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Toshiba MCY-MAP0401HT Manual

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18
Addition of refrigerant
After vacuuming work, exchange the vacuum pump with the refrigerant bomb and then start the additional charging
work of refrigerant.
Calculating the amount of additional refrigerant required
When the system is charged with refrigerant at the factory, the amount of refrigerant needed for the pipes on site is
not included. Calculate the additional amount required, and add that amount to the system.
Additional refrigerant charge amount is calculated from size of liquid pipe at site and its real length.
Additional
refrigerant charge
R (kg)
amount at site
Real length
of liquid pipe
=× +
Additional refrigerant charge
amount per liquid pipe 1m
(Table 1)
Compensation
by outdoor HP
(Table 2)
Example : (0501 type)
Note)
If the additional refrigerant amount indicates a negative result from the calculation, use air conditioner without
the adding of any additional refrigerant.
Charging of refrigerant
• Keeping valve of the outdoor unit closed, be sure to charge the liquid refrigerant into service port at liquid side.
• If the specified amount of refrigerant cannot be charged, open fully valves of outdoor unit at liquid and discharge/
suction gas sides, operate the air conditioner in COOL mode under condition that valve at suction gas side is a
little returned to close side, and then charge refrigerant into service port at suction gas side. In this time, choke the
refrigerant slightly by operating valve of the bomb to charge liquid refrigerant. The liquid refrigerant may be
charged suddenly, therefore be sure to charge refrigerant gradually.
• When refrigerant leaks and refrigerant shortage occurs in the system, recover the refrigerant in the system and
recharge refrigerant newly up to the correct level.
REQUIREMENT
Entry of refrigerant charge amount
• Complete the refrigerant record column found on the wiring diagram, with detail of the additional refrigerant
amount and name of service engineer at the time of installation.
• The total amount of refrigerant refers to the shipment charge plus any additional refrigerant at the time of
installation. The refrigerant amount at shipment is indicated on the unit name plate.
Lx : Real total length of liquid pipe Ø6.4 (m)
Ly : Real total length of liquid pipe Ø9.5 (m)
L1 Ø9.5 : 10m L2 Ø9.5 : 10m L3 Ø9.5 : 5m a Ø9.5 : 3m
b Ø6.4 : 3m c Ø6.4 : 4m d Ø6.4 : 5m
Additional charge amount R (kg)
= (Lx × 0.025kg/m) + (Ly × 0.055kg/m) + (–0.4kg)
= (12 × 0.025kg) + (28 × 0.055kg) + (–0.4kg)
= 1.44kg
a
L2
L3
L1
bcd
Table 1
Table 2
0401 type 0501 type 0601 type
–0.8 –0.4 0
Pipe dia. at liquid side
Additional refrigerant amount/1m
(kg)
Outdoor unit capacity type
Compensation by outdoor HP
(kg)
Ø6.4 Ø9.5
0.025 0.055
… 21 …


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