Johnson Controls VMA1400 Series - Page 33

Mounting and Wiring VMA1400 Series Controllers Technical Bulletin
33
Primary
Manual
Reset
AFS
Earth ground is required
by NEC if primary is
greater than 150 VAC.
1
2
XFR
Stepper
COM
Water
Valve
1
2
4
3
In
N2
VMA
+15 V
+5 V
Triacs
COM
COM
AO
15
23
14
OPTO
24 VAC
BCOM
µ
P
AO
CablePRO or
CVTPRO
Laptop
R
R
R
Reheat
BO-3
Reheat
BO-2
Fan
Relay
BO-1
vmadia2
24 VAC
4
6
8
BI18
AI26
5
= Optical or
Magnetic
Isolation
3
0.01 F
µ
High
Temperature
µ
P = Microprocessor
µ
F = Microfarad
Figure 19: VMA Internal Schematic Diagram