Murphy Connecting the LLS and LLSB Series, Connecting the LLSR and LLSRB Series, Schematic

INSTALLING THE LLS SERIES PRESSURE SWITCH

WARNING: PERFORM THE INSTALLATION WITH POWER SOURCE “OFF”. NEVER EXCEED RATED PRESSURE RANGE FOR THE UNIT. USE WRENCH ON SHANK TO TIGHTEN/LOOSEN CONNECTIONS. DO NOT TWIST THE ENCLOSURE WHEN SCREWING THE LLS INTO THE PROCESS – THIS WILL DAMAGE INTERNAL COMPONENTS, FILLED MECHANISM AND THE SEALS. DO NOT OVERTIGHTEN THE UNIT.

Connecting the LLS and LLSB Series

To install the LLS and LLSB Series, a vertical mounting is recommended.

1.The unit threads directly into a 2 in. 11-1/2 NPT tee on the lead line.

CAUTION: DO NOT TAMPER WITH OR BREAK SEALED CONNEC-

TIONS. APPLY PIPE SEALANT TO PROCESS CONNECTION THREADS.

2.Tighten the bottom housing to the lead line tee using ONLY the transmitter wrench flats (see figure 1).

3.Check for leakage on any of the connections. Make sure that the installation conforms with local and other applicable codes.

Figure 1	Do NOT Tamper with
Do NOT Tamper with
	these Sealed Connections
This Connection
Wrench Flats

2 in. NPT	Use Wrech Flats to
	Screw the LLS
Lead line tee	Into the Process

Connecting the LLSR and LLSRB Series

For mounting the switch enclosure refer to “ Dimensions” on page 2. The following instructions are based on the usage of a PD8187 Pulsation Dampener option shown in Figure 2 (at right.)

1.Install sensor/pulsation dampener into pressure source connection.

CAUTION: THE PD8187 PULSATION DAMPENER IS NOT INTENDED

AS A SHUTOFF VALVE. APPLY PIPE SEALANT TO THE THREADS.

2.Loosen the eight housing bolts until the bottom housing is free to turn.

CAUTION: WHEN LOOSING THE EIGHT HOUSING BOLTS, MAKE

SURE NOT TO UNSCREW THE GREEN DIAPHRAGM CAPSULE.

3.Tighten the bottom housing to the pulsation dampener connection.

4.Tighten the eight housing bolts to 25±3 foot lbs. Stagger the tighten- ing to assure even clamping.

5.Route capillary away from heat source (exhaust manifold). Excess capillary should be carefully coiled and secured (do NOT cut it).

Figure 2

Housing

Bolts

Wrench

Flats

1 in. NPT

Transmitting Tubing (capillary)

Diaphragm

Body

Pulsation Dampener (optional)

Lead Line Tee

WIRING THE LLS SERIES PRESSURE SWITCH

WARNING: PERFORM THE WIRING OPERATION WITH THE POWER SOURCE “OFF”. MAKE SURE VOLTAGE AND CURRENT REQUIRE- MENTS ARE WITHIN THE LLS RATINGS. BEFORE WIRING THE UNIT DETERMINE VOLTAGE AND POLARITY FOR THE APPLICATION.

IF THE UNIT IS USED IN HAZARDOUS AREAS, MAKE THE AREA SAFE BEFORE REMOVING THE SNAP-SWITCH(ES) COVER.

If switch trip point needs to be adjusted, see page 4.

LLS Series Hook-up (all models)

To wire the LLS Series, use proper the electrical conduit.

1.A 3/4''-14 NPT inlet connection for conduit installation is provided at the top end of the switch enclosure (see opposite page– “Dimensions” for location).

Schematic

NC

SPDT C

NO

P P

NC

C

DPDT

NO

NC

C

NO

NOTE: The plastic plug (supplied) is to protect the conduit inlet threads and must be removed before wiring the unit.

2.Using a 3/16 in. hex wrench, unscrew the 4 hex-cap screws.

Now proceed to remove the square cover to reveal snap-switch(es).

3.To wire the unit, refer to the typical wiring drawing (Figure 3) and to the Schematic (shown at right). Wire the LLS Series switch(es) with 60°/75°C (140°/167°F) insulated wire.

4.A terminal (inside the switch enclosure) is provided for case or equipment grounding, refer to Figure 3 for location.

5.After completing wiring, replace the switch cover and make sure it is tightly secured before applying power to the system.

Figure 3

	Customer
SPDT	Wiring	DPDT
	3/4 in.-14 NPT
	Conduit Inlet
N.O. N.C. COM.	Provision for
	Case Ground	NC NO C NC NO C
	Terminal
	Block(s)

3