Nortron B SERIES Installation And Operating Instructions Manual - page 4
4
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.
2. ELECTRICAL WIRING - POWER SUPPLY
The furnaces are completely factory wired. From a separate
breaker, a two-wire plus ground supply wire is required for
single phase units, and a three-wire plus ground supply wire for
three phase units. 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: On single-phase furnaces, when a FK120 kit is used to
supply an air cleaner and/or humidifier, a third (neutral)
conductor must be brought into the furnace.
3. CONNECTING AND ADJUSTING
THE LOW VOLTAGE THERMOSTAT
(Use only class 1 wires inside furnace compartments.)
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.
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.
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.
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.
FOR USE IN MOBILE HOMES
Models 21B10M, 21B15M, 21B18M & 21B20M 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)