Table 2-3 Control Relay Contact Information; Table 2-4 Alarm Relay Contact Information - Honeywell DC33XB User Manual

Control Relays
ATTENTION
Control relays operate in the standard control mode: i.e., energized when output state is
on.
Unit Power
Off
On
Alarm Relays
ATTENTION
Alarms relays are designed to operate in a failsafe mode; i.e., de-energized during alarm
state. This results in alarm actuation when power is OFF or when initially applied, until the
unit completes self-diagnostics. If the unit loses power, the alarms will function.
Unit
Power
Off
On
12/00

Table 2-3 Control Relay Contact Information

Control Relay
Wiring
N.O.
N.C.
N.O.
N.C.

Table 2-4 Alarm Relay Contact Information

Variable
Alarm
NOT in Alarm State
Relay
Relay
Wiring
Contact
N.O. Open
N.C. Closed
N.O. Closed
N.C. Open
UDC3300 Basic Model: DC33XB User Manual
Control Relay #1 or #2 Output
Contact Indicator Status
Open
Closed
Open
Closed
Closed
Open
Variable
in Alarm State
Relay
Indicators
Contact
Open
Off
Closed
Open
Off
Closed
Installation
Off
Off
On
Off
On
Indicators
Off
On
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