Pump Down Of Refrigerant; Refrigerant Check Joints - Hitachi YUTAKI S80 Series Technical Catalogue
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Also See for YUTAKI S80 Series:
- Installation and operation manual (434 pages) ,
- Instruction manual (46 pages) ,
- Instruction and operation manual (194 pages)
Table of Contents
9. Refrigerant and water piping
9.1.5 Pump down of refrigerant
1st cycle (R410A)
C A U T I O N
• To pump down the refrigerant of the R410A cycle (1st cycle) it must be done through the outdoor unit. Refer to
the outdoor unit
Installation and operation manual
• To pump down the R410A refrigerant from the indoor unit, supply power to it.
• In case outdoor unit test run failure (compressor failure, etc.), switch the DSW1-2 ON of indoor unit PCB1.
Thereby the indoor unit SV1 and SV2 open and allow the R410A refrigerant inside the indoor unit to flow to be
collected from the outdoor unit side. Switch the DSW1-2 OFF when finishing the procedure.
2nd cycle (R134a)
C A U T I O N
The 2nd cycle (R134a) connections are factory installed and refrigerant charged so no vacuum or pumping down
work is needed.
9.1.6 Refrigerant check joints
1st cycle (R410A) Outdoor unit
(Front view)
Part name
Check joint for gas stop valve "A"
Check joint for piping "B"
Check joint for liquid stop valve "C"
102
TCGB0075 rev.0 - 11/2012
for the procedure.
B
C
A
Compressor
Function
High pressure
Exclusive for vacuum and
pump down refrigerant
Low pressure
2nd cycle (R134a) Indoor unit
Hydraulic circuit
C
A
(Front side)
Part name
Check joint for piping "A"
Check joint for piping "B"
Check joint for piping "C"
Heat exchangers
B
(Right side)
Function
High pressure or vacuum
Vacuum and pump down refri-
gerant
Low pressure or vacuum
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