MG2S Installation Manual

26
Fan Mode
• When the thermostat energizes the G terminal for
continuous fan (without calling for heat or cooling), the
blower will operate at 50% of the selected high cooling
speed for continuous fan operation.
• 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.
MAINTENANCE
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury 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.
AVERTISSEMENT :
RISQUE DE DÉCHARGE ÉLECTRIQUE,
D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité
pourrait entraîner des blessures graves ou des
dommages matériels.
Un entretien inapproprié peut provoquer un
fonctionnement dangereux, des blessures graves,
la mort ou des dommages matériels.
• Avant toute intervention, couper l’alimentation
électrique du générateur d’air chaud.
• Pour l’entretien des commandes, étiqueter tous
les fils avant de les débrancher. Rebrancher les
fils correctement.
• Vérifier le bon fonctionnement après l’intervention.
Proper 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 close the door on the furnace after servicing
or cleaning/changing the filters. Do not operate the
furnace without the door closed.
• Verify the thermostat is properly installed and will
not be 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) - An air filter is supplied with the BW series
furnace as shipped from the factory. Filters should be
changed or cleaned monthly during the heating season.
Newly built or renovated homes may require more frequent
changing until the construction dust has minimized.
WARNING:
Never operate the furnace without a filter in place.
Dust and lint can build up on internal components,
resulting in loss of efficiency, equipment damage,
and possible fire.
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
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 steps 1-12. For component locations see Figure
22 (page 28).
1. Shut off gas supply to the furnace 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. Move the manual ON/OFF switch to the OFF position.
See Figure 21 (page 24).
4. 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!
5. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
6. Remove the piping between the gas valve and the
ground-joint union. (If applicable).
7. Remove all screws securing the burner box door.
8. Remove all screws securing the manifold assembly to
the burner box.
9. Remove all screws from the corners of the box and
carefully remove the burner assembly from the furnace.
IMPORTANT: DO NOT damage the igniter while
removing the burner assembly.