I/O terminal blocks, ratings and requirements
Table 5: 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 UI-n terminals.
Provides 35 mA total current.
Same as (Universal)
UI-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 6.
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 6.
UI-n
Binary Input - Dry Contact Maintained Mode
1 second minimum pulse width
Internal 12 V, 15k ohm pull up
See Guideline A in Table 6.
UNIVERSAL
(Inputs)
UI-C or UI-Cn
Universal Input Common
for all Universal IN
terminals
Note:
All Universal UI-C/UI-Cn terminals are
isolated from all other commons.
Same as (Universal)
UI-n
.
Analog Output - Voltage Mode (0–10 VDC)
10 VDC maximum output voltage
10 mA maximum output current
External 1k to 50k ohm load required
See Guideline A in Table 6.
CO-n
Binary Output 24 VAC Triac
Connects CO-n to CO-C/CO-Cn when activated.
External 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
Analog Output Signal Common
: All Configurable
Outputs defined as Analog Outputs share a
common, which is isolated from all other commons
except the Binary Input common.
CONFIGURABLE
(Outputs)
CO-C or CO-Cn
Binary Output Signal Common
: All Configurable
Outputs defined as Binary Outputs are isolated
from all other commons, including other
Configurable Output commons.
Same as (Configurable)
CO-n
.
BINARY
(Outputs)
BO-n
Binary Output - 24 VAC Triac (Internal Power)
Sources internal 24 VAC power (24~ HOT)
M4-CV Series VAV Box Controllers Installation Guide
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