Recharge of Refrigerant, Environment | Toshiba MMU-AP0091MH specification

5. Recharge of Refrigerant

When recharge of the refrigerant is required, charge the new refrigerant with the specified amount in the procedure as described below.

Recover the refrigerant and check there is no refrigerant in the equipment.

Connect the charge hose to the packed valve service ports at gas side, liquid side, and balance side of the outdoor unit.

Connect the charge hose to vacuum pump adaptor.

Open the packed valves of the balance pipe fully at liquid and gas sides, and then return the valve at gas side a little to the closed side.

Open fully PMV of the outdoor unit.

•Turn on power of the outdoor unit.

•Short CN30 on I/F P.C. board of the outdoor unit.

•Turn off power of the outdoor unit within 2 minutes after short-circuiting.

When the pressure has lowered until indication of the compound gauge pointed -0.1MPa (–76cmHg), open fully the handle Low and turn off the power of vacuum pump.

Leave it as it is for 1 to 2 minutes and check the indicator of the compound gauge does not return.

Set the refrigerant cylinder on the electron balance, connect the charge hose to connecting ports of the cylinder and the electron gauge, and then charge the liquid refrigerant from the service port at liquid side. (Shield with the gauge manifold so that refrigerant does not flow to gas side.)

(Charge the refrigerant as below.)

Low-High-

pressure gauge pressure gauge

Open fully the handle Low of the gauge manifold, and then turn on the power of vacuum pump for vacuuming.

Q Never charge the refrigerant over the specified amount.

R Do not charge the additional refrigerant.

If charging refrigerant additionally when refrigerant gas

leaks, the refrigerant composition in the refrigerating

cycle changes resulted in change of air conditioner

characteristics or refrigerant over the specified stan-

dard amount is charged and an abnormal high

pressure is applied to the inside of the refrigerating

	Connected to	Valve fully closed
	indoor unit	Valve fully closed
	indoor unit	(gas side)
	Main	(gas side)
	Main	Center unit
	pipe	Center unit
	pipe
	Brazed	Service
		Service
		port Ø6.4
	Fully	Copper pipe
	Fully
	tightened
		Service port
		Valve fully closed
		(liquid side)
	Connected to other
	terminal units

VL VH Gauge manifold

Reducing valve

Ø6.4 Copper pipe

Nitrogen gas

cycle resulted in cause of breakage or injury.

4mm-hexagonal wrench is required.

Q R

Set the equipment so that liquid refrigerant can be charged.

When using a cylinder with siphon pipe, liquid can be charged without inversing the cylinder.

[ Cylinder with siphon ]

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

[ Cylinder without siphon ]

Gauge manifold

Siphon

OUTDOOR unit

cylinder Refrigerant

Electronic	Electronic
balance	balance

R410A refrigerant is consisted with HFC mixed refrigerant. Therefore if the refrigerant gas is charged, the composition of the charged refrigerant changes and characteristics of the equipment changes.

6. Environment

Use “Vacuum pump method” for an air purge (Discharge of air in the connecting pipe) in installation time.

•Do not discharge flon gas into the air to protect the earth environment.

•Using the vacuum pump method, clear the remained air (Nitrogen, etc.) in the unit. If the air remains, the pressure in the refrigerating cycle becomes abnormally high and an injury and others are caused due to burst.

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications

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Toshiba MMU-AP0091MH Recharge of Refrigerant, Environment, 4mm-hexagonal wrench is required

Models: MMU-AP0181MH MMU-AP0071MH MMU-AP0091MH MMU-AP0151MH MMU-AP0121MH