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Technical Bulletin

Issue Date January 7, 2003

© 2003 Johnson Controls, Inc. www.johnsoncontrols.com Code No. LIT-6363125Mounting and Wiring Variable Air Volume Modular

Assembly (VMA) 1400 Series Controllers

Mounting and Wiring VMA1400 Series Controllers............................3

Introduction......................................................................................................... 3

Key Concepts...................................................................................................... 4

VMA Position and Orientation...........................................................................................4

Damper Actuator Direction to Close..................................................................................4

N2 Address Switches........................................................................................................4

Wiring and Cabling Precautions........................................................................................5

General Wiring Information ...............................................................................................6

Power Source Wiring ........................................................................................................6

Phone Jack Polarization..................................................................................................10

Sensor Interfaces............................................................................................................11

Procedure Overview......................................................................................... 14

Detailed Procedures......................................................................................... 16

Preparing the VMA for Mounting.....................................................................................16

Mounting the VMA1410/1420..........................................................................................18

Mounting the VMA1430...................................................................................................19

Setting the Damper Position (VMA1410, 1420, or VMA1430 with External Actuator) ....19

Wiring the VMA ...............................................................................................................21

Connecting the N2 Bus ...................................................................................................24

Reference Information ..................................................................................... 26

VMA Wiring List...............................................................................................................26

VMA Single Duct Application Wiring Diagram.................................................................28

VMA Single Duct Supply/Exhaust Wiring Diagram .........................................................29

VMA Dual Duct Application Wiring Diagram ...................................................................30

VMA Internal Schematic Diagram...................................................................................32

Fabricating Your Own Interconnection Cable .................................................................34

Troubleshooting............................................................................................... 35

Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin2

Troubleshooting VMA Room Temperature Drift..............................................................35

Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin3

Mounting and Wiring VMA1400

Series Controllers

Introduction

The integrated VMA1410/1420, which includes a controller, actuator, and pressure sensor, mounts on the Variable Air Volume (VAV) terminal box. The VMA1430 mounts anywhere on the VAV box and is wired to a separate damper actuator. Note: This document focuses on the VMA1410, 1420, and

1430 controllers. The VMA1400 Series also includes the VMA1440,

which is a controller used exclusively as part of the Metasys® Zoning Package. See the Metasys Zoning Package Product Bulletin (LIT-639050) and the Metasys Zoning Package Overview Technical Bulletin (LIT-639100) for information on this specialized product. Instructions for wiring the VAV Modular Assembly (VMA) and its accessory devices are provided in this section.

This document describes how to:

prepare the VMA for mounting mount the VMA1410/1420 mount the VMA1430 set the damper position (VMA1410, 1420, or VMA1430 with external actuator) wire the VMA connect the N2 Bus Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin4

Key Concepts

VMA Position and Orientation

Consider the following when positioning and orienting the VMA: Mount the VMA on a vertical and flat surface where it functions best, such as the side of the VAV box. Route or loop the tubing, so a portion of it is lower than the pressure sensor, to create a moisture trap that prevents any condensation from entering the sensor. Do not make any sharp bends in the tubing, as this could collapse the tube and block the pressure path.

Verify wiring terminals are accessible.

Ensure that no extra mounting brackets, linkage, or couplers are required for standard mounting. Locate the VMA so that it has adequate clearance for future servicing and is protected from moisture and corrosive fumes.

Damper Actuator Direction to Close

The damper actuator direction to close establishes upon installation of the VMA, using HVAC PRO software. The damper must be manually positioned to allow the VMA actuator to fully open and close the damper. Incorrect damper positions in a zone can lead to misdiagnosed readings, resulting in unnecessary repetition of setup and diagnostics.

