14.STANDARD HEAT TRANSFER SYSTEM TROUBLE SHOOTING CHART

 

Problem

Cause

Corrective Action

 

 

Main power feed off

Turn on main power

 

 

 

 

 

 

Circuit breaker off

Turn on circuit breaker

A

 

 

 

Power light off

Control transformer

 

 

 

Primary fuse blown

Replace fuse

 

 

Secondary fuse blown

Replace fuse

 

 

Transformer bad

Check and/or replace

 

 

Pilot light blown

Replace bulb

 

 

Float switch open

Add oil to system

B

Power light on, pump will not start

 

If no float switch, jumper terminals 4 & 5

Motor overloads tripped

Reset overloads, check running current

 

 

 

 

 

 

 

 

Motor starter bad

Check motor starter coil

C

Power light on, pump light on, motor

Motor fuse blown

Replace fuse, check motor overloads

 

 

 

not running

Motor burned out

Replace motor, check motor for overload

 

 

 

 

 

 

Broken belt

Check and replace belt

D

Power light on, pump light on, motor

Broken coupling

Check and replace coupling

 

Turn off system and rotate pump by hand

 

running, pump not running

 

 

 

Pump jammed by slag or foreign object

if jammed, disassemble and clean pump.

 

 

 

Check and clean strainer.

 

 

 

 

 

Power light on, pump light on,

Control relay #1 not closed

See M

E

 

 

motor running, pump running heat

Heat on-off switch in off position

Turn switch to on

 

will not come on

 

 

 

Process control ITC-1 set too low

Set process control to desired temperature

 

 

 

 

 

 

 

 

 

See items, pump noisy, see O;

 

 

No oil flow

insufficient suction pressure, see J:

 

 

 

high discharge pressure, see K

F

 

 

 

Insufficient heat

Process piping too small or restricted

Check process piping, check heat transfer

 

 

 

area of platen, etc.

 

 

Heater fuses blown

Check and replace fuses

 

 

 

 

 

 

Heater elements burned out

Check continuity and resistance of

 

 

 

elements

 

 

Excessive operating pressure over

See K

 

 

40 psig

 

 

 

 

 

 

 

Packing gland loose

Check and adjust packing gland nuts per

 

 

 

manufacturer’s recommendations

G

 

 

 

Pump packing gland leaking

Wrong pump specified

Use mechanical seals or sealless pumps

 

 

where no oil leaks can be tolerated

 

 

 

 

 

 

 

 

 

 

Mechanical seals on pumps should be

 

 

Improper cooling of seals

water cooled over 350°F.

 

 

Failure to do so will cause seal failure

 

 

 

 

 

 

and leaks.

H

 

 

Check piping and flange alignment

System leaks when filling

Rough handling during shipment

retighten and torque all bolts to

 

 

 

specifications

 

 

 

 

 

 

Expansion and contraction due to

Check all flange bolts and connections

I

System leaks at temperature and after

temperature has loosened connections

retighten and torque to manufacturer’s

 

specifications

cool down

 

 

 

 

 

Wrong gasket materials

Replace gaskets as necessary, use spiral

 

 

 

 

 

wound or Grafoil® gaskets

 

 

 

 

-5-

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Chromalox PQ410-4 service manual Standard Heat Transfer System Trouble Shooting Chart, Problem Cause Corrective Action

PQ410-4 specifications

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