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6. Remove the control box cover and finish all indoor unit
wiring connections as shown on the wiring diagram or in
the accessory installation instructions. Replace the control
box cover.
7. Lubricate the end of the pipe and thread of the flare connec-
tion with refrigerant oil. Tighten by hand and then use two
wrenches (see Fig. 42) to tighten all connections.
Adjustable wrench or torque wrench
Outdoor end
Indoor end
Fig. 42 - - Tightening Connections
START- - UP
Preliminary Checks
1. Check condensate drainage system; on the opposite side of
the drain connection, insert a water bottle up into the fan
coil unit and fill the drain pan. Water must flow steadily; if
not, check the pipe slope or inspect for any pipe restrictions.
2. Make sure all wiring connections are correct and they are
tight.
3. Field electrical power source must agree with unit name
plate rating.
4. Check that all barriers, covers, and panels are in place. En-
sure that the filters and return- -air grilles on the indoor unit
have been installed and that the discharge louvers are posi-
tioned correctly.
5. All service valves must be closed.
6. On units with crankcase heaters, ensure belly- -band heaters
are tight around the compressor.
Evacuate and Dehydrate the System
CAUTION
!
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.
Using Vacuum Pump
1. Completely tighten flare nuts A, B, C, D, connect manifold
gage charge hose to a charge port of the low side service
valve (see Fig. 43).
2. Connect charge hose to vacuum pump.
3. Fully open the low side of manifold gage (see Fig. 44).
4. Start vacuum pump
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for up
to 25 ft. (8 m) of line length. For refrigerant lines longer than
25 ft (8 m), add charge up to the maximum allowable length
as specified in the Residential Long Line Application Guide.
1
3
2
8. Disconnect charge hose from charge connection of the low
side service valve.
9. Fully open service valves B and A.
10. Securely tighten caps of service valves.
Outdoor Unit
Service Valve
A07201
500 microns
Low side valve
Charge hose
Low side valve
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water (see Fig. 45).
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
20
Refrigerant
Low Side
A
B
High Side
Fig. 43 - - Service Valve
Manifold Gage
High side valve
Charge hose
Vacuum pump
Fig. 44 - - Manifold
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
1
2
3
4
5
6
MINUTES
Fig. 45 - - Deep Vacuum Graph
Indoor Unit
C
D
A07360
A07361
7
A95424
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