Lawler AVAS, Installation & Maintenance Manual

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Installation &
Maintenance Manual
M AVAS A
(1)
AVAS
Audio/Visual Alarm System
5330 East 25
th
Street
Indianapolis, Indiana 46218
Phone (317) 261-1212
Fax (317) 261-1208
Description
The Audio/Visual Alarm System is designed to give
a visual and audible warning in cases where water
temperature exceeds a pre-programmed setpoint. In
addition, the alarm system can control an optional
solenoid valve, shutting down the flow of water if
necessary. The probe temperature is displayed on
a bright 3-digit LED display, and access to the unit
programming is done thru the password protected
keypad on the front face. A keylock switch is pro-
vided to override the audible alarm.
Specifications
Probe Range:
-58 to +302°F
Input:
Thermistor (1000Ω @ 25°C)
Accuracy:
±1°
Resolution:
±1 Digit
Supply Voltage:
120 VAC
Ambient Temperature:
32 to +131°F
Storage Temperature:
-4 to + 176°F
Display:
3-digit, Red, ½
″
High
Installation
The Alarm System comes with a standard 120 VAC
pigtail. The controller uses a SPDT relay powering the
horn, and light, as well as an optional normally closed
solenoid valve. Please see Lawler Manufacturing,
Inc. about approved solenoid valves to use with the
alarm system so as not to overload the controller.
Observe proper polarity when connecting to the ter-
minal block on the back panel of the enclosure. The
wiring diagram can be found on page 3.
Upon powering the unit up the solenoid valve will
open allowing the flow of water. If the set point is
exceeded, the valve will close, and the audible and
visual alarms will come on. The audible alarm can
be bypassed with the keylock switch. The unit will
return to normal when the temperature goes below
the sum of the set point and the high alarm minus the
hysteresis.
Parameters
Code Description Range Default
SP Set Point r1 to r2 120°F
r0
Hysteresis 1 to 20 2°F
r1 Lower Value Set Point -50 to +150°F -50°
r2
Upper Value Set Point -50 to +302°F 200°F
d0 Heating or Cooling Ht/Co Co
d2
Time for Defrosting 0 to 59 Min 0 Min
d8 Interval between Defrost 1 to 24 Hrs 1 Hr
c0
Min. Stop Time 0 to 59 Min Load 0 Min
c1 Continuous Cycle Time 0 to 24 Hrs 0 Hrs
c2
On Time of Fault Cycle 0 to 999 Min 0 Min
c3 Off Time of Fault Cycle 0 to 999 Min 0 Min
A0
Alarm differential/hysteresis 1° to 20° 5° F
A1 Max alarm temp 1° to 20° 10° F
A2
Min alarm temp 1° to 20° 90° F
A7 Alarm time valaidation 0 to 99 Min 0 Min
P0
Temperature Scale Option 0/F°
P1 Ambient Probe Adj. -10 to +10°F 0°F
P4
Decimal Point Option No
H0 Factory Settings Option 0
H4
Address 0 to 999 0
H5 Parameter Access Code 00 to 99 00
H6
Ambient Probe Type Option PTC
t0 Max Temp on Display -50 to +302°F 200°F