Johnson Controls VMA1930, Installation Manual, Page: 9 / 20

I/O terminal blocks, ratings and requirements
Table 3: I/O terminal blocks, functions, ratings, requirements, and cables
Terminal block label Terminal labels Function, ratings, and requirements
To determine wire size and
maximum cable length
+15 V
15 VDC Power Source for active (3-wire) input
devices connected to the Universal INn terminals.
Provides 35 mA total current.
Same as (Universal) IN n .
Note: Use 3-wire cable for
devices that source power
from the +15 V terminal.
Analog Input - Voltage Mode (0–10 VDC)
10 VDC maximum input voltage
Internal 75k ohm Pulldown See Guideline A in Table 4.
Analog Input - Resistive Mode (0–600k ohm)
Internal 12 V, 15k ohm pull up
Qualified Sensors: 0–2k potentiometer,
RTD (1k Nickel [Johnson Controls sensor],
1k Platinum, and A99B Silicon Temperature Sensor)
Negative Temperature Coefficient (NTC) Sensor
10K Type L (10K Johnson Controls Type II is
equivalent to Type L) or 2.252K Type II
See Guideline A in Table 4. IN n
Binary Input - Dry Contact Maintained Mode
1 second minimum pulse width
Internal 12 V, 15k ohm pull up See Guideline A in Table 4.
UNIVERSAL
(Inputs)
ICOM n
Universal Input Common for all Universal IN
terminals
Note: All Universal ICOMn terminals are
isolated from all other commons.
Same as (Universal) IN n .
OUT n
Binary Output - 24 VAC Triac (Internal Power)
Sources internal 24 VAC power (24~ HOT)
See Guideline C in Table 4.
BINARY
(Outputs)
OCOM n
Binary Output - 24 VAC Triac (Internal Power)
Connects OCOMn to 24~ COM when activated.
Internal Power Source:
30 VAC maximum voltage to load
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
See Guideline C in Table 4.
VMA1930 VAV Controller Installation Guide 9