21
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water.
Refer to Fig. 46 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr. Dur-
ing this time, dry nitrogen will be able to diffuse throughout
the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 46. System will
then be free of any contaminants and water vapor.
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
RELEASE CHARGE INTO SYSTEM
BREAK VACUUM WITH DRY NITROGEN
EVACUATE
WAIT
A95425
Fig. 46 -- Triple Evacuation Method
To Start the Unit:
1. If the outdoor unit is equipped with a crankcase heater, turn
on the indoor and outdoor disconnect switches to supply
power to the system 6 hours before starting the system.
2. Release charge into the system by opening (back--seating)
liquid and suction line service valves.
3. Set the wireless remote control or wired remote control be-
low ambient temperature. Operate the unit for 15 minutes.
4. Refer to Table 12 to determine if additional charge is re-
quired. Also, if you have a long line application, refer to the
Residential Long Line Application Guide to determine the
additional charge that is required beyond 25 ft (7.6 m).
5. Charge should be added as liquid (not gas) slowly and care-
fully to low side to avoid liquid slugging.
6. Start unit with operation test. In test mode the unit will run
in cooling and heating (on heat pumps) regardless if there is
demand or not.
Test Operation For CASSETTE
Perform test operation after completing gas leak and electrical
safety check. (See Fig. 47)
Manual button
OPERATION TIMER
DEF./FAN
ALARM
Fig. 47 -- Display Panel
A150257
1. Push the “ON/OFF” button on Remote Control to begin
testing.
NOTE
: A protection feature prevents air conditioner from being
activated for approximately 3 to 4 minutes.
2. Push MODE button, select COOLING, HEATING, FAN
mode to check if all functions work correctly.
3. To run the test using the manual button in the indoor unit:
S
Push the manual switch once to energize the unit.
The set conditions of manual operation are as follows:
· Preset set point: 76
°
F (24
°
C)
· Fan speed: AUTO
· Discharge air direction: Pre--set position based on
operation in “Cool” or “Heat” mode
S
Set manual switch to “OFF” (by pushing it twice again)
after finishing test operation.
NOTE
:
For Heat Pumps, follow the same procedure.
Drainage Tes
t
a. Open the cover of water supply intake by turning and
pulling the cover.
b. Gradually insert a water bottle up into the fan coil unit
and fill drain pan.
c. Operate the unit under COOLING mode and check a
drain pump pumping (a time lag of 1 minute is allowed
before water flowing out depending on the length of the
drain pipe).
d. Check and confirm the water flows out through the drain
hose.
e. Check the drain water drops at the end of the drain pipe.
f. Make sure there is no water leak at the drainage
g. Reassemble the cover of water supply intake.