Maytag POF1HD091AVFA, Installation, Operation And Maintenance Manual

7.  BAROMETRIC DAMPER CONTROL. 

The barometric damper control, also known as a draft 
regulator, is used on conventional chimney venting only. 
This control automatically maintains a constant negative 
pressure in the furnace to obtain maximum efficiency. It 
ensures that proper pressures are not exceeded. If the 
chimney does not develop sufficient draft, the draft 
control cannot function properly. The draft regulator, 
when installed should be in the same room or enclosure 
as the furnace and should not interfere with the 
combustion air supplied to the burner. The control should 
also be located near the furnace flue outlet and installed 
according to the instructions supplied with the regulator. 
The flue outlet pressure (measured between the furnace 
and draft regulator, or the oil burner mounting plate over-
fired draft access port.  fig. 2) should be set to -0.02 in. 
w.c. 

9.

FAN TIMER BOARD AND LIMIT CONTROL

(FIG. 4) (page 19) 

The 

United Technologies 1168-1 ECM 

(POF1HD140AVFA and POF1HD091AVFA) 

tap board 

has an adjustable fan on/off delay that must be adjusted 
in accordance with the furnace input rating (nozzle size).  
Refer to Table A-10 (pg 15) for ECM blower set-up.

10.  ELECTRICAL CONNECTIONS 

The furnace is listed by the Canadian Standards 
Association under the NRTL (North American) Standard. 
It is factory wired and requires minimal field wiring. All 
field wiring should conform to CAN/CSA C22.1 Canadian 
Electrical Code, Part 1, and by local codes, where they 
prevail. In the United States, the wiring must be in 
accordance with the National Fire Protection Association 
NFPA-70, National Electrical Code, and with local codes 
and regulations. 

The furnace should be wired to a separate and dedicated 
circuit in the main electrical panel; however, accessory 
equipment such as electronic air cleaners and 
humidifiers may be included on the furnace circuit. 
Although a suitably located circuit breaker can be used 
as a service switch, a separate service switch is 
advisable. The service switch is necessary if reaching 
the circuit breaker involves becoming close to the 
furnace, or if the furnace is located between the circuit 
breaker and the means of entry to the furnace room. The 
furnace switch (service switch) should be clearly marked, 
installed in an easily accessible area between the 
furnace and furnace room entry, and be located in such a 
manner to reduce the likelihood that it would be mistaken 
as a light switch or similar device. 

The power requirement for the POF1HD140AVFA and 
POF1HD091AVFA models is: 120 VAC, 1 Ø, 60 Hz., 
12A. 

Accessories requiring 120 VAC power sources such as 
electronic air cleaners and humidifier transformers may 

be powered from the electronic

fan timer board 

where provisions have been made for connections, 
but should have their own controls. Do not use the 
direct drive motor connections as a power source, 
since there is a high risk of damaging the 
accessories by exposure to high voltage from the 
auto-generating windings of the direct drive motor. 

Thermostat wiring connections and air conditioning 
contactor low voltage connections are shown in the 
wiring diagrams in Appendix B. Some micro-
electronic thermostats require additional controls 
and wiring. Refer to the thermostat manufacturer's 
instructions. 

The thermostat should be located approximately 5 
feet above the floor, on an inside wall where there is 
good natural air circulation, and where the 
thermostat will be exposed to average room 
temperatures. Avoid locations where the thermostat 
will be exposed to cold drafts, heat from nearby 
lamps and appliances, exposure to sunlight, heat 
from inside wall stacks, etc. 

The thermostat heat anticipator should be adjusted 
to the amperage draw of the heating control circuit 
as measured at the "R" and "W" terminals of the 
thermostat. To reduce the risk of damaging the heat 
anticipator, do not measure this current with the 
thermostat connected to the circuit. Measure the 
amperage by connecting an ammeter between the 
two wires that will connect to the thermostat "R" and 
"W" terminals.

11.  HUMIDIFIER 

A humidifier is an optional accessory available 
through most heating supplies outlets. Installation 
should be carried out in accordance with the 
humidifier manufacturer's installation instructions. 
Water or water droplets from the humidifier should 
not be allowed to come into contact with the furnace 
heat exchanger. Do not use direct drive motor 
connections as a source of power for 120 VAC 
humidifiers and humidifier transformers. 

12.  PIPING INSTALLATION 

The entire fuel system should be installed in 
accordance with the requirement of CAN/CSA B-
139, and local regulations. Use only an approved 
fuel oil tanks piping, fittings and oil filter. 

In the United States the installation must be in 
accordance with NFPA No. 31 and local codes and 
authorities. 

Install the oil filter as close to the burner as possible. 
For further details of the oil supply tank and piping 
requirements, please refer to the instructions and 
illustrations in the oil burner and oil pump 
instructions shipped with the furnace. 

5