Interklima Terminal Units
PCE -VS ñ Hydronic cassette
28
Controls specification
2 pipe hot and chilled hydronic cassette
With motorized valve, Master - Slave control motorized valve,
Master - Slave control & computer management system control
1.0 Abbeviations
Ts = Setting temperature
Tr = Room air temperature sensor
Ti = Indoor coil temperature sensor
AUX = Auxiliary contact
MTV = Motorized valve
2.0 Control system operation
2.A Master and Slave unit function
ñ The control board can be set either as a master unit or slave unit.
2.A.1 Master unit function
ñ The master unit sends data on its setting to the slave unit.
ñ The master unit settings are Unit ON/OFF, Mode,
Fan Speed, Set Temperature, Swing Function,
and Sleep Function (by wall pad only).
2.A.2 Slave unit function
ñ The slave unit receives data on its settings from the master unit.
ñ The slave unit is allowed to change to a locally desired
setting as long as there are no subsequent changes
to the settings of the master unit.
ñ The slave units can be set individually for sleep,
timer on and off function.
2.A.3 Master and Slave Installation
ñ When using remote handset, for the master unit ensure
the JP0 jumper is shorted and for the slave units JP0
is opened before turning ON the main power supply.
ñ When using wired wall pad, JP0 jumper will not function.
Use the wall pad to set master and slave units. The wall pad
screen will show unit number 00 for master unit, and unit
number 01-31 for slave units. See wired wall pad function guide
to see how to set master and slave unit.
ñ Connect master to slave units with telephone wire.
NOTE: Use 4-core cable and one-to-one configuration.
ñ When MAIN POWER SUPPLY is ON:
With motorized valve:
The master unit will respond with 3 beeps.
The slave unit will respond with 1 beep.
If there are beeping sounds from both master and slave
the JP0 on both units is shorted. So, there will be no
communication.
If there is no beep sound, no board is set as the master
unit. So, no communication will occur.
ñ Once the master unit receives the signal from the handset,
the master unit will send the data.
ñ The slave unit will respond after receiving the data.
2.B Computer management system
ñ You can connect the control PCB to your computer
management system through the RS-485 port direct to
your computer telephone port with a telephone line.
ñ Master-slave can also be operated through the CMS.
ñ The communication protocol is ASM. You can use your
CMS to check all units’ status, and control each unit
On/Off, Mode, Set Temperature, Valve open or close,
Swing function and Fan speed. You cannot control timer.
ñ The master unit can be connected with 31 slave units with
maximum distance of 1 KM.
2.C Air conditioner ON/OFF
There are 3 ways to turn the system on or off:
ñ By ON/OFF button on the handset or wired wall pad.
ñ By programmable timer on the handset or wired wall pad.
ñ By manual control button on the air conditioner.
2.D Power on setting
ñ When power on signal is received by the air conditioner,
the Mode, Fan Speed, Set Temperature and Swing
settings will be the same as the last handset settings
before the last power off.
2.E. Cool mode
ñ If Tr≥Ts+1
o
C, cool operation is activated. MTV is turned on.
AUX2 is closed. Indoor fan runs at set speed.
ñ If Tr≤Ts, cool operation is terminated. MTV is turned off.
AUX2 is opened. Indoor fan runs at set speed.
ñ The range of Ts is 16 to 30
o
C.
ñ Indoor fan speed can be adjusted for low, medium,
high and auto.
ñ When turned on, MTV requires 30 seconds before it is
fully open.
ñ When turned off, MTV requires 120 seconds before it is
fully closed.
ñ When the unit is turned off, indoor fan will delay for 5 seconds
before it is turned off.
2.E.1 Low temperature protection of indoor coil
ñ If Ti≤2
o
C for 2 minutes, MTV is turned off. AUX2 is opened.
If indoor fan is set for low speed, it will run at medium speed.
If it set at medium or high speed, it will keep running at the
same speed.
ñ If Ti≥5
o
C for 2 minutes, MTV is turned on. AUX 2 is closed.
Indoor fan runs at set speed.
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