Camus Hydronics Valiant FT VA0080, Manual

Page: 32 / 79

25
5.4.3 CH Mode 2: Full Outdoor Reset Operation
Description Programming Instructions
•
Boiler
operates at
variable
Setpoint set
by the
outdoor
reset curve.
•
This mode
will only
function
when an
outdoor
temperature
sensor is
connected.
•
Heat
demand is
generated
indefinitely
with Night
Setback
1) On the digital display, follow the
previous instructions to enter into
the ‘Boiler Parameters’ settings
and set the CH Mode to 2.
2) Scroll down to parameters
‘Design
Supply Temp.’
,
‘Design Outdoor
Temp.’
,
‘Baseline Supply Temp.’
,
‘Baseline Outdoor Temp.’
and
adjust all the parameters required
to set the curve as previously
described.
3) The ENABLE/DISABLE contact on
Terminal Block 1 (TB1-2, TB1-4)
may be opened by a relay, such
as one connected to an external
clock, to lower the Setpoint at
night, decreasing the CH_Setpoint
to the value set in the
Night_Setback_Temp parameter.
CH Mode 2 functions very similar to CH Mode 1 with the
exception of the manner in which the ENABLE/DISABLE
contact is used. In CH Mode 2, the enable/disable contact
is used to enable or disable the night setback function. So,
with a relay attached to a clock, the ENABLE/DISABLE
contact is used to enable the night setback function to lower
the setpoint of the boiler over time periods when heat is not
being needed.
5.4.4 CH Mode 3: Permanent Heat Demand Operation
Description Programming Instructions
•
Boiler
operates with
a permanent
heat demand
maintaining
the Supply
temperature at
the Setpoint
Temperature
• Modulates on
Boiler supply
sensor
1) On the digital display, follow the
previous instructions to enter into
the ‘Boiler Parameters’ settings
and set the CH Mode to 3.
2) Scroll down to parameters ‘Design
Supply Temp.’
,
‘Design Outdoor
Temp.’ , ‘Baseline Supply Temp.’ ,
‘Baseline Outdoor Temp.’
and
adjust all the parameters required
to set the curve as previously
described.
For this mode the CH_ Mode should be set to 3, no outdoor
sensor is needed. The supply temperature is kept
constantly at the setpoint temperature. When the room
thermostat contact opens
CH_Setpoint
will be decreased
with Night_Setback_Temp .
In this condition the pump is always ON.
Note: ‘The pump start every 24 hours’-function is not
performed during this mode. In this mode the pump will be
running continuously.
5.4.5 CH Mode 4: Analog Input Operation – Setpoint
(0-10Vdc Signal)
In this mode of operation, the boiler CH setpoint is
controlled by an analog input signal provided by a remote
means such as a Building Management System or a system
controller. The analog input 0-10 Vdc is used to adjust the
boiler setpoint between the
CH_Setpoint_Min
and the
CH_Setpoint_Max
settings.
Description Programming Instructions
• Boiler
operates at
variable
Setpoint
decided by
the 0-10V
input signal
•
Modulates
on Boiler
inlet sensor
1. On digital display, use UP and
DOWN buttons to scroll to “CH
Demand”.
2. In settings, scroll down to
parameters
‘CH Min Setpoint’
and
set your setpoint at minimum signal.
Scroll to
‘CH Max Setpoint’
and set
your setpoint to maximum signal.
3. Place Remote/Local switch into
“LOCAL”.
4. CH Setpoint can be changed by
selecting CH Setpoint on the Digital
Display screen.
5.4.6 CH Mode 5: Analog Input Operation – Power
Output (0-10Vdc Signal)
In this mode of operation, the boiler power output (fan
speed) is controlled by an analog input signal provided by a
remote means such as a Building Management System or
a system controller. The analog input 0-10 Vdc is used to
adjust the boiler power output between the
Fan_Speed_Minimum
and the
Fan_Speed_Maximum
settings.
The minimum modulation analog input signal value will
correspond to the
Fan_Speed_Minimum
parameter.
The maximum modulation analog input signal value will
correspond to the
Fan_Speed_Maximum
parameter.