12
Sensor Verification Test
Proceed as follows:
With LAT sensor connected to PC Board:
1. Insert test thermometer into duct as near to LAT sensor as possible.
2. Measure DC voltage across two LAT terminals.
3. Voltage reading should indicate the same temperature as test thermometer reading shown
on chart (Fig. 11a), plus or minus 3° F.
4. If voltage reading is different than chart voltage, proceed to the following sensor check.
With LAT sensor disconnected from PC Board:
1. Measure resistance across sensor at 100k to 200k Ohm scale. Ohm reading should
indicate the same temperature as test thermometer chart below. (Fig. 11a)
2. If Ohm reading does not match chart (+ or - 10 %), replace the sensor.
3. If Ohm reading matches the chart, check for 5 volts DC at LAT terminals.
4. If voltage is not 5 Volt DC, replace PC Board.
LAT - TEMPERATURE / OHMS / DC VOLTAGE RELATIONSHIP CHART
SMART SLAVE ZONE (SSZ™) Thermostat
Any number of Smart Slave Zones may be added to all Arzel panels. The Smart Slave Zone thermostat
does not control the HVAC equipment. It will only open its zone dampers if the air temperature in the
duct is compatible with the thermostat call. Smart Slave Zone operation is indicated by the LED on its
PC board. If the LED is lit, the damper is in the open position. Do not use a Heat Pump thermostat for
the Smart Slave Zones.
SMART SLAVE ZONE (SSZ™) WIRING AND TUBE CONNECTIONS
(Fig.12a)
• Smart Slave Zone thermostats do not need a heating-cooling sub-base to operate but could be
used to lock out cooling calls in the heating season or heating calls in the cooling season.
• Connect “R”, “W” and “Y” thermostat wires to “R”, “W” and “Y” terminals on the Smart Slave
Zone PC board.
• Connect Smart Slave Zone damper tubing to the Smart Slave Zone solenoid bulkhead fitting on
top of the panel.
• Do not use a heat pump thermostat for any Smart Slave Zone, in Heat Pump applications.
(Fig. 11a)
Temp
Ohms (k)
DC Volts
Temp
Ohms (k)
DC Volts
40
26.1
3.82
76
10.2
2.85
42
24.7
3.77
80
9.3
2.72
44
23.4
3.72
90
7.3
2.42
46
22.1
3.69
100
5.8
2.14
48
20.9
3.63
110
4.7
1.88
50
19.9
3.57
120
3.8
1.63
52
18.8
3.52
130
3.0
1.41
54
17.9
3.46
140
2.5
1.22
56
16.9
3.40
150
2.0
1.05
58
16.1
3.35
160
1.7
0.90
61
14.5
3.28
170
1.4
0.77
70
11.8
2.98
180
1.2
0.66
Rev. 5/01/01
U.S. and Foreign Patents & patents pending. © copyright 2004 by Arzel Zoning Technology, Inc.
