ULTIMA 2000
Chillers
Chillers
Installation & Maintenance Manual : 903-099 IM E 05/00
7
General Description
REFRIGERATION
Each refrigeration circuit is supplied with the following:
as TM
•
Full operating charge of R407C
•
Liquid injection oil cooling circuit fitted to each compressor as standard with sight
glass, strainer and non-return valve
•
Thermostatic expansion valve with external equaliser
•
Liquid line ball valve
•
Discharge line ball valve
•
Liquid line solenoid valve
•
Large capacity filter drier with replaceable cores
•
Liquid line sight glass
•
Low pressure switch with manual reset
•
High pressure switch with manual reset
•
Suction and liquid pressure transducers
•
Pressure relief valve with integral rupture disc and indicator gauge
CONTROLS
Microprocessor controller to provide between 6 to 8 stages of capacity control (dependant
upon model size) as standard. The controller incorporates full Building Management
System capabilities, full details can be found in the
Controls
section
.
as TM
ELECTRICAL
A weatherproof electrical power and controls panel is situated at the end of the unit
and contains:
as TM
•
Individual mains power compartments for each refrigeration circuit
•
Separate door locking electrical isolation for each mains compartment
•
Emergency Stop fitted to controls compartment door
•
Separate, fully accessible, controls compartment, allowing adjustment of control
set points whilst the unit is operational
•
Dedicated bus-bar chamber for connection of incoming 3 phase and earth mains
power supply
•
Circuit breakers for protection of all major unit components
•
Phase Rotation Relay also incorporating loss of phase protection
•
The electrical power and control panel is wired to the latest European standards
and codes of practice
OPTIONAL EXTRAS - ENERGY SAVING
as TM
Power Factor Correction
When applied to the motors of each compressor, the compressor power factor is
controlled to a minimum operating value of 0.95 at the full operating capacity. This
satisfies many supply authorities that may impose surcharges on equipment with power
factor less than 0.95.
Electronic Expansion
Valves
Electronic expansion valves differ to the normal thermostatic expansion valves in their
ability to maintain control of the suction superheat at reduced head pressures. This can
lead to significant energy savings particularly at minimum loading and low
ambient temperatures.
Modulating Head
Pressure Control (-20°C)
Model D Only
A 3 phase head pressure controller which modulates the fan speed to maintain a constant
condensing pressure can be fitted on request.
