Heat Controller VMC24SB-1/VMH24SB-1 service manual Test Run Detail, Settlement of outdoor unit

Part 3 Test Run

3. Test RunDetail

1.Check that all tubing and wiring have been properly con- nected.

2.Check that the gas and liquid side service valves are fully open.

Settlement of outdoor unit

•Anchor the outdoor unit with a bolt and nut Ø0.39 inch tightly and horizontally on a concrete or rigid mount.

•When installing on the wall, roof or rooftop, anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake possibilities.

•When vibration of the unit is conveyed through the hose, secure the unit with an anti-vibration bushing.

Bolt

Tubing connection

Evaluation of the performance

Operate unit for 15~20 minutes, then check the system refrigerant charge:

1.Measure the pressure of the gas side service valve.

2.Measure the temperature of the intake and discharge air.

3.Ensure the difference between the intake temperature and the discharge is more than 8˚C(46˚F) (Cooling or Heating).

NOTE: If the actual pressure is higher than shown, the system is most likely over-charged, and charge should be removed.

If the actual pressures are lower than shown, the system is most likely undercharged, and charge should be added.

The air conditioner is now ready for use.

PUMP DOWN

This is performed when the unit is to be relocated or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant in the outdoor unit without loss in refrigerant gas.

CAUTION:

Be sure to perform Pump Down procedure with the unit in cooling mode.

Pump Down Procedure

1.Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.

2.Open the gas side service valve halfway and purge the air from the manifold hose using the refrigerant gas.

3.Close the liquid side service valve(all the way in).

4.Turn on the unit's operating switch and start the cooling operation.

5.When the low-pressure gauge reading becomes 1 to 0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the gas side valve stem and then quickly turn off the unit. At that time, Pump Down has been completed and all refrigerant gas will have been collected in the outdoor unit.

5.Check operating current.

Intake temperature

Discharge air

Discharge temperature

4.For reference; the gas side pressure of optimum condition is as below.(Cooling)

6.Change from cooling mode to heating mode (if heat pump model) and check all operations.

Refrigerant	Outside ambient	The pressure of the gas side
	TEMP.	service valve.
R22	35°C (95°F)	4~5kg/cm2G(56.8~71.0 P.S.I.G.)
R410A	35°C (95°F)	8.5~9.5kg/cm2G(120~135 P.S.I.G.)

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Only for training and service purposes