Water systems and recommended flow schemes, Chillers deltachill, Installation data – Airedale DeltaChill FreeCool 110kW - 1080kW User Manual
Page 141
Chillers
DELTACHILL
™
Chillers
141
Installation, Commissioning and Maintenance Manual :7025232 12/ 2013
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.
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 or flow switch MUST be directly wired to the Chiller
in addition to the flow proving device, refer to
Flow Schemes
Key: 1
Water In
2
Water Out
Basic Supplied Water
Schematic
(Includes Flow Proving
Device)
TT
1
2
TT
FS