a 15-second pre-purge and an approximate-
ly 30-second igniter warm-up before opening gas
36
valve 1 again. The standard ignition module will
attempt ignition a maximum of three times prior to
ignition lockout.
42. After gas valve 1 opens and flame rectification is
received, time delay relay 1 (TD-1) is powered and
starts a 5-second countdown.
43. After the 5 second countdown from TD-1, the con-
tacts close time delay relay 2 receives 24 VAC.
44. After 5 seconds gas valve 1a is now energized al-
lowing the remainder of stage 1 to fire.
45. After the 5-second countdown from TD-2 the inter-
nal contacts close allowing 24 VAC to sit at pin 3 of
the stage 2 connection on the CPW board.
46. The temperature controller closes the stage 2 con-
tacts and gas valve 2 in energized.
47. The temperature controller closes the stage 3 con-
tacts at J-3 on the CPW board.
48. 24 VAC signal is received at gas valve 3 (Model
1259B only).
Models 1529B–2339B Only
49. Power is applied to the "TH" terminal of ignition
module 2.
50. Once the "TH" signal is received at ignition module
2, hot surface igniter 2 is energized by a 120 VAC
signal from S-1 on ignition module 2. (The hot sur-
face igniter must draw greater than 3.2 amps while
being energized or ignition lockout will occur after
three tries.)
51. Once the ignition module determines that the hot
surface igniter has heated up and operating prop-
erly, a 24 VAC signal is output from pin "valve" on
the module.
52. 24 VAC signal is received at gas valve 3.
53. The coil of relay K-5 (N.O.) is now energized with
the (K-5) contacts closing downstream of the stage
4 connections.
54. Remote flame sensor 2 is trying to rectify flame.
55. Power is now applied to time delay relay 3 and the
contacts of TD-3 located upstream of the stage 4
connection close after 5 seconds.
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