York 66441-YUM-D-1011 User Manual
66441-YUM-D-1011
Johnson Controls Unitary Products
3
When the thermostat calls for heat, pilot gas is supplied and
at the same time, sparking occurs to light the pilot gas. With
the pilot lit, the flame sensor rod closes a circuit to the ignitor
control which then opens the gas valve to admit main burner
gas.
at the same time, sparking occurs to light the pilot gas. With
the pilot lit, the flame sensor rod closes a circuit to the ignitor
control which then opens the gas valve to admit main burner
gas.
When the room thermostat is satisfied, the electrical circuit to
the gas valve is opened, closing off both main burner and
pilot gas simultaneously. If the pilot burner should fail to light,
contact your heating contractor or gas utility for service to
insure that proper operating conditions are restored.
the gas valve is opened, closing off both main burner and
pilot gas simultaneously. If the pilot burner should fail to light,
contact your heating contractor or gas utility for service to
insure that proper operating conditions are restored.
INPUT
The correct heat capacity of the furnace is regulated by the
burner orifices and the gas pressure. The proper orifices are
furnished but the gas pressure regulator must be adjusted by
the installer or gas utility service technician.
burner orifices and the gas pressure. The proper orifices are
furnished but the gas pressure regulator must be adjusted by
the installer or gas utility service technician.
OPERATING INSTRUCTIONS
TO SHUT DOWN THE FURNACE:
1.
Close the main gas shutoff valve(s).
2.
Turn off the electric power supply.
TO LIGHT THE FURNACE:
1.
Do not attempt to light manually.
2.
Open the main gas shutoff valve(s).
3.
Adjust the set point of the room thermostat above the tem-
perature in the space.
perature in the space.
4.
Turn on the electric power supply.
5.
The draft fan will operate. After an adequate purge time,
the electric spark igniter will light the burners.
the electric spark igniter will light the burners.
6.
The burners will extinguish and relight automatically upon
the demand of the room thermostat.
the demand of the room thermostat.
VENT SAFETY SYSTEM:
This gas furnace is equipped with an automatic reset high
temperature sensor or rollout switch which in the unlikely
event of a sustained main burner flame rollout will shut off the
flow of gas by closing the main gas valve. The ignition mod-
ules will also be disabled, preventing the flow of gas to the
valves. The switch is located inside the gas heat access
panel above the burner inlet. Flame rollout can be caused by
blockage of the power vent system, improper gas pressure or
adjustment. If this event occurs the furnace will not operate
properly, gas supply to the furnace should be shut off and no
attempt should be made to place the furnace in operation.
The system should be inspected by a qualified service techni-
cian. Refer to Figure 2 for a typical installation.
temperature sensor or rollout switch which in the unlikely
event of a sustained main burner flame rollout will shut off the
flow of gas by closing the main gas valve. The ignition mod-
ules will also be disabled, preventing the flow of gas to the
valves. The switch is located inside the gas heat access
panel above the burner inlet. Flame rollout can be caused by
blockage of the power vent system, improper gas pressure or
adjustment. If this event occurs the furnace will not operate
properly, gas supply to the furnace should be shut off and no
attempt should be made to place the furnace in operation.
The system should be inspected by a qualified service techni-
cian. Refer to Figure 2 for a typical installation.
100% SHUT OFF:
The ignition modules are designed for 100% shut-off. If the
furnace fails to ignite within 85 seconds after a call for heat,
the flow of gas (including pilot) will be shut off and the ignition
module will lock out. The module can be reset by:
furnace fails to ignite within 85 seconds after a call for heat,
the flow of gas (including pilot) will be shut off and the ignition
module will lock out. The module can be reset by:
A.
Turning the system switch on the room thermostat to the
“OFF” position and back to the “HEAT” position.
“OFF” position and back to the “HEAT” position.
B.
Decreasing the set point of the room thermostat below
the temperature in the conditioned space and returning it
to its original setting.
the temperature in the conditioned space and returning it
to its original setting.
C.
Opening and closing the unit's main disconnect switch.
FIGURE 2 - TYPICAL INSTALLATION