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VAV-SVX02B-EN 11
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.
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.
Direct-Acting Thermostat
5. Set port “T” at 0 psi.
6. Monitor the delta P and
adjust the LO-stat
(minimum) 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
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
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
(minimum) 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.
Normally-Open Valve
Direct-Acting Thermostat
5. Set port “T” at 0 psi.
6. Monitor the delta P and
adjust the LO-stat
(minimum) 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.
Normally-Closed
Reverse-Acting Thermostat
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
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
(minimum) 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.