Control Board; Twinning - Nordyne B6EM Series Installation Instructions Manual

fireplaces, sunlight, or lighting fixtures, and convective
heat from warm air registers or electrical appliances.
Refer to the thermostat manufacturer's instruction sheet
for detailed mounting and installation information.
• Install the grommet, which is packed with the unit, in
the hole for low-voltage wires. Properly connect the
low-voltage wiring between the thermostat, outdoor
unit, and control board. NOTE: When the low voltage
wires are positioned in this grommet, the grommet will
prevent chafing and/or shorting of the low voltage leads.
Thermostat
W Y G R
Air
Handler
W1
Conditioner
Y
G
R
C
Typical Air Conditioner with
Standard Air Handler
Thermostat
W2
O Y
G R C E
NOTE: Jumper between
Air
W2 & E is required when
Handler
no OD T-Stat is used.
W1
Y
G
R
C
Typical Heat Pump with
Standard Air Handler
12
NOTE: Jumper W1 & W2
together if not using W2
on thermostat
Y1
W2
W1
O
Air
Y/Y2
G
Y
R
C
Air
C
Handler
Typical Air Conditioner with
Variable Speed Air Handler
NOTE: Jumper W1 & W2
together if not using W2
on thermostat
Y1
W2
W1
O
O
W2
Y/Y2
Y
G
R
R
C
C
Air
Heat Pump
Handler
Typical Heat Pump with
Variable Speed Air Handler
Figure 9. Typical Thermostat Connections

Control Board

The control board in the air handler controls the timing
sequence of the elements. The board is equipped with a 3
second blower on delay and a 15 second blower off delay
in heating and a 40 second blower off delay in cooling.
See Figures 13 or 14 (page23) and Table 12 (pages 29-
30) for control board modes and actions.

Twinning

B6BM air handlers are not supplied with a built in twinning
capability. To connect two air handlers to a common
single stage AC condensing unit or heat pump, a twinning
kit is available for field installation. Please follow the
instructions supplied with the kit.
Thermostat
W Y G R
Air
Conditioner
Y
C
Thermostat
W2
O Y G R C W/E
W2
O
Y
R
C
Heat Pump
Thermostat
W2
Y1 W/E Y2 G R
Y1
W2
W1
O
Y/Y2
G
R
C
Air
Handler
Typical 2-Stage Air Conditioner
with Variable Speed Air Handler
Thermostat
W/E
O G R C
Y1 W2 Y2
Y1
W2
W1
O
Y/Y2
G
R
C
Air
Handler
Typical 2-Stage Heat Pump with
Variable Speed Air Handler
Air
Conditioner
Y1
Y2
R
C
Y1
W2
O
Y2 OUT
R
C
Heat Pump