Specifications

4 IM 685-2
Figure 2. Wind Deflector (Models 032 thru 140)
Electrical
The McQuay burner receives its electrical power from the
main unit control panel. No additional power wiring must be
routed to the burner. The sequencing of the burner is also
controlled through this panel and therefore is factory wired.
No additional wiring will be required. Note that models 150
through 200 furnaces require reassembly of some electrical
connections as the burner is removed for shipment.
Gas Pressure Requirements
The pressure furnished to the combination gas control(s)
must not exceed 13.9 in. W.C. When the supply pressure is
above 13.9 in. W.C., a high pressure regulator must precede
the combination gas control(s). The inlet gas pressure cannot
exceed the maximum pressure rating of the high pressure
regulator and the outlet pressure must be such that it will
furnish gas to the appliance pressure regulator within the
pressure range mentioned above, preferably at 7.0 in. W.C.
when firing at maximum rate.
Gas Piping
The connection size at the burner is shown in Table 7 under
Column 13 thru 15. Gas piping must be sized to provide the
minimum required pressure at the burner when the burner is
operating at maximum input. Consult the appropriate local
utility on any questions on gas pressure available, allowable
piping pressure drops, and local piping requirements.
Install all piping in accordance with the National Fuel Gas
Code (ANSI Z223.1), (NFPA 54-1999) and any applicable
local codes.
It is very important that the proper size piping be run from
the meter to the gas burner without reductions. Undersized
piping will result in inadequate pressure at the burner. The
pressure will be at its lowest when it is needed the most, at
times of maximum demand. Therefore, it can cause intermit-
tent hard-to-find problems because the problem may have
left before the service technician has arrived. Avoid the use
of bushings wherever possible.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, severe per-
sonal injury or death. Read the installation, operating
and maintenance instructions thoroughly before install-
ing or servicing this equipment.
If you smell gas:
1. Open windows and ventilate area thoroughly.
2. Don’t touch electrical switches.
3. Eliminate open flames, pilot lights, arcing or sparking
equipment, or other sources of ignition.
4. Evacuate the area.
5. Immediately call your gas supplier from a different
area.
Do not use and store gasoline or other flammable
vapors or liquids in open containers near this appliance
or in areas sharing ventilation with it.
1
Figure 1. Flue Box
Tube Ends
Flue Box
Wrap
Flue Box
Tube Sheet
Wind Deflector
Hinge Inner
Screw
Burner
Access
Door
4
3
Wind Deflector (see Figure 2)
The wind deflector is not installed at the factory because it
would increase the width of the unit beyond the allowable
shipping width. The deflector is shipped in a box in the
burner section. Install the wind deflector over the combustion
air intake opening of the burner compartment before operat-
ing the burner. Use inner hinge screws on top hinged door.
Side hinged doors have holes for mounting (see Figure 5).
Models 020 and 025 have a different style wind deflector. It
mounts on the door and has a top opening flush with the roof
of the unit (see Figure 14).