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Normal operation
and periodic
maintenance
Failure to do this may result in
significant property damage and
void the manufacturer's warranty.
The manufacturer will not be
responsible for any consequential
damages due to water.
Replacement parts
Factory replacement parts
should be used wherever
possible to maintain unit
performance, it's normal
operating characteristics and its
safety testing agency listings.
Replacement parts may
be purchased through the
local Zehnder Rittling sales
representative.
Troubleshooting
Troubleshooting water control unit (room too hot or cold)
System on cooling
System on heating
30
Periodic checks of the drain (where
applicable) should be made during
the cooling season to maintain a
free-flowing condensate.
Should the growth of algae and/or
bacteria be a concern, consult an
air-conditioning and refrigeration
supply company familiar with local
conditions for chemicals or other
solutions available to control these
substances.
Contact the local sales
representative or factory before
attempting any unit modifications.
Any modifications not authorized by
the factory could result in personnel
injury, damage to the unit, and will
void the manufacturer's warranty.
When ordering parts, the following
information should be supplied to
ensure proper part identification:
Complete unit model number
n
n
Unit serial number
n
n
Complete part description
n
n
including any identifying numbers
on the part
Possible Cause
Incorrect thermostat setting
Defective controls
Unit operating at other design conditions
Incorrect thermostat setting
Defective controls
Unit operating at other design conditions
Foreign object in unit
Vacuum unit to remove debris
dropped through discharge grille.
Controls
Refer to control manufacturer's
instructions for maintenance of
field-supplied room thermostat
and water control valve.
On warranty replacements, it
is often necessary to return the
faulty component to receive
credit. Contact the local sales
representative who will get
authorization from the factory
including an RGA (returned
goods authorization) to be used
when sending components back
for inspection. Any returned
components sent back to the
factory without the proper
RGA attached will cancel any
outstanding credit.
Remedy
Room too cold - move thermostat knob to warmer position
until control valve closes. Room too hot - move knob to
cooler position until control valve opens.
Check control manufacturer's instructions
Check primary airflow (nozzle pressure), primary air tempera-
ture and secondary water temperature. Correct to design
conditions.
Room too cold - move themostat knob to warmer position
until control valve opens. Room too hot - move knob to
cooler position until control valve closes.
Check control manufacturer's instructions
Check primary airflow (nozzle pressure), primary air tempera-
ture and secondary water temperature. Correct to design
conditions.
Controls
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