Ultima Compact™
Chillers
22 Ultima Compact 30-150kW Technical Manual 9690553 V1.2.0_10_2019
Installation
Water System
Chilled water pipework and ancillary components must be installed in accordance with:
● National and local water supply company standards.
● The manufacturer's instructions when fitting ancillary components.
It is also required:
● That the system water is treated to prevent corrosion and algae forming.
● In ambients of 0°C and below, where static water can be expected, or when water supply temperatures of +5°C
or below is required, the necessary concentration of Glycol or use of an electrical trace heater must be included.
● The schematic is referred to as a guide to ancillary recommendations.
The water flow commissioning valve set is not shown in the diagram overfeaf, as the valve can be fitted elsewhere within
the chilled water circuit.
Component Recommended Requirements
The recommended requirements to allow commissioning to be carried out correctly are:
● The inclusion of binder points adjacent to the flow and return connections, to allow temperature and pressure
readings.
● A flow switch or equivalent, fitted adjacent to the water outlet side of the chiller.
● A 20 mesh strainer fitted prior to the evaporator inlet.
● A water-flow commissioning valve set fitted to the system.
● In multiple chiller installations, 1 commissioning valve set is required per chiller. Air vents are to be installed at
all high points and where air is likely to be trapped at intermediate points.
● Drain points are to be installed at all low points in the system and in particular adjacent to the unit for
maintenance to be carried out.
● Isolating valves should be installed adjacent to all major items of equipment for ease of maintenance.
● Balancing valves can be installed if required to aid correct system balancing.
●
All chilled water pipework must be insulated and vapour sealed to avoid condensation.
● If several units are installed in parallel adjacent to each other, reverse return should be applied to avoid
unnecessary balancing valves.
Pump Statement
When installing circulating water pumps or equipment containing them, the following rules should be applied:
● Ensure the system is filled with water then vented and the pump primed with water before running the pump.
This is required because the pumped liquid cools the pump bearings and mechanical seal faces.
● To avoid cavitation a minimum of 0.5m NPSH (Net Positive Suction Head) must be available at the pump inlet
during operation.
Interlocks and Protection
Always electrically interlock the operation of the chiller with the pump controls and water flow switch for safety reasons.
Failure to do this will invalidate the chiller warranty. Do not rely solely on the BMS to protect the chiller against low flow
conditions. An evaporator pump interlock and flow switch MUST be directly wired to the chiller, refer to Interconnecting
Wiring diagram.
The unit water connections are NOT designed to support external pipework, pipework should be
supported during installation.
CAUTION
Constant water flow MUST be maintained. Variable water volume is NOT recommended and may
invalidate warranty.
The correct operation of the flow switch is critical if the chiller warranty is to be valid.
CAUTION
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