Operating instructions

-
--I NEUTRAL
T
LINE
-
K0d HOT
ENCLOSED
SW
l TCH
HONEYWELL
L8124C
IMMERSION
CONTROL
RELAY
THERMOSTAT
F
i I II 1 RELAY
CIRCULATOR
THERMOSTAT
CIRCULATOR
AT
I
HONEYWELL
CIRCULATOR
SEQUENCE OF OPERATION
A call for heat by the thermostat for Zone #1 connected to the L8124C control energizes the L8124C control which in
turn energizes the R8184 control to turn on the burner. If burner ignites within approximately 45 seconds and the cad
cell sees flame the burner will continue to operate until the call for heat is satisfied. The circulator will also operate
when the thermostat calls for heat if the boiler water temperature is up to the setting of the low limit in the
L8124C
control. If boiler water temperature is below the low limit setting ,the burner will operate but the circulator will not,
giving preference to the domestic hot water demand.
On call for heat by the thermostat the burner will continue to operate until the thermostat is satisfied or the setting of
the high limit is reached. If the thermostat is not satisfied when the high limit is reached the burner will stop but the
circulator will continue to operate until the thermostat is satisfied.
Any time the boiler
water temperature drops below the setting of the low limit the burner will be energized in order to
maintain domestic water temperature.
i
For any of the "add on" zones the operation is basicallv the same as Control Set #5 except for the fact that the thermo-
stat for the add on zones energizes the R845A switching re,ay which then energizes the burner through -the L8124C con-
troller and the
R8184 control. Since the power to the Ka45A switching relays is supplied by the L8124C low limit switch
none of the "add on" zone circulators can be energized unless the boiler water temperature is up to the low limit setting
again giving preference to the domestic water demand.
52 Wiring Diagram for "Add-On" Zone Control Set
SET NO. 6
BOILER WITH CIRCULATOR AND STORAGE TANK DOMESTIC HOT WATER
HONEYWELL L4006A I,( THERMOSTAT
IMMERSION OPERATING
CONTROL
No. 6 Wiring Diagram for Forced Hot Water
Boilers with Storage Tank Heater
12