Bacharach HGM-MZ Istruzioni operative

BACHARACH Inc.

HGM-MZ Multi-Zone Monitor

Annual Maintenance

And Troubleshooting Guide

Service, Testing and Maintenance procedures

HGM-MZ

Routine Annual Maintenance

And Operating Parameter Verification

These maintenance and service items and procedures below will be

referenced in the tech bulletins and operations manual and used by

customer service and technical support technicians when discussing parts

or service of the refrigerant monitor. Using this information allows the

installation technician to quickly identify the service points and make

maintenance measurements and adjustments to the unit quickly and

accurately.

Yearly maintenance is required to assure peak performance and accuracy

of the HGM-MZ multi-zone monitor. If the monitor is installed in areas of

high levels of dust and particulate it is recommended that semi-annual or

quarterly filter changes be made to prevent system faults due to purge or

zone restrictions.

During these maintenance procedures it is a good time to check the

diagnostic screen “DIAG” to verify that the detector voltage and pump

pressures and within optimum parameters. If they are not a voltage

adjustment or scheduled pump replacement could head off a system fault.

To verify monitor operation it is possible to use a bump gas test using

keyboard cleaner (dust destroyer) which is typically R134a purchased at

your local office supply store. If calibration type verification is required we

have “Gas Verification kits available which contain certified PPM levels of

test gas.

Please refer to the Tech Bulletins on the following pages for parts

identification, actual settings and adjustment sequence.

HGM-MZ

Detector voltage and Reference voltage

adjustment.*

*Only If Required

Correcting and adjusting; Fault codes, Gain Set 200, Over

Range 2000, Zero 4000 and Clipping 8000

Figure 1

To correct for codes 200, 2000, 4000 and

8000 – from the front screen on the HGM

MZ select the top left block (under

STATUS) and press enter. This will take

you to the SETUP screen.

To enter service mode:

From the main sampling screen (figure 1) press enter two times that will take you to the SETUP

screen (figure 2) then move the cursor to the Service Mode entry box, then press enter, it will now

say (service mode confirm), press enter again, it will now say, (service mode quit), press enter

again, it will now say (service confirm quit), press enter again and if you did it correctly it will say

(service mode entry) again.

Figure 2

At the setup screen you can view the current conditions by entering the diagnostic

screen “DIAG”. To make changes and adjustments you must first put the monitor in the

SERVICE MODE. Once in service mode select “SYSTEM”.

To access detector voltage and IR

voltage adjustment screen select

SERVICE MODE ENTRY – press

enter twice then select SYSTEM

and press enter.

To enter service mode:

From the main sampling screen (figure 1) press enter two times that will take you to the SETUP

screen (figure 2) then move the cursor to the Service Mode entry box, then press enter, it will now

say (service mode confirm), press enter again, it will now say, (service mode quit), press enter

again, it will now say (service confirm quit), press enter again and if you did it correctly it will say

(service mode entry) again.

In the “SYSTEM SETUP” arrow down to “MORE” and press enter to get to the actual

adjustment screens.

In the “MORE” screen you have access to the “DET DIGIPOT” and “IR DIGIPOT”

voltage adjustments. Select the item you want by highlighting it and hitting enter. To

adjust and use the arrow keys move to it, then press enter which will allow you to see

the voltage and make the adjustments with the up and down arrow keys.

The detector digipot “DET DIGIPOT” voltage range should be between 4.20 to 4.28

VDC with the digipot three digit reference numbers between 120 and 255.

In the SYSTEM SETUP select

MORE and press ENTER to

get to the adjustment screens.

Record the DET DIGIPOT and

IR DIGIPOT readings for

reference.

Highlight DET DIGIPOT and

press enter to view the Digipot

and IR VOLTAGE.

Highlight IR DIGIPOT and

press enter to view the IR

VOLTAGE.

Note - Go into IR DIGIPOT and

verify that the MW is not set outside

the range of 300 to 500 after

adjusting the IR detector voltage IR

DIGIPOT. A typical MW setting for a

sensor with Yellow tape is 325

without the tape it is approx 425.

To adjust the MW use

the up and down arrow

keys on the keypad.

Adjust the Detector Digipot Voltage

Range 4.20 to 4.28 with up and down

Sensor

No Tape

With

Digipot Reference

HGM-MZ Sample pump flow testing

This procedure describes the correct method for testing the sampling pump in order to

determine its proper sample flow and vacuum.

HGM-MZ Pump Testing;

If the HGM- MZ is unable to pull a vacuum it will generally be due to one of two things, either the

pump is not running or failed, or there is a leak in a valve or valve stuck open in the manifold.

Flow detection is based on a minimum drop from ambient pressure and a minimum value above

vacuum, so a vacuum failure will generally result in a NO flow indication on all zones.

The pinch test can isolate the problem quickly. In the diagnostic screen observe the live

pressure "PRES", then pinch the tube on one side of the white disc (Hydrophobic filter) pinching

either side is OK. This will dead head the pump, a good pump will drop the pressure to

approximately 3 psia below the Ambient reading. If you get no change, the pump is not

working, the “EXHAUST” port is restricted, or there is a leak between the pinch point and the

pump.

If the pinch yields a good vacuum number, the problem is before the pinch in the valve

manifolds. One or more manifold valves are either stuck open or a failed valve driver board is

electrically holding it open. (See separate tech Bulletin on Manifold testing procedure)

Pump Pressure (PRES)

Pump Vacuum (VAC)

Ambient Air Pressure (AMB)

Indicates good or bad pump

operation

Enter Diagnostic Screen (DIAG)

From SETUP Screen

HGM-MZ

Major Parts List with Part Numbers

Sampling Pump with

Connector 3015-5176

Rabbit Processor

Board

Hydrophobic Filter

07-1650

Battery

0204-

0020

Infrared Bench Replacement

Kit 3015-4572

Power Supply Board

3015-5149

Power

Entry

Board w

Fuse

Manifold Control Board

3015-5095

Main

Processor

Board

(Motherboar

Replaceme

nt Fuses

(2)

0004-2620

Manifold Block w/ Purge

3015-5080

4 port manifold (not shown)

3015-5072

Plug in points for

optional dual 4-20

communications board

10 pin Ribbon

cable

3015-4258

12 pin

Ribbon

cable

Note: this sensor is

shown without the

YELLOW TAPE around

Inside Cover View

Filters

3015-3125 Charcoal Filter Assembly with Fittings

3015-5931 Display PC

Board and Keypad PC

Board Kit

(With interconnecting

Ribbon Cable)

3015-5182 Ribbon Cable - Main

PCB to Keypad Board

Figure 1

07-1650

Hydrophobic Filter

Figure 2

3015-2906

Line end filter only

Figure 3

3015-3420

Line End Filter Assembly

Figure 4

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