Trane VAV-SVX02B-EN manual Calibration Procedures, Normally-OpenValve Normally-Open Valve

Calibration

Procedures

Calibration Procedure (Steps 1–4 apply to all thermostat models)

1.Be sure the PVR is installed correctly and that all connections are hooked up to the proper ports. See Figure 9 for unit application.

2.Remove the caps on the tees which are connected to the lines to the flow sensor. Connect a 0–2" magnehelic gage to monitor flow sensor delta P. The higher-pressure port is further upstream on the air valve inlet.

3.Remove the thermostat line and connect a hand pump with a 0–20 psi gage to port “T”.

4.Tee a 0–20 psi gage in the line from port “B” on the volume regulator to the air valve actuator.

Normally-OpenValve

Normally-Open Valve

Direct-Acting Thermostat (See Figure 13 for proper connections)

5.Set port “T” at 0 psi.

6.Monitor the delta P and adjust the LO-stat mini- mum) adjustment to desired minimum.

7.Set port “T” input at 16 psi or greater with the hand pump.

8.Monitor the delta P and adjust the HI-stat (maxi- mum) adjustment to desired maximum flow. If the actuator pressure is less than 3 psi, the air valve is wide open and duct pressure must increase to increase flow.

9.Set port “T” at 0 psi.

10.Monitor the minimum flow delta P. If it is not correct, adjust the LO-stat adjustment knob.

Reverse-Acting Thermostat (See Figure 13 for proper connections):

5.Set port “T” at 0 psi.

6.Monitor the delta P and adjust the LO-stat delta P (maximum) adjustment to desired maximum. If the actuator pressure is less than 3 psi, the air valve is wide open and duct pressure must increase to increase flow.

7.Set prot “T” to 16 psi

or greater with the hand pump.

8.Monitor the delta P and adjust the HI-stat (mini- mum) adjustment to desired minimum flow.

9.Set port “T” at 0 psi.

10.Monitor the maximum flow delta P. If it is not correct, adjust the LO-stat adjustment knob.

Direct-Acting Thermostat (See Figure 14 for proper connections):

5.Set port “T” at 0 psi.

6.Monitor the delta P and adjust the LO-stat (mini- mum) adjustment to desired minimum.

7.Set port “T” input at

16 psi or greater with the hand pump.

8.Monitor the delta P and adjust the HI-stat (maximum) adjustment to desired maximum flow. If the actuator pressure is greater than 13 psi, the air valve is wide open and duct pressure must increase to increase flow.

9.Set port “T” at 0 psi.

10.Monitor the minimum flow delta P. If it is not correct, adjust the LO-stat adjustment knob.

Reverse-Acting Thermostat (See Figure 14 for proper connections):

5.Set port “T” at 0 psi.

6.Monitor the delta P and adjust the LO-stat delta P (maximum) adjustment to desired maximum flow. If the actuator pressure is greater than 13 psi, the air valve is wide open and duct pressure must increase to increase flow.

7.Set prot “T” to 16 psi or greater with the hand pump.

8.Monitor the delta P and adjust the HI-stat (mini- mum) adjustment to desired minimum flow.

9.Set port “T” at 0 psi.

10.Monitor the maximum flow delta P. If it is not correct, adjust the LO-stat adjustment knob.

Figure 13–Connections of Direct/Reverse-Acting	Figure 14–Connections of Direct/Reverse-Acting
Thermostat with Normally-Open Valve	Thermostat with Normally-Closed Valve

0±2© Magnahelic Gage

HI LO

0±2© Magnahelic Gage

HI LO

Normally-Open Unit

LO

Volume	Apply 20 psi
Regulator

Normally-Closed Unit

LO

Volume

Regulator

Apply 20 psi

HI

T

H

HI

H

T

Actuator

Airflow Sensor

B	RESET START
	LO STAT P
NC	HI STAT P	PSI
I C
NO
M	0	10
DAMPER

Connect 0±20 psi Gage

	G
	Connect Hand Pump
	0±2 psi
S	Handpump
20

Actuator

Airflow Sensor

RESET START

B LO STAT P

NO		HI STAT P
I	C	I N R
NC
M
DAMPER

G

S 20

PSI

0 10

Connect 0±20 psi Gage

Connect Hand Pump

0±2 psi

Handpump

8 VAV-SVX02B-EN