43
Install all Power, Interconnecting Wiring, and
Piping to Indoor Unit.
1 Run the interconnecting piping and wiring from the outdoor
unit to each indoor unit (in matched pairs) (except sizes 48
and 56 refer to the Branch Box installation instructions).
2 Pass the interconnecting cable through the hole in wall
(outside to inside).
3 Lift the indoor unit into position and route the piping and
drain through the hole in wall (inside to outside). Fit the
interconnecting wiring into the back side of the indoor unit.
4 Hang the indoor unit on the upper hooks of the wall
mounting plate (see Fig. 85).
A08283
Fig. 85 – Hanging Indoor Unit
5 Open the indoor unit’s front cover and remove the field
wiring terminal block cover (see Fig. 86).
Field Wiring
Cover
Interconnecting
Cable
A08279
Fig. 86 – Field Wiring Cover
6 Pull the interconnecting wire up from back of the indoor
unit and position in close to the terminal block on the
indoor unit.
7 Push the bottom of the indoor unit onto the mounting plate
to complete the wall mount.
8 Connect the wiring from the outdoor unit per the
connection diagram (see Fig. 82).
NOTE: Polarity of power wires must match original
connection on outdoor unit.
9 Replace the field wiring cover and close the front cover of
the indoor unit.
10 Connect the refrigerant piping and the drain line outside of
the indoor unit. Refer to Piping Connections to Outdoor
Unit section and Fig. 77 for proper installation of the flare
connections. Complete the pipe insulation at the flare
connection then fasten the piping and wiring to the wall as
required. Completely seal the hole in the wall.
11 Repeat steps 1 through 10 for each indoor unit.
System Vacuum and Charge
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
CAUTION
!
Refrigerant tubes and the indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
Using Vacuum Pump
1 Completely tighten the flare nuts A, B, C, D, (for all fan
coils). Connect the gage charge hose to one circuit or all
circuits (if using a multiple connection manifold) at the low
side service valve charge port(s) (see Fig. 87).
2 Connect the charge hose to the vacuum pump.
3 Fully open the low side of the manifold gage (see Fig. 88).
4 Start the vacuum pump.
5 Evacuate using either the deep vacuum or triple evacuation
method.
6 After the evacuation is complete, fully close the low side of
the manifold gage and stop the vacuum pump operation.
7 If the multiple connection manifold is not used, repeat the
procedure (1 through 6) until all indoor units and piping are
completely vacuumed.
8 The factory charge contained in the outdoor unit is suitable
for maximum pipe length. If an additional charge is
required, it should be added to the system as liquid at this
time.
9 Disconnect the charge hose from the charge connection of
the low side service valve.
10 Fully open all the service valves.
11 Securely tighten the service valves caps.
Outdoor Unit
Indoor Unit
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 87 – Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 88 – Manifold