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This multiple unit control board is an accessory used when
you need to control up to 3-units from a single thermostat.
The board is typically mounted in the unit control box clos-
est to the thermostat. A maximum of 2 boards may be used
together if up to 6-units must be connected and controlled
from a single thermostat.
This version of the board uses VAC relays and should not
be used in combination with any other accessories or
equipment that require VDC connections to the “G”, “W1”,
or “Y1” terminals (i.e. Boilerless System Kit).
The multiple unit control board provides the components
necessary to protect the Mark IV/AC board from electrical
damage that may occur when using standard off-the-shelf
relays.
Do not use the unoccupied (U-terminal) feature with the
multiple unit control board.
Multiple Unit Control (up to 3 units) (P/N 056794201)
Multiple Unit Control (up to 2 units) (P/N 106059801)
This multiple unit control board is an accessory used when
you need to control up to 2-units from a single thermostat.
The board is typically mounted in the unit control box clos-
est to the thermostat. The
“
G”, “W”, “Y”, “C”, and “L” con-
nections are short flying leads pre-attached to the board. A
maximum of 3 boards may be used together if up to 4-units
must be connected and controlled from a single thermostat.
This version of the board uses VDC relays and should not be
used in combination with any other accessories
or equipment that require VAC connections to the “G”,
“W1”, or “Y1” terminals (i.e. Boilerless System Kit). Do not
use the unoccupied (U-terminal) feature with the multiple
unit control board.
The multiple unit control board provides the components
necessary to protect the Mark IV/AC board from electrical
damage that may occur when using standard off-the-shelf
relays.
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