Marvair AVP 24 Manuel télécharger pdf (Page 31)

ComPac 6/09-18

3.3 a/C TesTinG WiTh ll357D4

Note: The LL357D4 does not require the units to be in phase.

Procedure: (A/C Testing with LL357D4 Lead/Lag Control for Two Units)

Prior to testing the air conditioners, the LL357D4 must be correctly congured. Please refer to the

LL357D4 Product Data Sheet for instructions on installing and conguring the unit.

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 temperature. Turn the

selector switch to the “off” position.

2. Set the time delay on unit No. 1 to “3” minutes, and No. 2 to “5” minutes.

3. Set the change over setting of the enthalpy control to the “d” setting (ComPac

II A/C only).

4. Provide power to A/C units and turn disconnects on.

5. Check incoming power to each unit. For units designed for operation on 208/230v, 60hz power

supply, the transformer is factory wired for a 230 power supply. For a 208 power supply remove

the orange lead from the transformer and connect the red lead. Insulate the orange lead.

6. Cooling. Turn the selector switch on the thermostat to the “auto” position. Slowly lower the cooling

temperature until the switch closes. The indoor fan should operate on the lead unit. Once the indoor

fan turns on, allow approximately 3 to 5 minutes for the compressor to start. Note that the outdoor

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

temperature until the switch closes. Follow the above procedures for the lag unit.

The green light on the lead lag control should be on. One amber light will be on to identify the lead

unit. The other light should be off. If the lag unit comes on with the lead unit the light for the lag

unit will not come on. You should never have all 3 lights on at one time.

Allow the units to run for 2 to 3 minutes then check the temperature differential between the return

air and the supply air with digital thermometer. The temperature differential should be between 12

and 20 degrees depending on ambient temperature.

Next, slowly raise the cooling temperature until the switch opens. The compressor and outdoor

fan should turn off. The indoor fan will continue to run for “90” seconds until the fan purge times

out. Raise the temperature until the switch opens. The lead unit will shut down accordingly to the

same procedures as outlines above.

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 stimulate 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 enthalpy sensor to simulate warm conditions, which will bring on

mechanical cooling and start the compressor.

7. Heating. Slowly raise the heating temperature until the switch closes. The fan and electrical heat

should immediately cycle on. The unit should start blowing warm air in 2 to 3 minutes. Next, raise

the temperature until the switch closes. Follow the above procedures for lag unit.

Hold the manual advance button in for nine seconds the lead lag lights should switch. Next, slowly

lower the temperature until the switches open. The lag unit should shut down immediately. Next,

slowly lower the temperature until the switch opens, the lead unit should shut down immediately.

8. Replace thermostat cover and panels on the unit.

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Marvair AVP 24 Manuel Page 31

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