Marvair AVP 24 Manuel télécharger pdf (Page 30)

ComPac 6/09-18

3.1 CheCk-ouT of CoolinG CyCle

Important: Be sure that the crankcase heater (if used) has been energized for at least 24 hours

before starting the unit(s). Double-check all electrical connections before applying power.

ComPac

air conditioners with scroll compressors running on 3Ø power must be checked for

proper rotation during the initial start-up. Please refer to Section 2.8 for determining if the 3Ø

compressors are rotating correctly. Incorrect rotation can damage the compressor and is not

covered by the warranty

Procedure:

1. Set the cooling temperature on the wall thermostat to a point higher than the ambient temperature.

Set the heating temperature to a temperature that is lower than the ambient.

2. Set the thermostat system switch in the AUTO position. Nothing should operate at this time.

3. Set the time delay in the ComPac

I or ComPac

II A/C control box to three minutes. Check the

changeover setting of the H205A or dry bulb sensor and reset it if needed (ComPac II A/C only).

See Section 1.6.

4. Slowly lower the thermostat's cooling temperature until the switch closes. The indoor fan should

operate.

Once the indoor fan turns on, allow approximately three minutes for the compressor to start. Note that

the outdoor fan may not come on immediately, because it is cycled by refrigerant pressures.

NOTE: (ComPac

II A/C only) To check the system operation under different ambient conditions, the

air temperature and enthalpy sensors must be "tricked". When outdoor ambient conditions are higher

than the control setting, a component cooler aerosol may be sprayed directly into the enthalpy sensor

to simulate low enthalpy conditions, causing the economizer damper to open.

Alternately, when outdoor conditions are lower than the set point, a source of heat such as a hair dryer

can be directed on the air temperature sensor to simulate warmer conditions, which will bring on

mechanical cooling and start the compressor.

5. To stop cooling, slowly raise the thermostat cooling to a temperature higher than the ambient.

If the unit fails to operate, refer to the troubleshooting information in Chapter 4.

Follow the same procedure for additional units.

NOTE: The fan purge allows the indoor fan to run for approximately 90 seconds after the compressor

is off. This operation provides a small improvement in system S.E.E.R.

3.2 CheCk-ouT of heaTinG CyCle

Procedure: (Applies only to units with resistance elements)

1. Raise the heating temperature to a setting which is higher than the ambient temperature. The fan

and electric heat should immediately cycle on.

2. Move the system switch to the "OFF" position. All functions should stop.

NOTE: (ComPac

II A/C only) The damper blade should remain closed during the heating cycle (un-

less the minimum position potentiometer has been set for constant ventilation A fully counterclockwise

position corresponds to full closure of the damper.

Chapter 3 Start-Up

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Marvair AVP 24 Manuel Page 30

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