7
APPLICATION DATA
Minimum and maximum evaporator water flow rates
30GY/GV Min flow rate, l/s Max. flow rate, l/s
020 1.2 4.8
025 1.6 8.0
030 1.6 8.0
035 2.4 9.4
044 3.2 16.0
049 3.2 16.0
059 4.8 18.4
Minimum operating temperature
°C
Single-speed motor 14
Two-speed motor 4
Dampers -20
Maximum chilled water flow rate
The maximum chilled water flow (>0,09 l/s per kW or <2.8 K
temperature difference) is limited by the maximum permitted
pressure drop in the evaporator.
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 10.8
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 10 times in
an hour.
Bad Good
Bad Good
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.
Preliminary checks
Check equipment received
• Inspect the unit for damage or missing parts. If damage is
detected, or if shipment is incomplete, immediately file a
claim with the shipping company.
• Confirm that the unit received is the one ordered.
Compare the nameplate data with the order.
• Confirm that all accessories ordered for on-site installation
have been delivered, and are complete and undamaged.
Moving and lifting the unit
Moving
Do not remove skids, pallets or protective packaging until the
unit is in its final position. Move the chiller using tubes or
rollers, or lift it, using slings of the correct capacity. Before
moving the unit, ensure that all panels are correctly fixed.
Lifting
Refer to dimensional drawings 99 DI-035 GY 500 250E and
the lifting instructions label on the unit.
(9 strony)
(245 strony)
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