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6
turns it off.
To select alternate relays does not change the element LED display.
The power supply wire and the element wire must be moved to the replacement
relay position.
Refer to Fig 1 and Fig 2.
COOLING DISCHARGE AIR SENSOR
A/C COIL INSTALLED DOWNSTREAM
The following must be observed when the A/C coil is mounted downstream of the
furnace and the modulation mode of cooling is desired.
Note, all furnaces are factory supplied with the modulation mode selected.
If air conditioning is not installed simply leave sensor safely coiled up in control
compartment.
The cooling discharge air sensor must be installed approximately 15” downstream
of the A/C coil.
Drill a 3/8” diameter hole in the supply duct, install plastic Heyco bushing
provided, insert sensor at least 2” into supply duct and secure sensor in place
using plastic clip provided
Refer to fig.6.
A/C COIL INSTALLED UPSTREAM OF FURNACE
(OPTIONAL RETURN AIR SENSOR)
Recommended for Heat Pump applications.
The following must be observed when the A/C coil is installed upstream of the
furnace.
Locate air filter upstream of A/C coil.
The return air temperature must be monitored to permit the controller to function.
To do this, the return air sensor must be installed in the return air duct upstream of
the A/C coil.
Disconnect the “Disc Air Rem” sensor connector from the controller and connect
on to “Ret Air Rem” receptacle on controller and route to outside of cabinet
through sleeved holes provided. Do not route sensor leads through the same
openings as the power leads. Sensor leads must be routed away from power leads.
Drill a 3/8” diameter hole in the return air duct approximately 18” upstream of the
A/C coil. Insert the Heyco bushing provided into the hole.
Insert the sensor lead end into the return air duct approximately 2” and secure into
place using the plastic clip provided.
Refer to fig.6.
Summary of Contents for ALPHA
Page 9: ...9 Fig 2 MAIN CONTROL BOARD ...
Page 11: ...11 Fig 4 ...