Murphy Switch Series LM300 User Manual

LM-92164N  
Revised 10-03  
Section 15  
Installation Instructions for Level Maintainers  
(00-02-0176)  
Model Series LM300  
Read the following instructions before installing. A visual inspection of this product for  
damage during shipping is recommended before mounting. These installation instructions are  
intended for all LM300 series models.  
GENERAL INFORMATION  
LM301-EX  
Shown with optional hose kit fittings  
WARNING  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
Disconnect all electrical power to the machine.  
Make sure the machine cannot operate during installation.  
Follow all safety warnings of the machine manufacturer.  
Read and follow all installation instructions.  
**  
Patent  
5493086  
LM300: Level Maintainer only (no switches).  
LM301: Low switch contacts for low level shutdown or  
alarm. Four wires, SPDT.  
Outlet Connection: 3/4-14 NPT left side, right side, and bottom.  
LM302: Two switches for low and high level shutdown or alarm. Four wires,  
DPST, wired N.O. in normal operating ranges.  
Crankcase Balance Vent Fitting: 1/2-14 NPT.  
Mounting: Accepts Murphy pipe mounting or universal mounting brackets.  
LM303: Two switches for low and high level shutdown or alarm. Four wires,  
DPST, wired N.C. in normal operating ranges.  
Lens: Clear “Frog Eye” non-staining, high impact, high temperature nylon; UV  
and heat stabilized.  
LM304: Two switches. Alarm before shutdown on low level and shutdown on  
low-low level. Four wires, DPST, wired N.O. in normal operating ranges.  
Dial: High visibility white background with green and white “index” lines for  
normal level indication.  
LM305: Two switches. Alarm before shutdown on low level and shutdown on low-  
low level. Four wires, DPST, wired N.C. in normal operating ranges.  
Test Knob: Rotate to test switch operation. Turn clockwise for low level test  
and turn counterclockwise for high level test.  
Specifications  
Flow Rate Test: Using SAE 30 @ 32°F (0°C).  
Case/Cover: Die cast aluminum.  
Orifice  
Flow Rates  
Switch Housing: Aluminum.  
Pressure  
Diameter  
††  
Approval Rating: LM301 thru LM305 : CSA certified for non hazardous  
locations. Enclosure Type 4 certified.  
LM301-EX thru LM305-EX: CSA certified for Class I, Groups C and D;  
Class II, Groups F and G hazardous locations. Enclosure Type 4 certified.  
4.7 GPH - 31.0 GPH  
(17.8 LPH - 117.3 LPH)  
4 ft. oil – 15 ft. oil  
(1.2 m oil – 4.6 m oil)  
1/4 in.  
*
(6 mm)  
††  
10 psig – 30 psig  
(68.9 kPa – 207 kPa)  
[.69 – 2.07 bar]  
1/8 in.  
(3 mm)  
16.9 GPH - 32.1 GPH  
(63.7 LPH - 121.5 LPH)  
Float: Rigid polyurethane foam. Polyurethane coated.  
Maximum Ambient Temperature: 250°F (121°C)  
Standard  
*
Oil Inlet Connection: Top entry 1/2-14 NPT with built-in filter screen (removable  
for cleaning).  
NOTE: Friction losses due to piping NOT considered.  
Inlet Orifices: 1/4 in. (6 mm) standard. 1/8 in. (3 mm) available.  
Optional Hose Kit: 15000355  
Quantity Description  
2
Wire (switch models): 18 AWG x 13 in. (1.0 mm x 330 mm).  
Maximum Inlet Pressure (MIP):  
Max. Differential: 2 in. (51 mm) between running and stationary oil level.  
30 psi (207 kPa) [2.07 bar].  
with 1/8 in. (3 mm) orifice.  
15 ft. oil (4.6 m oil)  
1
1
1/2 in. (13 mm) I.D. x  
3 ft. (914 mm) long hose  
1 in. (25 mm) I.D. x  
3 ft. (914 mm) long hose  
with 1/4 in. (6 mm) orifice.  
2
2
2
2
1/2 in. (13 mm) worm gear clamp  
1 in. (25 mm) worm gear clamp  
Maximum Case Pressure (MCP): 15 psi (103 kPa) [1.03 bar].  
Orifice Seal : Buna-N Thumb-Valve™  
1/2 NPT x 1/2 in. (13 mm) barbed fitting  
3/4 NPT x 1 in. (25 mm) barbed fitting  
Switch Contact: Silver, SPDT snap acting, 10A @ 125, 250VAC; 10A @ 30VDC.  
(1 only for low level; 2 only for high & low; or 2 only for low with alarm before shutdown)  
††  
CSA certified with switch contacts rated at 10 A @ 250 VAC (standard).  
