UVM summing - Johnson Controls - LIT-12014272 - Valve - Venturi Valve

Venturi Air Valve with UVM1000 Installation Guide

Brand
Johnson Controls
Product name
Venturi Valve
Document type
Installation Guide
Document number
LIT-12014272
Revision date
2023-03-10
Language
English

UVM summing is a standalone pseudo modbus network created by wiring Venturi air valves in a closed series circuit connected in a continuous row and polling them individually for their respective CFMs. The valves are summed together in the parent valve for a single CFM total output. This facilitates summing of up to 16 valves together that only require one set of I/Os on the room level controller. Wire all the Venturi air valves together using an RS485 twisted pair shielded wire. Ensure the white wire is always positive (+).

Based on the specific application needs, the wiring requirements are unique to each project but follow the same logic across all systems:

  • If there are enough I/Os on the room level controller, connect each Venturi air valve directly to the room level controller. This ensures the building automation system sees the individual CFM feedback signals.
  • If there are not enough I/Os on the room level controller, and an I/O expansion module is not an option, you can use the UVM summing feature to sum the flow of multiple Venturi air valves. For example, general supply air, general exhaust air, and fume hood exhaust air. This consolidates the need for additional I/Os on the room level controller.
  • If each individual air valve needs a signal from the CFM feedback position, you cannot use the UVM summing feature to meet application specifications. Wire each air valve directly into the room level controller.
Note: Regardless of summing, if the room has more than one general supply air valve it is best practice to connect all valves in series using an RS485 twisted pair wire to create a standalone UVM network. This enables ease of access to all the air valves from the single parent valve. If the hardware addresses are set correctly using the dip switches, the need to connect the UVM-CABLE to each valve individually is eliminated.
Figure 1. Utilizing the UVM controller UVMNet to sum CFM values
Figure 2. UVM summing wiring diagram
Call out Child valve Hardware address Software address
A 1 0 16
B 2 1 17
C 3 2 18
D 4 3 19
E 5 4 20
F 6 5 21
G 7 6 22
H 8 7 23
I 9 8 24
J 10 9 25
K 11 10 26
L 12 11 27
M 13 12 28
N 14 13 29
O 15 14 30
Table 1. DIP switch settings
Switch number Parent valve Hardware address
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
1 On Off On Off On Off On Off On Off On Off On Off On Off
2 On Off Off On On Off Off On On Off Off On On Off Off On
3 On Off Off Off Off On On On On Off Off Off Off On On On
4 On Off Off Off Off Off Off Off Off On On On On On On On
5 Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off
6 On Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off
7 On Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off
8 Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off Off