Toshiba Carrier MCY-MAP0607HS-UL Installation Manual - Page 13

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Toshiba Carrier MCY-MAP0607HS-UL Installation Manual

 Air purge

NOTE

For the air purge at installation time (discharge of air in the connecting pipes), use the "Vacuum pump method".

• For protection of the earth's environment, do not discharge the refrigerant gas into the air.

• Eliminate the remaining air (nitrogen gas, etc.) in the unit with a vacuum pump.

If gas remains, performance and reliability of the unit may be reduced.

After the airtight test, discharge the nitrogen gas. Then connect the gauge manifold to the service ports at the gas side

and liquid side, and connect the vacuum pump as shown in the following figure.

Perform vacuuming for gas side and liquid side.

• Perform the vacuuming method from both the liquid and gas sides.

• Use a vacuum pump with the counter-flow preventive function so that oil in the pump does not back up in the air

conditioner pipe when the pump has been stopped. (If oil in the vacuum pump enters into the air conditioner with

R410A refrigerant, a problem may occur in the refrigeration cycle.)

Connected to indoor unit

Ball valve fully closed

Main pipe

(Gas side)

Flare connection

• Use a vacuum pump that has a high vacuum (below -14.6 psi) and a large exhaust gas amount (over 40 L /minute).

• Perform vacuuming for 2 or 3 hours (time differs due to pipe length).

In this time, check all valves at the liquid and gas sides are fully closed.

• If the vacuuming valve amount is not decreased to below -14.6 psi even after vacuuming for 2 hours or more,

continue vacuuming for 1 hour or more.

If -14.6 psi or less cannot be obtained by 3 hours or more of vacuuming, detect and repair the leak.

• When the vacuuming valve has reached -14.6 psi or less after vacuuming for 2 hours or more, close valves VL and

VH on the gauge manifold fully. Stop the vacuum pump, leave it as it is for 1 hour and then check that the vacuum

does not change. If it does change, then there may be a leak within the system.

• After the above procedure for vacuuming has finished, exchange the vacuum pump with a refrigerant cylinder and

advance to the additional charging of refrigerant.

EN-23

Low pressure

High pressure

gauge

Gauge

manifold

Outdoor unit

Service port

Packed valve fully closed

Vacuum pump

(Liquid side)

 Adding refrigerant

After vacuuming is complete, exchange the vacuum pump with a refrigerant canister and start the additional charging of

refrigerant.

Calculation of additional refrigerant charge amount

The default refrigerant amount 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.

Outdoor unit type

MAP0367

Charging amount (lbs (kg))

Additional

Real length of liquid

refrigerant charge

pipe

amount at local site

Table 1

Liquid pipe dia. (in)

Additional refrigerant amount /

1 ft liquid pipe (lbs/ft)

Table 2

Outdoor unit type

Compensation by outdoor capacity (lbs (kg))

Example: (060 type)

Ø3/8": 32.8 ft

Ø1/4": 9.8 ft

Additional charge amount R (kg)

Lx: Real total length of liquid pipe diameter

Ly: Real total length of liquid pipe diameter

= {( Lx × 0.017 lbs/ft ) + ( Ly × 0.038 lbs/ft )} × 1.2 + ( 1.76 lbs )

= {( 39.3 × 0.017 lbs ) + ( 91.8 × 0.038 lbs )} × 1.2 + ( 1.76 lbs )

= 6.75 lbs

– 12 –

MAP0487

MAP0607

14.8 (6.7)

Additional refrigerant

Compensation by

charge amount per

1.2

outdoor HP

1 ft liquid pipe

(Table 2)

(Table 1)

Ø1/4"

Ø3/8"

0.017

0.038

MAP0367

MAP0487

0 (0)

0.88 (0.4)

Ø3/8": 32.8 ft

Ø3/8": 16.4 ft

Ø1/4": 13.1 ft

Ø1/4": 16.4 ft

(ft)

1/4"

(ft)

3/8"

Installation Manual

MAP0607

1.76 (0.8)

Ø3/8": 9.8 ft

EN-24