N2 Address Switches

It is best, from an accessibility standpoint, to set the N2 switches before mounting the VMA. The switches, located on the side of the VMA, are set to On for the address numbers indicated on the room schedule or building drawings. Use Addresses 1-253 only. Addresses 0, 254, and 255 are reserved. Refer to the Preparing the VMA for Mounting section in this document for further information. If software addressing is used, N2 switches must be set to 0 or 255. See the HVAC PRO User's Guide for details on software addressing. Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin5

Wiring and Cabling Precautions

WARNING: Risk of Electrical Shock or Equipment Damage. To avoid damaging equipment or possible electrical shock, ensure that all power supplies to the system are disconnected prior to wiring.

CAUTION: Risk of Equipment Damage.

Shorting of Binary Outputs (BOs) while energized will destroy the VMA output triac. Read these precautions before touching the terminals or wiring the

VMA and its accessories:

Make all wiring connections in accordance with the National Electrical Code (NEC) and state and local regulations. For transformer primaries above 150 VAC, the secondary must be earth grounded at the transformer to meet NEC. Terminal 1 can be earth grounded. Grounding on Terminal 1 results in 24 VAC being applied to DCOM with respect to earth. Note: 24 VAC to 24 VAC isolation transformers are not necessary. The power supply is internally isolated. For specific methods for wiring the VMA to meet UL 864 requirements, refer to the Metasys Smoke Control Wiring Technical Bulletin (LIT-636331). Terminal 3 is an earth ground connection (optional). Locate equipment and route the wiring so that twisted pair signal wiring is separated from power wiring by at least 150 mm (6 in.). Make all wiring connections to the VMA using only copper conductors. To establish tight, reliable electrical connections, use the correct wire sizes for the terminals. Avoid very thin solid wires, such as 26 AWG or less than 0.6 mm, which tend to break. Daisy chain the N2 Bus. The use of Y or T connections without a repeater installed as the T-tap may cause a loss of communications. Make sure that there is at least one End-of-Line termination on the N2 Bus (usually at the Network Control Module [NCM] or N30). Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin6

Do not run N2 Bus, Zone Bus, Analog Input (AI), Binary Input (BI), Analog Output (AO), or Binary Output (BO) wiring in the same conduit as line voltage wiring (above 30 VAC), or with wiring that switches power to highly inductive loads such as contactors, coils, motors, or generators. Run Zone Bus, AI, AO, and BI wiring in the same bundle or conduit where convenient. If the BO wiring is not wired through other switches or contacts, such as actuator end-of-travel switches, bundle it with the other Input/Output (I/O) wiring where convenient.

General Wiring Information

The following are general wiring considerations:

The VMA includes isolated N2, isolated binary outputs, and isolated 24 VAC. The 24 VAC power input is internally transformer isolated by the VMA. To meet NEC requirements for line voltage greater than

150 VAC, Terminal 1 can be earth grounded.

Up to ten cooling-only controllers (VMA1410) can be powered from one 100 VA low-voltage, power-limited, Class 2 transformer. See Power Source Wiring below for more information. Conduit is not required by the NEC for Class 2 wiring installations. Large insulated spade lugs with a polarizing tab (for high voltage) do not fit on the VMA.

Power Source Wiring

To calculate the number of VMAs that can be powered from one 100 VA unit, use the equation below. In this equation, the value Total VA equals the total VA consumed by the VMA, actuator, and output loads.

VATotal100 r TransformeVA 100per VMAs

Table 1 shows the power rating for each cooling/heating coil valve actuator. The valve power plus the VMA power (1410/1420 = 10 VA;

1430 = 3 VA) must not exceed 100 VA. If a device is not listed in

Table 1, refer to the product literature for that device. Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin7

