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36
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.S.)
terminal on the ignition module.
36. Once the pressure switch signal is received at the
ignition module the hot surface igniter is energized
by a 120 VAC signal from S-1 on the ignition mod-
ule. (The hot surface igniter must draw greater
than 3.1 amps while being energized or ignition
lockout will occur after three tries.)
37. 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 GV on the
module.
38. 24 VAC signal is received to gas valve 1 thus ener-
gizing it.
39. The stage 1 LED on the diagnostics display board
is now illuminated.
40. The coil of relay K-2 (N.O.) is now energized with
the (K-2) contacts closing downstream of the
stage 2 and stage 3 connections.
41. The gas coming through the burners should ignite
from the heat of the hot surface igniter 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
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) starts a 5-sec-
ond countdown.
43. After the 5 second countdown from TD-1, 24 VAC
is waiting at pin 3 of the stage 2 connection on the
CPW board.
44. After closure of the stage 2 contacts Gas valve 2
in energized.
45. The stage 2 LED on the diagnostics display board
is now illuminated.
46. The stage 3 controller contacts close and power is
applied to TD-2.
47. After 5 seconds TD-2 contacts close.
48. Gas valve 3 receives 24 VAC and is energized.
49. The stage 3 LED on the diagnostics display board
is now illuminated (end of sequence for 992A).
50. The stage 4 controller contacts close (1262A
only).
51. Power is now applied to time delay relay 3 and the
contacts of TD-3 close after 5 seconds.
52. Power is applied to gas valve 4 (solenoid).
53. The stage 4 LED on the diagnostics display board
is now illuminated.
54. The heater is now operating at full fire.
Models 1532A – 1802A
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
Economaster II pump delay.
4. Terminals L1 and F1 of ignition module 1 are pow-
ered with 120VAC.
5. 120 VAC power is also applied to the control
power connector on the circuit board.
6. Terminals L1 and F1 of ignition module 2 are pow-
ered with 120VAC.
7. 120 VAC power is waiting at relay contacts K-4 to
energize the heater blower.
8. The 120/24 VAC transformer outputs 24 VAC.