Gas Heating Sequence Of Operations; Electric Heat Anticipator Setpoints - York SUNLINE MAGNUM WJ240 Installation Manual

TABLE 32: ELECTRIC HEAT ANTICIPATOR
SETPOINTS
HEATER
VOLTAGE
KW
18
36
208/230-3-60
54
72
18
36
460-3-60
54
72
18
36
575-3-60
54
72

GAS HEATING SEQUENCE OF OPERATIONS

The following sequence describes the operation of the
gas heat section.
For units with VFD and gas heat, the speed of
the indoor blower motor continues to be con-
trolled by duct static pressure via the VAV con-
trol board.
If there are VAV boxes present in the duct sys-
tem, the boxes must be driven to the full-open
position using a customer-supplied power
source to assure adequate airflow across the
heat exchanger tubes.
When the thermostat calls for the first stage of heating,
the low-voltage control circuit from "R" to "W1" and "G"
is completed, thru the UCB. The heat relay "RW1" is
energized. The "RW1-2" contacts close energizing the
draft motor control. The draft motor control contacts
close and start the draft motor. As the speed of the
draft motor reaches approximately 2500 RPM, the cen-
trifugal switch contact, located on the end of the draft
motor shaft, closes to power the first stage ignition
module "IC1", thru the "RW1-1 contacts.
Ignition module "IC1" will immediately start the first
stage igniter sparking and will open the redundant
valve located inside the first stage main gas valve
Johnson Controls Unitary Products
SETTING, AMPS
TH1 TH2
0.29 -
0.29 0.29
0.29 0.58
0.29 0.58
0.29 -
0.29 0.29
0.29 0.29
0.29 0.29
0.29 -
0.29 0.29
0.29 0.29
0.29 0.29
"GV1" to allow a flow of gas to only the first stage carry-
over tube. Only after the pilot flame has been ignited
and the presence of pilot flame detected at the "IC1" by
a signal sent back through the flame sensor is sparking
terminated and the first stage main gas valve opened.
Gas flows into each of the main burners and is ignited
from the carryover tube flame.
After completing the specified fan on delay for heating,
the UCB will energize the blower motor.
If "IC1" fails to detect a pilot flame, it will continue to try
for a maximum of 85 seconds to ignite the pilot tube. If
the pilot flame is not detected, then "IC1" will lock out
first stage furnace operation for five minutes or until
24V power is removed from the module either at the
unit or by resetting the room thermostat.
When the thermostat calls for the second stage of
heating, the low-voltage control circuit from "R" to "W2"
is completed, thru the UCB. Heat relay "RW2" is ener-
gized. The "RW2-1" contact is closed energizing the
second stage ignition module "IC2". "IC2" will immedi-
ately start the second stage igniter sparking and will
open the redundant valve located inside the second
stage main gas valve "GV2" to allow a flow of gas to
the second stage carryover tube. Only after the pilot
flame has been ignited and the presence of pilot flame
detected at "IC2" by a signal sent back through the
flame sensor is sparking terminated and the main gas
valve opened.
Gas flows into each of the second stage main burners
and is ignited from the carryover tube flame.
If "IC2" fails to detect a pilot flame, it will continue to try
for a maximum of 85 seconds to ignite the pilot tube. If
the pilot flame is not detected, then "IC2" will lock out
first stage furnace operation for five minutes or until
24V power is removed from the module either at the
unit or by resetting the room thermostat.
That the second stage furnace can operate
NOTE:
even if first stage has locked out.
When the thermostat satisfies de-energizing the
"RW2"and "RW1", thus opening all gas valves. The
blower motor will continue to run after the furnace is
shut down until the specified fan off delay for heating
has been satisfied. The UCB will de-energize the
blower motor.
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