Cleaning The Evaporator - Trane Optimus RTHD Installation, Operation And Maintenance Manual

Water-cooled chillers

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Table Of Contents

Table of Contents

Maintenance

Figure 39. Waterbox lifting

Cables, Chains or Slings

Connection Device

Waterbox

6. Disconnect water pipes, if connected.

7. Remove waterbox bolts

8. Lift the waterbox away from the shell.

WARNING

Overhead Hazard!

Failure to follow instructions could result in death or

serious injuries.

Never stand below or in close proximity to heavy

objects while they are suspended from, or being lifted

by, a lifting device in case the object drops.

9. Store waterbox in a safe and secure location and

position.

10. Work a round nylon or brass bristled brush (attached to

a rod) in and out of each of the condenser water tubes

to loosen the sludge.

11. Thoroughly flush the condenser water tubes with clean

water.

Note: To clean internally enhanced tubes, use a bi-

directional brush or consult a qualified service

organization for recommendations.

Reassembly.

Once service is complete the waterbox

should be reinstalled on the shell following all previous

procedures in reverse. Use new o-rings or gaskets on all

joints after thoroughly cleaning each joint.

•

Torque waterbox bolt in a star pattern. See

torque values.

Table 21. RTHD Torque

Evaporator

65 ft-lbs (88 Nm)

Table 21

Condenser

65 ft-lbs (88 Nm)

Table 22. Waterbox weights

(a)

Waterbox Size

Evaporator

D/E

B/C

Condenser

E/F

B/D

(a) Evaporator size is Digit 14 in the model number. Condenser is Digit 21

in model number.

(b) Lifting connection size M12x1.75.

kg (300 lbs). Lifting lug connection is M12x1.75.

Table 23. Connection devices

Unit

Product

Safety Hoist Ring

RTHD

M12x1.75

Obtain the required parts from your local Trane Parts

Center.

Chemical Cleaning Procedure

•

Scale deposits are best removed by chemical means.

Consult a qualified water treatment specialist (i.e., one

that knows the local water supply chemical/mineral

content) for a recommended cleaning solution suitable

for the job. (A standard condenser water circuit is

composed solely of copper, cast iron and steel.)

Improper chemical cleaning can damage tube walls.

All of the materials used in the external circulation system,

the quantity of the solution, the duration of the cleaning

period, and any required safety precautions should be

approved by the company furnishing the materials or

performing the cleaning.

Note: Chemical tube cleaning should always be followed

by mechanical tube cleaning.