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5. I
N
NSTALLATION
OTES
5.1 C
A
R
OLD
IR
ETURN
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.
5.2 E
W
LECTRICAL
IRING
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: When a FK120 ECM kit is used to supply an air cleaner and/or humidifier, a third (neutral) conductor must be brought into the furnace.
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.
5.3 C
ONNECTING AND
Attach thermostat wires to the low voltage terminal block located on the inside of 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.
Before turning the furnace on, the heat anticipator in the thermostat must be properly set.
Because each installation is different an accurate reading of the current draw should be made with an AC meter. Set the meter at 2 A range for
furnaces through 20 kW, and at 4 A range for larger units.
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.
6. U
M
SE IN
OBILE
Models 21ECM10, 21ECM15, 21ECM18 & 21ECM20 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).
All manuals and user guides at all-guides.com
- P
S
OWER
UPPLY
A
L
V
DJUSTING THE
OW
OLTAGE
H
OMES
!
WARNING
T
(Use only class 1 wires inside furnace compartments.)
HERMOSTAT
CAUTION
SHALLOW DUCT AREA REQUIREMENTS
D
D
UCT
EPTH
4" (102 mm)
5" (127 mm)
6" (152 mm)
- 6 -
D
W
UCT
IDTH
16" (406 mm)
13" (330 mm)
10" (254 mm)
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