Trane VAV SVX02B EN Thermostat User Manual

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Installation/

Operation

Maintenance

VariTrane^™

Pneumatic Controls

March 2002

VAV-SVX02B-EN

Thermostat

Figure 1–Two-Pipe RemoteThermostat (Reverse-Acting)

Thermostat Selection

and Location

In general, both one- and two-pipe

thermostats have a gain of 2.5 psi per

degree Fahrenheit, unless special

thermostats are used that provide a

different gain. The major difference

between them is that a one-pipe

thermostat is considered a low-

capacity thermostat and a two-pipe

thermostat is considered a high-

capacity thermostat.

Tee

Two-Pipe

Remote-Mounted

T-Stat

(Reverse-Acting)

When selecting between one-pipe and

two-pipe thermostats consider the

following:

Use one-pipe thermostat when:

tubing runs are less than 50 feet from

thermostat to controller.

a single thermostat will control no

more than three controllers.

slower response is desired from the

thermostat.

Figure 2–Typical One-PipeThermostat (Reverse-Acting)

Use two-pipe thermostat when:

tubing runs exceed 50 feet from

thermostat to controller.

a single thermostat will control four or

more controllers.

high capacity air is required due to

restrictions in the air line.

Restrictor

One-Pipe

Remote-Mounted

T-Stat

Tee

(Reverse-Acting)

Thermostat Piping

Restricted Leg

The two-pipe thermostat (Figure 1)

includes a restrictor (internally). Attach

supply air line and output pressure

(branch) line to the thermostat.

The one-pipe thermostat (Figure 2)

requires an external restrictor tee.

Connect main air supply to restricted

leg of restrictor tee. Connect branch line

from restrictor tee to the thermostat.

(137.9)

Fan

P.E.

Switch–1

(N.O.)

9 PSI

(62.06 kPa)

VAV-SVX02B-EN

Thermostat

Specifications

Operation

Figure 4 illustrates the pressure/

temperature characteristics for a

reverse-acting thermostat. As room

temperature increases, the thermostat

output pressure decreases.

TP970 Series PneumaticT-stats

Maximum Safe Air Pressure:

25psi (172 kPa)

Maximum Safe AirTemperature:

150°F (66°C)

Pneumatic thermostats modulate

output air pressure in response to room

air temperature. Pneumatic thermo-

stats fall into two categories: direct-

acting or reverse-acting.This section

describes how thermostat output

pressure responds to changes in room

temperature.

Figure 4–Reverse-Acting

Thermostat Response

Throttling Range:

2–10°F (1–5°C)

Figure 3 graphically illustrates the

relationship between room

Gain:

2.5 psi/°F Adjustable

temperature and output pressure of a

direct-acting thermostat.The graph in

Figure 3 shows that as the room

temperature increases, so does the

output pressure of the thermostat.

Figure 3–Direct-Acting

Thermostat Response

InputTemperature

A thermostat in proper working order

will be able to output a pressure

ranging from approximately .5 psi to

supply air pressure depending on

distance from indicated setpoint.

InputTemperature

VAV-SVX02B-EN

Reversing Relay

Figure 6–Reversing Relay Connections

Installation and Operation

The reversing relay is a proportional,

non-bleeding device for use in pneu-

matic control systems where a propor-

tional signal from a controlling device

must be reversed (see Figure 5).The

most common use of the reversing

relay is to change the action of a

pneumatic thermostat.

Output

Branch

(137.9)

Figure 5–Pneumatic Reversing Relay

Trane Part No. RLY-755

9 PSI In

(62.06 kPa)

Reversing

Relay

9 PSI Out

(62.06 kPa)

Input

Branch

The reversing relay requires three

piping connections: main/supply air,

input signal air, and output branch air

(see Figure 6).The branch line pressure

decreases in direct proportion to an

increase in the input signal pressure

and vice-versa.The input signal is also

amplified, thereby minimizing any

pneumatic line transmission lag

(see Figure 7).

Input pressure to the relay and output

pressure to the PR should always add

up to a constant, which is usually set

between 16 and 25 psi. For example,

with a constant of 18, six-pound input

signal will result in a 12 pound branch

signal. A bias adjustment screw is

provided to retard or advance the out

signal.

Figure 7–Reversing Relay Characteristics

Inc.

Input Pressure Signal

VAV-SVX02B-EN

Reversing Relay

Calibration

Figure 8–Recalibrating Reversing Relay

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.

