SERVICING
40
S
ET
7-S
EGMENT
M
ODE
D
ISPLAY
TO
PUMP DOWN
Please follow the following sequence to enter PUMP DOWN to
accumulate the refrigerant to outdoor unit.
Do not operate COOL ON or HEAT ON mode to enter PUMP DOWN.
Before starting the PUMP DOWN operation, change indoor fan
trim, delay and profile back to default and stop electric heater
and gas furnace. Remove if no trim feature. In this operation, the
gas and liquid service valve should be opened.
1. Set 7-segment display to SCREEN 4 (SETTING MODE 2) Setting
No. 8 and change the display from “-01” to “-00”. System will
then automatically start PUMP DOWN operation.
For information on how to set 7-segment display, see the sec-
tion SETTING THE MODE DISPLAY in this manual.
2. Approximately one minute later, the compressor should start
operating. Check the amperage at the compressor wiring to
see the compressor operation status. Unit display error code
E11 (System verification Test) once the PUMP DOWN opera-
tions starts.
3. Close liquid service valve approximately two minutes after
compressor has come on.
4. Compressor will come to a stop automatically. Close the gas
service valve immediately after the compressor stops.
NOTE:
Refrigerant cannot be collected to the outdoor unit com-
pletely if the system is overcharged or if there is a delay in closing
the liquid service valve and gas service valve. Evacuate the left
over refrigerant from the system using a recovery machine.
S
ET
T
HERMOSTAT
TO
C
HECK
SYSTEM STATUS
1. Follow the sequence 1. to 5. of
S
ET
T
HERMOSTAT
TO
A
DJUST
I
NDOOR
A
IR
CFM
TRIM
.
2. Select STATUS.