** Products covered by this bulletin comply with EMC Council directive  
89/336/EEC regarding electromagnetic compatibility except as noted.  
LM-92164N page 1 of 4  
 
TYPICAL INSTALLATION continued  
4. Fill the crankcase to the proper oil levels. With the engine running and  
Crankcase (Oil Pan) Mounting  
warm, loosen the mounting bracket adjustment bolts and adjust the  
LM300 so that the oil level in the sight gauge is aligned with the white  
“index line” on the dial (Figure 4). Tighten the adjustment bolts securely.  
1. Install the universal bracket to the crankcase using the existing  
crankcase bolts (Figure 3A). Crankcase bolt diameter must be no larger  
than 7/16 inch (11 mm).  
Connecting the LM300 to an Oil Supply Tank  
(level maintaining models only)  
1. Remove the caplug from the oil inlet connection. Be sure the filter, inside  
Crankcase  
Bolt  
Universal  
Bracket  
the connection, is clear of debris. Install the oil inlet connection.  
2. Connect a 1/2 inch I.D. (13 mm) or larger hose  
to oil inlet fitting on the LM300 and to the shutoff  
valve on the oil supply tank. See Figure 5. For  
Crankcase  
Oil Supply  
Tank  
Note Clearance  
before mounting  
Adjustment  
Bolt  
models LM300 thru LM305 recommended  
minimum mounting of the oil supply  
Oil Inlet  
tank above the LM is 4 ft. (1.2m);  
Hose  
maximum 15 ft. (4.6m). The  
Figure 3B  
Figure 3A  
hose must maintain a  
NOTE: Check clearance between crankcase and mounting bracket  
before installing the mounting bracket. If space between the crankcase  
and mounting bracket does not allow installation and access to the  
adjustment bolts advance to Step 3.  
downward slope and not have  
low spots or droops.  
Maximum head pressure  
rating using standard 1/4 in. (6  
mm) orifice is 15 ft. (4.6  
meters). See Flow Rate test on  
page 1 for additional orifice pressure  
2. Mount the LM300 to the universal bracket using two 3/8-16 UNC x 1  
inch bolts supplied. DO NOT tighten the adjustment bolts too tight. You  
will have to adjust the LM300 later in the installation process.  
ratings.  
3. If space between the crankcase and mounting bracket is narrow, install  
the universal mounting bracket to the LM300 before installing to the  
crankcase oil pan.  
Figure 5  
3. Before filling the supply tank with  
oil, be sure the tank is clean and dry andthe shutoff valve is closed.  
Also, be sure all hoses and clamps are tight. Fill the tank with CLEAN  
oil.  
Connecting Fittings and Hoses  
The following instructions are for all LM300 series level maintainers.  
All steps that reference oil inlet or oil supply tank DO NOT apply to  
non-level-maintaining models. Also, these instructions are based on the  
Murphy optional hose kit described on page 1. If you did not order the  
optional hose kit, gather the hoses, clamps and fittings as specified in  
the optional hose kit.  
WARNING:Overfill condition can be caused by excessive  
inlet pressure, (maximum inlet pressure depends on orifice),  
and/or improper “vent to crankcase” installation.  
See Flow Rate Test on page 1 for maximum pressure.  
4. After oil supply tank is full, open the shutoff valve.  
1. Install the LM300 fittings in their proper locations. NOTE: Apply a  
sealant such as teflon, to all threaded connections.  
2. Attach the 1 inch (25 mm) diameter, flexible monitoring hose to the  
crankcase and the monitoring port on the LM300. See Figure 4.  
CAUTION: The hose must slope slightly downward from the LM300  
and MUST NOT have any droop or low spots.  
Next, make the proper electrical connections for the application. See  
contact ratings on page 1 and schematics on page 4.  
Switch Test (switch models only)  
To test the shutdown and/or alarm functions  
perform the following:  
NOTE: If the drain plug on the crankcase  
is used for the connection, we  
1. Unscrew protective boot from test knob.  
IMPORTANT: Always replace boot after  
testing.  
recommend installation of a tee to  
allow draining of the crankcase  
for service.  
Oil Inlet  
Hose  
Vent  
Hose  
2. Turn the test knob 1/4 turn to the right  
(clockwise), for low test indication (Figure 6).  
Viewing  
Lens  
Running  
Engine  
Crankcase  
3. Install the 1/2 inch (13 mm)  
I.D. x 3 ft. (914 mm) hose to  
the vent connection on the  
LM300 to the vent connection  
on the crankcase. See Figure 4.  
The vent connection on the  
Figure 6  
3. Turn the knob 1/4 turn to the left  
(counterclockwise), for high test indication. DO NOT FORCE  
THE TEST KNOB TO TURN.  
