FXVMA
Installation Instructions
LP-FXVMAxx-x
Part No. 24-10143-47, Rev. D
Issued April 16, 2009
Supersedes February 4, 2008
Applications
This document covers the mounting and wiring of the
FXVMA Variable Air Volume (VAV) Box Controller. For
more information about programming, configuring,
downloading, and/or commissioning the FXVMA, refer
to the FXVMA VAV Box Controller Technical Bulletin
(LIT-12011249).
The FXVMA is a VAV box controller in the Facility
Explorer line of products. The FXVMA is an integrated
assembly consisting of a high performance digital
controller, fast response actuator, and an accurate
Differential Pressure T ransducer (DPT), all of which are
pre-wired together and integrated inside a single
enclosure.
The FXVMA is fully programmable using FX Builder, or
you can select and configure a pre-defined VAV box
control application using FX Builder Express.
Various software and accessories are available to
assist you during the commissioning of the FXVMA and
the VAV box. This includes FX CommPro, which has
computer-based downloading and commissioning
capabilities; and the Medium User Interface, which has
an easy-to-use hardware interface.
The FXVMA includes an embedded communication
capability that enables the FXVMA to integrate into an
N2 or BACnet® Master-Slave/Token-Passing (MS/TP)
(depending on model) network of a building au tomation
system.
North American Emissions Compliance
United States
This equipment has been tested and found to
comply with the limits for a Class A digital device
pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection
against harmful interference when this equipment is
operated in a commercial environment. This
equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications.
Operation of this equipment in a residential area is
likely to cause harmful interference, in which case
the user will be required to correct the interference
at his/her own expense.
Canada
This Class (A) digital apparatus meets all the
requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la Classe (A) respecte
toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
Figure 1: FXVMA VAV Box Controller
FXVMA Installation Instructions 1
Installation
Observe these guidelines when installing the FXVMA:
• Transport the FXVMA in its original container to
minimize vibration and shock damage.
• Do not drop the FXVMA or subject it to physical
shock.
Accessories
Use Table 1 to order accessories.
Table 1: FXVMA Accessories Ordering
Information
Product
Code
Number
Y64T15-0 Transformer: 120/208/240 VAC Primary
Y65A13-0 Transformer: 120 VAC Primary to
Y65T42-0 Transformer: 120/208/240 VAC Primary
Y65T31-0 Transformer: 120/208/240 VAC Primary
AP-TBK1002-0 2-position screw terminal that plugs into
AP-TBK1003-0 3-position screw terminal that plugs into
Description
to 24 VAC Secondary, 92 VA, Foot
Mount, 30 in. Primary Leads and 30 in.
Secondary Leads, Class 2
24 VAC Secondary, 40 VA, Foot Mount,
8 in. Primary Leads and 30 in.
Secondary Leads, Class 2
to 24 VAC Secondary, 40 VA, Hub
Mount, 8 in. Primary Leads and
Secondary Screw Terminals, Class 2
to 24 VAC Secondary, 40 VA, Hub
Mount, 8 in. Primary Leads and
Secondary Screw Terminals, Class 2
spade lugs
spade lugs
2. Make sure the FXVMA base is parallel to the VAV
box (perpendicular to the damper shaft). If needed,
use a spacer to offset tipping of the FXVMA caused
by the shaft bushings.
IMPORTANT: When the air supply to the VAV box
is below 10°C (50°F), make sure that any
condensation on the VAV box (particularly on the
damper shaft) does not enter the electronics. Mou nt
the FXVMA vertically above the damper shaft to
allow any shaft condensation to fall away from the
FXVMA. Additional measures may be required in
some installations.
3. Secure the self-piercing No.10 screw through the
FXVMA mounting slot with a power screwdriver
and 100 mm (4 in.) extension socket; otherwise,
use a punch to mark the position of the shoulder
washer and then drill a hole into the V AV box using
a 3.5 mm (9/64 in.) drill bit.
