IM-KSAIC03-03 Specifications subject to change without notice.
11
WIRING
All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. Use the Electrical Data
table MCA (minimum circuit amps) and MOCP (maximum over
current protection) to correctly size the wires and the disconnect fuse
or breakers respectively. Consult the unit’s installation instructions for
the Electrical Data tables.
For scenarios 1, 2 and 3 Ductless Systems
- The main power is
supplied to the outdoor unit; the indoor unit is powered by the 24V
interface.
For scenarios 4 and 5
Conventional Fan Coils
- Separate power
supplies are required for the outdoor unit and the indoor unit.
For condensing units with a L1, L2 and S power and
communication wiring -
The field supplied 14/3 stranded wire with
ground and a 600 volt insulation rating, power/communication wiring
from the outdoor unit to the 24V Interface Kit, consists of four (4)
wires and provides the power for the 24V Interface. Two wires are line
voltage AC power, one is communication wiring (S) and the other is a
ground wire.
For condensing units with a L1, L2, S1 and S2 power and
communication wiring, the field supplied power wiring 14/2 from the
outdoor unit to the 24V interface consists of three (3) wires and
provides the power for the indoor unit. Two wires are high voltage AC
power and one is a ground wire. To minimize voltage drop, the factory
recommended wire size is 14/2 stranded with a ground.
A separate shielded 16GA stranded control wire copper conductor
only, with a 600 volt rating and double insulated copper wire, must be
used as the communication wire from the outdoor unit to the 24V
interface and the indoor unit.
Wiring between the outdoor unit to 24V Interface Kit is polarity
sensitive. The use of the BX wire is
NOT
recommended.
Key Considerations When Using a Conventional
Fan Coil
The following steps should be taken when using this device with a
conventional fan coil unit (scenarios 4 and 5):
1. Indoor coil metering device (TXV/Piston) must be removed
2. The 24V transformer in the interface module must be disconnected
3. The refrigerant charge amount may need adjusting, depending on
the pipe size and length. Refer to the outdoor unit’s installation
manual.
4. The maximum airflow should not exceed 400 CFM/Ton.
When the indoor fan coil has its own 24V AC transformer, all four wires
of the 24V Interface kit transformer must be disconnected (see Fig. 17).
The suction and liquid refrigerant lines must be properly insulated to
prevent condensation and energy loss.
Fig. 16 — Wiring
Fig. 17 — Wiring
Control Logic
Table 5 — Conventional Thermostat Connections
Table 6 — Mode Setting
FAN SPEED
For Ductless systems (scenarios 1-3) the fan speed defaults to
AUTO
.
For conventional fan coils (scenarios 4-5), the fan speed can be
selected, refer to
“APPENDIX 1 - COMPATIBILITY AND FAN
The fan outputs are
G1 (1st),
G1+G2
(2nd), and
G1+G2+G3
(3rd). For the single fan speed only,
G1
has to be connected.
Use the selection options provided to adjust the airflow supplied to
meet the individual installation needs for such things as noise,
comfort, and humidity removal.
Table 7 — Fan Speed Setting
LEGEND
The conventional thermostat must be configured for use with a single
stage air conditioner (Y output
ONLY
) and a single stage heating (W)
system.
CAUTION
Connector
Purpose
R/C
24VAC Output
Y
Cooling
W
Heating
G
Fan
AUX/DRY
Aux/Dry Mode
Y
W
G
Aux/Dry
Setting Mode
X
☆
☆
Cooling
X
☆
X
Heating
X
X
X
Fan only
☆
☆
OFF
X
X
X
X
OFF
X
X
☆
DRY Mode (on Ductless Systems)
Unit ON/OFF
G
Setting Fan Speed
X
Auto Fan Speed
Auto Fan Speed
X
X
Fan OFF
ON
X
OFF
☆
ON or OFF
Only the approved combinations and fan coil model numbers listed in the
“APPENDIX 1 - COMPATIBILITY AND FAN SPEED WIRING” on
page 15 shall be used to avoid any damages to the fan motor.
The use of a fan coils with a PSC motor is not recommended or approved.
CAUTION