6
240011511 REV. C [05/31/2017]
7. Air Filter
•
Install properly sized air filter on return air side of unit.
•
Furnace is supplied with 20" x 20" permanent air filter and
filter slot in blower compartment.
•
If filter is damaged, replace with filter of same size and type.
8. Ductwork
• Supply and return air ductwork must be designed and
installed in accordance with approved methods, local and
national codes as well as good trade practices.
• When ductwork supplies air to space other than where
furnace is located, return air must be sealed and directed to
this space.
10. Chimney Venting
• Flue pipe should be as short as possible with horizontal pipes
sloping upward toward the chimney at a rate of one-quarter
inch per foot.
• Flue pipe should not be smaller in cross sectional area than
flue collar on the furnace.
•
Flue pipe should connect to chimney so the flue pipe extends
into, and terminates flush with the inside surface of chimney
liner. Seal the joint between pipe and lining.
• Chimney outlet should be at least two feet above highest
point of peaked roof.
• All unused chimney openings should be closed.
• Chimneys must conform to local, provincial or state codes,
or in the absence of local regulations, to the requirements of
the National Building Code.
WARNING
Asphyxiation hazard. Chimney vented versions of
furnace must be connected to flue having sufficient
draft at all times. Failure to follow these instructions
could result in death or serious injury.
!
NOTICE
This furnace is approved for use with Type L vent or
equivalent. Maximum vent temperature for Type L vent
is 575°F (300°C).
WARNING
Failure to provide adequate combustion and ventilation
air could result could result in death or serious injury.
!
9. Combustion and Ventilation Air
Comply with CSA B139 (Canada) or NFPA 31 (US) standards for
the Installation of Oil Burning Equipment and applicable provisions
of local building codes to provide combustion and ventilation air.
13a. Fan Timer Board And Limit Control (LRF)
[See Figure 2, page 15]
Electronic Fan Timer integrates control of burner and
circulator fan operations. Control is central wiring point for
most of furnace electrical components.
• United Technologies 1158-120 has an adjustable fan on time
set by selecting dipswitch combination displayed in Chart
1. Fan on delay can be set at 30, 60, 90 or 120 seconds.
Provides a delay between burner ignition and blower start-up
to eliminate excessive flow of cold air when blower comes
on. Manufacturer recommended fan on delay is 30 seconds
for LRF100 models and 60 seconds for LRF65/80/90 models.
• United Technologies 1158-120 has an adjustable fan off time
of 2, 3, 4 or 6 minutes as displayed in Chart 1. Fan off delay
time starts when burner motor is de-energized at end of call
for heat. Blower shutdown is delayed to remove any residual
heat from heat exchanger. Manufacturer recommended fan
off delay is 2 minutes.
• Electronic fan timer board works in conjunction with snap
disc limit controls, performing a safety function, shutting off
burner if furnace over-heats.
11. Barometric Damper Control
Barometric damper control, also known as draft regulator, is used
on conventional chimney venting only. Control automatically
maintains constant negative pressure. Ensures proper pressures
are not exceeded. If chimney does not develop sufficient draft,
draft control does not function properly.
• Install draft regulator in same room or enclosure as furnace.
Draft regulator should not interfere with combustion air
supplied to the burner.
•
Locate control near furnace flue outlet.
• Install per instructions supplied with regulator.
• Set breech draft to -0.02 in. w.c.
Manufacturer recommends breech draft of -0.02 in. w.c.
Flue pipe must not pass through any floor or ceiling, may pass
through a wall where suitable fire protection provisions have been
installed.
• Canada, refer to CAN/CSA B-139 for rules governing the
installation of oil burning equipment.
• United States, refer to NFPA 31 for regulations governing the
installation of oil burning equipment.
See appendix A for burner set-up.
12. Optional Direct Venting
Certain LRF/LRFV furnaces are manufactured as direct vent
units. Refer to Direct Vent Supplement Installation, Operation
and Maintenance Manual, part number 240011896, included with
direct vent furnace, for details.
Direct venting requires use of specific oil burners, Beckett NX or
Riello 40BF3 or 40BF5.
Refer to Appendix A, Tables A-2 and A-4.
