Johnson Controls VMA 1400 Series User manual

Technical Bulletin

Issue Date 11/01/01

Code No. LIT-6363125

TECHNICAL BULLETIN

Mounting 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 .................................................................................................18

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

Mounting and Wiring VMA1400 Series Controllers Technical Bulletin

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

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

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

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

Mounting and Wiring VMA1400 Series Controllers Technical Bulletin 3

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 VMA1400 Series Controllers Technical Bulletin

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 the tubing so a portion of it is lower than the pressure

sensor, or loop the tubing. This creates a moisture trap that

prevents any condensation from entering the sensor.

•Do not make any sharp bends in the tubing. 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 is established 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 VMA1400 Series Controllers Technical Bulletin 5

Wiring and Cabling Precautions

WARNING: Possible Equipment Damage or Electrical

Shock.To avoid damaging equipment or

possible electrical shock, ensure that all power

supplies to the system are disconnected prior to

wiring.

CAUTION: 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 Underwriters Laboratories, Inc.

(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 VMA1400 Series Controllers Technical Bulletin

•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

TotalVA equals the total VA consumed by the VMA, actuator, and

output loads.

VATotal

100

rTransformeVA100perVMAs =

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 VMA1400 Series Controllers Technical Bulletin 7

Table 1: Actuator VA Power Rating

Actuator Type Power Rating

VA-8020 Incremental 4 VA

VA-8050 Incremental 6 VA

VA-7150 Incremental 2.7 VA

VA-7153 Incremental w/feedback 2.7 VA

J Series Electric Zone Valve On/Off 7 VA

VA-8022 Voltage (0 to 10 VDC) 4 VA

VA-8052 Voltage (0 to 10 VDC) 6 VA

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

VA-7200 Incremental 6.7 VA

VA-7203 Incremental w/feedback 6.7 VA

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

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

VA-7450 Incremental 2.5 VA

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

VA-7040 Thermal (DAO) 3 VA

VA-7310 Incremental 2 VA

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

VA-7010 On/Off 7 VA

M9104-AGA-2N Incremental 3.4 VA

M9104-AGA-2 Incremental w/conduit 3.4 VA

M9104-AGS-2N Incremental w/DPT-2015 3.4 VA

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

M9104-GGC-2 Proportional 0-10V

w/conduit

5 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.

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 mm2(14 AWG) cable (Example 1 in Figure 1) is

limited to 27m (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 54m (176 ft) from the transformer

(50 VA from each leg), creating a 108m (352 ft) total length.

Mounting and Wiring VMA1400 Series Controllers Technical Bulletin

< 88 ft of 14 AWG >

24 VAC

< 176 ft of 14 AWG > < 176 ft of 14 AWG >

100 VA

24 VAC

100 VA

VMA

Example 1: All ten VMAs are at one end.

Example 2: Transformer is centered.

VMA

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 mm2to 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 mm2(12 AWG) wire or two 2.5 mm2

(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 VMA1400 Series Controllers Technical Bulletin 9

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)

3520

2200

1400

880

550

350

1760

1110

700

440

275

175

1173

740

467

293

183

117

880

555

350

220

138

704

444

280

176

110

587

370

233

147

503

317

200

126

440

278

175

110

391

247

156

100

352

222

140

Table 3: Maximum 24 VAC Secondary Cable Length for

Power/Wire Gauge (Metric Measurements)

Cable Size

4 mm22.5 mm21.5 mm2

Power (VA) at

End of Wire Cable Length (Meters)

427

268

168

213

134

142

107

100

Mounting and Wiring VMA1400 Series Controllers Technical Bulletin

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-pin

VMA 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 Occ 1Not used

2AI 2 Zone Setpoint 2+15 VDC

3AI 1 Temperature Sensor 3COM

4COM for AI-1 4Not used

5+15 VDC 5Zone Bus (ZB)

6ZB COM/LED BI COM 6Not 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 used 1Not used

2Not used 2+15 VDC

3AI1, Zone Temperature Sensor 3COM

4AI1, Sensor Common 4Not used

5+15 VDC 5Zone Bus (ZB)

6Supply/Zone Bus Common 6Not used

7Not used

8Zone Bus

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