Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 345

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.
(4) Drain piping work
¡ Execute the drain piping by using field purchased parts of pipe, elbow, and grommets, if the drainage work is needed.
Drain elbow (1 pc.)
(local procurement)
Hard vinyl chloride pipe for
general purpose (VP-16)
(local procurement)
(5) Electrical wiring
™ This air conditioning system should be notificated to supply authority before connection to power supply system.
(a) Selection of size of power supply and interconnecting wires.
¡ Electric wiring work should be conducted only by authorized personnel.
¡ Use copper conductor only.
¡ Power source wires and Interconnecting wires shall not be lighter than polychloroprene
sheathed flexible cord (design HO5RN-F IEC 57).
¡ Do not connect more than three wires to the terminal block.
¡ Use round type crimped terminal lugs with insulated grip on the end of the wires.
¡ Select wire sizes and circuit protection from Table 2.
Table 2 ( This table shows 20m length wires with less than 2% voltage drop. )
Model
FDC(P)208 type
FDC(P)258 type
FDC(P)308 type
FDC(P)308 type
FDC(P)408 type
FDC(P)508 type
FDC808 type
FDC1008 type
(b) Wiring connection.
1) Connect the same terminal number between the Indoor unit and Outdoor unit as shown in the following diagram.
Make wiring to supply to the Outdoor unit, so that the power for the Indoor unit is supplied by 1 and 2 terminals.
2)
3) Secure the wiring with wiring clamp so that no external force is transmitted to the connecting portion of terminal.
4) There is a ground (Earth) terminal in the control box.
(a) 1 phase model
Circuit breaker
Outdoor
Earth leakage
unit
breaker
HIGH VOLTAGE
Interconnecting
wires
Drain grommet
(2 pcs.)
O
IMPORTANT
Item
Circuit breaker
Phase
Switch breaker Over-current protector
(A)
1
30
3
50
Indoor
unit
™
There are 3 holes (ø 20) on the bottom plate of Outdoor
unit for draining condensed water.
™
To guide the condensed water to the gutter it is neces-
sary to install the unit on the flat base or blocks.
™
Connect the drain elbow as shown in the illustration and
close other holes with grommets.
Power source
wires
(minimum)
rated capacity (A)
20
5.5mm 2
30
ø 2.0 mm
15
20 5.5mm 2
50
8.0mm 2
(b) 3 phase model
Circuit breaker
Outdoor
Earth leakage
unit
breaker
HIGH VOLTAGE
Interconnecting
wires
FDT ( N ) -H
Interconnecting
and grounding
wires (minimum)
ø 1.6
20mm
Indoor
unit
343