Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 895

(6) Evacuating
Evacuating can be completed faster by evacuating both the check joint on the liquid side service valve and the check joint of the
evacuating gas pipe (accessory) connected to the gas side operation valve at the same time. (Of course, evacuating is possible even
through the liquid side check joint only.)
Gas side service valve
Liquid side service valve
(7) Refrigerant charge amount
(a) Additional charge amount
Item
Model
FDC140 type
FDC224 type
FDC280 type
Notes (1) When the refrigerant piping length exceeds the length that additional refrigerant charge is not required, charge additional refrigerant based on to
calculated amount of refrigerat per unit piping length.
(2) The unit is holding charge type that all of the refrigerant is charged in the outdoor unit and in the indoor unit only a small amount of refrigerant is filled for
prevention of the air entry.
Calculation of amount of refrigerant to be charged in local piping
The amount refrigerat additionally charged in local piping depends on connection pipe size but not on indoor unit type.
[Amount of refrigerant to be charged in the local piping = Actual length of liquid pipe
additionally charged per meter of liquid pipe]
[Example] Amount of refrigerant additionally charged = (1
: Overall length (m) of φ 12.7 liquid pipe
1
1
: Overall length (m) of φ 9.52 liquid pipe
1
2
: Overall length (m) of φ 6.35 liquid pipe
1
3
Following precautions must be observed when the model is adapted to R407C.
(1) Tools and related components should be changed when handling a different kind of refrigerant in order to prevent mixing of different
oils. Gauge manifold and charge hose, particularly, should never be used after using them for R22.
(2) Charge cylinder should not be used. Otherwise, the refrigerant composition may change when charging R407C into the cylinder.
(3) Refrigerant should be charged in the liquid phase from the container. Charging the refrigerant in the gaseous phase could change the
refrigerant composition substantially.
(4) Volume of refrigerant to be taken out in the liquid phase from the container should be up to 90% of necessary quantity (in weight percent)
as a standard.
(5) Refrigerant should not be replenished even if a leakage is discovered because it could change the refrigerant composition substantially.
When a leakage is discovered, replace with new refrigerant in the specified volume. However, it could be replenished temporarily in case of
an emergency.
Outdoor unit
Close
Close
Check joint
Indoor unit
Additional charge amount per 1 m
of liquid pipe
φ12.7 φ9.52
0.12 kg/m 0.06 kg/m 0.03 kg/m
Gauge manifold
Open Open
Indoor unit
Indoor unit
Factory charge amount at time of shipment
φ6.35
Outdoor unit
9.0 kg
12.0 kg
0.12) + (1 0.06) + (1
1 2
FDC-HKX
Vacuum pump
Indoor unit Remarks
Additional
Holding
refrigeramt
charged
Charge is not
required
Amount of refrigerant
0.03)
3
893