Part 2 Service
?
To make a specific test of the interlock circuit:
1.
Turn burner power
OFF.
2.
Turn Manual Gas Cock
OFF.
3.
Disconnect the motor wire from the terminal strip to keep the motor off.
4.
Turn burner power
ON
and set the operating control to
ON
or thermostat to call for
heat. Verify there is 120VAC line voltage by using a multimeter. Check for 24V
between the Ignition Control Module
24V
and
24V GND
terminals.
A. No voltage: Interlock circuit OK.
B. Voltage present: check that the switch is wired properly or check switch
operation. Replace if switch tests bad.
?
Should replacement or service be required, valve manufacturer's instructions must be
followed as outlined in their information sheet.
?
Outlet pressure settings must be checked while the gas is flowing.
?
To adjust outlet pressure, remove the seal cap for access to the adjusting screw. Turning the
screw clockwise will increase outlet pressure, counter clockwise will decrease outlet pressure.
?
The RE4400B / RE4400BA / RE4700BA / RE4850BA operate when power is applied to L1
and L2 through a safety or operating control. With power applied to L1 and L2 the blower
motor starts. Once the diaphragm airflow switch proves blower operation, power is applied to
the S8680J Ignition Module. The S8680J Ignition Module provides prepurge of 30 seconds,
ignition sequence timing, flame sensing and the switching of the gas valves. If the flame
signal is above 2 DC micro amps the gas burner will remain in operation until a safety or
operating control opens the circuit to L1 and L2. For a more thorough explanation of the
Honeywell control refer to the literature provided with the power burner. For startup
information see section VIII.
?
For operation characteristics, maintenance, and service procedures, refer to manufacturer's
literature provided with burner.
?
To check the flame signal on the gas burner you will need a DC micro amp meter. Install
the meter probes in series with the flame rod wire and the sense terminal on the control
board. Turn on the gas burner and observe the reading on the micro amp meter. If the flame
signal is above 2 DC micro amps the gas burner will continue to operate. If the flame signal
is below 2DC micro amps increase or decrease the pilot gas pressure by adjusting the pilot
gas pressure regulator as shown in Figure 5 clockwise to increase gas pressure and
counterclockwise to decrease gas pressure. See Table 4 for the correct pilot gas pressure
settings. Gas burner flame signal will vary for all applications and adjustments should be
made to the pilot gas pressure regulator and pilot flame signal before the main gas valve is
energized. To de-energize the main gas valve remove the wire connected to the MV terminal
on the S8680J Ignition Control Module.
Special equipment, either factory or contractor installed, may cause variation in the procedures
and descriptions given in this manual.
Consult the OEM's manual to identify the differences in the information.
The major difference for the CUL version of the RE4850BA, RE4700BA, RE4400BA and
RE4400B is the French / English specification plate, French / English manual and the firing
valve for the pilot line.
XI
Valve Train
XII
Sequence of
Operation
XIII
S8680J
Ignition
Control Module
Part 2
Service Continued
XV
Special
Equipment
(OEM Versions)
13
XIV
Ignition
Control Module
XVI
Canadian
Specifications
X
Motor Blower
Interlock
Continued
