Macurco DMK-1 Manuel utilisateur

IMPORTANT: Keep these user instructions for reference.

Macurco™ DMK-1

Duct Mount Kit

Installation Guide

DMK-1 Installation Guide 
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1General Safety Information......................................................................................................................................3 
1.1 Warnings ...........................................................................................................................................................3 
2Application................................................................................................................................................................4 
2.1 Features.............................................................................................................................................................4 
2.2 Specifications.....................................................................................................................................................4 
3Installation Instructions............................................................................................................................................5 
3.1 Location.............................................................................................................................................................5 
3.2 Assembly Instructions .......................................................................................................................................5 
3.3 Installation.........................................................................................................................................................7 
3.4 Pressure Differential Testing .............................................................................................................................8 
3.5 Mounting the Detector .....................................................................................................................................9 
4Maintenance...........................................................................................................................................................10 
5Appendix .................................................................................................................................................................11 
6Macurco Gas Detection Product limited warranty ...............................................................................................12 
 

DMK-1 Installation Guide

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1General Safety Information

1.1 Warnings

WARNING

Each person using this equipment must read and understand the information in this

user manual before use. Use of this equipment by untrained or unqualified persons or

use that is not in accordance with this user manual, may adversely affect product

performance.

Use only for monitoring the gas which the sensor and monitor is designed to detect.

Failure to do so may result in exposures to gases not detectable and cause serious

injury or death. For proper use, see supervisor or user manual, or contact Technical

Support at 1-844-325-3050.

This detector helps monitor for the presence and concentration level of a certain

specified airborne gas. Misuse may produce an inaccurate reading, which means that

higher levels of the gas being monitored may be present and could result in

overexposure and cause serious injury or death. For proper use, see supervisor or User

manual, or contact Technical Support at 1-844-325-3050.

The DMK-1 is specifically designed for use with Macurco gas detectors. After the DMK-

1 is installed and tested, refer to the appropriate Macurco gas detectors User manual

for installing and testing the detector to be installed. For additional support, contact

Technical Support at 1-844-325-3050.

During installation, a Pressure Differential test must be performed on the DMK-1 to

ensure proper installation and function of the device.

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2Application

The Macurco DMK-1 is an air tight enclosure that provides a means to mount any Macurco gas detector to an air

duct. By duct mounting a Macurco gas detector it can monitor the air inside of the duct and provide early detection

of carbon monoxide or other gases moving through the HVAC system. The DMK-1 used with Macurco gas detectors

can provide automatic control to prevent recirculation of these gases into additional areas by the air handling

systems, fans and blowers in commercial and residential applications.

2.1 Features

•Provides detection and monitoring of gas concentrations in ventilation ducts

•Clear cover allows view of detector, displays and status lights

•PC –Polycarbonate housing

•Injection Molding Grade, Flame Retardant, UV Stabilized

Included with the DMK-1

•Enclosure with cover, gasket and screws

•Standoffs - hex aluminum

•Machine screws - Phillips head

•Strain relief/seal for wiring exit hole

•Nut for strain relief

•Sheet metal mounting screws

•Foam compression seals

•A full-size drill hole position template

Not included with the DMK-1

•Macurco Gas Detector

•Input sampling tube: available in various lengths from HVAC and Security distributors

•Single gang type detectors, CM-E1 and GD-2B, will need a 4” single gang mud-ring

2.2 Specifications

•Size: 6 1/4 x 6 1/4 x 3 1/2 inches (15.9 x 15.9 x 8.9 cm)

•Exhaust Tube: EMT, 1/2” (1.3 cm) diameter 6 1/2” length (16.5 cm)

•Setscrew Adapters: EMT, 1/2” (1.3 cm)

•Shipping Weight: 1.5 pounds (0.68 kg)

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3Installation Instructions

3.1 Location

The DMK-1 and gas detector should be mounted on air ducts downstream from any duct openings, deflection plates,

sharp bends or branch connections. If it is not physically possible to locate the detector accordingly, it is best

positioned as far from the opening, bend or deflection plates as possible. Supply duct gas detector installation

should be downstream of fans, filters, chillers, heaters and humidifiers. Return duct gas detectors should be located

at return air opening within the compartment, where the air exits each compartment or in the duct system before

air enters the return air system common to more than one compartment.

3.2 Assembly Instructions

3.2.1 Remove the clear cover from the enclosure and remove the contents.

3.2.2 Insert conduit setscrew adapters into the two large holes in the back of the enclosure. Install the nuts for

setscrew adapters inside the enclosure and tighten.

3.2.3 Insert four (4) machine screws through the back of enclosure. Secure them with the four (4) standoffs inside

the enclosure and tighten.

