Installation
Drainage
Provide a
Releasing the Nitrogen Holding Charge
The nitrogen holding charge can be released into the atmosphere.
CAUTION
When releasing nitrogen holding charge, ventilate the room. Avoid breathing in the nitrogen.
Water Connections (RTUB)
Thoroughly flush all water piping to the unit before making the final piping connections to the unit.
CAUTION
If using an acidic commercial flushing solution, construct a temporary bypass around the unit to prevent damage to internal components of the evaporator.To avoid possible equipment damage, do not use untreated or improperly treated system water.
When making the water connections, use flange connectors. Insulate all piping to reduce temperature increases and to prevent condensation. Figure 7 shows all the piping systems for the evaporator and its components.The arrangement of the pipes and the other components varies slightly according to the positioning of the connections and the water source.
CAUTION
The chilled water connections to the evaporator are Victaulic connections. Do not attempt to weld these connections, because the heat generated from welding can cause microscopic and macroscopic fractures on the cast- iron water
boxes that can lead to premature failure of the water box.
A vent line is located on the top part of the evaporator at the water return piping end. Install additional vent lines at the highest points in the piping to vent the air present in the chilled water circuit. Install manometers to monitor the pressure of chilled water entering and leaving the evaporator.
CAUTION
To prevent damage to
Provide shutoff valves in lines to the gauges, in order to isolate them from the system when they are not in use. Use rubber vibration eliminators to prevent vibration transmission through the water lines. If desired, install thermometers in the lines to monitor entering- and
"Piping components" include all devices and controls used to provide proper water system operation and unit operating safety.These components and their general locations are given in Figure 7.
Entering Chilled-Water Piping
•Air vents (to bleed air from system).
•Water pressure gauges with shutoff valves.
•Vibration eliminators.
•Shutoff (isolation) valves.
•Thermometers (if desired).
•Clean out tees.
•Pipe strainer.
CAUTION
Install a strainer in the evaporator- water inlet piping. Failure to do so can result in evaporator tube damage.
Leaving Chilled-Water Piping
•Air vents (to bleed air from system).
•Water pressure gauges with shutoff valves.
•Vibration eliminators.
•Shutoff (isolation) valves.
•Thermometers (if desired).
•Clean out tees.
•Balancing valve.
•Flow Switch
Evaporator Drain
A 3/4" drain connection is located under the outlet end of the evaporator water box.This may be connected to a suitable drain to permit evaporator drainage during unit servicing. A shutoff valve must be installed on the drain line.
Evaporator Flow Switch (accessory) The chilled water flow is protected by the
If additional protection of the chilled water flow proves necessary, connect a flow switch installed on site, or a differential pressure switch to control the system's water flow. Connect the flow switch in series with the auxiliary contacts of the chilled water pump motor starter. A special connector is supplied with the unit, with the wiring diagrams. Some piping and control schemes, particularly those using a single water pump for both chilled- water and hot water, must be analyzed to determine how and/or if a flow- sensing device will provide the desired operation.
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