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PIN No.
1
Power (V1)
Model Name
2
Power (V2)
Mounting Method
3
Mounting Depth
4
Height
5
TCB-LDS1
TCB-LDS2
Width
VRF
VRF
Material
Refrigerant Leak Detector
Refrigerant Leak Detector
Height
mm
85
85
Width
mm
85
85
Depth
mm
32
32
Mounting Screw Pitch
mm
60
60
Weight
kg
0.085
0.085
Plastic
Stainless Steel
White
Stainless Steel
Recessed
Recessed
Yes
Yes
Audible Alarm Sound Level
dB
85 (2300Hz ±300)
85 (2300Hz ±300)
Powered Off
Powered Off
3 x Coloured LED
3 x Coloured LED
Yes (L30)
Yes (L30)
Interconnecting Cable Max Length (Sensor to FCU)
m
10
10
Interconnecting Cable Type (Sensor to FCU)
mm
2
0.75mm
2
Multi Core
0.75mm
2
Multi Core
Interconnecting Cable Max Length (Sensor to LD1)
m
50
50
Interconnecting Cable Type (Sensor to LD1)
mm
2
0.75mm
2
Multi Core
0.75mm
2
Multi Core
12-24V AC/DC
12-24V AC/DC
Suggested Fuse Size
Amps
N/A
N/A
Circuit Protection Fuse supplied With Cable
mA
125 (Fuse supplied as part of Loom)
125 (Fuse supplied as part of Loom)
Yes
Yes
Yes
Yes
Recommended Mounting Height Above floor Level
mm
150 ~ 250
150 ~ 250
Note:
In accordance with BS
EN 378:2016 the leak
detector MUST be
connected to a separate
power supply breaker
than that of the indoor
unit (FCU).
12 > 24v
AC / DC
Relay (NO)
Relay (C)
Relay (NC)
Usage
Colour
Model Name
Model Group
Function
Facia Plate Material
Cable Link For Remote On / OFF (Ving Card)
Fail Safe Relay Operation
Installation Type
Audible Alarm
Alarm Mute
Visual Indicator (Neon)
Fault Code generated to Local Remote Controller
Power Supply
The TCB-LDS1/2 is intended to be mounted within a single gang
back box, wall box. A minimum depth of 45mm is required to suite
all variants.
68.3mm
Metal
Plastic
86mm
47mm
Flush - Dry Lining
46mm
TCB-LDSBB1
68.3mm
86mm
TCB-LDSBB2
Flush - Wall (concrete)
TCB-LDS Product Installation Manual
For Commercial Use
Refrigerants are significantly heavier than air. Therefore in order for the sensor to
operate as effective as possible the refrigerant detector must be positioned at a low
level inside the room, where the indoor air conditioning unit is fitted. See diagram
showing recommend installation guidelines.
The unit is designed to fit on the surface or over a standard single socket recessed
box. The refrigerant detector PCB can be accommodated inside a standard single
gang electrical back box (locally procured). The minimum depth of the back box is
dependent on the style of face plate, however all designs will fit inside a 47mm deep
enclosure , which can be flush mounted into the wall.
Distance
– The detector is to be mounted a maximum of 10m from the indoor unit.
Low Level
– As HFC refrigerants are heavier than air, the TCB-LDS should be
mounted as close as practical to floor level
(150mm ~ 250mm above floor level), preferably
directly below the air conditioning unit.
Accessible for Maintenance -
The TCB-LDS should be mounted in a position where
it can be easily accessed for maintenance and repairs.
Minimize Damage -
Mount the sensor in a position that minimizes the risk of
mechanical damage to the unit.
Minimize false alarms -
Semi-conductor sensors can be ‘poisoned’ by contaminants
and after exposure may take considerable time to recover. Solvent paints and silicon
mastic are typical contaminants and exposure from these substances must be
avoided.
Ensure leaks can be detected –
Do not mount the sensor next to doors or windows,
where fresh air may influence readings.
Sensor Operation Characteristics
Measure the Gv voltage on the testing connector (Pins 1 & 4),
as shown above.
Refer to the table below for the expected voltages.
Installation Location
Electrical Connections
PCB Layout (Front & Rear View)
Sensor Testing
Product Overview
Specification
Mounting Method
The leak detector is designed to shut down the air-conditioner in the event of a discharge of refrigerant into the detected space. In the event of the
leak detector operating there is visual and audible indication. The visual indication is via a flashing LED and the audible indication is via buzzer.
In accordance with BS EN 378:2016 The leak detector MUST be connected too a separate power supply breaker than that of the indoor unit
(FCU). The connection between sensor and indoor unit is completed via CN80 port on the indoor PCB
In the event of a leak the indoor unit will stop and a L30 fault code will be generated. This fault code will be displayed on the local remote controller
and the network based controls connected.
TCB-LDS1
TCB-LDS2
Installtion Height of Sensor from Floor
Typical Hotel Application
Operating
Condition
LED Status
Buzzer
Status
Gv
Volts
Power Status
Fault Code
Operating
Condition
L30
None
Thermal Off
Thermal On
9
Gas
concentration
level drops below
Level 1
(Sensor Reset)
Constant Green
Off
<2.0V DC
Power On
Power Off to On
L30
Thermal Off
8
Level 3
(4000ppm) Gas
Concentration
Level exceeded
(> 30 seconds)
Flashing Red/Amber (4
Hz)
Pulses
(4Hz)
Power On
L30
Thermal Off
>4.2v DC
7
Level 2
(1000ppm) Gas
Concentration
Level exceeded
(> 30 minutes)
Flashing Red/Amber (2
Hz)
Pulses
(2Hz)
>3.5V DC
Power On
None
Thermal On
6
Level 2
(1000ppm) Gas
Concentration
Level exceeded
(> 2 seconds)
Flashing Red (2 Hz)
Off
>3.5V DC
Power On
None
Thermal On
5
Level 1 (500ppm)
Gas
Concentration
Level exceeded
(> 2 seconds)
Flashing Green (2 Hz)
Off
>2.5V DC
Power On
None
Thermal On
4
Sensor Fault
(>180 seconds)
Flashing Red (1Hz) + one
(1) Amber flash per minute
Pulse 1 per
minute
<0.1V DC
Power On
L30
Thermal Off
3
Normal Operation
Constant Green
Off
<2.0V DC
Power On
None
None
2
Warm Up
(5 minutes)
Flashing Green/Red (1Hz)
Off
N/A
Power On
None
Thermal On
1
Power Off
Off
Off
N/A
Power Off
Item No.
LDS1/2 Sensor Status
CN80 Operation Pattern
FCU Status
Relay Status
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
1
3
3
4
5
NO
COM
NC
LDS1/2 Sensor
CN80 (FCU)
Example: LDS2 with LDSBB1
