5 trouble shooting guide – Tweco PAK 10 User Manual
Page 31
Manual No. 0-0515
19
Service
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A-01894
Figure 4-E Components of Gas Pressure
Regulator
1. Inlet Connection
2. Inlet Pressure Gauge
3. Safety Valve
4. Working Pressure Gauge
5. Hose Connection
6. Adjusting Knob
4.5
TROUBLE SHOOTING GUIDE
If the unit malfunctions, the following table will be help-
ful in correcting the problem. Since the malfunction
may be due to a faulty connection rather than a faulty
component, be sure to check all connections to a com-
ponent that appears to be malfunctioning.
The trouble shooting table is arranged in the normal
operating sequence of the unit for easy reference. Each
problem has listed next to it the possible causes and
the remedy.
In some cases the remedy is too complex to fit in the
table, in which case there is a reference to one of the
TEST PROCEDURES.
WARNING
Removing the cover of a PAK 10 with a Run-
ning Gear also removes the retaining Chains
making the gas cylinders free standing. These
cylinders must be restrained by some temporary
means until the cover and the retaining bar are
replaced and the retaining chains reconnected.
When the external disconnect switch is closed, the red
“AC POWER” light goes on and the fan starts. When
the ON/OFF switch goes ON, the amber “READY”
light goes on and the gases flow for two seconds. If
this does not happen, check as follows:
A. No “AC POWER” light
1. Blown fuse or open circuit breaker at disconnect
a. Replace fuse or reset breaker.
B. No “READY” Light
1. Door interlock switch (LS) not actuated
a. Check switch and actuator tab.
2. Blown fuse 2FU
a. Check fuse.
3. Main transformer overheated
a. Allow unit to cool down.
C. Gases do not flow when READY light comes on
1. Gas supply not on
a. Open valves.
D. Gases flow more than 2 seconds
1. RUN/SET Switch in SET position
a. Switch to RUN.
2. Faulty post flow time delay (TD1)
a. Check time delay TD1 (See A, Test Proce-
dures).
E. Cannot set desired gas pressure
1. Empty cylinder
a. Replace.
2. Faulty regulator
a. Repair or replace.
3. Faulty solenoid valve
a. Replace.