Constant-Volume Single-Duct VAV (VCV 3011)
Constant-Volume Single- Duct VAV (VCV 3011)
This is used when a constant volume of air is required to supply a zone. A thermostat is still often required to modulate a reheat coil to maintain temperature control.The thermostat is never connected to the “T” port on the volume regulator.The following procedure is used to calibrate this type of unit with a PVR.
1.Be sure there is 0 psi at the “T” port.
2.Set LO thermostat adjustment knob to desired unit cfm.
The unit will now modulate to the calibrated cfm setting. See Figure 18 for typical constant volume
Figure 18–Typical Constant-Volume Single-Duct Piping Diagram
HI
LO
Flow Ring
Actuator
| H L | T |
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B |
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M | Volume |
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Regulator |
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| S |
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S |
| 20 |
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20 |
| (137.9) |
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(137.9) | Tee |
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11 |
| ||
| (75.8) |
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Stage 1 | Airflow | ||
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| 12.5 | Safety Switch |
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| (86.2) |
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| Stage 2 |
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| 14 | P.E. Stage Switch(es) |
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| (96.5) |
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Stage 3
Electric Heater Terminal Box
Trane
An American Standard Company www.trane.com
For more information contact your local district office or
Literature Order Number | |
File Number | |
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Supersedes |
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Stocking Location | La Crosse |
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Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. Only qualified technicians should perform installation and servicing of equipment referred to in this publication.
