APEN GROUP SPA reserves the right to contribute the necessary modifications to the documentation or documentation
32
cod. HG0130.05GB ed.B-2104
PCH
33
cod. HG0130.05GB ed.B-2104
PCH
PCH cold storage generator module
H51 = 1
HG0130.00 A 034
PCH ON/OFF Control
The ON/OFF control (ON/OFF terminals) protects the Air
Handling or Roof Top unit operation by stopping the burner(s)
when required.
The ON/OFF control provides the OK signal applied to ALL PCH
heater modules to which it is connected.
All the other safety devices must be connected in series to this
control (fire dampers, fan control, temperature alarms...) to
protect the system operation by stopping the burner.
Acting as a monitoring device for the heater, this control must
always be closed.
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IMPORTANT:
• Do not use jumpers on the terminals to which the ON/
OFF control is connected; connect the safety devices
to the ON/OFF terminals;
• The control has priority over the adjustment signals;
• The ON/OFF control is 230 V supplied.
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PCH Adjustment
The PCH heater allows three power adjustment modes:
•
0-10 Vdc;
•
ModBus;
•
NTC1 temperature probe.
To correctly set the adjustment parameters, d0 parameter
must be programmed, which identifies the type of adjustment
associated with the PCH heater.
Function
Equipment
PCH heater
Flame modulation
d0=2
NTC1
d0=5
0-10Vdc
d0=7
Modbus
PCH 0-10 Vdc modulating signal
THE PCH heater operation can be adjusted with a 0-10 Vdc
power modulating signal by connecting to 0Vdc and +10Vdc
terminals.
The module is preset for 0-10Vdc operation.
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ATTENTION:
Do not exceed the voltage limit value of 24V.
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This type of adjustment can be carried out directly from the CPU-
SMART PCB through the interface panel by setting parameter
d0=5 (default value set).
Modulating function and ON/OFF
The default operation type is shown in the diagram below.
The burner linearly modulates the output percentage between
V
ON
and 10Vdc, but:
•
as input voltage decreases: if it is lower than V
ON
the burner
will run at minimum power until its value is higher than V
OFF
and if it drops below V
OFF
, the burner will be switched off;
•
as the input voltage increases: if it is lower than V
ON
the
burner remains off; when it exceeds V
ON
value, it switches
on and starts modulating.
Through parameters H52 and H53, V
OFF
and V
ON
values can
be changed.
Modulation operation and ON/OFF
