Raypak 399B-2339B Installation & Operating Instructions Manual

36the 120 VAC pilot duty terminals, located at J-14on the circuit board.29. The 120 VAC signal continues to the coil of relayK-4 (N.O.).30. The 120 VAC signal continues to the 120 VACsafety terminals located at J-13 on the circuitboard.31. When the coil on relay K-4 (N.O.) is powered, therelay 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 airplenum, 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 (PSwitch) terminal on the ignition modules.36. Once the pressure switch signals are received atboth ignition modules, hot surface igniter 1 is ener-gized by a 120 VAC signal from S-1 on ignitionmodule 1. (The hot surface igniter must drawgreater than 3.2 amps while being energized orignition lockout will occur after three tries.)37. Once ignition module 1 determines that hot sur-face igniter 1 has heated up and operatingproperly, 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 withthe (K-2) contacts closing downstream of thestage 2 connections and upstream of the stage 3connections.41. The gas coming through the burners should ignitefrom the heat of hot surface igniter 1 and the flameshould carry over from one burner to the otherburners of stage 1. The remote sensor is now try-ing to sense the flame. If the flame is not sensedwithin 4 seconds, the ignition module will shutdown the gas valve and retry the hot surface ignit-er. During ignition retry the heater must perform a15-second pre-purge and an approximately 30-second igniter warm-up before opening gas valve1 again. The standard ignition module will attemptignition a maximum of three times prior to ignitionlockout.42. After gas valve 1 opens and flame rectification isreceived, time delay relay 1 (TD-1) is powered andstarts 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 energizedallowing 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 3of 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 (Model1259B only).Models 1529B–2339B Only49. Power is applied to the “TH” terminal of ignitionmodule 2.50. Once the “TH” signal is received at ignition module2, hot surface igniter 2 is energized by a 120 VACsignal from S-1 on ignition module 2. (The hot sur-face igniter must draw greater than 3.2 amps whilebeing energized or ignition lockout will occur afterthree tries.)51. Once the ignition module determines that the hotsurface igniter has heated up and operating prop-erly, a 24 VAC signal is output from pin “valve” onthe module.52. 24 VAC signal is received at gas valve 3.53. The coil of relay K-5 (N.O.) is now energized withthe (K-5) contacts closing downstream of thestage 4 connections.54. Remote flame sensor 2 is trying to rectify flame.55. Power is now applied to time delay relay 3 and thecontacts of TD-3 located upstream of the stage 4