Oil Level  
NOTE: After the engine shuts down, you will notice that the oil in the  
sight gauge glass will rise above normal running level, possibly  
showing an overfill condition. This is a result of “drain-back” to the  
engine crankcase and it is normal. Therefore, on models LM302 and  
LM303 it may be necessary to wire the high level shutdowns into a  
class “B” or “C” (bypass until first time safe) lockout, so as to allow a  
permissive start. After the engine is re-started the level will pull down  
to the normal running level and the shutdown features will be active. A  
modulating valve (Thumb-Valve) in the level maintaining models  
will allow oil usage to be made-up continuously during operation.  
Monitoring Hose  
crankcase must be well above the  
regulated oil level. All hoses must  
be clear of obstructions.  
Figure 4  
BEFORE CONTINUING, VERIFY THAT ALL HOSE CLAMPS  
ARE TIGHT.  
LM-92164N page 3 of 4  
 
SWITCH WIRING DIAGRAMS  
WARNING:DISCONNECT ALL ELECTRICAL POWER BEFORE CONNECTING ANY WIRES.  
LM305  
Alarm before  
shutdown N.C.  
DPST  
LM301  
LM302  
High/Low N.O.  
DPST  
LM303  
High/Low N.C.  
DPST  
LM304  
Alarm before  
shutdown N.O.  
DPST  
SPDT  
Green  
Black  
Green  
Black  
Green  
Green  
Green  
Brown  
Normal  
Low  
High  
High  
Normal  
Normal  
Low  
Yellow  
Normal  
Low  
Normal  
Red  
Brown  
Black  
Low-Low  
Low-Low  
Low  
Low  
High  
Normal  
High  
Normal  
Low  
Float  
Yellow  
Blue  
Blue  
Yellow  
Orange  
Normal Orange  
Normal  
Low  
Red  
Red  
Low  
Low-Low  
Low  
Low-Low  
Float  
Float  
Float  
Float  
OPERATING RANGES OF SWITCHES  
This section applies only to models that have built-in switches. The illustrations  
below and to the right show the dials and their operating ranges of the switches.  
If levels are within the designated zones the switch(es) will activate. Notice that  
a switch is capable of activating approximately 3/8 in. (10 mm) from the top of  
the high zone and 3/8 in. (10 mm) from the bottom of the low zone. The dial in  
Figure 9 shows that if level continues to drop into the low-low zone, a  
shutdown will occur.  
3/8 in.  
(10 mm)  
High Zone  
3/4 in.  
Shutdown or Alarm  
(19 mm)  
Normal  
Operating Range  
3/4 in.  
(19 mm)  
Low Zone  
Shutdown or Alarm  
NOTE: Color zones on dial face show approximate normal operating zones.  
Actual conditions may vary depending upon operating characteristics of the  
engine. Placement of the LM300 according to the above instructions will  
compensate for these conditions.  
3/8 in.  
(10 mm)  
Figure 8: LM302/LM303  
Normal  
Normal  
Operating Range  
Operating Range  
3/4 in.  
(19 mm)  
3/4 in.  
(19 mm)  
Low Zone Alarm  
Low-Low Zone Shutdown  
Low Zone  
Shutdown or Alarm  
3/8 in.  
1/4 in.  
3/8 in.  
(10 mm)  
(10 mm) (6 mm)  
Figure 7: LM301  
Figure 9: LM304/LM305  
Warranty  
A limited warranty on materials and workmanship is given with this FW Murphy product.  
CONTROL SYSTEMS & SERVICES DIVISION  
P.O. Box 1819; Rosenberg, Texas 77471; USA  
+1 281 633 4500 fax +1 281 633 4588  
FRANK W. MURPHY, LTD.  
MACQUARRIE CORPORATION  
1620 Hume Highway  
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.  
+44 1722 410055 fax +44 1722 410088  
Campbellfield, Vic 3061; Australia  
+61 3 9358 5555 fax +61 3 9358 5558  
FW Murphy  
P.O. Box 470248  
MURPHY DE MEXICO, S.A. DE C.V.  
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje  
San Luis Potosí, S.L.P.; México 78384  
+52 444 8206264 fax +52 444 8206336  
Villahermosa Office +52 993 3162117  
MURPHY SWITCH OF CALIFORNIA  
41343 12th Street West  
Palmdale, California 93551-1442; USA  
+1 661 272 4700 fax +1 661 947 7570  
Tulsa, Oklahoma 74147 USA  
+1 918 317 4100  
fax +1 918 317 4266  
USA–ISO 9001:2000 FM 28221  
UK–ISO 9001:2000 FM 29422  
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.  
Printed in U.S.A.  
LM-92164N page 4 of 4  
 

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