3.2.4 Insert the Strain Relief/Seal into the remaining large hole on the bottom of the enclosure. Install the nut for

strain relief/seal inside the enclosure and tighten

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3.2.5 Remove the adhesive cover on one side of foam seals. Place them over the conduit setscrew adapters on

the outside of the enclosure as pictured.

3.2.6 Install the exhaust tube into the “downstream” setscrew adapter with the open end of the 45-degree cut

facing downstream.

3.2.7 Install the appropriately sized sampling tube (not provided) into the “upstream” setscrew adapter with the

ports facing upstream.

Important:

•The sampling tube MUST extend at least 2/3 into the width of the duct.

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•The end of the sampling tube that is in the duct must be closed or capped to ensure appropriate air flow

through the DMK-1 and to the detector.

•Tube support is required in all instances where the tube length is greater than three feet.

•The sampling and exhaust tubes must be installed in the proper orientation to ensure appropriate air flow

through the DMK-1 and to the detector.

3.3 Installation

3.3.1 Place the enclosed template on the duct at the desired mounting spot. Mark the six (6) holes to be drilled.

3.3.2 Drill two (2) large and four (4) small holes in the duct you want to mount the unit on using the template

provided. The two large holes (1 ½”) are for the sampling and exhaust tubes. The four small holes (1/16”)

are starter holes for the sheet metal mounting screws. Ensure that the intake and exhaust tube holes are

large enough to allow all the setscrew adapters to fit.

3.3.3 Place each of the four (4) sheet metal mounting screws in one of the shouldered holes at the corners of the

enclosure base.

3.3.4 Place the enclosure onto the duct to test for proper hole alignment. Place the unit against the duct in its

intended position.

3.3.5 Fasten the enclosure to the duct by installing the four (4) sheet metal screws.

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3.4 Pressure Differential Testing

WARNING

A pressure differential test is required to ensure proper operation of the DMK-1. This

test requires the use of an Analog or Digital Manometer. The differential pressure

should measure at least 0.01 inches of water and no more than 1.11 inches of water.

3.4.1 Follow the manometer instruction manual for proper setup

3.4.2 Verify and note the current manometer reading and adjust if necessary

3.4.3 With the DMK-1 cover removed, plug the manometer, positive (+) end or HIGH end into the sampling tube

end and the Negative (-) or LOW end into the exhaust tube end

3.4.4 To verify sufficient pressure differential, turn the air handler on and use the manometer to measure the

differential pressure between the two sampling tubes. The differential pressure should measure at least

0.01 inches of water and no more than 1.11 inches of water.

Check the following if the differential pressure measurements are outside of the specified range:

•Ensure that the air velocity in the duct is within the specified range. If necessary, use a velocity meter to

check the air velocity in the duct.

•Verify the sampling tube is installed with the air inlet holes facing into the airflow. Note that the

sampling tube and exhaust tube can be mounted in either housing connection if the exhaust tube is

mounted downstream from the sampling tube.

•Verify that the end cap is installed at the end of the sampling tube.

•Verify that the sampling tube extends to a minimum of 2/3 duct width.

•Verify that the DMK-1 is properly sealed to the duct.

Negative (-)

or LOW

Positive (+)

or HIGH

Negative (-)

Positive (+)

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3.5 Mounting the Detector

3.5.1 Run the wiring through the strain relief. Twist the outer cap of the strain relief clockwise to compress the

gasket material around the wiring.

3.5.2 Connect the wiring according to the instructions provided for the detector.

3.5.3 Install the gas detector onto the top of the four (4) standoffs. Secure it in place using the four (4) remaining

machine screws.

Important:

•Be sure that there is a good seal between the DMK-1 and the duct surface around the sampling and exhaust

tubes to ensure appropriate air flow through the DMK-1 and to the detector.

3.5.4 Test the installed detector as described in the detector’s User Manual.

3.5.5 Replace the cover and tighten the cover screws.

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4Maintenance

The Macurco DMK-1 requires minimal maintenance. Ensure that the vented sampling inlets remain unobstructed

and is free of debris to maintain good air flow through the enclosure. Please refer to the specific detector User

Instructions for maintenance requirements, installation information and warnings.

4.1.1 Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap. Use a

vacuum cleaner with soft brush to remove dust or contamination under the cover and to clean the vented

sampling inlets.

WARNING

Do not blow out the sensor with compressed air. Using compressed air may damage

the sensor causing the sensor to not respond to the target gas.

WARNING

High voltage terminals (120/240 VAC) are located within the Macurco 12 series

detectors, presenting a hazard to service technicians. Only qualified technicians should

open the detector case and service the internal circuits. Ensure power is de-energized

from the detector relays prior to servicing the unit. Failure to do so may result in

electrical shock.

CAUTION

Avoid using caustic, abrasive cleaners and other organic solvents. These materials may

scratch surfaces and permanently damage the display window, labels, sensor or

instrument case.

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