Table of Contents
Advertisement
Merlin CT1250
Gas Interlock System
Mains Supply
2.3
A 240-volt mains electrical supply should be supplied to the panel. This should be
externally fused at 3 Amps using a fused spur.
Gas Solenoid Valve
2.4
The gas solenoid valve should be powered using a 240-volt supply to the terminals on the
Merlin CT1250.
Building Management Systems
2.5
Terminal connections are available on the circuit board for connections to Building
Management systems etc. These are volt free connections marked normally closed
[N/C], common [COM] & normally open [N/O].
Remote Emergency Shut Off Buttons
2.6
These connections are linked out as a factory setting. Remote emergency shut-off
buttons should be volt free and wired to the Merlin CT1250 using two-core cable.
Air Pressure Differential Switches
2.7
These terminals are linked out as a factory setting. Wiring to the air pd switches should be
made using two-core volt free connections.
[SUPP FAN] = Supply Fan & [EXTR FAN] = Extract Fan
If only one fan is being used the terminal not in use should be left linked out. See 2.9.1
Service Mode
2.8
The service dip switch inside the Merlin CT1250 can be used to allow the gas valve to
remain open for 4 hours without the fans running on each activation of the key.
Current Monitor
2.9
There are two terminals, one marked [SUPP FAN LIVE] the other marked [EXTR FAN LIVE]. If
you are monitoring the fan by measuring electrical current going to the fan these
terminals should be used. The live feed from the fan controller should be taken to the
Merlin CT1250 and connected to either the supply or extract side depending on which
fan/s are being monitored. MAX 20 AMPS.
Potentiometers
2.9.1
[SUPP FAN LIVE] = [SENS1] Potentiometer
[EXTR FAN LIVE] = [SENS2] Potentiometer
The fan/s should be run at the minimum required speed and the relevant potentiometer
turned slowly clockwise until the green LED on the circuit board
the panel has detected the electrical current going to the fan.
IMPORTANT!
If both supply and extract fans are being monitored both links of [FAN PD SWITCHES] (5)
should be removed. If only one fan is being monitored the relevant link should be taken
out of this terminal connection
Internal Buzzer
2.10
Operates at 65dB measured 30cm from closed panel.
Use a screened cable to avoid electrical interference in LOW VOLTAGE connections
Rev: 06 Date: 07-08-18
(1)
[LNE POWER IN]
(2)
[LNE TO VALVE]
(3)
(6)
(7)
[SUPP FAN LIVE] & [EXTR FAN LIVE]
(8)
[SENS1] & [SENS2]
(5).
[TO BMS]
(4)
[EM REM]
(5)
[FAN PD SWITCHES]
(DO NOT OVERTURN)
(DO NOT OVERTURN)
Product Data Sheet
(9)
lights up. This indicates
4
Advertisement
Table of Contents
