Start And Stop Of The Pump Down; A Flow Chart Of Pump Down - Fujitsu R407C Service Manual

6-3 PUMP DOWN METHOD

6-3-1 START AND STOP OF THE PUMP DOWN

(1) If the following condition is satisfied, pump down operation will start.
When the operation mode is stopped and pump down DIP-SW 1-3 turns OFF
(2) Pump down operation stops immdiately in the following cases.
When pump down DIP-SW is turned ON
When the discharge pressure sensor detects a pressure higher than 3MPa.

6-3-2 A FLOW CHART OF PUMP DOWN

OUTDOOR UNIT
DIP-SW
" OFF "
Compressor 1 3 " ON "
Electronic expansion valve 1/2
INDOOR UNIT
Receiving start signal
of pump down
Electric expansion valve
RB unit
Discharge valve (SV
Suction valve
Bypass valve
Indoor fan motor (SV
No
RB unit
Discharge valve (SV
Suction valve
Indoor fan motor : OFF
Operation mode
" STOP "
DIP-SW " ON " +30sec
Stand by
DIP-SW " ON "
: 500 pulse
: Fully opened
) : Open
D
(SV ) : Open
S
(SV ) : Close
B1
) : Open
B2
Receiving finish
signal of pump down
Yes
) : Close
D
(SV ) : Open
S
Operation stops
OFF
DIP-SW " OFF "
6 minutes or longer have elapsed since pump down
started or discharge pressure 3.0MPa or greater
06-09
ON.
Compressor 1 3 " OFF "
( Error )