Airedale SmartCool 11-233kW - Manual (Page 169)

Precision Air Conditioning SmartCool
TM
– 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
Electric 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 cause component failure (overheating and
deforming)
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