Trane CVHE Installation, Operation And Maintenance Manual page 24

Installation: Water Piping
Figure 12. Typical evaporator water piping circuit
2 1 7
6 8 2
1. Balancing Valve
2. Gate (Isolation) Valve or Ball
Valve
3. Thermometer (if field supplied)
4. Waterbox Nozzle Connection
5. Drain, Vent, Anode
(a) Flow switch 5S1 may be installed in either the entering or leaving leg
of the chilled water circuit.
(b) It is recommended to pipe the gauge between entering and leaving
pipes. A shutoff valve on each side of the gauge allows the operator to
read either entering or leaving water pressure.
Figure 13. Typical condenser water piping circuits
Outlet
4 5 3
2
10
2
Inlet
4 5 3
1. Balancing Valve
2. Gate (Isolation) Valve or Ball
Valve
3. Thermometer (if field supplied)
4. Waterbox Nozzle Connection
5. Drain, Vent, Anode
Notes:
1. Some type of field-supplied temperature control device may be
required to regulate the temperature of the heat-recovery condenser
water circuit. For application recommendations, refer to Heat
Recovery Seminar (Part 2): "Systems/Equipment (AM-FND-8).
2. Install a bypass valve system to avoid circulating water through the
auxiliary shell when the unit is shut down.
3. On multiple pass condensers, entering condenser water must enter at
the lowest nozzle.
(a) Flow switch 5S2 may be installed in either the entering or leaving leg
of the chilled water circuit.
(b) It is recommended to pipe a single gauge between entering and leaving
pipes.
Piping must be arranged and supported to avoid stress on
the equipment. It is strongly recommended that the piping
contractor does not run pipe closer than 3 feet
(0.91 meters) minimum to the equipment. This will allow
for proper fit upon arrival of the unit at the job site. Any
adjustment that is necessary can be made to the piping at
24
Outlet
3 5 4
2
9
2
Inlet
3 5 4
6. Strainer
7. Chilled Water Flow Switch
(a)
(5S1)
8. Pump
(b)
9. Pressure Gauge
7 1 2 8
2 9
6. Strainer
7. Condenser Water Flow
(a)
Switch (5S2)
8. 3-Way Valve (Optional)
9. Condenser Water Pump
(b)
10. Pressure Gauge
that time. Expenses that result from a failure to follow this
recommendation will not be paid by Trane.
Water piping connection sizes and components are
identified in Table 3, p.
p. 26. Remember that with many waterboxes the entering
and leaving evaporator water can be piped to either
waterbox connection when the tube bundles are split
vertically. However, large evaporator waterboxes, with
entering and leaving connections not at the same level,
must be connected with the entering water at the bottom
and the leaving water at the top.
Waterboxes with multiple pass arrangements utilize a
baffle to separate the passes. These baffles are designed
for a maximum pressure of 20 psid (137.9 kPaD). If larger
pressure drops are expected in the application, contact
your local Trane representative to discuss special
waterbox options.
Important: Water flows must be piped in accordance
with nameplate designation.
Field-provided isolation valves for the evaporator and
condenser water lines should be installed upstream and
downstream of the heat exchangers, and be installed far
enough away from the chiller to also provide practical
service isolation for flow sensing devices, field
thermometers, flexible connectors, and any removable
pipe spools.
Ensure that the evaporator water piping is clear, check it
after the chilled water pump is operated but before initial
chiller start-up. If any partial blockages exist, they can be
detected and removed to prevent possible tube damage
resulting from evaporator freeze-up or erosion.
For condenser and large evaporator connections, arrange
the water piping so that the water supply enters the shell
6
at the lower connection, and exits from the top connection.
Operational problems may result if this piping is not
correct. Some shells may be piped as desired since both
connections are at the same level.
For applications that include an "infinite source" or
"multiple-use" , cooling condenser water supply, install a
valved bypass "leg" (optional) between the supply and
return pipes. This valved bypass allows the operator to
short-circuit water flow through the cooling condenser
when the supply water temperature is too low. For
additional application information, refer to Engineering
Bulletin: Condenser Water Temperature Control - For
CenTraVac Centrifugal Chiller Systems with Tracer
AdaptiView Controls (CTV-PRB006*-EN).
Note:
• System refrigerant pressure differential must be
maintained above 3 psid (20.7 kPaD) at all times.
Failure to do so could result in operating problems.
• Whenever a CVHE, CVHF , or CVHG unit is equipped
with an auxiliary condenser, use a bypass valve system
to avoid circulating water through the auxiliary shell
during unit shut-down.
25, Table 4, p. 25, and Table 5,
CVHE-SVX02H-EN