IM 725 (1-02)
13
In Water Systems
After flushing piping adequately, so all debris is removed, fill the
system.
At initial operation, vent manually by unscrewing the vent plug one or
two turns, figure 31. After venting, tighten the vent plug firmly.
Unscrew the vent plug only one or two complete turns. System
is under pressure and can result in severe personal injury
WARNING
!
Figure 31 - Vent and Drain Plug
Unscrew the vent plug one or
two turns to manually vent
system.
Water system under pressure. When venting keep face and
body parts well away, and vent slowly.
Figure 28 - Hot Water Coil Connections
Chilled Water Coil
Hot Water Coil
Chilled Water Return
Chilled Water Supply
Hot Water Return
Hot Water Supply
Water Coil Connections
Hook up water piping in accordance with the below figure’s 28 and 29
for hot water and chilled water coil connections.
Figure 29 - Chilled Water Coil Connections
Failure to install water piping to coils properly can result in
improper unit operation and possible coil freeze-ups.
Proper ventilation is required for brazing. When brazing, be sure to
protect unit ventilator components from overheating damage (melting
insulation, also damage to valves, wiring, electronics, sensors, etc.).
Before filling, be sure to flush all piping adequately so that all debris
is removed. Foreign debris can prevent proper valve operation, resulting
in overheating, overcooling, etc.
Ensure proper insulation of supply and return piping. Proper insulation
prevents loss of unit ventilator capacity, overheating of end
compartment, and / or moisture dripping.
The piping to and from the unit must be protected from outside air and
freeze conditions. The piping must be suitably insulated for
condensation or heat lose or gain. Penetrations entering the unit end
compartments must be fitted/sealed for unit integrity.
Figure 30 - Protect Components From Overheating Before Brazing
Use A Quenching Cloth
When Brazing, to Prevent
Overheating The Piping
Components (Avoid Valve
Damage and Eratic
Operation)
Vent
Drain Plug
CAUTION
!
WARNING
!
