21
CAUTION - Equipment Damage!
After water system clean and leakage test, fully drain the water from evaporator and piping system.
Use pressurized air or nitrogen to blow out and ensure that no water stay in the evaporator and
piping in winter.
CAUTION - Equipment Damage!
All inlet and outlet shutoff valves shown in
should be always open to enable water circulated
by UC800 controlled pump to avoid freezing when the units in operation or standby condition.
Figure 8 Typical chilled water piping system diagram
[3
d
SHUTOFF VALVE
WATER PUMF
PRESSURE GAGE
INDOOR UNIT [J
EXPANSION TANK
VIBRATION
ELIMINATOR
-w
CHECK VALVE
©
THERMOMETER
RELIEF VALVE
l=?
WATER STRAINER
BALANCE VALVE
©
FLOW SWITCH
AIR VENT VALVE
Entering Water Piping
• Water strainer
• Vibration eliminators
• Water pressure gauges with shutoff valves
• Thermometers (if desired)
• Shutoff (isolation) valves
• Drain valve
Leaving Water Piping
• Drain valve
• Shutoff (isolation) valves
• Vibration eliminators
• Balancing valve
• Thermometers (if desired)
• Flow switch
• Water pressure gauges with shutoff valves
• Air vents (to bleed air from system)
Minimum Water Loop Volume
In order to obtain leaving water temperature stability for comfort cooling applications, a minimum water loop
volume of 9 liters per kW is recommanded on all unit sizes. If the total water system volume lower than
required, including water volume of evaporator, water piping and indoor unit, it may be necessary to add a
tank or increase pipe sizes to provide sufficient liquid volume. Any storage tank that is placed in the water
loop should have internal baffles to allow thorough mixing of the fluid.
