IM-KSAIC03-02 Specifications subject to change without notice. 7
Scenario No. 4:
Single Zone outdoor unit 38MA*R with approved multi-family 24V
fan coils FMA/FMC/FMU. (For proper combinations consult the
compatibility chart in the “APPENDIX 1 - COMPATIBILITY
CHART” on page 14).
Installation Steps:
1. Remove TXV/Piston on the indoor unit.
2. Run interconnecting piping from outdoor to indoor using Outdoor
piping size and brazing to the adapter for the mechanical fitting
from which the TXV was removed (Part number 331831-701)
(available through RCD). If required, use the Bushing / Reducers
listed on “APPENDIX 2 - PIPING ADAPTER BUSHINGS/RE-
DUCERS” on page 15.
3. Suction and liquid refrigerant lines must be properly insulated and
separated from each other to prevent condensation and energy loss.
4. Disconnect and remove the 24V transformer from the 24V interface
kit. Run 2-conductor wire from 24 volt side of the Indoor Unit
transformer to CN16 and CN17.
5. Run interconnecting wiring from outdoor unit to 24V interface
using terminal connections L1, L2, S and G.
6. Run thermostat wiring from thermostat to 24V interface using
connection R and C on CN15 and Y, W, G on CN19.
7. Run thermostat wiring from 24V interface to indoor unit using
output connections G1 (Low), G1+G2 (Medium), G1+G2+G3
(High) on the 24V interface and connect according to the
installation manual for these fan coils.
8. Install the T1 sensor on CN5 on the 24V interface and place on the
return of the indoor unit.
9. Configure the dip switches on the 24V interface accordingly.
NOTES: Follow the Indoor and Outdoor unit's general
installation instructions.
The T1 (Return air temperature) sensor should be near or on the
unit and on the air inlet side. The thermistor should be installed
pointing down into the duct between 2.5ft. (0.762m) and 4ft.
(1.2m) from the return side of the fan coil. Use a 1/2” drill and
insert the thermistor no less than 6 in. into the duct and seal air
tight around cable.
Fig. 12 —Wiring Diagram for Conventional 24V Fan Coil indoor unit
When the outdoor unit is matched with a Multi-Family or Residential
Fan Coil and due the need to braze the piping on the fan coil side it is
REQUIRED to flow Nitrogen in the system while brazing the line set
since a filter drier is not recommended to be used with these
condensing units.
CAUTION
Thermostat
70
Transformer
L1
L2
G
G
G
G
Red dash mea
disconnect
Power supply from outdoor unit disconnect.
Two wires are line voltage and the other is a
ground wire.
Power supply from indoor
unit disconnect
1 2 3 4 5
NG
LC
BUS BAR
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