AIREDALE CR12 - Page 31

Commissioning Checklist
Control Device Adjustment
On - O󰀨 Pressure Switch
The control device comprises a pressure switch with on/o󰀨 contact which cycles operation of the fan as a function of the
pressure; the contact:
• Closes and feeds the fan motor when the pressure rises and reaches the set point (29 barg)
• Opens when the pressure falls to a level equal to the set point value, minus the di󰀨erential pressure pre-set (23
barg)
This type of control system is suitable where ambient temperatures seldom fall below 0˚C.
In cold climates it could cause excessive hunting of the system.
The values of Set and Di󰀨erential are adjusted by means of the adjusting screws which are accessed by removing the
external casing of the pressure switch.
Factory setting: Set = 26 barg
Di󰀨erential = 6 barg
Optional EC Fans
When the condenser is matched to an Airedale indoor unit, head pressure control is provided by the indoor unit.
The fan speed of unmatched condensers is controlled by the onboard EC fan electronics connected to a pressure
transducer on the outlet manifold.
CAUTION
All fans are supplied pre-programmed to a head pressure setpoint of 26 barg and proportional band setpoint of 5 barg
unless otherwise specied at order.
CR12 - CR165 50/60HzCONDENSERS
31
Condenser Technical Manual 6666879 V2_02_2020
Technical