Martin Pro Compact Sicherheits- Und Installationshandbuch Seite 75

Pressure relief valve
A valve with a gas-permeable membrane between the power and data cable glands on the back of the
fixture (see 'Fixture overview' on page 28) equalizes pressure by allowing air to pass through it when
the fixture heats up and cools down, but at the same time it acts as a barrier to water in liquid form.
The expulsion of warm air (with a slightly higher water vapor content) and intake of cool air (with a
slightly lower water vapor content) prevents humidity buildup over time provided that the valve works
correctly and that the fixture is correctly sealed.
Pressure relief valves become blocked over time as the micropores in their membranes fill with
particles. If a valve becomes blocked by dirt or water, excess pressure can damage seals or cause air
and even water to be sucked into the fixture along cables. Valves cannot be cleaned and must be
replaced if they show any signs of contamination or if they are not in perfect condition.
To obtain the maximum service life from your fixture, follow these guidelines:
• Do not allow water to collect on or near the pressure relief valve. Do not install a fixture with the
valve membrane horizontal so that water can pool on it.
• Replace the valve with a new item if it shows any signs of contamination or is not in perfect
condition.
• Replace the valve after an extended period of use. Intervals for valve replacement depend on the
installation environment.
• Consult your Martin dealer about a suitable valve replacement schedule.
• Contact Martin Service if a valve requires replacement
Installing a glare shield accessory
To install the glare shield that is available as an optional accessory from
Martin, see photo on right. Hold the glare shield up to the front of the
fixture and fasten it in position using the four supplied screws.
Opening and closing the fixture
To open the fixture for access to the effects:
1. Open the fixture in dry
conditions only.
2. Shut down power to
the fixture and make
sure that it cannot be
reapplied during
service work.
3. See illustration on right.
Remove the four Allen
(hex) screws (arrowed)
from the effects
compartment cover
and let the cover hang
on its safety wire.
Exterior Projection Pro Compact Safety and Installation Manual 75