Wilhelmsen HFC User manual

REFRIGERANT LEAK MONITOR KIT 6CH
Installation & Service guide for
HFC/HFO gas detectors
in marine applications

Installation & Service guide for HFC/HFO gas detectors in marine applications
2
Refrigerant leak monitor kit 6 channels
Table of Contents
1. FEATURES ............................................................................................................................................... 3
2. WIRING DIAGRAMS ............................................................................................................................... 5
3. FUNCTION ............................................................................................................................................... 8
4.1 AUTO/MANUAL ALARM RESET ............................................................................................................ 9
4.2 ALARM TIME DELAY (T1) ....................................................................................................................... 9
4.3 RESET/TEST/SERVICE-BUTTON ( 7) ............................................................................................. 9
4.3.1 TEST MODE ........................................................................................................................................ 9
4.3.2 SERVICE MODE ................................................................................................................................... 9
4.3.3 FAULT MODE ..................................................................................................................................... 9
4.4 INTERNAL BUZZER AND 24VDC AUXILIARY OUTPUT .................................................................. 10
4.5 REMOTE DETECTORS ........................................................................................................................... 10
5 LOCATION/INSTALLATION ................................................................................................................ 11
5.1 ALARM LEVELS / CHANGING ALARM LEVELS ........................................................................ 12
5.2 FUNCTION CONTROL ..................................................................................................................... 13
6 TROUBLESHOOTING ........................................................................................................................... 14
When we are troubleshooting, we recommend checking these following steps ............................... 14
7 CLAIM/WARRANTY PROCEDURE .................................................................................................... 15
8 APPENDIX 1 .......................................................................................................................................... 16

Installation & Service guide for HFC/HFO gas detectors in marine applications
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1. FEATURES
The refrigerant Leak Monitor Kit 6CH offer an ideal solution for multipoint surveillance of
machinery room and walk-in freezer rooms where refrigerant gases may be present. The kit is
supplied with
- 1 x Monitoring Unit MPU6C
- 4 x Detector New MP-DS-HFC-4000 (product number: 708042)
- 1 x Red combined flash / siren FL-RL-R
- 2 x 100m halogen free cable 3x0.75mm2
Fig. 1
Functional diagram

Installation & Service guide for HFC/HFO gas detectors in marine applications
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 The monitoring unit MPU6C can be connected to up to 6 detectors. It can display
operating status and alarm information independently for each channel via LEDs. They are
suitable for monitoring all HFC and HFO refrigerants.
 The 4 x New MP-DS-HFC-4000 detectors are equipped with the new SEN027 Self Sense
sensor. Additional 2 detectors can be purchased separately to fully utilize all channels in
MPU6C if required. Once connected, they will continuously measure the gas concentration
and provides an analogue signal to the central unit.
Other features include:
- User configurable Alarm time delays.
- Manual/auto alarm reset for each channel
- Built-in service function and self-test program
- Four alarm relays with 230 volts rated SPDT contacts
- Failsafe relay operation on power loss
- Audible alarm
Please Note!
MPU6 is normally supplied with default set alarm thresholds. These must be
verified or reset during commissioning. Alarm levels must always be set on
each channel for proper gas and detector type!
Default settings from factory:
- Factory gas specific pre-calibration can be delivered upon request. Must be
specified when ordering.
Alarm levels, factory settings are:
HFC, HFO, HCFC (ppm) C=100 B=1000 A=2000
Alarm level Offset
Alarm C 1,0V
Alarm B 2,0V
Alarm A 3,0V

Installation & Service guide for HFC/HFO gas detectors in marine applications
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2. WIRING DIAGRAMS

Installation & Service guideline for HFC/HFO gas detectors in marine
applications
6

Installation & Service guideline for HFC/HFO gas detectors in marine
applications
7
Fig. 2-4
Wiring diagrams