4. Insert and tighten the mounting screw against the
washer.
IMPORTANT: Do not overtighten the screws, or the
threads may strip. If you plan to mount to the VAV
box, make sure the screws do not interfere with
damper blade movement.
5. Locate the damper position using the typical
marking on the end of the damper shaft (Figure 2).
FIG:d_shaft
Figure 2: Typical Damper End Shaft Icons
Mounting
To mount the FXVMA:
1. Place the FXVMA in the proper mounting positi on
on the damper shaft so that the wiring conn ectio ns
are easily accessible.
FXVMA Installation Instructions2
6. Note the direction, Clockwise (CW) or
Counterclockwise (CCW), required to close the
damper.
7. Grasp the damper shaft firmly with pliers and either
manually close the damper for 90° boxes or
manually open for 45° or 60° boxes.
8. Push down and hold the Manual Override button,
and turn the FXVMA coupler until it contacts the
mechanical end-stop at either the fully closed (90°
boxes) or fully open (45° and 60° boxes) position.
9. For 90° boxes, rotate the coupler in the direction
that the damper closes with the mechanical limit.
The open end-stop is automatically set for 90°
boxes.
Y o u must provide har d stops for 4 5° and 60° boxe s
at both fully closed and fully open damper
positions. By installing the FXVMA at the fully open
position, the FXVMA provides the open stop for the
box. The closed damper seal provides the fully
closed stop.
10. Tighten the square coupler bolt to 17 to 21 N·m
(150 to 185 lb·in.).
11. Loop the pneumatic tubing to include a trap for
condensation. Attach the tubing from t he FXVMA to
the VAV box flow pickup. The red tubing is
connected to the inlet or high pressure side and the
clear tubing is connected to the low pressure side.
12. Push the Manual Override button, and turn the
actuator coupling manually to ensure that the
actuator can rotate from full closed to full open
positions without binding.
13. Complete the mounting by rotating the damper to
the full open position.
CAUTION: Risk of Property Damage.
Rotate the damper to the fully open
!
position before starting the air handler.
Failure to rotate the damper to the full
open position may result in damage to
the Variable Air Volume box or ductwork
when the air handler is started.
Wiring
To wire the FXVMA:
1. Wire the analog and binary Inputs/Ou tputs (I/Os) to
the FXVMA.
2. Wire the Network Room Module (NRM) to the
FXVMA.
3. Daisy-chain the N2 or BACnet MS/TP bus to the
FXVMA’s Supervisory Link.
4. Connect power wiring to the FXVMA.
The channel assignments for the inputs and outputs
vary according to the control application configuration.
Obtain the actual I/O channel assignments from
FX Builder Express or FX Builder.
The wiring connections for the inputs and outputs vary
depending on the FXVMA application.
Universal Input Wiring Details
The FXVMA features one Universal Input (UI) that you
can configure to accept either a passive sensor, an
active sensor, or a main tained dry contact switch inpu t.
Table 2: FXVMA Universal Input Description
Terminal
Label
+15 V Sources 15 VDC power for active
IN 0-10 V Analog Input for active sensors
ICOM Signal common for IN terminal (isolated
Passive Sensor Connection
The UI accepts a 0-600k ohm input signal from a
passive (resistive type) sensor. The UI has an internal
12 V, 15k ohm pullup. See Figure 3.
RTD TEMPERATURE
Figure 3: Passive Sensor Connection
Function and Electrical Ratings/
Specifications
devices
35 mA total current
Internal 75k ohm pulldown
or
0-600k ohm Analog Input for passive
sensor (resistive temperature sensor)
Internal 12 V, 15k ohm pullup
or
Dry contact Binary Input
Internal 12 V, 15k ohm pullup
from all other terminal commons)
FXVMA
+15
IN
ICOM
ELEMENT
UNIVERSAL
FIG: PassiveSensor
FXVMA Installation Instructions 3
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