Gage

Pressure

Regulator

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:

Output:

Specifications

Ambient Limits:

+40°F/+120°F operating (+4°C/+49°C)

Maximum Pressure:

30 psig

Connections:

3/16" (4.& mm) nipples for ¼" (6.4 mm) OD

polyethylene tubing

Mounting:

In-line via air connections

Factory Settings:

9 psig in./9 psig out and 8 psig in./8 psig

out

Air Consumption:

0.5 SCFH (.236 L/M) @ 20 psig

Material:

ABS

Bias Adjustment:

+/-15 psi

Weight:

3 ½ oz

VAV-SVX02B-EN

Model 3011—Pneumatic

Volume Regulator

Installation

Model 3011

1. Attach bracket either vertically or horizontally to the illustration surface. Horizontal

is preferred, vertical is acceptable, any other position is not acceptable (see Figure 9).

The model 3011 PneumaticVolume

Regulator (PVR) is capable of operating

with normally-open or normally-closed

air valves and can operate with either

direct-acting (DA) or reverse-acting

(RA) thermostats.

2. Insert controller into its bracket. Controller may be face up, face down, face left, or

face right.The controller LO and HI stat delta P must be calibrated in the same

position that it is mounted.

Figure 9–Acceptable Installation Positions

Connections

Figure 10 illustrates a typical piping diagram of a normally-open or normally-

closed unit.

Figure 10–Typical Piping Diagram of Normally-Open or Normally-Closed Unit

Normally-Open Unit or

Normally-Closed Unit

One-Pipe

Remote-Installed

T-Stat

Volume

Regulator

Restrictor

Tee

LO STAT ∆P

Actuator

HI STAT∆P

Restricted Leg

RESET SPAN

DAMPER

Airflow Sensor

Selecting Direct- or Reverse-Acting Thermostat (3011)

The model 3011 PVR must be calibrated to operate with either a direct-acting or

reverse-acting thermostat.The control must also be changed when used with a

normally-open or normally-closed air valve.

VAV-SVX02B-EN

Model 3011—Pneumatic

Volume Regulator

Use the following procedure to set-up the PVR:

1. Select damper action (NO or NC). Loosen damper selection switch screw and align to either the NO or NC pointer with damper

pointer and tighten screw.

2. Now determine the type of thermostat that will be used. If a direct-acting thermostat is used, the reset start pressure is typically

8 psi. If a reverse-acting thermostat is used, the reset start pressure is typically 3 psi (see Figure 11).

3. With an accurate gage (0-10 psi) connected to port “G”, regulate the thermostat pressure to port “T” to desired start point pressure.

4. Adjust reset start to indicate 0 psi on port “G” and continuing adjusting to indicate a pressure slightly higher than 0 psi, (i.e., 0.1 psi).

Figure 11–Adjusting Reset Start

Adjust to obtain 0–0.1 psi at port G

Connect Hand Pump

Input desired LO stat

pressure at t-stat port

0–20 psi

RESET START

Handpump

LO STAT ∆P

HI STAT ∆P

DAMPER

psi

RESET SPAN

Connect 0–10 psi Gage

Factory-set at 5 psi

Adjustable (0–10 psi)

NOTE: The arrows on the damper selector must be aligned

exactly or the range of the controller will be limited .0 psi

Adjusting the Reset Span (3011)

The reset span is factory-set at 5 psi.This is the thermostat pressure difference from which the PVR delivers flow from minimum

to maximum setpoints.This range is not normally changed unless a special control scheme is used where control operation

must be changed.

To field adjust a different reset span, follow these steps:

1. Connect an accurate gage to port “G”.

2. Apply 20 psi to port “T”.

3. Adjust reset span to indicate the desired span on port “G” (see Figure 12).

4. LO-stat and HI-stat delta P must now be readjusted (see following calibration procedure)

Figure 12–Adjusting Reset Span

Apply 20 psi

RESET START

LO STAT

HI STAT

RESET SPAN

DAMPER

PSI

Adjust to obtain desired reset span

VAV-SVX02B-EN

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

Reverse-Acting Thermostat

(See Figure 13 for proper

connections):

Reverse-Acting Thermostat

(See Figure 14 for proper

connections):

Direct-Acting Thermostat

(See Figure 13 for proper

connections)

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 delta P

(maximum) adjustment to

desired maximum. If the

actuator pressure is less

than 3 psi, the air valve is

wide open and duct

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

6. Monitor the delta P and

adjust the LO-stat mini-

mum) adjustment to

desired minimum.

