Broan 30042432A Installation Notes, For Use In Mobile Homes, Shallow Duct Area Requirements

INSTALLATION NOTES

1.COLD AIR RETURN

The duct can be attached to either side, rear or the bottom of the furnace.

For side return there are four 1½” (38 mm) knockouts which can be removed and used as an outline for cutting a 18” x 18” (457 mm x 457 mm) return air opening in the furnace left or right side. Mount the filter frame to the furnace over the opening with the open side of the frame facing front. Then attach the 19” x 19” (483 mm x 483 mm) air duct to the flanges on the filter frame. For bottom mounting, remove the screws holding the bottom plate to the furnace, discard the bottom plate and attach the filter frame to the bottom flanges with the open side of the frame facing front.

3.CONNECTING AND ADJUSTING THE LOW VOLTAGE THERMOSTAT

(Use only class 1 wires inside furnace compartments.) Attach thermostat wires to the low voltage terminal connections located on the printed circuit board inside the furnace. Follow the diagrams supplied with the thermostat. As a general guide, remember that the R & W terminals control single stage heating; the R & Y terminals control cooling. Single stage cooling uses “Y/Y2” as first and only stage.

Two-stage cooling uses “Y1” as first stage and “Y/Y2” as second stage. Make sure the thermostat is levelled on the wall and in appropriate location as per instructions supplied with the thermostat.

2.ELECTRICAL WIRING - POWER SUPPLY

The furnaces are completely factory wired. From a separate breaker, a two-wire plus ground supply wire is required. The ground conductor must be firmly attached to the ground lug in the furnace and the supply wires to the terminal block in the furnace.

NOTE: If a FK120 kit will be used to supply an air cleaner and/or humidifier, a third (neutral) conductor must be brought into the furnace.

!WARNING

For all installations, we only recommend appropriate gauge good quality copper wire(s). However, it is the electrician’s responsibility to ensure that the wiring and connections are compliant to the latest editions of the Canadian Electrical Code and local codes.

CAUTION

Before turning the furnace on, the heat anticipator in the thermostat must be properly set to prevent its failure and to assure comfortable, economical heating.

Because each installation is different an accurate reading of the current draw should be made with an AC meter. Set the meter at a 2 A range.

A.Set the anticipator at its highest setting.

B.Disconnect the “W1” thermostat wire from the furnace low voltage terminal connections.

C.Connect the AC meter between the “W1” terminal on the board and the loose “W1” wire.

D.Turn the thermostat up to start the furnace and allow it to run, with all elements on, for three or four minutes.

E.Read the current draw on the meter and reset the anticipator to match the meter reading.

FOR USE IN MOBILE HOMES

D Series furnaces models 21D10, 21D15, 21D18 and 21D20 are certified for “L” -shape and “T”-shape shallow duct installation with model FSB-1 sub-base in downflow applications when the supply air ducts pass through the floor of the structure. Recommended size of a floor opening: 14¼” x 14¼” (362 mm x 362 mm). The duct system must be designed so that the external static pressure of the system does not exceed the maximum external static pressure of 0.50” W.C. (125 Pa).

SHALLOW DUCT AREA REQUIREMENTS

Duct Depth	Duct Width
4” (102 mm)	16” (406 mm)
5” (127 mm)	13” (330 mm)
6” (152 mm)	10” (254 mm)

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