IM-KSAIC03-02 Specifications subject to change without notice. 9
Scenario No. 5:
Single Zone outdoor unit 38MA*R with approved residential 24V fan
coils. (For proper combinations consult the compatibility chart in
“APPENDIX 1” on page 14).
Installation Steps:
1. Remove TXV on the indoor unit.
2. Run interconnecting piping from outdoor to indoor using Outdoor
piping size and brazing to the mechanical fitting adapter that
replaces the TXV (part number 331831-701) (available through
RCD). If required, use the Bushing / Reducers listed on
“APPENDIX 2 - PIPING ADAPTER BUSHINGS/REDUCERS”
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 24 volt transformer from the 24 Volt
Interface. Run 2-conductor 18 AWG cable from R and C of the
indoor unit terminal board. Connect “R” to CN17 and “C” to CN16
on the 24 Volt Interface. Be sure to connect the primary (high
voltage) wire to the correct terminal (tap) on the FV4C transformer
(see Appendix 3).
5. Run interconnecting wiring (14-3 AWG stranded power cable with
ground and 600 volt insulation rating) from outdoor unit to 24 Volt
Interface using terminal connections L1, L2, S, and G. Connect
ground wire G to the grounding connection in the case.
6. Run 18 AWG thermostat wiring from thermostat terminals to the 24
Volt Interface and connect to R and C on CN15. Also connect Y, W,
and G on CN19. NOTE: Use an instrument size flat blade
screwdriver with a maximum blade width of 1/8” for the screw
terminals.
7. Run 18 AWG thermostat wiring from “G1” on CN18 of the 24 Volt
Interface to “G” on the indoor unit terminal board.
8. Install the T1 sensor (included with 24 Volt Interface) on CN5 of
the 24 Volt Interface and locate according to the NOTE, below.
9. Configure the dip switches on the 24 Volt Interface for proper
operation:
For Heat Pump – all switches OFF except SW1-1 = ON
For Cooling Only – all switches OFF except SW1-1 = ON and
SW2-1 = ON.
10. Configure the Fan Coil "Easy Select" Printed-Circuit Board
following the instructions on the installation manual of the indoor
unit.
NOTES: Follow the Indoor and Outdoor unit’s general
installation instructions.
The T1 (Return Air Temperature) sensor should be near or on the
indoor unit on the air inlet side. The thermistor should be
installed pointing down into the duct between 2.5 ft (0.75 m) and 4
ft (1.2 m) from the return side of the fan coil. Use a ½” drill and
insert the thermistor no less than 6 in (15 cm) into the duct and
seal air tight around the cable.
Fig. 14 —Wiring Diagram for FV4C Fan Coil 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
G
G
G
G
FV4C
Indoor Unit
L1
L2
24V
D
H
R
W
1
W
2
Y
1
YY
1
G
O
C
disconnect
Power supply from outdoor unit disconnect.
Two wires are line voltage and the other is a
Power supply from indoor
unit disconnect
BUS BAR
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