7
APPLICATION DATA
Minimum cooler water flow rates
30GH/GZ
Min flow rate, l/s
040-045
3.6
050-060
4.0
085-095
6.0
100-120
8.5
130
9.8
145
12.1
150
9.8
160-245
12.1
Maximum chilled water flow rate
The maximum chilled water flow is limited by the maximum
permitted pressure drop in the evaporator. It must have a
minimum temperature difference at the evaporator of 2.8 K,
corresponding to a flow rate of 0,9 l/s per kW.
Water loop volume
Whatever the size of the system, the water loop minimum
volume is given by the following formula:
Volume = CAP (kW) x N* = litres
where CAP is the nominal system capacity (kW) at the nominal
operating conditions of the installation.
Application
N
Air conditioning
3.25
Industrial process cooling
6.5
Low temperature operation
6.5
This volume is necessary for stable operation and accurate
temperature control.
It is often necessary to add a buffer water reservoir to the
circuit in order to achieve the required volume. The reservoir
must itself be internally baffled in order to ensure proper
mixing of the liquid (water or brine). Refer to the examples
below.
NOTE: The compressor must not restart more than 6 times in
an hour.
INSTALLATION
SAFETY CONSIDERATIONS
Installation, start-up and servicing this equipment can be
hazardous due to system pressures, electrical components and
equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start-up and service this equipment.
Untrained personnel can perform basic functions, such as
cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe precautions in the
literature, and on tags, stickers, and labels attached to the
equipment.
•
Follow all safety codes.
•
Wear safety glasses and work gloves.
•
Use care in handling, rigging and setting down bulky
equipment.
WARNING: Before doing any work ensure that the power
supply (400 V and 230 V) is disconnected, and switches and
isolators are opened and tagged.
During operation some parts of the unit reach or exceed
temperatures of 70°C (e.g. compressor discharge side,
discharge line). Only trained and qualified engineers, aware of
these hot surfaces, are allowed to perform maintenance
operations.
Bad
Good
Bad
Good
