18
5 Unit varies from
normal temperature
to cold during use.
6 Pressure relief
device has operated
(water ejected from
PRD tube).
7 False Activation
5.1 Water pressure has
dropped below minimum
required
6.1 Blocked sprayhead.
7.1 Direct Sunlight
7.2 High reflective
clothing
5.1.1 Wait until the water pressure resumes to
normal.
6.1.1 Clean or replace blocked spray rings in
the sprayhead and then fit new PRD.
Note: Identify cause of operation before
fitting new PRD unit.
When fitting a new PRD, follow the
commissioning procedure.
7.1.1 See page 8 - Siting of the Unit, eliminate
direct sunlight from the IR sensor.
7.2.1 limit the highly reflective clothing to the
unit. Infrared sensors are sensitive to highly
reflective clothing.
FAULT FINDING
Problem
Cause
Action