Operation Error/Wrong Setting Prevention Control [40 - 40]; Forced Capacity Control - Hitachi RCUE40AG2 Service Manual

Control system

Operation error/wrong setting
prevention control [40-40]:


Forced capacity control:


NOTE:
This control is individual
for each compressor.
pag. 57
4.7. Operation error/wrong setting prevention control [40 – 40]
Alarm is output in the following cases.
1. Operation error
While the unit is stopped, there is a input (including external Thermo signal) from
−
the remote controller in spite of local operation mode.
However, alarm is not indicated if there is a local input (operation switch of unit
−
body) while the unit is stopped in remote operation mode.
2. Local /Remote operation error
To switch local  remote or remote  local while the unit is running, unit is
−
stopped and alarm is output. [40-40]
3. Cooling/Heating operation error
To operate heating during cooling or to operation in cooling during heating, unit is
−
stopped and alarm is output. [40-40]
4. Wrong setting of Dip Switch
Dip Switch is set wrongly, alarm is indicated at power ON.
−

4.8. Forced capacity control

This is a control to do Thermo OFF forcedly or to be shifted to the desired capacity by a
external control.
Since it is possible to change the operation capacity forcedly according to the load, it is
very useful if it is needed to control the temperature by a external signal.
1. Forced Thermo OFF function
a) Contents
In case that it is required to stop a compressor temporally, the order can be
given forcedly through the customer wiring terminals. After receiving this signal,
compressor shall be Thermo OFF forcedly. When this order is released, normal
operation is performed.
Unit
Running operation
External
signal
b) Wiring method (custormer wiring terminal)
Wire as follows (n: nº of compressor).
SMGB0003 rev.0-01/2007
Automatic operation
Thermo OFF
by Thermo
Automatic operation
by Thermo
4 4