Tweco 15XC Merlin - Manual (Page 95)

Manual 0-2251 5-23 CUSTOMER/OPERATOR SERVICE
5.11 TROUBLESHOOTING GUIDE (continued)
SYMPTOM POSSIBLE CAUSE REMEDY
F. No GAS indicator
(continued)
G. GAS indicator off, plasma
and/or secondary gas
does not flow
3. Jump switches one at a
time and check for indica-
tor to determine which
has failed. Replace switch
if necessary
4. See Section 5.12-Test F
and replace board if
necessary
5. See Section 5.12-Test F
and replace board if
necessary
6. With secondary mode set
to O 2 or H 2 O, check for
continuity from wire #52
to #55 on SW3-B. If open,
replace SW3-B
1. Normal operation (purges
plasma line only, secon-
dary does not flow)
2. No secondary flow is
normal operation in O
2
mode (but GAS indicator
should be lit)
3. Check plasma pressure,
check PS1 and replace if
necessary
4. Check secondary supply
5. Check solenoid for stick-
ing or clogging. Check coil
resistance (should be
approx. 400 ohms)
6. Check SW3-A for continu-
ity (wire 75 to 88 for
secondary gas, 75 to 89 for
secondary water)
7. See Section 5.12-Test G
and replace board if
necessary
3. Faulty pressure switch
(PS1 or PS2)
4. Faulty logic board
5. Faulty LED/current
control board
6. Faulty SW3-B (secondary
mode set to O 2 or H 2 O )
1. RUN/SET/PURGE switch
set to PURGE, secondary
mode switch set to GAS
secondary
2. Secondary mode set to O 2
3. Low plasma pressure or
faulty PS1
4. Secondary supply turned
off (or tank empty)
5. Faulty solenoid valve:
SOL1 - plasma gas,
SOL2 - secondary gas,
SOL3 - secondary water
6. Faulty switch (SW3-A)
(effects sec. gas or water
only, not secondary O
2
)
7. Faulty logic board