Airco BCL-190, Installation, Operation & Maintenance Manual

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PN 28141 REV. K [10/30/2018]
Chart 1- United Technologies 1158-120
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. Models with Mechanical Fan And Limit
Control
Furnace equipped with White Rodgers 5D51 fan and limit
control. Temperature sensitive fan switch is actuated by a
helical bi-metal sensing element enclosed in a metal guard,
and controls the circulating air blower. This provides a delay
between burner ignition and blower start up to eliminate
excessive flow of cold air when blower comes on.
Blower shutdown is also delayed to remove any residual
heat from heat exchanger and improve annual efficiency
of the furnace. Fan on settings of 110º F to 130º F (43º C
to 55º C) and fan off settings of 90º F to 100º F (32º C to
37ºC) will usually be satisfactory.
Limit switch performs safety function and breaks power
to oil burner primary control, which shuts off the burner if
furnace over-heats. Limit control is thermally operated and
automatically resets.
Limit control is factory installed, pre-set. Limit control
incorporates a limit stop which prevents the limit switch
from being set above the factory setting. Do not tamper
with or attempt to adjust limit stop. The limit control should
be set at or below the factory setting. DO NOT SET LIMIT
CONTROL ABOVE FACTORY SETTINGS.
Model Factory Limit Control Setting
BCL-S 230°F
BFL 190°F
BCL High Capacity 200°F
Limit control and fan control are incorporated in same
housing and are operated by the same thermal element.
12. Electrical Connections
• Furnace is listed by Canadian Standards Association
under NRTL (North American) Standard.
• Canada , all field wiring shall conform to CAN/CSA
C22.1 Canadian Electrical Code, Part 1, and by local
codes, where they prevail.
• United States , all field 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 is: 120 VAC, 1 Ø, 60 Hz.
Factory Equipped Blower
Amps
1/3 and 1/2 HP 12
3/4 HP Belt Drive
and 1 HP Direct Drive
15
1 HP Belt Drive 20
• Accessories requiring 120 VAC power sources such
as electronic air cleaners and humidifier transformers
may be powered from furnace circuit, or from
electronic fan timer board where provisions have
been made for such connections, but should have
their own controls.
• Do not use direct drive motor connections as a power
source, there is risk of damaging accessories.
• Thermostat wiring connections are shown in wiring
diagrams in Appendix B. Some micro-electronic
thermostats require additional controls and wiring.
Refer to thermostat manufacturer's instructions.
• Locate thermostat approximately 5 feet above floor,
on inside wall, and where thermostat is exposed to
average room temperatures. Avoid locations where
thermostat is exposed to cold drafts, heat from
nearby lamps and appliances, exposure to sunlight,
heat from inside wall stacks, etc.
• Adjust thermostat heat anticipator to amperage
draw of heating control circuit as measured at "R"
and "W" terminals of thermostat. Do not measure
current with thermostat connected to the circuit.
Measure amperage by connecting ammeter between
two wires which connect to thermostat "R" and "W"
terminals.