1: Single Interlock Zone Releasing; 2: Double Interlock Zone Releasing - Honeywell 6820 Manual

System Operation
.
NOTE: For releasing operations, a manual releasing disconnect switch is required per UL 864. Refer to the MRD-1H Series Document for
installation instructions.
9.6.1 Single Interlock Zone Releasing
A single interlock zone utilizes a minimum of two addressable detectors and a designated manual release switch.
CAUTION: ADDRESSABLE DETECTORS/MANUAL RELEASE SWITCH
!
ONLY ADDRESSABLE DETECTORS CAN BE USED. NO CONVENTIONAL DETECTORS CAN BE USED. EACH SINGLE
INTERLOCK ZONE INPUT REQUIRES AT LEAST ONE MANUAL RELEASE SWITCH.
Conditions Required for a Pre-Alert Output Activation
If any single addressable detector is activated, the "Pre-Alert" output will activate. This alerts the user that the initial stages required for a
release condition are present. (Refer to Table 9.5).
Conditions Required for a General Alarm and Release Output Activation
If two or more addressable detectors, or a manual release switch activate, the "Alarm" and "Release" outputs will activate and the "Pre-
Alarm" output will deactivate. (Refer to Table 9.5 below.)
Inputs
1st Addressable Detector
2nd Addressable Detector
Manual Release Station
CAUTION: DETECTOR SPACING
!
DETECTORS MUST BE INSTALLED AT 0.7 TIMES THE LINEAR SPACING AS DESCRIBED IN NFPA 72
9.6.2 Double Interlock Zone Releasing
A Double Interlock Zone uses a minimum of two addressable detectors, a designated manual release switch, and an interlock switch input.
An interlock switch is typically a dry-contact pressure switch and will be referred to as an interlock/pressure switch in this document. Only
addressable detectors can be used. No conventional detectors can be used.
Conditions Required for a Pre-Alert Output Activation
If any single addressable detector is activated, the "Pre-Alert" output will activate. This alerts the user that the initial stages required for a
release condition are present. (Refer to Table 9.6.)
Conditions Required for a General Alarm Output Activation
If two addressable detectors, a manual release switch is activated, or an interlock switch is active, the "Pre-Alert" and "General Alarm" out-
puts will activate.
124
Either NAC circuit
can be used.
UL-listed solenoid
supervisory module-
must be located at the
solenoid.
black
releasing solenoid
Use 1 solenoid per
Figure 9.8 Wiring Configuration for Solenoid
X
X
Normal Pre-Alert
Table 9.5 Single Interlock Zone Operation
+ –
red
circuit.
Output Results
X
X
X
Release and General Alarm
6820/EVS Manual — P/N LS10144-001SK-E:E 4/6/2022
Releasing Operations
X X
X X
X X X