Toshiba MCY-MAP0401HT Installation Manual page 13

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
Real length
refrigerant charge R (kg) =
of liquid pipe
amount at site
Table 1
Pipe dia. at liquid side Ø6.4
Additional refrigerant amount / 1 m (kg) 0.025 0.055
Example: (0501 type)
L1 Ø9.5 : 10 m L2 Ø9.5 : 10 m
Ø6.4 : 3 m c Ø6.4 : 4 m
Additional charge amount R (kg)
= (Lx × 0.025 kg/m) + (Ly × 0.055 kg/m) + (–0.4 kg)
= (12 × 0.025 kg) + (28 × 0.055 kg) + (–0.4 kg)
= 1.44 kg
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.
23-EN
Additional refrigerant charge Compensation
× amount per liquid pipe 1m + by outdoor HP
(Table 1)
Table 2
Ø9.5 Outdoor unit capacity type 040 type 050 type
Compensation by outdoor HP (kg) –0.8 –0.4
L3
L2
L1
a b c
L3 Ø9.5 : 5 m a Ø9.5 : 3 m
d Ø6.4 : 5 m
Lx: Real total length of liquid pipe Ø6.4 (m)
Ly: Real total length of liquid pipe Ø9.5 (m)
Full opening of the valve
• Open the valve of the outdoor unit fully.
• Using a 4 mm-hexagonal wrench, open fully the valve key on the liquid side.
• Using a spanner open fully the valve key on the packed valve at suction gas side.
• Using a pair of pinchers, open fully the handle on the ball valve at the discharge gas side.
Be careful that the handling of the ball valve differs from that of the packed valve.
◆ How to open the ball valve at gas side
Two types of valves are provided to the gas side.
Refer to the corresponding one.
The valve is changed to a renewal one from type 1 to type 2. (Both functions are same, but structure of the stem stoppers are
(Table 2)
different.)
Therefore confirm the structure surely and then open or close the valve.
060 type
0
Charge port
d
Position of grooves for driver
Closed completely
*1: When opened fully, do not apply an excessive torque after the
screwdriver hit the stopper; otherwise a trouble may be caused
on the valve.
– 12 –
Valve unit
Using a minus screwdriver,
turn it counterclockwise by
90° until it hits the stopper.
(Full open)
Flare nut
Valve handling precautions
• Open the valve stem or the handle until it strikes the
stopper. It is unnecessary to apply further force.
• Securely tighten the cap with a torque wrench.
• Cap tightening torque
Grooves
Ø9.5
for driver
Valve size
Opened fully
Ø15.9
Charge port
33 to 42 N•m (3.3 to 4.2 kgf•m)
20 to 25 N•m (2.0 to 2.5 kgf•m)
14 to 18 N•m (1.4 to 1.8 kgf•m)
EN
24-EN