Installation & Service guideline for HFC/HFO gas detectors in marine
applications
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3. FUNCTION
LED A
LED B
LED C
POWER
TEST TERMINAL
A
B
C
RESET/TEST
Fig. 5
Channel settings
After connecting each detector and applying power, the green LED on each channel will flash as
the pre-heat process commences. After approximately 4 minutes the green LED will be illuminated
permanently, and the sensor is fully operational. Each channel has one yellow and two red warning
LEDs. The yellow LED indicates a low-level gas leak (above alarm threshold C) whilst the two red
LEDs indicate gas concentrations above thresholds B and A.
When gas is detected above the respective alarm threshold the appropriate LED’s will flash until
the appropriate time delay has expired when it is permanently illuminated, and the corresponding
relay contacts change state. As the gas concentration subsides the LEDs and relays will return to
their normal state unless the ‘manual reset’ function has been selected. The audible alarm will be
initiated if it is configured with the respective alarm threshold and cannot be muted. Technicians
can however inhibit the alarm by selecting ‘Service Mode’.
Fig. 6
Central unit details
ON
n 1
n 2
n 3 ALARM RESET: ON=AUTO, OFF=MANUELL
n 4 FAULT DELAY: ON=4h DELAY, OFF= NO DELAY
ALARM
A
ALARM
B
ALARM
C
(-)
+ 5VDC
GV OFFSET

Installation & Service guideline for HFC/HFO gas detectors in marine
applications
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4.1 AUTO/MANUAL ALARM RESET
DIP switch (5) no3 on each channel’s control card manages the alarm reset function. “ON” enables
Auto reset and “OFF” enables Manual reset, via depressing “Reset/Test/Service”-button (7).
4.2 ALARM TIME DELAY (T1)
DIP-switch (5) controls the alarm time delay for each channel.
no1 no2
on on No alarm delay
off on 1 minute delay
on off 10 minutes delay
off off 30 minutes delay
4.3 RESET/TEST/SERVICE-BUTTON (7)
Reset/Test/Service-functions is accessible via a pushbutton on the cover.
4.3.1 TEST MODE
By depressing the “Reset/Test/Service”-button (7) on any channel for 5 seconds the test program
is initiated. This sequentially energizes each LED and relay at five second intervals. That the test
program has started is indicated by the fact that all LEDs on chosen channel will go out.
4.3.2 SERVICE MODE
Depressing the” Reset/Test/Service” button (7) for 10 seconds will inhibit all alarm functions for
the chosen channel for a period of 60 minutes. Service mode is indicated by the fact that all LEDs
on the chosen channel are flashing. Whilst in this mode a new 60 minute inhibit period can be
initiated by repeating the process. Normal operation will be automatically resumed after 60 minutes
or can be cancelled by depressing the “Reset/Test/ Service”-button briefly.
4.3.3 FAULT MODE
In the event of a detector failure (GV offset < 0,1V) or disconnection of the interconnecting wiring
a fault condition will be indicated by loss of the green 'Active' LED, the other LEDs start to flash and
the alarm relay D is de-energized. In the event of power failure all relays (A, B, C & D) will be de-
energized. Connections are available for an optional battery back-up to enable total continuity of
operation in the event of a power failure. A 4-hour delay can be configured for relay D to prevent
nuisance alarms. This is activated by setting DIP switch (5) no4 on the respective channel card to
'ON'. The operation of the LEDs will remain unchanged.

Installation & Service guideline for HFC/HFO gas detectors in marine
applications
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4.4 INTERNAL BUZZER AND 24VDC AUXILIARY OUTPUT
The internal buzzer (1) and 24VDC output can be activated by the DIP-switch (4) on the terminal
board and can be user configured to operate from alarm concentration A(no1), B(no2) or C(no3).
Setting the DIP-switch to ON for the respective alarm level, selects the appropriate alarm level.
The 24VDC auxiliary alarm output is always activated together with the buzzer. However, by
removing jumper Bb (3) the buzzer can be disabled.
Please Note!
After being powered off for prolonged periods the sensor may take several
minutes to stabilize during which time ‘false’ alarms may be initiated. Such ‘false’
alarm shall disappear within a few minutes.
4.5 REMOTE DETECTORS
Fig. 7
Sensor connection
The “MP” is a range of detectors special designed for use with the
MPU units.
Detectors are available for different gases, with different
measuring ranges and in different housings to suit the actual
application and environmental requirements. Examples of gases
that are possible to detect are: HFC, HCFC and mixtures.
Other detectors can be connected to MPU unit. Contact us for
further details.
Please Note!
The sensors used in the MP-series have limited selectivity and are therefore not
gas specific. Care should be taken when installing the equipment to minimize any
cross contamination from other gases or vapours.
The cable length between sensor and central unit (MPU) is max 50m.
For further guidance on specific applications contact us.