Operating instructions

10
22. Maintenance And Service
Routine Maintenance By Home Owner
• Arrange for professional servicing of furnace by the
service or installation contractor annually.
• Homeowner is to maintain air fi lter or fi lters. A dirty
fi lter can cause furnace to over-heat, fail to maintain
indoor temperature during cold weather, increase fuel
consumption and cause component failure.
• Inspect, clean or replace fi lter monthly.
• Furnace is supplied with semi-permanent type fi lter.
If fi lter is damaged, replace with fi lters of same size
and type.
• During monthly fi lter inspection, inspect general
condition of furnace. Watch for signs of oil leaks in
vicinity of oil burner, soot forming on any external
part of furnace, soot forming around joints in vent
pipe, etc. If any of these conditions are present,
please advise your service or installation contractor.
Annual Service By Contractor
NOTICE
Combustion chamber (fi repot) is fragile. Use care
when inspecting and cleaning this area
• Inspect heat exchanger periodically and clean if
necessary.
WARNING
Electrical shock hazard. Turn OFF electrical
power supply at service panel before service or
maintenance Failure to do so could result in death or
serious injury.
!
• If cleaning is necessary, shut off oil supply, shut off
power to the furnace and remove burner.
• Use stiff brush with wire handle, brush off scale and
soot from inside drum and fl ue pipe.
• Clean radiator, remove clean-out cap screws.
Remove caps carefully to avoid tearing gaskets.
• Wire brush can be used to loosen dirt and debris
on the inside surfaces of radiator. Clean out all
accumulated dirt, soot and debris with a wire handled
brush and an industrial vacuum cleaner.
• Before replacing clean-out caps, inspect gaskets. If
gaskets are broken, remove remnants and replace
with new gaskets.
• Blower motor is factory oiled and permanently
sealed. Do not lubricate. Excess oil causes
premature electric motor failure.
• Inspect blower fan. Clean if necessary.
• Oil Burner Maintenance: Follow oil burner
manufacturer instructions.
• Change oil burner nozzle and oil fi lter annually.
• Clean and inspect venting system for signs of
deterioration. Replace pitted or perforated vent pipe
and fi ttings.
• Barometric damper should open and close freely.
• Check electrical connections to ensure tight
connections. Safety controls such as the high limit
controls should be tested for functionality.
• Check fan control to ensure fan on and off delay
function continues to start and stop blower fan at
optimal settings.
21b. Circulating Air Blower (HMLV)
HMLV furnace models are equipped with electronically
commutated motors (ECM).
Setting Blower Speed and “ON” and “OFF” Timings
Blower speed and on/off time delays are handled by ECM
motor programming and are set via dipswitches per Table
A-9 on page 17. Heating airfl ow rate is SW1 and on/off
delay is SW4, both are set according to fi ring rate. Cooling
airfl ow rate is SW2 and if used is set according to installed
cooling capacity. SW3 can be used to adjust airfl ow rate by
(+) or (-) 15%. Features of this ECM variable speed motor
are that it will deliver a constant airfl ow within a wide range
of external static pressures, and also includes:
• Soft Start: ECM will slowly ramp up to required
operating speed. In heating cycle allows heat
exchanger to reach operating temperature before set
heat speed, minimizes noise and increases comfort.
• Soft Stop: At end of heating cycle, ECM will slowly
ramp down. Allows increased energy effi ciency and
reduced noise levels.
• Dehumidifi cation: Dehumidifi cation feature is
programmed into the variable speed motor. At start
of each cooling cycle, variable speed motor will run
at 82% of rated airfl ow for 7.5 minutes. After 7.5
minutes has elapsed, motor will increase to 100% of
rated airfl ow. Used to provide dehumidifi cation and
improve system effi ciency.
• Continuous Fan Operation: When thermostat
continuous fan (G) switch is on without call for
heating or cooling, indoor fan is immediately
energized up to 50% of cooling speed. Allows
continuous circulation of air between calls for heating
or cooling. If call for heat (W) or cool (Y) occurs
during continuous fan, blower remains energized.