Replacement Instructions for the Flow Meter Paddle-Wheel Sensor HP Modular Cooling System

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Replacement Instructions

for the Flow Meter Paddle-

Wheel Sensor

HP Modular Cooling System

About this document

This document describes the procedure for replacing the flow

meter paddle-wheel sensor of an HP Modular Cooling System

(MCS).

Customers who order a replacement flow meter paddle-wheel

sensor are supplied with a kit that contains the spare flow

meter paddle-wheel sensor. To replace the original flow meter

paddle-wheel sensor, remove it from the MCS unit and

replace it with the new flow meter paddle-wheel sensor as

described in the following instructions.

HP Modular Cooling System Spare

Replacement video

Because of the difficulty of removing and replacing spare

parts, HP recommends watching the HP Modular Cooling

System Spare Replacement video. This video provides further

explanation and detail of replacement strategies and

techniques that might be helpful when attempting to remove

and replace spare parts. You can access the video on the HP

website (http://www.hp.com/go/mcs

Before you begin

CAUTION: To reduce the risk of the servers

overheating, open all of the rack doors of each rack

attached to the MCS unit while completing the

following procedures to increase air flow within the

rack.

The information contained herein is subject to change without notice. The only

warranties for HP products and services are set forth in the express warranty

statements accompanying such products and services. Nothing herein should

be construed as constituting an additional warranty. HP shall not be liable for

technical or editorial errors or omissions contained herein.

Part Number 441283-001

April 2007 (First Edition)

Summary of content (12 pages)

PAGE 1
Replacement Instructions for the Flow Meter PaddleWheel Sensor HP Modular Cooling System About this document This document describes the procedure for replacing the flow meter paddle-wheel sensor of an HP Modular Cooling System (MCS). Customers who order a replacement flow meter paddle-wheel sensor are supplied with a kit that contains the spare flow meter paddle-wheel sensor.
PAGE 2
Powering down the MCS unit Shutting off the water 1. Open the front MCS door. 1. 2. Turn off the AC1 and AC2 breakers on the AC transfer switch. Shut off the water flowing into the MCS unit at the facility-side shut-off valve. 2. Confirm that no water is flowing into the MCS unit. 3. Open the rear MCS door. WARNING: To reduce the risk of electric shock or damage to the equipment: • Do not disable the power cord grounding plug. The grounding plug is an important safety feature.
PAGE 3
. Loosen the two thumbscrews on the bottom of the fan unit. CAUTION: The fan unit weighs 16.8 kg (37 lb). Use extra caution when removing and replacing the top fan unit because it might be higher than your shoulders and is heavy and awkward to lift. 4. b. Lift the right side of the bracket up at a slant, and pull the bracket out of the MCS unit (2). IMPORTANT: Do not disconnect any of the internal electrical connections to the power inlet box. 3. Pull the power inlet box toward you until it stops.
PAGE 4
Removing the air sealing plate 1. 2. Disconnect the condensation hose from the condensation pump by pressing in the plastic collar quick connect on the condensation pump. Removing the air deflector plate 1. Loosen the two thumbscrews securing the air deflector plate to the MCS unit. 2. Disconnect the green and yellow ground bonding wire. 3. Lift the air deflector plate up, tilt it to an angle, and pull it out toward you. Loosen the two thumbscrews securing the air sealing plate to the MCS unit.
PAGE 5
2. Disconnect the two sensor connections from the condensation pump. 3. Slide the metal AC transfer switch box out toward you on the sliding rails. 3. Loosen the thumbscrew on the bottom of the condensation pump securing the condensation pump to the MCS unit (1), and lift the condensation pump from the MCS unit (2). 4. Using a T-25 Torx driver, remove the four Torx screws securing the AC transfer switch chassis to the water group controller chassis.
PAGE 6
a. Disconnect the three large cables, starting from the left and moving to the right, by inserting a small flathead screwdriver in between the cable connection and the latch, and pulling the cable out from the connector. b. Disconnect the three small cables, starting from the left and moving to the right, by pressing the small tab on the bottom of each small cable and pulling it out from the connector.
PAGE 7
5. Disconnect the paddle-wheel sensor cable connector, labeled X14, from the water group controller and pull the cable completely out of the MCS unit. 2. Screw on the plastic screw cap to secure the paddlewheel sensor to the flow meter. 3. Replace the plastic lock washer above the paddle-wheel sensor. 4. Route the paddle-wheel sensor cable through to the front of the MCS unit. 5. Connect the paddle-wheel sensor cable connector to the X14 connector on the water group controller.
PAGE 8
Replacing the condensation pump and sensors 1. 2. Align the condensation pump thumbscrew to the hole inside the MCS unit (1), and tighten the thumbscrew on the bottom of the condensation pump to secure it to the MCS unit (2). Replacing the air deflector plate 1. Reattach the ground bonding wires to the air deflector plate. 2. Align the two screw holes on the air deflector plate to the two screw holes inside the MCS unit. 3.
PAGE 9
2. Secure the air sealing plate to the MCS unit by tightening the two thumbscrews. 2. Push the power inlet box back into the MCS unit until it locks in place. 3. Connect the condensation hose to the condensation pump by inserting it into the plastic collar quick connect on the condensation pump. 3. Replace the outer support bracket. a. Lift the right side of the bracket up at a slant, and slide the bracket into the MCS unit. b.
PAGE 10
Replacing the bottom fan unit 1. 4. Using a T-25 Torx driver, secure the horizontal shipping bracket to the MCS unit by inserting four Torx screws. Align the fan unit to the sliding rails. CAUTION: The fan unit weighs 16.8 kg (37 lb). Use extra caution when removing and replacing the top fan unit because it might be higher than your shoulders and is heavy and awkward to lift. 2. Slide the bottom fan unit inside the MCS unit on the sliding rails. Replacing the AC transfer switch 3.
PAGE 11
a. Connect the three small cables, starting from the right CAUTION: To prevent damage to the cables and ensure proper fit of the transfer switch chassis, be sure to route all cables through the U-shaped opening in the rear of the chassis. and moving to the left, by pressing the tab on the bottom of each cable and pushing it into the connector. 4. Slide the metal AC transfer switch box back into the MCS unit on the sliding rails. 5. Complete the operation checklist. b.
PAGE 12
Operation checklist 1. If water was disconnected, restore water flow to the MCS unit at the facility-side valve. 2. If power was disconnected, restore power to the MCS unit. a. Open the rear MCS door. b. Connect the network cable to the RJ-45 connector on the power inlet box. c. Connect the two AC power cables to the power connectors on the power inlet box. d. Open the front MCS door. e. Turn on the AC1 breaker on the AC transfer switch. f. Turn on the AC2 breaker on the AC transfer switch. 3.