Lawler AVAS Installation & Maintenance Manual

5330 East 25 Street
th
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
AVAS
Audio/Visual Alarm System
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
SP
Set Point
r0 Hysteresis
r1
Lower Value Set Point
r2 Upper Value Set Point
d0
Heating or Cooling
d2 Time for Defrosting
d8 Interval between Defrost
c0
Min. Stop Time
c1 Continuous Cycle Time
c2
On Time of Fault Cycle
c3 Off Time of Fault Cycle
A0
Alarm differential/hysteresis 1° to 20°
A1 Max alarm temp
A2 Min alarm temp
A7
Alarm time valaidation
P0 Temperature Scale
P1
Ambient Probe Adj.
P4 Decimal Point
H0 Factory Settings
H4 Address
H5 Parameter Access Code
H6
Ambient Probe Type
t0
Max Temp on Display
(1)
Installation &
Maintenance Manual
M AVAS A
Range Default
r1 to r2 120°F
1 to 20 2°F
-50 to +150°F -50°
-50 to +302°F 200°F
Ht/Co Co
0 to 59 Min 0 Min
1 to 24 Hrs 1 Hr
0 to 59 Min Load 0 Min
0 to 24 Hrs 0 Hrs
0 to 999 Min 0 Min
0 to 999 Min 0 Min
5° F
1° to 20° 10° F
1° to 20° 90° F
0 to 99 Min 0 Min
Option 0/F°
-10 to +10°F 0°F
Option No
Option 0
0 to 999 0
00 to 99 00
Option PTC
-50 to +302°F 200°F