Check Of High Pressure Switch (Cooling Operation); Check Of Low Pressure Cut Control; Temperature Controller; Check Of Refrigerant Leakage - Hitachi RCUE40AG2 Service Manual

Test run

Cooling operation:

NOTE:
See "HIgh pressure
confi rmation" in
chapter 4 "Control
functions" for the
details.

Fig.9

CAUTION:
It is recommended that
this confi rmation test
be performed at load-
up state, operation for
a few minutes after
start-up.
pag. 26

2.3.1. Check of high pressure switch (cooling operation)

1. Operate the unit in local operation mode.
2. When "High pressure cut confi rmation test" switch on PCB is pressed during
local operation, fan is stopped forcedly and high pressure is increased. Then,
high pressure switch turns ON. (Alarm stop) This confi rmation switch is set in
every cycle (see fi g.9) (to restart the compressor, high pressure switch must be
rearmed manually next to each compressor)
3. After confi rmation, alarm should be released by unit stop operation. When alarm
is released, high pressure cut confi rmation test is also released.

2.3.2. Check of low pressure cut control

Low pressure is decreased by closing the stop valve. Then, low pressure cut
device is activated (Alarm stop).
<Activation conditions for low pressure cut control>
Activated in 3 seconds at low pressure sensor detection pressure of below
0.049MPa

2.3.3. Temperature controller

It is diffi cult to check the temperature controller accurately in an installation place,
however, the following method helps to grasp the setting state roughly.
1. Temperature controller is set in high temperature side for chilled water, and in
low temperature side for warm water.
2. Measure the set temperature at compressor stop, and compare it with actual
inlet water temperature.

2.3.4. Check of refrigerant leakage

It is possible for screws to be loosened at delivery. Take 10~15 seconds at least in one
position to check the leakage.
SMGB0003 rev.0-01/2007