Airedale SmartCool 11-233kW Manuel d'utilisateur télécharger pdf (Page 169)

Precision Air Conditioning

SmartCool

– D

Precision Air Conditioning

169

Installation, Maintenance and Commissioning Manual :6877419 02/2013

Commissioning procedure

Chiller /Glycol units

Glycol Type/

Concentration

Check and record the glycol type and strength. Low levels of glycol can cause freeze up

problems when operating at low temperatures or during the unit off state during cold

ambient conditions.

Glycol concentration is measured by use of a Refractometer.

High concentrations of glycol can increase the system pressure drop and impair heat

exchanger performance.

Water Flow Rate

Record on the commissioning sheet the water flow rate.

Water Pressure Drop

Record the water solution pressure drop at full flow to the coil. Binder insertion points are

fitted to the unit for this purpose.

3 Way Water Bypass Valve

Change the valve position to full bypass; record the waterside pressure drop of the unit.

Using the balancing valve (if fitted) ensure that the waterside pressure drop is the same

as the coil pressure drop.

This will ensure correct water flow throughout your system irrespective of valve position.

Heating

lectric

Record the following information regarding the electric heat.

· Total heater rating

· Thyristor size (if fitted)

· Current/ phase

Check that the overheat cut-out operates satisfactory.

The procedure for this is to enable the unit with electric heat enabled. With full heating

active turn off the MCB for the fans. The unit should go into alarm disabling the electric

heat. If the overheat cut-out does not cause an alarm within 3 minutes slight adjustment

to the position of the OHCO capillary must be carried out.

The Auto reset cut-out must trip before the manual reset.

Auto trip time 2.5 minutes

Manual reset 3 minutes

Care must be taken to ensure that the overheat cut-out does not become active when the

unit is at reduced airflow (such as in dehumidification)

Low Pressure Hot Water

Check operation of the Low pressure hot water coil valve. This can be done by changing

the heating setpoint causing the valve to open allowing hot water into the coil.

Hot Gas Re

heat

Check operation of the hot gas reheat control valves. During installation the solenoid

valves will be energised with magnetic coil lifters. The coils should have already been put

back on the valve body prior to energising the valve.

CAUTION

Failure to replace the solenoid head can cau

se component failure (overheating and

deforming)

Commissioning

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Airedale SmartCool 11-233kW Manuel d'utilisateur Page 169

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