Start Up; Preliminary Checks; Start Up Of The Plant Per Unit; Start Up Procedure - Trane CXAO Installation Operation & Maintenance

Start up

6 Start up
6.1

Preliminary checks

Before starting the appliance is very important verify
that you have correctly performed all the operations
described in the section "PREPARATION OF STARTING. "
Also check that all mechanical and electrical equipment
are tightened properly. WARNING! particular should
be paid to the fundamental components (compressor,
heat exchangers, fans, electric motors, pumps, terminal
blocks) are detected in the case fi xing screws loose,
proceed to their tightness before fi rst start up.
The oil heaters should be placed at least 8 hours before
starting. Make sure that the compressor crankcase is
warm. Check that all valves in the refrigerant circuit are
open. Check all equipment connected to the unit.
6.2 Start up
Start the unit by pressing the ON / OFF button. From
the moment you give the request for unit start up, the
moment at which you start the (fi rst) compressor, will
spend a fi xed time. After switching off at the next start of
the same compressor will spend a confi gured time set
by the unit controller.
Check the direction of rotation of the fans and
compressors. If wrong, reverse two phases of power.
Make sure that all safety devices are working properly
and control. Check the temperature of the water leaving
the evaporator and adjust the settings of control. Check
the oil level.
6.3

Start up of the plant per unit

During the operation of the system, in order to preserve
each component of the unit and to optimize the use of
the same, you need to get heat into the circuit before
giving cooling energy to utilities.
For this purpose, it must operate in the following way:
start the unit waiting until the temperature of the inlet
water to the unit is the proper steady state operation.
Follow the above procedure at each stop of the plant, of
such duration as to raise the temperature of the water
contained in it.
6.4

Start up procedure

Unit start up (only authorized person)
1. With the switch closed, open the electrical panel and
exclude compressor (refer to the wiring diagram on
the unit). Close the panel, set switch to "ON" (to give
power to the unit).
48
2. Wait for the start of the microprocessor and control.
Make sure that the temperature of the oil is hot
enough. The oil temperature must be at least 5 °C
higher than the saturation temperature of the
refrigerant inside the compressor.
3. Place the unit in the "ON" and wait until the unit is
indicated on the display-On
4. Turn the pumps (if with inverter) at max speed.
5. Verify that the loss of load of the evaporator is
equal to that of the project and correct if necessary.
The loss of the charged must be measured from
the connections of evaporator piping placed and
provided as standard. Do not measure the load
losses in points where they are interposed any
valves and / or fi lters.
6. Check for air in cleaning Filters, and then draining
the system.
7. Return the pump to the factory setting
8. Turn off the power (into standby mode) and make
sure the pumps stop after about 2 minutes
9. Verify that the local temperature setpoint is set to the
required value by pressing the Set button
10. Turn the main switch to "OFF" . Open the cabinet.
Reactivate the compressors. Push in the picture. Turn
the main switch to "ON" (to give power to the unit).
11. Wait for the start of the microprocessor and control.
Just put in "ON" circuit # 1
12. When the compressor is started, wait about 1 minute
for the system begins to stabilize.
13. Check the pressure of evaporation and condensation
of refrigerant.
14. Verify that all fans start and modulate properly in
according to the operating cycle.
15. Verify that, after a period of time necessary for the
stabilization of the refrigerant circuit, the liquid
indicator placed on the inlet pipe to the expansion
valve is completely fi lled (no bubbles), and that
the moisture indicator signs 'Dry'. The passage of
bubbles within the liquid indicator, it may indicate a
low amount of refrigerant, or an excessive pressure
drop through the fi lter drier, or an expansion valve
blocked at the maximum opening position.
16. In addition to checking the sight glass, check the
operating parameters of the circuit controlling:
a) Overheating compressor suction
b) Overheating compressor discharge
c) Subcooling of the liquid exiting the condenser
coils
d) Evaporation pressure
e) Condensing pressure
RF-SVX003A-GB