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Automatic Floor Pressurization Sensor

for Uniflair CW — Installation

Overview

The Automatic Floor Pressurization Sensor (AFPS) detects a decrease in below-floor air pressure

caused by lifted floor tiles or airflow demand created by rack based cooling systems. By modulating

fan speed, an AFPS kit for your Uniflair Chilled Water (CW) Unit compensates for these changes in

air pressure.

The AFPS kit is supported by the following Uniflair CW models:

• TDCV0700

• TDCV1000

• TDCV1200

• TDCV1700

• TDCV2500

• TDCV3400

• TDCV4000

• TDCV4300

Safety Notices

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Turn off all power supplying this equipment before working on the equipment.

Failure to follow these instructions can result in death or serious injury.

WARNING

HAZARD FROM MOVING PARTS

Keep hands, clothing, and jewelry away from moving parts. Check the equipment for

foreign objects before closing the doors and starting the equipment.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.

Summary of content (12 pages)

PAGE 1
Automatic Floor Pressurization Sensor for Uniflair CW — Installation Overview The Automatic Floor Pressurization Sensor (AFPS) detects a decrease in below-floor air pressure caused by lifted floor tiles or airflow demand created by rack based cooling systems. By modulating fan speed, an AFPS kit for your Uniflair Chilled Water (CW) Unit compensates for these changes in air pressure.
PAGE 2
Inventory na4083a Item Description AFPS controller Power supply harness Above-floor pressure sensor tubing Below-floor pressure sensor tubing Communication wiring Installation hardware tLAN card Mounting bracket Installation Cooling Unit Shutdown 1. From the controller display, put the unit in stand-by and wait for the fans to stop. 2. Turn the disconnect switch to the OFF position.
PAGE 3
Attaching the controller box Note: The mounting location of the AFPS controller varies per Uniflair CW unit model. Installation location for AFPS controller Mounting bracket Unit bracket AFPS controller 1. Determine the mounting location on the unit bracket. Align the mounting bracket with the unit bracket, and fasten with a screwdriver. 2. Using a standard screwdriver, remove the front cover and rear tabs from the AFPS controller. 3.
PAGE 4
Installing the sensors To install the below-floor sensor: 1. Locate the mounting point for the sensor head, and route the tubing through the bottom of the unit and underneath the floor tiles to this location. Note: Avoid placing the positive pressure sensor head under the raised floor where the airflow velocity is high: for example, directly beneath the unit. The recommended position for the pressure sensor head is 3–4 m (10–13 ft) away from the unit. 2. Fasten the mounting clamp to a raised floor post. 3.
PAGE 5
Note: If the unit is not in the air-conditioned room, the tubing can be installed using the wall mounting bracket provided with the kit. To mount the above-floor pressure sensor head to a wall: 1. After determining an appropriate location for the sensor, drill a hole through the wall and mount the sensor bracket. WARNING HAZARD TO EQUIPMENT OR PERSONNEL Verify that the area behind the wall is free of electrical wires or piping before drilling holes into the wall.
PAGE 6
tLAN connection CAUTION HAZARD TO EQUIPMENT Circuit boards contained within this unit are sensitive to static electricity. Use one or more electrostatic-discharge device while handling the boards. Failure to follow these instructions can result in equipment damage. 1. Using a screwdriver, remove the Analog Selection cover on the controller inside the unit. 2. Cut or pry out the pre-cut plastic section (right-side) from the cover to access the tLAN card slot. 3.
PAGE 7
4. Put the cover back on the controller and snap into place. Supply power connections 1. Route the tLAN cables and supply power harness to the electrical panel. 2. Connect J3 from the AFPS to the green connector on the tLAN card. 3. Fasten the grounding wire from the harness to the back plate of the unit using the grounding screw (supplied). Grounding screw 4. Attach the electrical wires to the 24V AC power terminals provided in the terminal block of the Uniflair CW unit.
PAGE 8
The following figure shows an example of an installed AFPS controller. Note: The location of components in the electrical panel vary per Uniflair model.
PAGE 9
Configuration Settings To configure the operating parameters of the unit: 1. Through the controller display, put the unit in stand-by mode and wait for the fans to stop. 2. From the main screen press the Prg key, select Service Menu and press Enter to confirm. 3. Type in the Service Password (see the envelope attached to the manual) and press Enter to confirm. 4. Select Hardware Settings and press Enter to confirm. 5.
PAGE 10
Evaporating fan regulation Setpoint: the reference pressure value that needs to be maintained by the modulation of the fans Dead Band: dead band regulation Regul. Band: proportional regulation band Integral Time: integral time Derivat. Time: derivative time Air pressure: the reading taken by the sensor Evaporating Fan: evaporating fan regulation percentage Alarm parameters Setpoint Dead Band Regul. Band Integral Time Derivat.Time Air Pressure Pa Pa Pa Pa Evaporating Fan 020.0 000.0 160.
PAGE 11
Configuration Settings with Units in a LAN To configure fan speed modulation for several units connected through in a LAN, complete the following steps: 1. From the main screen press the Prg key, select Settings Menu and press Enter to confirm. 2. Insert the Password Settings (see the envelope attached to the manual) and press Enter to confirm. 3. Select LAN Settings and press Enter to confirm. 4. Scroll through the screens by pressing the Down key until the Parameters Setting screen appears. 5.
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Customer support and warranty information is available at the APC Web site, www.apc.com. © 2012 APC by Schneider Electric. APC, the APC logo, and Uniflair are owned by Schneider Electric Industries S.A.S., American Power Conversion Corporation, or their affiliated companies. All other trademarks are property of their respective owners.