Trane VAV-SVX02B-EN manual Calibration, New Cross-over pressure

Reversing Relay

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.

Pressure

Regulator

M

Figure 8–Recalibrating Reversing Relay

Gage

1

M C

3

Bias

Adjustment

Screw

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:

New Cross-over pressure

Chart

Input:	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Output:	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1

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

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

VAV-SVX02B-EN 5