Trane VAV-SVX02B-EN Constant-Volume Dual-Duct Calibration, ConstantVolume Dual-Duct Calibration

Constant-Volume Dual-Duct Calibration (3011)

ConstantVolume Dual-Duct Calibration (3011)

This calibration procedure is used when a constant volume of air must be maintained through a unit. On a dual- duct unit, a constant-volume discharge sensor is used to measure the air leaving the unit.The PVR controlling to a constant-volume of air leaving the unit uses the discharge sensor to maintain the specified cfm.

This PVR does not require a thermostat connected to the PVR.

The following procedure must be used when calibrating a constant-volume dual-duct unit. See Figure 15 for a typical piping diagram.

1.Set t-stat to full heat.

2.Set LO thermostat (maximum) to the desired maximum flow on the heating deck.

3.Set t-stat to full cool.

4.Set HI thermostat (minimum) to the desired minimum flow on the heating deck.

5.Set LO thermostat adjustment knob on cooling deck (CV deck) to desired constant-volume.

6.Exercise the system to check flows for proper operation.

Figure 15–Typical Constant-Volume

Dual-Duct Piping Diagram

				Constant-Volume
				Flow Ring
Outlet		LO
		HI
			Cooling				H	L	T
	Heating
	a ve		Valve			Actuator	B		Volume
	Normally-		Normally-
									Regulator
	Open			Open
	LO						M
	HI					S
						20
						(137.9)
						Two-Pipe
		H		T		Remote-Mounted
			L		Restrictor	T-Stat
	Actuator	B			Tee	(Direct-Acting)
				Volume
				Regulator		S
		M
						20
						(137.9)
		S		G
		20
		(137.9)
14									VAV-SVX02B-EN