Table of Contents
Advertisement
• 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.
• ECM Blower note - Single stage cooling use terminal Y/Y2.
Two stage cooling use terminal Y1 for first stage and Y/Y2
for second stage. When Y1 is energized, air flow is reduced
by 20%. Do not use terminal Y1 with single stage cooling or
heat pump.
• 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.
15. Humidifier
• Humidifier is optional accessory available through most
heating supplies outlets.
• Follow humidifier manufacturer's installation instructions
• Protect furnace heat exchanger from water or water droplets
from humidifier.
• Do not use direct drive motor connections as source of
power for 120 VAC humidifiers and humidifier transformers.
16. Piping Installation
• Install fuel system in accordance with requirements of CAN/
CSA B-139, and local regulations.
• United States installation shall conform to NFPA No. 31 and
local codes and authorities.
• Use only approved fuel oil tanks, piping, fittings and oil filter.
• Install oil filter as close to burner as possible.
• Refer to instructions and illustrations in oil burner and oil
pump instructions shipped with the furnace.
17. Oil Filter
Install oil filter between fuel oil storage tank and oil burner. When
using oil burner nozzle smaller than 0.65 U.S. Gallons Per Hour,
install additional 7 to 10 micron filter as close as possible to oil
burner.
18. Oil Burner Nozzles
Furnaces are certified for multiple firing rates. Furnace may be
fired at ideal rate for wide range of structures by manipulating oil
burner setup and blower settings. Refer to Table A-1 thru A-9, and
furnace rating plate to determine proper combinations. Nozzles for
alternate firing rates are included with furnace.
19. Oil Burner Adjustment
• Adjust burner air supply to maintain fuel to air ratio to obtain
ideal combustion conditions.
• Lack of air causes "soft" and "sooty" flames, resulting in soot
build-up throughout heat exchanger passages.
• Excess combustion air causes bright roaring fire and high
stack temperatures resulting in poor fuel efficiency.
• UMLA and UMLVA operate most efficiently with No. 1 smoke
spot on Bacharach Scale. Dust will eventually build up on
air moving components of oil burner assembly resulting in
decreased air supply with potential soot build up in flue gas
passageways of heat exchanger. Soot behaves as insulator
and impairs good heat transfer. Stack temperature increases,
and efficiency decreases. To avoid this problem, adjust the air
supply as follows:
◊ Chimney vented units - adjust air supply to provide no
more than a trace smoke spot on the Bacharach scale.
◊ Direct vented units - adjust air supply for zero smoke per
the Direct Vent Installation, Operation and Maintenance
Manual included with the direct vent furnace.
20. Burner Electrodes
Correct positioning of electrode tips with respect to each other,
fuel oil nozzle, and burners is essential for smooth light ups and
proper operation.
Refer to oil burner instructions provided with furnace and
Appendix A Section A.2 in this manual for electrode specifications.
Do not tamper with furnace controls they are sensitive.
If problems persist, call your service contractor.
21. Burner Primary (Safety) Control
Furnace is equipped with primary combustion control, also
referred to as burner relay or burner protector relay, which uses
a cad cell located in burner housing, to monitor and control
combustion.
Dust or combustion residuals can build up on lens of cad cell
impairing its response to flame. Check cad cell for cleanliness
and proper alignment if primary control frequently shuts down
combustion.
9
NOTICE
PN 240010964 Rev. L [10/01/2021]
Advertisement
Table of Contents
Troubleshooting
