Trane RAUJ-C20 Installation, Operation And Maintenance Manual page 59

Figure 41. Optional flow switch
3-1/4"
4-7/8"
1-15/16"
Hex
3-1/2"
Install a flow switch or other flow sensing device to
prevent or stop the compressor operation if the water
flow drops below minimum limits. Locate the device in
the chilled water return line as shown
Install per switch manufacturer's instructions and refer
to the field wiring and unit schematics for the flow
switch electrical interlock connections. Adjust switch
trip point to prevent operation below minimum limits.
The water flow switch included in the EVP chiller
accessory kit must be adjusted to prevent flow below
the minimum limit. To set the flow limit:
1. Establish minimum water flow.
2. Rotate the flow switch adjustment screw until the
switch opens. This gets close to the correct setting
but final adjustment must be done without water
flow.
3. Beginning from water off, start flow and adjust
GPM until the switch trips. If flow rate is below
minimum, stop water flow and rotate adjusting
screw accordingly.
4. Repeat until the switch trips at or above minimum
flow.
N N o o t t e e : : Use pressure gauge(s) and Water Pressure Drop
table to determine water flow rate. See General
Data for minimum flow limits.
Air Vents
Vents must be installed at high points in the piping
system to facilitate air purging during the filling
process. Air vents between the system shut off valve
and heat exchanger are also useful for EVP chiller
service and shutdown.
Water Pressure Gauges
N N O O T T I I C C E E
E E v v a a p p o o r r a a t t o o r r D D a a m m a a g g e e ! !
D D o o n n o o t t e e x x c c e e e e d d 1 1 5 5 0 0 p p s s i i g g e e v v a a p p o o r r a a t t o o r r p p r r e e s s s s u u r r e e a a s s i i t t
c c o o u u l l d d r r e e s s u u l l t t i i n n d d a a m m a a g g e e t t o o t t h h e e e e v v a a p p o o r r a a t t o o r r . .
SS-SVX11K-EN
1-5/8"
1/2" NPT
1" NPT
1-1/8"
Figure 40, p. 57.
I I n n s s t t a a l l l l a a t t i i o o n n M M e e c c h h a a n n i i c c a a l l — — E E V V P P
Install pressure gauge(s) to monitor the entering and
leaving chilled water pressure, and strainer condition.
Water Shutoff Valves
Provide shutoff valves in the "Supply" and "Return"
pipe near the chiller so the gauge(s), thermostats,
sensors, strainer, etc., can be isolated during service.
Pipe Unions
Use pipe unions to simplify disassembly for system
service. Use vibration eliminators to prevent
transmitting vibrations through the water lines.
Thermometers
Install thermometers in the lines to monitor the
evaporator entering and leaving water temperatures.
Balancing Valves
Install a balancing cock (valve) in the leaving water line.
It will be used to establish a balanced flow.
N N o o t t e e : : Both the entering and leaving water lines should
have shutoff valves installed to isolate the
evaporator for service.
Chiller Drain
Drain piping, with shut off valve, must be installed at
the lowest point between the chiller and system piping
valves to allow water removal for service and shut
down procedures. The drain must be piped to a
suitable facility.
N N o o t t e e : : Insure that the drain is closed before filling
system with water.
Water Temperature Sensor
The temperature sensor and sensor well must be
installed in the leaving water piping as close to the
chiller as possible. Both devices are located inside the
remote panel. Thermal paste is also provided inside the
remote panel and must be used when installing the
sensor into the sensor-well.
N N O O T T I I C C E E
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o u u s s e e t t h h e e r r m m a a l l p p a a s s t t e e c c o o u u l l d d r r e e s s u u l l t t i i n n e e r r r r a a t t i i c c
t t e e m m p p e e r r a a t t u u r r e e s s e e n n s s i i n n g g r r e e s s u u l l t t i i n n g g i i n n e e q q u u i i p p m m e e n n t t
d d a a m m a a g g e e . .
A A l l w w a a y y s s u u s s e e t t h h e e r r m m a a l l p p a a s s t t e e o o n n t t e e m m p p e e r r a a t t u u r r e e s s e e n n s s o o r r
i i n n s s t t a a l l l l a a t t i i o o n n . .
Figure below illustrates the sensor well dimensions.
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