Air Purge; Adding Refrigerant - Toshiba MMY-MAP1004HT8-E Installation Manual

Super modular Multi System

Air purge

• Be sure to perform vacuuming from both liquid and gas sides.
• Be sure to use a vacuum pump equipped with the counter-flow prevention function so that oil in the pump will
not flow back into piping for air conditioners. (If oil in the vacuum pump enters in the air conditioner with R410A
refrigerant, a problem may be caused in the refrigerating cycle.
After finishing the airtight test and discharging nitrogen gas, connect the gauge manifold to the service ports of the
liquid side, gas side, and balance pipe side and connect a vacuum pump as shown in the figure below. Be sure to
perform vacuuming for the liquid, gas, and balance pipe sides.
Main pipe
Packed valve details
To outdoor unit
To gauge manifold
Gas-side
To
packed valve
Liquid-side service port
outdoor
or ball valve
unit
Liquid-side packed valve
To
Balance
outdoor
service port
unit
Piping at site
Balance
Piping at site
packed
valve
Piping at site
• Use a vacuum pump with a high vacuuming degree [-100.7kPa (5Torr, -755mmHg)] and large exhaust gas
amount (40L/minute or larger).
• Perform vacuuming for 2 or 3 hours, though the time differs depending on the pipe length. Check that all the
packed valves at the liquid side, gas side, and balance pipe side are fully closed.
• If the pressure does not reach -100.7kPa or less, continue vacuuming for 1 hour or more. If the pressure does
not reach -100.7kPa after 3 hours of vacuuming, stop vacuuming and check for air leakage.
• If the pressure reaches -100.7kPa or less after vacuuming for 2 hours or more, close the valves VL and VH on
the gauge manifold fully and stop the vacuum pump. Leave it as it is for 1 hour to confirm that the vacuuming
degree does not change.
If the degree of vacuum loss is large, moisture may remain in the pipes. In that case, inject dry nitrogen gas and
apply pressure to 0.05MPa and perform vacuuming again.
• After finishing the above procedure of vacuuming, exchange the vacuum pump with a refrigerant canister and
advance to the additional charging of refrigerant.
27-EN
Installation Manual
Lowpressure
gauge
Connected to indoor unit
Packed valve fully closed
(gas side)
V
Header outdoor unit
Brazed
Service port
Fully
closed
Service port
Packed valve fully closed
(liquid side)
Fully
closed
Packed valve fully closed
(balance)
Follower units
Super modular Multi System

Adding refrigerant

After finishing vacuuming, exchange the vacuum pump with a refrigerant canister and start additional charging of
refrigerant.
Calculation of additional refrigerant charge amount
Refrigerant charge amount at shipment from the factory does not include the refrigerant for pipes at the local site.
For refrigerant to be charged in pipes 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
Highpressure
gauge
additional refrigerant.
Gauge
V
L H Outdoor unit model name
manifold
Charging amount (kg)
Additional refrigerant charge
amount at local site
Table 1
Liquid pipe dia. (mm)
P
Additional refrigerant amount/1m liquid
Vacuum pump
pipe (kg/m)
Table 2
Standard Model
MAP0804∗ MAP1004∗ MAP1204∗
11.5
Additional refrigerant charge
= Real length of liquid pipe × amount per 1m liquid pipe
(Table 1)
6.4 9.5 12.7
0.025 0.055 0.105
Combined HP (HP) Combined outdoor units (HP)
8 8HP
10 10HP
12 12HP
14 14HP
16 16HP
18 10HP 8HP
20 10HP 10HP
22 12HP 10HP
24 12HP 12HP
26 16HP 10HP
28 16HP 12HP
30 16HP 14HP
32 16HP 16HP
34 12HP 12HP 10HP
36 12HP 12HP 12HP
38 16HP 12HP 10HP
40 16HP 12HP 12HP
42 16HP 14HP 12HP
44 16HP 16HP 12HP
46 16HP 16HP 14HP
48 16HP 16HP 16HP
Installation Manual
MAP1404∗ MAP1604∗
Corrective amount of refrigerant
depending on HP of co-
+
operating outdoor units
(Table 2)
15.9 19.1 22.2
0.160 0.250 0.350
C (Corrective amount
of refrigerant) (kg)
1.5
2.5
3.5
8.5
10.5
0.0
3.0
5.0
7.5
8.5
9.5
11.5
12.5
3.0
4.0
6.0
7.0
8.0
10.0
12.0
14.0
EN
28-EN