Emerson MRLDS Specifications download pdf (Page 8)

2 • MRLDS I&O Manual 026-1307 Rev 4 28-JUN-2011

2Choosing a

Mounting Location

Proper location of the refrigerant sensor is necessary to

ensure accurate measurement of representative air sam-

ples.

Mount the sensor:

• Indoors, inside a room area where air circulates

freely.

• On a flat, interior surface.

• Approximately 12-18 inches (30-45 cm) from

the floor.

Do not

mount the sensor:

• On surfaces in unheated areas (less than

0°C),

unless using a model with a de-icer.*

• Near heat sources, such as appliances, direct

sunlight, or concealed pipes or chimneys.

• On walls subject to excessive vibration.

• In the direct path of an exhaust fan. Excessive

air movement will disperse gas before it can be

detected. If mounting in the path of excessive

airflow cannot be avoided, it will be necessary

to turn OFF air circulation for 1/4 to 1/2 hour,

4-6 times a day.

2.1 Mounting The Sensor

The refrigeration monitor comprises two basic parts:

the base and the cover. The cover incorporates the circuit

board with the sensing elements.

1. Fasten the base to a junction box or other support.

The base has a number of openings to allow for

mounting to various junction boxes.

2. Feed the power and signal wires through the rect-

angular opening in the base (Figure 1-1).

3. Connect the wires to the terminal connector

located in the base, as indicated in Figure 5-2

and Figure 4-2.

4. The Modbus MRLDS must be connected to earth

ground. Connect earth ground to the MRLDS

ground terminal labeled . Connect to earth

ground with 14 AWG wire that is less than 6

inches.

5. Align the two side tabs of the cover with the base

and snap the cover onto the base.

6. Verify the cover is securely attached to the base

by pulling on the top and bottom of the cover as

shown in Figure 2-2.

Figure 1-2

- Powering Multiple MRLDS Units

NOTE: For example, if mounted inside a motor

room, exhaust fans must be shut off during the

intervals that air samples will be tested for

refrigerant levels.

120VAC

24VAC

ACN

MRLDS I

MRLDS II

If a transformer is

shared between MRLDS

units, the “ACN” of each

MRLDS must be

wired to the same phase

of the transformer.

Figure 2-1 - Sensor Base And Cover

NOTE: To remove the cover, grasp it along the

recesses and pull it away from the base (Figure

2-2). Alternatively, place a screwdriver into the

slots indicated in Figure 2-2 and twist.

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Emerson MRLDS Specifications Page 8

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