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.

7. Set port “T” input at

16 psi or greater with the

hand pump.

pressure must increase to

increase flow.

8. Monitor the delta P and

adjust the HI-stat (maxi-

mum) adjustment to

8. Monitor the delta P and

adjust the HI-stat

increase to increase flow.

7. Set prot “T” to 16 psi

or greater with the

hand pump.

(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.

or greater with the

hand pump.

desired maximum flow. If

the actuator pressure is

less than 3 psi, the air

valve is wide open and

duct pressure must

8. Monitor the delta P and

adjust the HI-stat (mini-

mum) adjustment to

8. Monitor the delta P and

adjust the HI-stat (mini-

mum) adjustment to

desired minimum flow.

increase to increase flow.

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.

10. Monitor the minimum

flow delta P. If it is not

correct, adjust the LO-stat

adjustment knob.

10.Monitor the minimum

flow delta P. If it is not

correct, adjust the LO-stat

adjustment knob.

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

Thermostat with Normally-Open Valve

Figure 14–Connections of Direct/Reverse-Acting

Thermostat with Normally-Closed Valve

0–2' Magnahelic Gage

HI LO

0–2' Magnahelic Gage

HI LO

Normally-Closed Unit

Normally-Open Unit

Apply 20 psi

Volume

Regulator

Apply 20 psi

Volume

Regulator

RESET START

LO STAT

RESET START

LO STAT

Actuator

HI STAT

PSI

DAMPER

Connect 0–20 psi Gage

Airflow Sensor

Connect Hand Pump

0–2 psi

Handpump

Connect Hand Pump

0–2 psi

Handpump

VAV-SVX02B-EN

Specifications (3011)

Differential Pressure Range:

0 to 1.0 in. wg

Minimum Setpoint Range:

0 to 1.0" H₂O

Normal Supply Air Pressure:

20.0 psi

Reset Span Range:

0–10 psi

Minimum Supply air Pressure:

15.0 psi

Maximum SafeThermostat Input:

30 psi (closed chamber)

Maximum Supply Air Pressure:

30.0 psi

OperatingTemperature:

+40/+120°F

Maximum Setpoint Range:

minimum to 1.0 in. wg

Average Supply Air Consumption:

28.8 scim at 20 psi

StorageTemperature:

-40/+140°F

Operating Static Range:

0.25–6.0 in. wg

Thermostat Pressure Input Range:

Adjustable 0–10 psi band from 0–20 psi

Main,Thermostat, Actuator and Static

Pick-up Connections:

.250 O.D.

Reset Start Point Range:

0–10 psi

VAV-SVX02B-EN

Model 3501—Pneumatic

Volume Regulator

Installation

Adjusting the Reset Span (3501)

Model 3501

1. Attach bracket either vertically or

horizontally to the installation surface.

Horizontal is preferred, vertical is

acceptable, any other position is

not acceptable.

The reset span is factory-set at 5 psi.

This is the thermostat pressure differ-

ence from which the PVR delivers

flow from minimum to maximum

setpoints.This range is not normally

changed unless a special control

scheme is used where control

The model 3501 PneumaticVolume

Regulator (PVR) is capable of operating

with normally-open or normally-closed

air valves and can operate with either

direct-acting (DA) or reverse-acting

(RA) thermostats.

2. Insert controller into its bracket.

Controller may be face up, face down,

face left, or face right.The controller

LO and HI stat delta P must be

calibrated in the same position that it

is installed.

operation must be changed.

To field adjust a different reset span,

follow these steps:

1. Connect an accurate gage to port “G”.

Selecting Direct- or Reverse-Acting

Thermostat (3501)

2. Apply 20 psi to port “T”.

3. Adjust reset span to indicate the

desired span on port “G”.

The model 3501 PVR must be calibrated

to operate with either a direct-acting or

reverse-acting thermostat.The control

must also be changed when used with

a normally-open or normally-closed

air valve.

4. LO-stat and HI-stat delta P must now

be readjusted (see following

calibration procedure).

Use the following procedure to set-up

the PVR:

1. Select damper action (NO or NC).

Loosen damper selection switch

screw and align to either the NO or

NC pointer with damper pointer and

tighten screw.

2. Now determine the type of thermostat

that will be used. If a direct-acting

thermostat is used, the reset start

pressure is typically 8 psi. If a reverse-

acting thermostat is used, the reset

start pressure is typically 3 psi.

3. With an accurate gage (0–30 psi)

connected to port “G”, regulate the

thermostat pressure to port “T” to

10.5 psi.

