Replacement Instructions for the Water Temperature Sensor HP Modular Cooling System

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Replacement Instructions for

the Water Temperature

Sensor

HP Modular Cooling System

About this document

This document describes the procedure for replacing the

water temperature sensor of an HP Modular Cooling System

(MCS).

Customers who order a replacement water temperature sensor

are supplied with a kit that contains the spare water

temperature sensor. To replace the original water temperature

sensor, remove it from the MCS unit and replace it with the

new water temperature 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

WARNING: To reduce the risk of electric shock or

damage to the equipment, power off the MCS unit

by disconnectin

the two AC power cords connected

to the power inlet box at the rear of the MCS unit

before beginning the removal and replacement

procedures.

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 447488-001

April 2007 (First Edition)

Summary of content (12 pages)

PAGE 1
Replacement Instructions for the Water Temperature Sensor HP Modular Cooling System About this document This document describes the procedure for replacing the water temperature sensor of an HP Modular Cooling System (MCS). Customers who order a replacement water temperature sensor are supplied with a kit that contains the spare water temperature sensor.
PAGE 2
WARNING: To reduce the risk of electric shock or damage to the equipment, use extreme caution when removing and replacing components that involve water around the electrical wires and unsecured power inlet box. There is great risk of electrical shock when water is used near electricity. 5. Disconnect the network cable from the RJ-45 connector on the power inlet box.
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
b. Disconnect the X13 cable connector if you are 3. Using two 18-mm wrenches, tighten the cap nut over the water temperature sensor. 4. Route the water temperature sensor cable through to the front of the MCS unit. 5. Connect the water temperature sensor cable connector to the water group controller connector labeled either X12 or X13. repairing the outlet water temperature sensor. To replace this component, see "Replacing the water temperature sensor." Replacing the water temperature sensor 1.
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
2. 3. Slide the bottom fan unit inside the MCS unit on the sliding rails. Replacing the AC transfer switch 1. Connect the green and yellow ground bonding wires to the water group controller. 2. Connect the electrical power cables from the MCS unit to the AC transfer switch. Tighten the two thumbscrews to secure the fan unit to the MCS frame. a.
PAGE 11
b. Connect the three large cables, starting from the right and moving to the left, by pushing the cable into the connector. 5. Complete the operation checklist. 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. 3.
PAGE 12
Returning the failed component Instructions are provided on the return label supplied with the replacement component. The return label is either in the box in which the component was shipped or in the plastic pouch attached to the box. For further information about the Customer Self Repair program, see http://www.hp.com/go/selfrepair.