Table 1: Actuator VA Power Rating

Actuator Type Power Rating

VA-8020Incremental 4 VA

VA-8050Incremental 6 VA

VA-7150Incremental 2.7 VA

VA-7153Incremental w/feedback 2.7 VA

JS/JT Series Electric Zone

ValveOn/Off 7 VA

JM Series Electric Zone

Valve with JT Series

ActuatorIncremental 1.2 VA

JM Series Electric Zone

Valve with JP Series

ActuatorVoltage (0 to 10 VDC) 1.6 VA

VA-8122Voltage (0 to 10 VDC) 4 VA

VA-7152Voltage (0 to 10 VDC) 4.7 VA

VA-7200Incremental 6.7 VA

VA-7203Incremental w/feedback 6.7 VA

VA-7202Voltage (0 to 10 VDC) 8.7 VA

GE RR-7 or TouchplateLighting relay 42 VA for 50 ms*

VA-7450Incremental 2.5 VA

VA-7452Voltage (0 to 10 VDC) 2.5 VA

VA-7040Thermal (DAO) 3 VA

VA-7310Incremental 2 VA

VA-7312Voltage (0 to 10 VDC) 2 VA

VA-7010On/Off 7 VA

VA-4233-BGA-2On/Off, Spring Return 12 VA

VA-4233-AGA-2Incremental, Spring Return 12 VA

VA-4233-GGA-2Voltage (0 to 10 VDC),

Spring Return12 VA

M9106-AGA-2Incremental 2.5 VA

M9106-GGA-2Voltage (0 to 10 VDC) 3.2 VA

M9206-BGA-2On/Off, Spring Return 16 VA

M9206-AGA-2Incremental, Spring Return 16 VA

M9206-GGA-2Voltage (0 to 10 VDC),

Spring Return16 VA

M9104-AGA-2NIncremental 3.4 VA

M9104-AGA-2Incremental w/conduit 3.4 VA

M9104-AGS-2NIncremental w/DPT-2015 3.4 VA

M9104-GGA-2Proportional 0-10 V 5 VA

M9104-GGC-2Proportional 0-10 V

w/conduit5 VA * Do not schedule all lights on one transformer to turn on at the same time. The current surge on the transformer could open the circuit breaker. Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin8

When using a single transformer to power multiple VMAs, use a wire gauge large enough to handle the current and minimize the voltage drop. The voltage drop depends on the current draw, wire gauge, and wire length. On a fully loaded 100 VA transformer, a 120 VAC primary draws only 0.8 amperes, while the 24 VAC secondary draws

4 amperes.

The standard 2.5 mm

2 (14 AWG) cable (Example 1 in Figure 1) is limited to 27 m (88 ft) with ten cooling-only VMAs, all at one end of the cable. If the transformer is centered (Example 2 in Figure 1) with five VMAs on the left and five VMAs on the right, the distance in each direction can be increased. This is because both the current and voltage drop are halved. In this example, both the left and the right legs could be increased to 54 m (176 ft) from the transformer (50 VA from each leg), creating a 108 m (352 ft) total length. < 88 ft of 14 AWG >

24 VAC

< 176 ft of 14 AWG > < 176 ft of 14 AWG >100 VA

24 VAC

100 VA

VMAVMAVMAVMAVMAVMAVMA

VMA

VMAVMA

VMAVMA

VMAVMA

Example 1: All ten VMAs are at one end.

Example 2: Transformer is centered.

VMAVMA

VMA VMA

VMAVMA

Cable_lg

Figure 1: Power Cable Lengths

There are two ways to connect power and loads to the VMA.

Individual spade lugs accept a single 4 mm

2 to 0.8 mm (10 to 22 AWG) wire and fit on 6 mm (1/4 in.) tabs, or optional screw terminals can be assembled over the spade lugs. The screw terminals accept up to a single 4 mm 2 (12 AWG) wire or two 2.5 mm 2 (14 AWG) wires. When two wires are crimped into one spade lug, a wire nut (to connect two heavy wires to a short 152 mm [6 in.] thinner wire) or a larger spade lug barrel is needed. Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin9

The following tables indicate the relationship between cable length and power at the end of wires. Table 2: Maximum 24 VAC Secondary Cable Length for Given Power/Gauge (U.S. Measurements)

Cable Size

8 Gauge 10 Gauge 12 Gauge 14 Gauge 16 Gauge 18 Gauge

Power (VA) at

End of Wire Cable Length (ft)

