38
2. Honeywell EI Sequence of Operation
a. Normal Operation
i.
Thermostat or operating control calls for
heat. Vent Damper (if used) opens.
ii.
Ignition Module Terminals PV, MV/PV
and the Ignition Terminal are energized.
Terminals PV and MV/PV power the Pilot
Valve in the Gas Valve supplying gas to
the Pilot. The Ignition Terminal supplies
voltage to the Ignition Electrode creating an
electric spark to ignite the Pilot.
iii.
The sensing Circuit between the Q3481B
Pilot Burner and the IGNITION MODULE
proves the presence of the Pilot Flame
Electronically and the Ignition Terminal is
de-energized.
iv.
Terminals MV and MV/PV of the
IGNITION MODULE are energized and
supply power to the Main Gas Valve. The
Gas Valve is energized allowing main gas
flow, and ignition of Main Burners.
v.
Call for heat ends. Ignition module is de-
energized, de-energizing gas valve, and
extinguishing pilot and main flame. Vent
Damper (if used) closes.
b. Safety Shutdown
i.
Limit: Automatically interrupts power
to the Ignition Module and Gas Valve(s),
extinguishing pilot and main flame, when
water temperature exceeds set point.
Maximum allowable temperature is 250°F.
Circulator continues to operate with call for
heat, Vent Damper (if used) closes. Normal
operation resumes when water temperature
falls below set point.
ii.
Blocked Vent Switch: Automatically
interrupts main burner operation when
excessive flue gas spillage occurs.
Circulator continues to operate and Vent
Damper (if used) remains open with call
for heat. If blocked vent switch is activated
do not attempt to place boiler in operation.
Correct cause of spillage and reset blocked
vent switch.
iii.
Flame Roll-out switch: Automatically
interrupts main burner operation when
flames or excessive heat are present in
vestibule. Circulator continues to operate,
Vent Damper (if used) remains open with
call for heat. Control is single use device.
If flame roll-out switch is activated, do not
attempt to place boiler in operation. Correct
cause of spillage and replace flame roll-out
switch.
iv.
Pilot
– Pilot failure can occur during the start-up or
the operating cycle of the boiler. Any pilot
failure of the Q3481B Electronic Pilot, after
ignition of pilot flame will close the main
gas valve in 0.8 seconds.
– For approximately 90 seconds after failure
of the Q3481B pilot, the module through
the ignition terminal will try to reestablish
pilot flame. If no pilot flame can be sensed
by the flame rod circuit, terminals PV and
MV/PV are de-energized and the module
will lock out on safety. Five to six minutes
after shutdown, the IGNITION MODULE
restarts the ignition sequence. The ignition
trial, shutdown, and wait sequence continues
until either the pilot lights or the Thermostat
is set below room temperature (to end the
call for heat). The ignition sequence can be
reset by setting down the Thermostat for one
minute.
c. Trouble Shooting Guide. See Page 61.
Summary of Contents for 805H
Page 15: ...15 Figure 8 Jacket Assembly...
Page 16: ...16 Figure 9 EP Control Installation...
Page 18: ...18 Figure 10 Schematic Gas Piping 24V Standing Pilot 806H 807HE...
Page 19: ...19 Figure 11 Main Gas Piping Intermittent Ignition EI...
Page 20: ...20 Figure 12 Schematic Pilot Piping Honeywell EI USA...
Page 22: ...22 Figure 14 Schematic Gas Piping EP Control System Natural Gas Only 806H 810HE...
Page 23: ...23 Figure 15 Schematic Gas Piping EP CSD 1 Control System 808HE 810HE...
Page 36: ...36 Figure 27 Wiring Diagram Standing Pilot 24V Continuous Circulation 806H 807HE...
Page 37: ...37 Figure 28 Wiring Diagram Standing Pilot 24V Intermittent Circulation 806H 807HE...
Page 39: ...39 Figure 29 Wiring Diagram Honeywell EI USA Canada 805 Only with Hydrostat 3200 Control...
Page 40: ...40 Figure 30 Wiring Diagram Honeywell EI USA Continuous Circulation 806 810...
Page 41: ...41 Figure 31 Wiring Diagram Honeywell EI USA Intermittent Circulation 806 810...
Page 50: ...50 Figure 40 Lighting Instructions 24V Standing Pilot...
Page 51: ...51 Figure 41 Operating Instructions EI...
Page 52: ...52 Figure 42 Operating Instructions EP...
Page 61: ...61 Honeywell EI Trouble Shooting Guide...
Page 76: ...76...
Page 78: ...78...
Page 82: ...82...
Page 83: ...83...
Page 84: ...84...
