Project Fire Solutions

Gemini FAQs

1. What is the distance between the two sprinkler heads on each Gemini unit?
130 mm

2. What is the RTI of the Gemini sprinkler head?
The Gemini is fitted with fast response, LPCB & VdS approved sprinkler heads with 3 mm bulbs and the RTI of less than 50.

3. What is the approved spacing for the Gemini sprinklers?
VDS approved 9 m² spacing.

4. What is the maximum number of sprinkler heads that can be installed in one area?
There are no specified limits, except those outlined by LPC standards.

5. How is the alarm wiring installed?
Each Gemini unit is provided with a lead and plug that can be used to inter-connect Gemini sprinkler heads together.

6. How is the alarm received?
Gemini is provided with a factory supplied alarm panel which can be located conveniently in the area of protection.

The alarm panel can provide an audible and visible alarm.

7. Can Gemini be installed in false ceilings?
Yes. Gemini can be supplied with purpose designed two-piece rosettes.

8. In the event of accidental operation, can one sprinkler head be replaced on-site?
No. On activation, the whole Gemini unit must be replaced. Gemini is only approved when the unit has been fully assembled within the factory.

9. What is the recommended procedure for replacing a Gemini sprinkler unit?
It is recommended to have one additional Gemini sprinkler unit on site with the normal sprinkler spare box.

10. How do I install a Gemini sprinkler unit?
Gemini is connected to a wet-pipe sprinkler system in the same manner that a false-ceiling ‘second-fit’ sprinkler drop pipe is installed (i.e. using standard threaded connections).

Gemini sprinkler heads can be inter-connected electronically by simply plugging in the inter-connect wires between sprinkler units to form a loop between all Gemini sprinklers.

With the monitoring box inter-connected, an electrician can install the monitoring box in the area of protection using the dedicated 3 amp spur-box provided.

11. What on going maintenance is associated with the Gemini?
There is no need for routine maintenance on the mechanical mechanism on the Gemini sprinkler head. The electrical alarm signal can be tested by breaking the circuit i.e. Unplugging one of the monitoring connections, however the approval does not stipulate such routine testing.