Airedale Air Cooled Condensers R410A - Manual (Page 19)

Condensers CR12
– CR105
Condensers
19
Installation & Maintenance : 6680953 V1.2.0 02/2013
Commissioning Data
CONTROL DEVICE ADJUSTMENT
On-Off Pressure Switch The control device comprises a pressure switch with on/off 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
differential 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 Differential 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
Differential = 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 specified at order.