F. ZDM TROUBLE SHOOTING
16.2 Verification Zone Detector Module (VZM)
The Verification Zone Module (VZM) may be used to replace the ZDM in applications where verification
of alarm is required. Each VZM has an individual zone maintenance switch as well as a red “ZONE ALARM”
LED and a yellow “ZONE TROUBLE” LED; placement of these is the same as on the ZDM (see Fig. 14).
The VZM will accept FCI approved, U.L. Listed, and Multiple Listed two-wire smoke detectors, four-wire smoke
detectors, and normally open contact initiating devices wired either Class A, Style D or Class B, Style B at
Terminals 37 through 40 of the BMFC or ZMC. Each zone is capable of powering a specific number of FCI
approved two-wire detectors.
The VZM differentiates between two-wire smoke detectors and normally open contact initiating devices,
allowing a verification time cycle with the two-wire smoke detectors. However, for normally open contact
initiating devices and four-wire smoke detectors, the verification time cycle is automatically bypassed.
The Verification Time Cycle has a fixed time out, totaling 124 seconds. It begins with a 20 second presignal-
ing alarm window, initiated by an active FCI approved, U.L. Listed, and Multiple Listed two-wire smoke detector,
(indicated by the flashing yellow trouble LED on the VZM). The presignaling alarm window is followed by a
4 second automatic reset time, (indicated by the constant yellow “TROUBLE” LED), and a 100 second alarm
verification window, (indicated by a flashing yellow LED). The alarm verification window holds the circuit in the
presignaling alarm state, waiting for the first alarm to be verified. If a subsequent alarm comes in from a smoke
detector in the circuit, the VZM will initiate a System Alarm, (indicated by the red LED). If a subsequent alarm
is not received within 100 seconds, the VZM will return to its normal supervisory condition.
The output parameters of an initiating circuit with a Verification Zone Module are as follows:
Voltage 24 VDC regulated
Max. ripple voltage .672 VAC (RMS)
Standby current .006 amp. (normal standby)
Alarm current .035 amp. max. (alarm)
Power limited
Supervised
“ZONE TROUBLE” “MAINTENANCE” switch Place the “MAINTENANCE” switch
led IS LIT. is in the “OFF” position. in the normal position.
Initiating circuit Check BMFC/ZMC circuit for opens. It should read
between 3,900 and 4,000 ohms. (The reading will be
between 3,300 and 4,050 ohms if a 3.3K EOL resistor
is used)
Remote alarm indicator Press the LAMP TEST switch on the BMFC
defective, field wiring while someone observes the remote indicator.
open or Jumper JRA, If the remote indicator does not light, check the field
JRB cut. wiring. If no remote indicator is used, be sure
Jumpers JRA, JRB are not removed, or that BMFC/ZMC
Terminals 36 and 41 are connected.
Zone alarm LED defective Press the “LAMP TEST” Switch; If the red LED
does not light, replace the ZDM.
K1 K2
ZONE ALARM LED (RED)
ZONE TROUBLE LED (YELLOW)
ZONE
MAINTENANCE
SWITCH
VZM
J2
J1
CR6
LATCH
F1
MICROFUSE
4300-0018
J2
J1
TEST
MINI-JUMPER
2110-0014
Figure 15
Alarm in 20 second 4 sec. 100 sec.
(From smoke Presignal- Reset alarm
detector) alarm window Verification
window
Normal Normal
Supervisory Supervisory
condition condition
Verification Time
PROBLEM CAUSE ACTION TO BE TAKEN
Page 16 of 28 9000-0007
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