Bms Integration; Fire Alarm Integration; Gas Fill & Prove Time; Gas Proving Enable/ Disable - S&S Northern Merlin CT1750 User Manual

Merlin CT1750
3.3

BMS integration

The Merlin CT1750 can be integrated with a BMS to make or break a circuit on gas on/gas off,
(valve open or valve closed). This will tell the BMS whether or not power is being sent to the
solenoid.
There is a dip-switch located on the inside facia of the Merlin CT1750
labelled [BMS SEL]. This is factory set to OFF which signals the BMS on gas
on/gas off.
When switched ON, the CT1750 will only signal the BMS on a fault, i.e. fan
fault, CO2 high level detected, gas detected, EM Stop pressed, etc.
3.4

Fire alarm integration

The Merlin CT1750 can be integrated with a fire alarm to close the gas supply automatically in
the event of a fire.
There are 2 dip-switches located on the inside facia of the CT1750
labelled Fan 1 & Fan 2 [FP SEL].
They are factory set to OFF which instructs the system to shut down the
fan/s and gas supply on detection of the fire.
On installation, these switches can be switched ON. This will instruct the
system to leave the relevant fan on and only shut off the gas supply
when fire detected.
3.5 Gas Fill & Prove Time
Gas fill and prove times are adjustable.
There are dip-switches located on the inside detailed [FILL TIME] and [PROVE TIME].
They are factory set in the OFF position.
Fill and prove time can be changed by turning the relevant dip switch to on position.
Fill time: OFF – 5 seconds, ON – 10 seconds
Prove time: OFF – 30 seconds, ON – 50 seconds
Once the settings have been changed please remove power from the
fuse spur for 10 seconds.
Fill time is the amount of time the gas valve is open to fill the gas line.
Prove time is the amount of time the system tests the gas line for any
leaks.
3.6

Gas Proving Enable/ Disable

The Merlin CT1750 has a built in gas pressure proving feature.
There is a switch located on the inside fascia detailed [PROVE DIS]. See switch picture above.
This is factory set to OFF (proving enabled). If you do not require gas pressure proving this can
be disabled by turning switch to ON.
Rev: 07 05-19
User Guide
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