J962V Installation Manual

25
Fan Mode
• When the thermostat energizes the G terminal for
continuous fan (without calling for heat or cooling), the
indoor fan is energized on the selected FAN speed.
• If a call for cooling occurs during continuous fan, the
blower will switch over to the selected COOL speed.
• If the W terminal receives a call for heat during continuous
fan, the blower will de energize.
• A call for fan is ignored while in lockout.
• For continuous fan operation, the blower motor will
operate at 35% of the selected high-speed torque when
equipped with a fixed speed motor control board. The
blower motor will operate at 50% of the high-speed CMF
when equipped with a variable speed motor control
board.
MAINTENANCE
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
PropeProper maintenance is most important to achieve the
best performance from a furnace. Follow these instructions
for years of safe, trouble free operation.
• These maintenance instructions are primarily intended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the furnace after servicing
or cleaning/changing the filters. Do not operate the
furnace without all doors and covers in place.
• Verify that the thermostat is properly installed and is not
affected by drafts or heat from lamps or other appliances.
• To achieve the best performance and minimize
equipment failure it is recommended that a yearly
maintenance checkup be performed. At a minimum,
this check should include the following items:
Air Filter(s) - Air filter(s) are not supplied with the furnace
as shipped from the factory. The installer must provide a
high velocity filter and rack for a filter in the return air duct
adjacent to the furnace, or in a return air grill to the furnace.
WARNING:
Never operate the furnace without a filter in
place. Dust and lint in the return air can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
It is recommended that filters be 1” or 2” thick and be
cleaned or replaced monthly. Filters designed to remove
smaller particles such as pollen, may require additional
maintenance. Filters for side return and bottom return
applications are available from most local distributors.
Blower Compartment - Dirt and lint can create excessive
loads on the motor resulting in higher than normal operating
temperatures and shortened service life. It is recommended
that the blower compartment be cleaned of dirt or lint that
may have accumulated in the compartment or on the
blower and motor as part of the annual inspection.
Cleaning of Burners - If the burners must be cleaned,
follow the steps below and see Figure 29 (page 34) and
for component location.
1. Shut off gas supply to the furnace either at the meter
or at a manual valve in the supply piping.
2. Turn off all power to the furnace and set the thermostat
to it’s lowest setting.
3. Remove the burner door from the furnace.
4. Turn the gas control switch to the OFF position.
5. Disconnect the wires from the gas valve, igniter, flame
sensor, and flame rollout switch.
CAUTION:
To prevent damage to the unit or internal
components, it is recommended that two
wrenches be used when loosening or tightening
nuts. Do not over tighten!
6. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
7. Remove the piping between the Gas Valve and the
ground-joint union. (If applicable).
8. Remove all screws securing the Manifold Assembly to
the Burner Box.