4. Adjust reset start to indicate 2.5 psi on

port “G”

VAV-SVX02B-EN

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.

Normally-Open Valve

Normally-Closed

Direct-Acting Thermostat

5. Set port “T” at 0 psi.

Reverse-Acting Thermostat

5. Set port “T” at 0 psi.

Direct-Acting Thermostat

5. Set port “T” at 0 psi.

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

6. Monitor the delta P and

adjust the LO-stat

6. Monitor the delta P and

adjust the LO-stat delta P

(maximum) adjustment to

desired maximum. If the

actuator pressure is

6. Monitor the delta P and

adjust the LO-stat

(minimum) adjustment to

desired minimum.

(minimum) adjustment

to desired minimum.

7. Set port “T” input at

16 psi or greater with

the hand pump.

7. Set port “T” input at

16 psi or greater with

the hand pump.

greater than 13 psi, the air

valve is wide open and

duct pressure must

pressure must increase

to increase flow.

8. Monitor the delta P and

adjust the HI-stat

8. Monitor the delta P and

adjust the HI-stat

increase to increase flow.

7. Set prot “T” to 16 psi

or greater with the

hand pump.

7. Set prot “T” to 16 psi

or greater with the

hand pump.

(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.

(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

8. Monitor the delta P and

adjust the HI-stat

8. Monitor the delta P and

adjust the HI-stat

(minimum) adjustment

to desired minimum flow.

(minimum) adjustment to

desired minimum flow.

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.

10. Monitor the maximum

flow delta P. If it is not

correct, adjust the LO-stat

adjustment knob.

10. Monitor the minimum

flow delta P. If it is not

correct, adjust the LO-stat

adjustment knob.

10.Monitor the maximum

flow delta P. If it is not

correct, adjust the LO-stat

adjustment knob.

VAV-SVX02B-EN

Specifications (3501)

Differential Pressure Range:

0 to 1.0 in. wg

Minimum Setpoint Range:

0 to 1.0" H₂O

Output Sensitivity:

5 psi/.02

Average Supply Air Consumption:

43.2 scim at 20 psi

Reset Start Point Range:

0–10 psi

Maximum Setpoint Range:

minimum to 1.0 in. wg

Reset Span Range:

0–7 psi

Maximum Setpoint Range:

6.0 in. wg

OperatingTemperature:

+40/+120°F

Normal Supply Air Pressure:

20.0 psi

StorageTemperature:

-40/+140°F

Minimum Supply air Pressure:

15.0 psi

Maximum Supply Air Pressure:

30.0 psi

VAV-SVX02B-EN

MCP-3631—Rotary

Pneumatic Damper Actuator

Installation Method:

Specifications:

Effective Area:

8 sq in. (52 sq cm)

Normal Rotation:

100 deg

MCP-3631—Rotary

Pneumatic Damper Actuator

Description:

Rotary actuators mounts to a standard

½" diameter shaft by a locking collar

and bushing.

Slide collar onto shaft. Slide actuator

onto shaft noting directional rotation.

Slide bushing onto shaft into actuator,

aligns actuator with damper, lock

collar and bushing set screws, and

install bracket.

Supply Pressure:

0 to 20 psig (138 kPa) operating

30 psig (207 kPa) max

Spring Ranges:

Retracted/extendedTorque

(Based on 0 & 20 psi applied)

Models:

Maintenance:

No routine maintenance is required.

MCP-3631-5000 8–13 psi range

(55–90 kPa) Normally-Closed operation

MCP-3631-8000 3–8 psi range

(21–55 kPa) Normally-Open operation

8–13 psi (55–90 kPa);

68/59 in. lbs (8/7 Nm) @ 90 deg

3–8 psi (21–55 kPa);

25/102 in. lbs (3/12 Nm) @ 90 deg

Supply Connection:

3/16" (5 mm) nipple for ¼" (6 mm)

OD polyethylene tubing

Material:

Body

Glass-filled nylon

Diaphragm Neoprene

Weight:

1.5 lbs (0.68 kg)

Ambient Limits:

Operating -20°F–120°F (-29°C–49°C)

Shipping

-40°F–140°F (-40°C–60°C)

VAV-SVX02B-EN

Constant-Volume Dual-Duct

Calibration (3011)

This PVR does not require a thermostat

connected to the PVR.

3. Set t-stat to full cool.

ConstantVolume Dual-Duct

Calibration (3011)

4. Set HI thermostat (minimum) to

the desired minimum flow on the

heating deck.

