Accessory List

Useful Formulas
382
© Copyright 2006 TAC. All Rights Reserved. F-27382-1
TAC SYSTEM 8000
Action
Balco between 6.2 and ISA = Direct Action
1K resistor between ISA and COM
1K resistor between ISA and 6.2 = Reverse Action
Balco between ISA and COM
Reset Truth Table
Ratio (Reset applications only)
A (T1 max - min) = __________________
B (T2 max - min) = __________________
If You Need the Reset To Be: Make the “B” Bridge
Reverse
The same as the “A” Bridge
Direct
Different than the “A” Bridge
Useful
Formula
s
C.T.R.
S.T.R. 3 VDC×
volt span of system
---------------------------------------------------=
S.T.R.
C.T.R. volt span of system×
3VDC
------------------------------------------------------------------------------=
Typical
S.T.R.
Application
2°F
VAV.
3°F
Reheat.
4°F
Dual duct or multizone.
8°F
Hot water temperature from mixing valve.
10°F
Hot water temperature from steam to water converter.
10°F
Mixed air temperature.
5°F
Chilled water.
5°F
DX cooling.
8°F
Hot water coil.
B
A
--- Ratio=