035-20401-001 Rev. A (0904)
6
Unitary Products Group
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box as shown in
Figure 5. Make low voltage wiring connections inside the junction
box per Figures 7 - 9.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the corner cover and service access panel that were
removed in Steps 2 and 4 of the “Field Connections Power Wiring”
section.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
5.
Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors or supply air grilles.
6.
Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
NOTE:
To eliminate erratic operation, seal the hole in the wall at the
thermostat with permagum or equivalent to prevent air drafts
affecting the operation of in the thermostat.
DEHUMIDIFICATION CONTROL
A dehumidification control accessory 2HU06700124 may be used with
variable speed air handlers or furnaces in high humidity areas. This
control works with the variable speed indoor unit to provide cooling at a
reduced air flow, lowering evaporator temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts on
humidity rise. To install, refer to instructions packaged with the acces-
sory and Figures 7 - 9. Prior to the installation of the dehumidification
control, the jumper across the HUMIDISTAT terminals on the indoor
variable speed air handler or furnace CFM selection board must be
removed.
During cooling, if the relative humidity in the space is higher than the
desired set point of the dehumidification control, the variable speed
blower motor will operate at lower speed until the dehumidification con-
trol is satisfied. A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is recommended that a mini-
mum air flow of 325 cfm/ton be supplied at all times.
CFM SELECTION BOARD SETTINGS
For proper system operation the CFM Selection Board jumpers must be
set properly.
Refer to the Tabular Data Sheet for the recommended air flow settings
for each size condensing unit.
Set the cooling speed per the instructions for the air handler or furnace
by selecting the correct COOL and ADJ taps. Verify the airflow using
the LED display on the CFM selection board.
The HEAT PUMP jumper
MUST
be removed or in the “YES” position
for proper system operation.
The HUMIDISTAT jumper must also be removed or in the “YES” posi-
tion if a dehumidistat is installed.
FIGURE 6:
CFM Selection Board
CFM SELECTION BOARD
TAP SELECTION
D
C
B
A
D
C
B
A
COOL
HEAT
ADJ
DELAY
REMOVE FOR
HEAT PUMP
HUMIDISTAT
FIGURE 7:
Typical Variable Speed Air Handler Thermostat Wiring
FIGURE 8:
Typical Variable Speed Furnace Thermostat Wiring
FIGURE 9:
Typical Previous generation Variable Speed Furnace
Thermostat Wiring
VARIABLE
SPEED
AIR HANDLER
HEAT PUMP
CONTROL
C
Y1
R
W
O
G
C
Y1
R
O
C
Y1
R
W
O
Y2
Y
W2
W1
G
X/L
X/L
X/L
BSG
BS
Y2 OUT
W2 OUT
W1 OUT
1
2
1
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER ON CFM SELECTION BOARD MUST BE
.
HUMIDISTAT
REMOVED
2
Y1, Y2, X/L, AND HUM LOCATED ON CFM SELECTION BOARD.
JUMPER ON CFM SELECTION BOARD MUST BE
.
HEAT PUMP
REMOVED
THERMOSTAT
E
Y2
Y2
HUM
ORG
BLU/YEL
YEL
BLK
PUR
RED
BLU
GRY
BRN
WHT
1
VARIABLE
SPEED
FURNACE
HEAT PUMP
CONTROL
C
Y1
R
W
O
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER MUST BE IN
POSITION.
HUMIDISTAT INSTALLED?
YES
G
C
Y1
R
O
Y2/Y
W2
W1/W
G
HUM
X/L
X/L
2
HEAT PUMP SYSTEM
YES
JUMPER ON CFM SELECTION BOARD MUST
BE IN THE
POSITION.
1
2
THERMOSTAT
3
HEAT PUMP CONTROL
JUMPER MUST BE IN
POSITION.
FOSSIL FUEL
ON
Y2
C
Y1
R
W
O
Y2
X/L
BSG
BS
Y2 OUT
W2 OUT
W1 OUT
3
INDOOR
A-COIL
BLK
YEL
BLU/YEL
ORG
WHT
PUR
RED
BLU
GRY
BRN
* OPTIONAL
BONNET SENSOR
*
4
O, HUM, AND X/L LOCATED ON CFM SELECTION BOARD.
E
1
VARIABLE
SPEED
FURNACE
HEAT PUMP
CONTROL
C
Y1
R
W
O
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
JUMPER ON CFM SELECTION BOARD MUST BE
.
HUMIDISTAT
REMOVED
G
C
Y1
R
O
Y
W2
W1
G
HUM
X/L
X/L
2
HEAT PUMP
REMOVED
JUMPER ON CFM SELECTION BOARD MUST BE
.
1
2
THERMOSTAT
3
HEAT PUMP CONTROL
JUMPER MUST BE IN
POSITION.
FOSSIL FUEL
ON
Y2
C
Y1
R
W
O
Y2
X/L
BSG
BS
Y2 OUT
W2 OUT
W1 OUT
3
INDOOR
A-COIL
BLK
YEL
BLU/YEL
ORG
WHT
PUR
RED
BLU
GRY
BRN
* OPTIONAL
BONNET SENSOR
*
E
Y2