103520 2200 1400 880 550 350

201760 1110 700 440 275 175

301173 740 467 293 183 117

40880 555 350 220 138 88

50704 444 280 176 110 70

60587 370 233 147 92 58

70503 317 200 126 79 50

80440 278 175 110 69 44

90391 247 156 98 61 39

100352 222 140 88 55 35

Table 3: Maximum 24 VAC Secondary Cable Length for Power/Wire

Gauge (Metric Measurements)

Cable Size

4 mm 2

2.5 mm

2

1.5 mm

2

Power (VA) at

End of Wire Cable Length (Meters)

10427 268 168

20213 134 84

30142 89 56

40107 67 42

5085 54 34

6071 45 28

7061 38 24

8053 34 21

9048 30 19

10043 27 17

Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin10

Phone Jack Polarization

Figure 2 illustrates the polarization of the 6-pin and 8-pin phone jacks on the VMA or room sensor (TE-6700 or TMZ1600). Pin 1 is to the extreme left as you face the jack opening, tab notch down. Note: If you need to create your own cable, refer to Fabricating

Your Own Interconnection Cable

in the Reference Information section of this document. Otherwise, order pre-terminated cables.

8-pin 6-pinVMA

Room Sensor

phonejac Pin 1

Figure 2: Phone Jack Polarization

Table 4: TE-6700 Phone Jack Pin Identification

8-Pin Phone Jack on VMA 6-Pin Phone Jack on TE-6700

Pin Signal Pin Signal

1BI-1 Temp Occ1Not used

2AI 2 Zone Setpoint2+15 VDC

3AI 1 Temperature Sensor3COM

4COM for AI-14Not used

5+15 VDC5Zone Bus (ZB)

6ZB COM/LED BI COM6Not used

7COM for AI-2

8ZB+

Table 5: TMZ Phone Jack Pin Identification

8-Pin Phone Jack on TMZ 6-Pin Phone Jack on TMZ

Pin Signal Pin Signal

1Not used1Not used

2Not used2+15 VDC

3AI1, Zone Temperature Sensor3COM

4AI1, Sensor Common4Not used

5+15 VDC5Zone Bus (ZB)

6Supply/Zone Bus Common6Not used

7Not used

8Zone Bus

Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin11

Sensor Interfaces

Figures 3, 4, and 5 show interfaces between room sensors and the VMA. For more information on the TE-6700 room sensor (including

DIP switch settings), see the

TE-6700 Series 2nd Generation

Temperature Elements Installation Bulletin (LIT-216332) CAUTION:Intermittent connections can occur when small gauge solid wire is crimped into large spade lugs or a when a phone jack is poorly crimped. Any of the following situations can cause AI drifting:

26 gauge solid wire is crimped in a 18-22 gauge stranded spade

connector.

Phone jack is poorly crimped.

Pliers or something other than crimping tool is used to crimp the spade lug. Paint or other material is on phone jack connector.

See the

Troubleshooting section for more information.

1 2 3 4 5 6 7 8 1 2 3 4 5 6 BI-1

AI-2 (Setpoint)

AI-1 (Zone Temperature)

AI-1 COM

+15 Volts DC +15/Zone Bus COM (Not BCOM)

AI-2 COM

Zone Bus/N3+Sensor

1.6 K ohm

Setpoint Potentiometer

6-pin Phone Jack

on TE-6700 +15 Volts DC

Zone Bus

COM

8-pin Phone Jack

on TE-6700Screw

Terminals

TE6X 4 1 2 5 6 3 7

LED*Manual

Override

1 K ohm

8

Preferred DIP Switch

Position for TE-6700 (LED On)

O N

1 2 3

Figure 3: TE-6700 Phone Jack Interface to VMA

Mounting and Wiring Variable Air Volume Modular Assembly (VMA) 1400 Series Controllers

Technical Bulletin12

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