Replace Mzlp - Graco Therm-O-Flow 20 Instructions - Parts Manual

Repair

Replace MZLP

1. Turn the Main Power Switch OFF.
2. Disconnect the heated hose electrical connectors
from the MZLP (111 or 112).
3. Note the location of each cable, then unplug all
cables from the MZLP (111 or 112) that will be
replaced.
4. Remove the four screws (115) securing the MZLP
(111 or 112) to the electrical enclosure, then
carefully remove the MZLP from the electrical
enclosure.
F . 32: MZLP Identification
IG
5. Replace MZLP.
a. To replace MZLP #1, remove the daughter card
and standoffs, and re-install them on the new
MZLP #1.
b. To replace MZLP #2 of #3, remove the jumper
(162) from MZLP #2 or #3 J5 connector and
reinstall it on the new MZLP J5 connector.
54
115
111
112
112
J5
6. To reassemble the MZLP, set the MZLP rotary
switch based on location. See Table 10 MZLP
Rotary Switch.
7. Use the four screws (115) to install the MZLP (111
or 112) to the electrical enclosure.
8. Reconnect the cables to the MZLP.
NOTE: Do not force the electrical connection. Minimal
force is required to seat the connector. If resistance is
felt, stop and verify the connector orientation.
NOTE: If unable to determine the connector location,
see Electrical Schematics, page 61.
9. Connect the heated hose electrical connectors to
the new MZLP.
NOTE: The MZLP may need updated software. See
Update Software, page 60.
Table 10 MZLP Rotary Switch
MZLP System
#1 with Daughter Primary
Card
Secondary
#2 Primary
Secondary
#3 Primary
Secondary
Rotary Switch
1
5
2
6
3
7
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