Viconics VWZS Application Guide User Manual
Page 11
11
Example 2 with 3 voting master zones only
Voting Zone 1
Voting Zone 2
Voting Zone 3
RTU Control Type
Current heat
demand
Current heat
demand
Current heat
demand
Highest
Average of 3
highest
100% 0% 0%
Heat weight set Heat weight set Heat weight set
100% 100% 100%
Resulting heat
weight to RTU
Resulting heat
weight to RTU
Resulting heat
weight to RTU
100%
0%
0%
100%
33.3%
Current cool
demand
Current cool
demand
Current cool
demand
0% 100% 100%
Cool weight set
Cool weight set
Cool weight set
100% 75% 75%
Resulting cool
weight to RTU
Resulting cool
weight to RTU
Resulting cool
weight to RTU
0%
75%
75%
75%
50%
It can be seen here that the resulting demand used by the RTU controller for the three master voting
zones are different and will result in different heating and cooling action simply based on the RTU
configuration.
•
If the RTU is set to Control Type = Highest demand, the current action delivered by the RTU
will be heating.
•
If the RTU is set to Control Type = Average of 3 Highest demand, the current action
delivered by the RTU will be cooling.
Example 3 with 5 voting master zones only
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
Voting
Zone 4
Voting
Zone 5
RTU Control Type
Current heat
demand
Current heat
demand
Current
heat
demand
Current
heat
demand
Current
heat
demand
Highest Average
of 3
highest
Average
of 5
highest
100% 0%
50%%
50%
0%
Heat weight
set
Heat weight
set
Heat
weight set
Heat
weight set
Heat
weight set
100% 100% 100% 50% 100%
Resulting
heat weight
to RTU
Resulting
heat weight
to RTU
Resulting
heat
weight to
RTU
Resulting
heat
weight to
RTU
Resulting
heat
weight to
RTU
100%
0%
50%
25%
0%
100%
58.3%
35%
Current cool
demand
Current cool
demand
Current
cool
demand
Current
cool
demand
Current
cool
demand
0% 100%
0%
0%
100%
Cool weight
set
Cool weight
set
Cool
weight set
Cool
weight set
Cool
weight set
100% 50% 50% 50% 75%
Resulting
cool weight
to RTU
Resulting
cool weight
to RTU
Resulting
cool
weight to
RTU
Resulting
cool
weight to
RTU
Resulting
cool
weight to
RTU
0%
50%
0%
0%
75%
75%
41.7.3%
25%
It can be seen here that the resulting demand used by the RTU controller for the five master voting
zones are different and will result in different heating action simply based on the RTU configuration.
Please note that the heating or cooling action delivered to the zones is also dependent on heating
and cooling lockout functions based on the outdoor and supply air temperature. Please see the next
section for more information.