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Calibration
By using the "bias" adjustment on the
relay, the factory-set 8.0–9.0 "cross-
over" can be changed. To recalibrate,
the relay should be connected as
illustrated in Figure 8.
M
If the new desired "cross-over"
pressure is 11.0 psi, this must be applied
to port #3 by adjusting the pressure
regulator. The "bias" adjustment is then
turned until 11.0 psi is obtained on the
output gage. Turning the "bias" adjust-
ment "CW" increases the output;
"CCW" decreases it.
This 11.0 psi "cross-over" would yield
the following operational chart:
Chart
Input:
1
2
3
Output:
20
19
18
Specifications
Maximum Pressure:
30 psig
Connections:
3/16" (4.& mm) nipples for ¼" (6.4 mm) OD
polyethylene tubing
Air Consumption:
0.5 SCFH (.236 L/M) @ 20 psig
Material:
ABS
Weight:
3 ½ oz
VAV-SVX02B-EN
Reversing Relay
Figure 8–Recalibrating Reversing Relay
Pressure
Regulator
4
5
6
7
8
17
16
15
14
13
Ambient Limits:
+40°F/+120°F operating (+4°C/+49°C)
Mounting:
In-line via air connections
Factory Settings:
9 psig in./9 psig out and 8 psig in./8 psig
out
Bias Adjustment:
+/-15 psi
Gage
M
9
10
11
12
13
12
11
10
9
8
1
C
Adjustment
3
New Cross-over pressure
14
15
16
17
18
7
6
5
4
3
Bias
Screw
19
20
2
1
5
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