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The filter frame shall be installed on the side of the cabinet selected for the return
air to enter the furnace; either side or bottom. NOT IN BACK OF CABINET.
Four knockouts are provided on each of the two sides and bottom of the furnace
to locate R/A opening.
FEATURES
All models are completely pre - wired.
All “ field “ wiring shall be completed by the Installer to the terminal block
provided on the main control board in the furnace.
INSTALLATION CLEARANCES FURNACE
As shipped the ALPHA series furnaces are Certified for “ZERO” clearance.
To facilitate servicing the unit, the “Front” clearance should be a minimum
of 24”.
OPERATING SEQUENCE
HEATING
The thermostat closes the R-W1/W2 circuit, - activating the controller and
elements one by one. The blower starts at low speed at the same time as the first
two elements come on.
Blower speed increases as the other elements turn on.
Furnace is factory set in modulation mode.
If modulation has been selected at the controller, the blower speed with adjust
automatically to maintain the factory set discharge air temperature.
If modulation has not been selected, the blower will run at the factory set
heating speed.
When the thermostat is satisfied, all elements turn off at once and the blower
continues to run until either the preset discharge temperature is met or 1 minute,
which ever occurs first.
Refer to fig.2 to select modulation.
Position 1 on switch SW2 turns heating modulation on and off.
COOLING
The thermostat closes the R-Y/G circuit,
thereby activating compressor relay. The blower starts at cooling speed.
Furnace is factory set in modulation mode.
If modulation is selected at the controller, the cooling sequence starts first at high
speed blower for approximately 7 minutes (sensible mode) followed by
approximately 7 minutes of lower speed blower (latent mode). This sequence repeats.
If modulation is deselected, cooling speed is fixed at high speed.
Refer to fig.2, SW2 position 2 to turn modulation ON or OFF.
Summary of Contents for ALPHA
Page 9: ...9 Fig 2 MAIN CONTROL BOARD ...
Page 11: ...11 Fig 4 ...
