DencoHappel ZGF.1E series Operation Manual page 143

Flex-Geko Fan Coil Unit
Fault
Unit does not cool/cools
insufficiently (chilled
water)
Water leakage around
unit
PR-2011-0115-GB • Subject to modifications • R4-12/2015
Possible Cause
Water flow rate too low
Very high setpoint temperature set on
control panel/miniature switch
Control panel/miniature switch is fitted
in cold air flow, e.g. adjacent to door
Control valve fails to open
Drain/outlet of main drain pan is
clogged
Drainage/outlet of lateral wall or ceiling
drain pan clogged
Chilled water lines not (correctly) insu-
lated
Unit not positioned horizontally
Leaking heat exchanger or hydraulic
connections
Safety and User Instructions
Action/remedy
Check pump capacity
(technical personnel only)
Check pipe run balance and adjust us-
ing calculated pressure drop
(technical personnel only)
Decrease setpoint temperature on con-
trol panel/miniature switch
Place control panel/miniature switch or
sensor in proper position (technical per-
sonnel only)
Replace faulty control valve (technical
personnel only)
Clean main drain pan and condensate
drain
Clean condensate drain and check for
sufficient pitch, then clean and fill trap
(completed by technical personal if nec-
essary)
Insulate chilled water lines
(technical personal, if required)
Align the unit and position it horizontally
(technical personnel only)
Check heat exchanger, vent and valve
connections for leak-free state
If necessary, re-tighten connections,
clean screw insert or reseal connec-
tions
On valves, check screw connections for
ease of movement, clean sealing sur-
faces and replace seals, if necessary
(technical personnel only)
Check soldered joints between collector
and heat exchanger tubes and on heat
exchanger deflection bends for leaks; if
any leaks found, replace heat exchang-
er (technical personnel only)
143