7
P/N 30149, Rev. G [12/15/2016]
9. 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 over fire draft, measured at oil burner mounting
plate over-fire draft access port, to -0.02 in. w.c. See
Figure 2 page 6.
10. Optional Side Wall Venting
Certain BML and BMLV furnace models are manufactured
as sidewall vented units. Refer to Direct Venting Instructions,
P/N 240006979 included with Vent Kit for details.
Sidewall Venting (
Direct Venting
) requires use of specific oil
burners; Beckett AFII, or Riello 40BF.
Refer to Appendix A, Tables A2, and A4.
11a. Fan Timer Board And Limit Control (BML)
See Figure 3, 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 (BML) 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.
•
United Technologies 1158-120 (BML)
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.
• Electronic fan timer board works in conjunction with
snap disc limit controls, performing a safety function,
and breaks power to oil burner primary control,
shutting off burner if furnace over-heats.
• Limit control is thermally operated and automatically
resets. Limit control is factory installed, pre-set and
is not adjustable.
•
If limit control opens with United Technologies 1158-
120 (BML)
electronic fan control
,
circulating fan will
energize. When limit closes, fan off timer begins.
At the end of fan off time cycle burner is energized,
initiating normal burner cycle.
Chart 1- United Technologies 1158-120 (BML)
Dip Switch Position
Blower Delay Times
1
2
3
4
On Seconds
Off Minutes
Off
Off
30
On
Off
60
Off
On
90
On
On
120
Off
Off
2
On
Off
3
Off
On
4
On
On
6
11b. Fan Timer Board And Limit Control (BMLV)
[See Figure 4, page 15]
United Technologies 1168-1 ECM (BMLV) tap board has an
adjustable fan on/off delay and airflow settings that must
be adjusted in accordance with furnace input rating (nozzle
size). Refer to Table A-9, page 17 for ECM blower set-up.
12. Electrical Connections
• Furnace is listed by Canadian Standards Association
under NRTL (North American) Standard.
•
All field wiring shall conform to CAN/CSA C22.1
Canadian Electrical Code, Part 1, and by local codes,
where they prevail.
• United States, wiring shall conform to National Fire
Protection Association NFPA-70, National Electrical
Code, and with local codes and regulations.
• Wire furnace to separate dedicated circuit in main
electrical panel.
• Suitably located circuit breaker can be used as
service switch, separate service switch is advisable.
• Service switch is necessary if circuit breaker is close
to the furnace, or furnace is located between circuit
breaker and entry to furnace room.
• Clearly mark service switch. Install in accessible area
between furnace and furnace room entry. Locate so
as to reduce possibility it can be mistaken as light
switch or similar device.
• Power requirement for BML and BMLV models is: 115
VAC, 1 Ø, 60 Hz., 12A.
• Accessory equipment such as electronic air cleaners
and humidifiers may be included on furnace circuit.
• Accessories requiring 115 VAC power sources such
as electronic air cleaners and humidifier transformers
may be powered from electronic
fan timer board
where provisions have been made for connections,
but should have their own controls.
• Do not use direct drive motor connections as a power
source, there is risk of damaging accessories.
