20
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.
43 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.
During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 43. 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. 43 – 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
below ambient temperature. Operate the unit for 15 minutes.
4. Refer to Table 12 to determine if additional charge is
required. 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
carefully 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 UNDER
CEILING/CONSOLE
Perform test operation after completing gas leak and electrical
safety check (see Fig. 44).
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.
4. Be sure to set manual switch to “OFF” (by pushing it twice
again) after finishing test operation.
MANUAL
A150284
Fig. 44 – Manual Button from display board
Manual Operation
Manual operation can be accessed by pressing manual button on
display panel. Press the manual button repeatedly to change modes
as follows:
S
Once = AUTO mode [heat, cool or fan, 24
_
C and auto
fan speed.
S
Twice = COOLING mode [switch to AUTO mode after
30 minutes (mainly used for trial operation)]
S
Three times = OFF
NOTE
: For Heat Pumps, follow the same procedure.
Visually check that the condensate is being discharged from the
unit. If the unit is running in heating mode, the condensate needs to
be checked and the following needs to be performed:
S
Remove grille and frame from the unit.
S
On the opposite side of the drain connection, insert a
water bottle up into the fan coil unit and fill drain pan.
See Fig. 45.
A09552
Fig. 45 – Inserting Water Into Drain Pan
Water must flow regularly with condensate pump energized. If not,
check the pipe slope or see if there are any pipe restrictions.
NOTE
: The unit is equipped with a safety float switch to de--energize
the compressor if the drain pan water level gets too high.