The following procedure must be used

when calibrating a constant-volume

dual-duct unit. See Figure 15 for a

typical piping diagram.

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.

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.

1. Set t-stat to full heat.

2. Set LO thermostat (maximum) to the

desired maximum flow on the

heating deck.

Figure 15–Typical Constant-Volume

Dual-Duct Piping Diagram

Constant-Volume

Flow Ring

Outlet

Cooling

Valve

Heating

Valve

Actuator

Volume

Regulator

Normally-

Open

Normally-

Open

(137.9)

Two-Pipe

Remote-Mounted

T-Stat

(Direct-Acting)

Restrictor

Tee

Actuator

Volume

Regulator

(137.9)

VAV-SVX02B-EN

Variable Air Volume Dual-Duct

Calibration (3011)

Figure 16–Typical VAV Dual-Duct Piping Diagram

Variable-Air-Volume Dual-

Duct Calibration (3011)

Figure 16 is a typical piping diagram of

aVAV dual-duct unit.The unit has a

thermostat piped to both pneumatic

volume regulators (PVR) which will

operate the heating deck from a

thermostat signal of 3–8 psi.The cooling

deck will operate from a thermostat

signal of 8–13 psi.With normal

calibration of the PVR, the unit will have

both the heating and cooling deck at

minimum with a thermostat signal of

8 psi.

Outlet

Heating

Valve

Cooling

Valve

Actuator

Volume

Regulator

Normally-

Open

Normally-

Open

(137.9)

Two-Pipe

Remote-Mounted

T-Stat

(Direct-Acting)

Restrictor

Tee

In order to have a unit minimum cfm

and still have 0 cfm minimums on both

the heating and cooling deck, special

calibration is required.The PVR has a

“reset start” adjustment knob, which

allows the unit to be calibrated to a

minimum cfm.This is achieved by

crossing over the thermostat ranges.

Figure 17 illustrates this concept.

Actuator

Volume

Regulator

(137.9)

Figure 17–Example

Thermostat Range: 3–8 psi

HeatingValve = 5 psi range

Thermostat Range: 8–13 psi

CoolingValve = 5 psi range

Unit Minimum 400 cfm

Approximately 1000 cfm divided by 5 psi =

200 cfm/1b*

N.O. HeatingValve

Min 0 cfm

Max 1000 cfm

N.O. CoolingValve

Min 0 cfm

Max 1000 cfm

*Due to the relationship between velocity

pressure and cfm; for both the cooling and

heating PVR, a linear relationship between

cfm and psi does not exist.

To obtain a unit minimum cfm of 400 cfm, the

heating deck volume regulator must have its

thermostat range changed from 3–8 psi to

4–9 psi.This is adjusted by changing the “reset

start” point from 3 psi to approximately 4 psi.

Max

Unit Min

Valve Min

The cooling deck volume regulator must have its

thermostat range changed from 8–13 psi to

7–12 psi. This is adjusted by changing the “reset

start” point from 8 psi to approximately 7 psi.

By overlapping the thermostat spring ranges, we

were able to have 0 cfm minimum settings on

both the heat and cool deck and still maintain the

required unit minimum cfm of 400 cfm.

The calibration of the PVR is the same as the

normal calibration procedures previously

described in this manual.

VAV-SVX02B-EN

Constant-Volume

Single-Duct VAV (VCV 3011)

1. Be sure there is 0 psi at the “T” port.

2. Set LO thermostat adjustment knob to

desired unit cfm.

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.

The unit will now modulate to the

calibrated cfm setting. See Figure 18 for

typical constant volume single-duct

piping diagram.

Figure 18–Typical Constant-Volume Single-Duct Piping Diagram

Flow Ring

Actuator

Volume

Regulator

(137.9)

Tee

Two-Pipe

Remote-Mounted

T-Stat

(75.8)

(Reverse-Acting)

Airflow

Safety Switch

Stage 1

12.5

(86.2)

Stage 2

(96.5)

Stage 3

P.E. Stage Switch(es)

(Normally-Open)

Electric Heater Terminal Box

Literature Order Number

File Number

VAV-SVX02B-EN

SV-TD-VAV000-SVX02B-EN-0302

VAV-SVX02A-EN &VAV-IOM-6

La Crosse

Supersedes

Trane

Stocking Location

An American Standard Company

www.trane.com

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.

For more information contact

your local district office or

e-mail us at [email protected]

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