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Application
Considerations
Evaporator hydraulic piping
components
The figure below shows how to proceed
with the installation of the water piping.
An air purge is placed on the evaporator
and at the water outlet. Provide additional
air purges at high piping points to release
it from the chilled water system.
Evaporator Drain
The evaporator drain connection must be
piped to an available strainer in order to
drain the evaporator even during operati-
on. Install a gate valve in the drain line.
Thermometers and
Manometers
It is essential to install thermometers (ite-
ms 5 and 12 in the figure) and
manometers (item 9) at the chilled water
inlet and outlet. These instruments must
be installed close to the unit, with a maxi-
mum scale of 1°C for thermometers and
0,1 kgf/cm2 for manometers.
Important: In order to avoid evaporator
damages, do not exceed a 150-psig wa-
ter pressure.
The manometer with connection should
be installed at water inlet and outlet accor-
ding to item 9 in the figure below in order
to avoid reading mistakes. Manometers
and thermometers must be installed at the
appropriate height to avoid parallax errors*.
Thermometers must be of glass or mer-
cury-scale type, with colored contrasting
fluid, and provide easy reading.
- Manometers must be equipped with
siphons;
- Install gate valves to isolate the manome-
ters when they are not being used.
Use piping joints to facilitate assembly and
disassembly services.
Inlet and outlet must be equipped with
gate valves to isolate the evaporator during
service, and a globe valve must be instal-
led at the outlet to adjust the water flow.
Flow-Switch
Verify that safety interlockings, particularly
the flow-switch, are installed in straight and
horizontal runs, with vanes adequate to the
pipe diameter, and the distance from cur-
ves and valves must be at least 5 times its
diameter, on each side.
Water treatment
The use of untreated or improperly treated
water may result in scaling, erosion, corro-
sion, algae and slime. The services of a
qualified water treatment specialist should
be engaged to determine what treatment,
if any, is advisable. Trane do Brasil assumes
no responsibility for equipment failures
resulting from the use of untreated or
improperly treated water.
Legend
1 - Drain
2- Joint
3- Flexible Connection
4- Water Flow Switch
5- Thermometer
6- Globe Valve
7- Cage Valve
8 - Air Purge
9- Manometers with cage valves
10- Joint
11- Flexible Connection
12- Thermometer
13- Water Filter
14- Cage Valve
E- Water Inlet
S- Water Output
* Parallax error: Apparent displacement of an object, when the observation point changes. It is especially said of the apparent deviation of a measure instrument needle, when it is
not observed from a vertical point of view (parallax error).
Fig. 01 - Components
