Recharge Of Refrigerant; Environmental Concern - Toshiba MiNi-SMMS MCY-MAP0501HT Service Manual

5. Recharge of Refrigerant

When recharge of the refrigerant is required, charge the new refrigerant with the specified amount in the
procedure as described below.
Recover the refrigerant and check there is no refrigerant in the
equipment.
Connect the charge hose to the packed valve service ports at gas
side, liquid side of the outdoor unit.
Connect the charge hose to vacuum pump adaptor.
Open the packed valves fully at liquid and gas sides, and then return
the valve at gas side a little to the closed side.
Open fully PMV of the outdoor unit.
• Turn on power of the outdoor unit.
• Short CN30 on I/F P.C. board of the outdoor unit.
• Turn off power of the outdoor unit within 2 minutes after shorting CN30.
Open fully the handle on the Low side of the gauge manifold, and
then turn on the power of vacuum pump for vacuuming.
When the pressure has lowered until indication of the compound
gauge pointed –0.1MPa (–76cmHg), open fully the handle Low and
turn off the power of vacuum pump.

Never charge the refrigerant over the specified amount.
‚
Do not charge the additional refrigerant.
If charging refrigerant additionally when refrigerant gas
leaks, the refrigerant composition in the refrigerating cycle
changes resulted in change of air conditioner characteris-
tics or refrigerant over the specified standard amount is
charged and an abnormal high pressure is applied to the
inside of the refrigerating cycle resulted in cause of
breakage or injury.
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Set the equipment so that liquid refrigerant can be charged.
‚
When using a cylinder with siphon pipe, liquid can be charged without
[ Cylinder with siphon ]
Gauge manifold
Refrigerant
cylinder
Electronic
balance

6. Environmental concern

Use "Vacuum pump method" for an air purge (Discharge of air in the connecting pipe) in installation time.
• Do not discharge flon gas into the air to protect the earth environment.
• Using the vacuum pump method, clear the remaining air (Nitrogen, etc.) in the unit. If the air remains, the
pressure in the refrigerating cycle becomes abnormally high and an injury could occur through failure of
the product.
[ Cylinder without siphon ]
Gauge manifold
OUTDOOR unit
Electronic
balance
Leave it as it is for 1 to 2 minutes and check the indicator
of the compound gauge does not return.
Set the refrigerant cylinder on the electronic balance,
connect the charge hose to connecting ports of the
cylinder and the gauge manifold, and then charge the
liquid refrigerant from the service port at liquid side.
(Shield with the gauge manifold so that refrigerant does
not flow to gas side.)
Connected to
Valve fully closed
indoor unit
(gas side)
Main
pipe
Brazed
Fully
tightened
Valve fully closed
(liquid side)
Connected to other
terminal units
4mm-hexagonal wrench is required.
inverting the cylinder.
OUTDOOR unit
R410A refrigerant is consisted with HFC mixed refrigerant.
Therefore if the refrigerant gas is charged, the composition
of the charged refrigerant changes and characteristics of
the equipment changes.
9
Low- High-
pressure gauge pressure gauge
V V Gauge
L H
manifold
Center unit
Service
Reducing
port
valve
Ø6.4
Copper pipe
Service port
Nitrogen
Ø6.4
Copper pipe
Siphon
gas