41
Addition of refrigerant
After vacuuming work, exchange the vacuum pump with the refrigerant bomb and then start the additional charging
work of refrigerant.
Calculation of additional refrigerant charge amount
Refrigerant charge amount at shipment from the factory does not include the refrigerant for pipe at the local site.
For refrigerant to be charged in pipe at the local site, calculate the amount and charge it additionally.
NOTE) If the additional refrigerant amount indicates minus as the result of calculation, use the air conditioner
without addition of 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, balance side 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>
• Fill the additional refrigerant record column of the wiring diagram indication plate with the additional refrigerant
amount at installation work, total refrigerant amount and the name of the service man who charged refrigerant
at installation time.
• The total refrigerant amount means the total value of the refrigerant amount at shipment and the additional
refrigerant amount at installation time. The refrigerant amount at the shipment is one described on the “Unit
nameplate”.
Outdoor unit Model
Charging amount (kg)
MMY-MAP0802FT8 MMY-MAP1002FT8 MMY-MAP1202FT8
11.5
Additional refrigerant Real length Additional refrigerant charge
charge amount at local site
=
of liquid pipe
×
amount per 1m liquid pipe (Table 1)
× 1.3
Example : Additional charge amount R (kg) = {(L1 × 0.025kg/m) + (L2 × 0.055kg/m) + (L3 × 0.105kg/m)} × 1.3
L1 : Real total length of liquid pipe Ø6.4 (m)
L2 : Real total length of liquid pipe Ø9.5 (m)
L3 : Real total length of liquid pipe Ø12.7 (m)
System : 10HP
Table-1 Table-2
Liquid
pipe dia.
(mm)
6.4
9.5
12.7
15.9
19.1
22.2
Additional refrigerant
amount/1m liquid pipe
(kg/m)
0.025
0.055
0.105
0.160
0.250
0.350
Combined
(HP)
8
10
12
16
18
20
24
26
28
30
Combined outdoor unit
(HP)
8
10
12
8 8
10 8
10 10
8 8 8
10 8 8
10 10 8
10 10 10
C (Corrected refrigerant amount)
(kg)
2.0
2.5
3.0
–1.5
0.0
2.0
–4.5
–3.0
–1.5
0.0
5
REFRIGERANT PIPING
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