Chromalox PQ410-4 User Manual download pdf

PQ410-4

161-048978-001

JULY, 2009

4 CES

SERVICE MANUAL

(Supersedes PQ410-3)

Electric Fluid Heat Transfer Systems

GENERAL

This Service Manual is furnished as an aid to help start-up and

service Chromalox Heat Transfer Systems. Listed below are con-

ditions which could occur during start-up and operation.

CAUTION: Hazard of Electric Shock. Any installa-

tion involving electricity must be grounded to earth

to eliminate shock hazard.

1. USE THE RIGHT HEAT TRANSFER FLUID

DO read manufacturer’s technical bulletins and instructions care-

fully. Some heat transfer fluids may ignite or burn spontaneously

if not properly used.

Chromalox Fluid Heat Transfer Systems are designed for a par-

ticular heat transfer fluid or a class of heat transfer fluids. If you

are not sure you are using an accepted heat transfer fluid, check

with your local Chromalox sales and application engineering

office listed on back cover or consult Chromalox Bulletin PQ301

for the correct heat transfer fluid.

DO NOT

mix heat transfer fluids unless authorized and approved

by the fluid manufacturer.

All heat transfer fluids are not compatible with each other,

whether made by the same manufacturer or a different manufac-

turer. If you plan to switch fluids, check with the fluid manufac-

turer to determine the following.

A. Is the new fluid compatible with the old?

B. What is the recommended cleaning method to remove the old

fluid, its sludge, or any deposits remaining in the system?

C. Does the fluid manufacturer have a reclaiming service for used

fluid? Do they have a recommended procedure for disposal of

used or old fluid?

CAUTION: To avoid possible damage to the heaters

do not energize the heater unless the system is

filled with fluid.

provide for expansion and contraction of process piping and

connections to the system. Piping strains can cause pump and

motor mis-alignment, excessive wear on pump body, bearings and

stuffing box packing or mechanical seal and will eventually cause

failure of the pump and system.

Piping should be properly supported so pump can be removed

without changing the position of the piping. If piping moves when

the pump is removed, pump malfunction is probably due to stress-

es and twisting caused by the piping. These stresses will multiply

when the system is hot due to thermal expansion.

provide sufficient cross sectional area in the process piping

connections equivalent to the system pipes. In order to prevent

undue pressure drop, maximum velocity in all piping should be

less than 10 feet per second.

DO NOT

use process piping connections smaller than the pipes

used in the system.

If there is a high differential pressure between the inlet and out-

let of the heat transfer system at operating temperature, this is

probably due to a piping restriction. A continuing high differential

pressure can cause excessive wear on the pump and pump stuffing

box packing or mechanical seal and will eventually cause prema-

ture failure of the pump. The major causes of restrictions are:

A. Inlet and outlet pipes smaller than provided on the system.

B. Piping many processes in series with one another. To reduce

the pressure drop of the system, equipment should be re-piped

in balanced parallel flow.

2. PIPE STRAIN

3. PIPING RESTRICTIONS

1 2 3 4 5 6

Summary of Contents

Page 1 - SERVICE MANUAL

Page 2 - 6. EXPANSION TANK LOCATION

C. The use of globe valves in the system. Globe valves have amuch higher pressure drop than gate valves. Therefore useglobe valves only for balancing

Page 3 - 9. PUMP PACKING ADJUSTMENT

Note: If the expansion tank cannot be mounted above the highestpoint in the system, or if the system is going to operate above theboiling temperature

Page 4 - 12. MISCELLANEOUS PROBLEMS

10. OPERATING ABOVE THE MAXIMUM ALLOWABLE TEMPERATURE OFTHE HEAT TRANSFER SYSTEM OR HEAT TRANSFER FLUID11. INSUFFICIENT HEAT12. MISCELLANEOUS PROBLEMS

Page 5

-5-14. STANDARD HEAT TRANSFER SYSTEM TROUBLE SHOOTING CHARTProblem Cause Corrective ActionMain power feed off Turn on main powerCircuit breaker off Tu

Page 6 - Limited Warranty:

2150 N. RULON WHITE BLVD., OGDEN, UT 84404Phone: 1-800-368-2493 www.chromalox.com14. STANDARD HEAT TRANSFER SYSTEM TROUBLE SHOOTING CHARTProbl

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