Toxalert GVU-1D - Manual (Page 3)

SENSOR WIRING
NOTE: Refer to figs. 2 and 3 and tables 1 and 2. Use
shielded cable to interconnect sensing and control
unit if metal conduit is not used, or if conduit also
contains AC wiring.
NOTE: Comply with all local building codes and
ordinances.
1) Measure distance between sensing unit and control
unit and select proper size wire or larger wire from
Table 1.
2) Run wiring between control and sensing unit and
into enclosure through access holes. Connect
wires from terminal blocks in sensing unit to TB2
in control unit per figs. 2 & 3.
TABLE 1
AWG DO NOT EXCEED
#22 Wire 500 Ft. Sensor to Controller
#20 Wire 800 Ft. Sensor to Controller
#18 Wire 1300 Ft. Sensor to Controller
#16 Wire 2000 Ft. Sensor to Controller
TABLE 2
CONTROL UNIT TERMINALS
TB1-ACH (AC Power in- 120 VAC HOT)
TB1-ACN (AC Power in- 120VAC NEU)
TB1-EG (Ground)
TB1-K2(2) (Fan pilot relay contacts)
TB1-K1(2) (Alarm relay contacts)
TB2-1 (Alarm input)
TB2-2 (Sensor power loss)
TB2-3 (+5VDC)
TB2-4 (+5VDC)
TB2-5 (Cable shield*)
TB2-6 (Power loss)
TB2-7 (+12VDC)
TB10 (24VAC or 24VDC+)
TB10 (24VAC or 24VDC-)
Terminal strip TB-2 (figs. 2 & 3) is the control I/O
between the GVU-1 control unit and the sensing unit.
(NOTE: This terminal strip will supply 12VDC
power to the GVU-CO SENSOR ONLY via termi-
nal 7. Power for any other sensor type will be
supplied at terminal strip TB-10).
*Shielding of cable should be connected at only one
end when grounded metallic conduit is not used, or
shared with AC wiring. Connect shielding at terminal
5, TB-2 of control unit. Make sure shielding at sensor
end is taped and isolated from any terminal or metal.
CONTROL UNIT WIRING
WARNING: To prevent fire or shock hazard turn off
control unit and fan power sources before making
connections to control unit. Comply with all local
building codes and ordinances.
1) Connect power to TB-1 as follows:
AC hot to TB1-1 (ACH)
AC neutral to TB1-2 (ACN)
AC ground to TB1-3 (EG)
CAUTION: Relays K1 and K2 are rated for 2.0 amps
resistive load. If a higher rated alarm or pilot control
is required, add a remote relay between the control
relay and load.
2) Connect dry contacts of alarm K1 (TB1-6 and
TB1-7) to alarm device (optional).
3) Connect dry contacts of fan relay K2 (TB1-4 and
TB1-5) to fan pilot control.
4) Set unit power switch S1 to the off position, TST/
OPR switch S2 to OPR and OPR/RST switch to
RST.
5) Turn on control unit AC power source, but do not
apply power to fans at this time.
3. BURN-IN (GVU-CO & GVU-VOC SENSORS
ONLY)
Burn-in allows sensor to stabilize before proceeding
with alarm setting procedure.
1) Be sure fan power is off, power is applied to
control unit and power switch S1 is set to PWRON.
2) Allow system to burn-in for a minimum of 72
hours with power turned on to sensor.
3) When 72 hours have elapsed, proceed with system
check-out.
4. SETTING OF TIMING FUNCTIONS
There are two (2) eight position DIP switches in the
upper right hand corner of the GVU-1 control board,
labeled S4 and S5. These control the systems timing
functions.
Hourly Operations (S4)
S4 and toggle switch S3, in the upper left corner of
the GVU-1 board control the hourly operation of the
K-2 relay. With the number “1” switch of S4 in the
up position, the fan will run one minute each hour;
with the number “2” switch in the up position, the
system will run two minutes every hour; and so on,
up to eight minutes. The switches are not additive
and if more than one switch on S4 is in the up posi-
tion, the system operates the lowest number of
minutes of the S4 switches in the up position. With
S3 in RST (reset) position, the hourly function is