Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 348

FDT ( N ) -H
(e) Air purge
Carry out the air purge of the indoor unit and refrigerant piping by vacuuming.
Procedures.
1) Tighten all the flare nuts of the piping on the side of indoor and outdoor units so that there is no leakage.
2) Carry out vacuuming from the service valve charge port with the service valves (both liquid and gas side) of the outdoor
unit fully closed.
3) After vacuuming, remove the cap nut for the valve stem, and thghten the cap nuts (cap nuts for valve stem and charge
port) with service valve (both liquid and gas) fully opened.
(f) Method of opening and closing service valve of outdoor unit
1) Remote the hexagonal cap nut.
2) Operate the valve using a hexagonal wrench to open by left
turn and to close by right turn.
3) Tighten the hexagonal cap nut after the piping works.
(g) Additional charge of refrigerant
Item
Basic refrigerant
charge amount
Model
FDC306H type 1.18
FDC406H type 1.43
FDC506H type 2.13
FDC306C type 1.18
FDC406C type 1.38
FDC506C type 2.13
Notes (1) Basic refrigerant charge amount means refrigerant amount when refrigerant piping length is 0 m.
(2) When the refrigernat piping length exceeds the length that additional refrigerant charge is not required, charge
additional refrigerant based on to the calculated amount of refrigerant per unit piping length.
Example of additional charge amount calculation
Calculate the additional charge amount for the model FDT508HES-A when the piping length is 25 m.
×
(25 - 5)
Length that additional refrigerant charge is not required (m)
Total length of the piping (one way) (m)
Additional charge amount of refrigerant = 0.70 kg (Calculate the amount in any case.)
(3) 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 gas is filled for prevention of the air entry.
(4) In the case of FDR408 and FDU408, it is 0 m.
(3) Electric wiring
TURN OFF ELECTRIC POWER AT CIRCUIT BREAKER OR POWER SOURCE
BEFORE MAKING ANY ELECTRIC CONNECTIONS.
GROUND CONNECTIONS MUST BE COMPLETED BEFORE MAKING LINE
VOLTAGE CONNECTIONS.
• This air conditioning system should be notificated to supply authority connection to power supply system.
(a) Selection of size of power supply and interconnecting wires.
Precautions for Electric wiring
• Electric wiring work should be conducted only by authorized personnel.
• Do not connect more than three wires to the terminal block. Always use round type crimped terminal lugs with insulated
grip on the ends of the wires.
• Use copper conductor only.
• Power source wires and interconnecting wires shall not bo lighter than polychloroprene shcathcd fiexible cord
(design H05RN-F IEC57).
346
Factory charge amount of refrigerant
(1)
Outdoor unit
1.3
1.6
2.3
1.3
1.55
2.3
0.035 = 0.70
Additional charge amount (kg)
Additioanl charge amount per 1 m (kg/m)
OWARNING
DANGER OF BODILY INJURY OR DEATH
Item
Gas side
Hexagon
Liquid side
wrench size
Unit : kg
Additional
charge amount
Indoor unit per meter
0.025
0.035
0
Holding
( )
charged
0.025
0.035
Model
FDC306 FDC406, 506
4 6
4 4
Length that
Maximum
additional
piping
charge is not
length
(4)
required
5 m 30 m