Viconics VWZS Application Guide - Manual (Page 16)

16
How To Test and Balance the Minimum, Maximum and Heat Flow Values:
Balancing Minimum Air Flow
1. Be sure local system heating is allowed by setting the outdoor heating lockout value at the RTU
controller (H Lock)
2. Be sure the system is currently in heating mode. As viewed locally at the RTU controller by pressing
the manual scroll button and displaying the local Zone Sequence = Heat message prompt.
3. Be sure that the master voting zones are calling for heating by setting the appropriate set points
accordingly.
4. Set the currently balanced controller set point to its minimum value. An example of this would be
60F or when the set point is at least 7-8 F lower than the current room temperature. This will drive
the VAV zone to its minimum value.
5. Set the (Min Pos) configuration parameter to the desired value as required by balancing.
Balancing Maximum Air Flow
1. Be sure local system heating is allowed by setting the outdoor heating lockout value at the RTU
controller (H Lock)
2. Be sure the system is currently in heating mode. As viewed locally at the RTU controller by pressing
the manual scroll button and displaying the local Zone Sequence = Heat message prompt.
3. Be sure that the master voting zones are calling for heating by setting the appropriate set points
accordingly.
4. Set the currently balanced controller set point to its minimum value. An example of this would be 60F
or when the set point is at least 7-8 F lower than the current room temperature. This will drive the VAV
zone to its minimum value.
5. Set the (Max Pos) configuration parameter to the desired value as required by balancing.
Balancing Maximum Heat Flow
1. Be sure local system cooling is allowed by setting the outdoor cooling lockout value at the RTU
controller (C Lock).
2. Be sure local reheat is allowed by appropriately setting the outdoor reheat lockout value at the Zone
controller (AO2 OALK or BO5 OALK).
3. Be sure the system is currently in cooling mode. As viewed locally at the RTU controller by pressing
the manual scroll button and displaying the local Zone Sequence = Cool message prompt.
4. Be sure that the master voting zones are calling for cooling by setting the appropriate set points
accordingly.
5. Set the currently balanced controller set point to its minimum value. An example of this would be 60F
or when the set point is at least 7-8 F lower than the current room temperature. This will drive the VAV
zone to its minimum value.
6. Set the (MaxHTPos) configuration parameter to the desired value as required by balancing.
Please note that:
- 0 to 100 % is directly converted to 0 to 10 VDC on the VAV damper output. If the actuator has a
positioning input range of 2 to 10 VDC, then entering 50% minimum position is not directly
converted to 50% VAV damper position. Please refer to table below
VAV damper
position required
0% 10% 20% 30% 40% 50% 60% 70% 80% 100%
Setting for 0-10
VDC Actuator
0% 10% 20% 30% 40% 50% 60% 70% 80% 100%
Setting for 2-10
VDC Actuator 0 to
20%
28% 36% 44% 52% 60% 68% 76% 84% 100%