Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 47)

47 Chiller Technical Manual 7267818 V1.4.0_04_2014
In
sta
lla
tio
n
Chillers DeltaChill™Air Cooled and FreeCool
Installation Data
Water Systems and Recommended Flow Schemes
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 pipe work 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 the NPSH (Net Positive Suction Head) incorporating a safety margin of 0.5m head must be
available at the pump inlet during operation
Interlocks & Protection
Always electrically interlock the operation of the chiller with the pump controls and water flow switch.
These safety devices prevent the chiller operating with low water flow which can cause serious damage.
2
1
CAUTION
Failure to install both safety devices 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 .
Flow Schemes
1 Water In 2 Water Out
Basic Supplied Water Schematic
(Includes Flow Proving Device)