Yazaki CH-K100, Operating Instruction

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8
MAINTENANCE
GENERAL INFORMATION
ALL MAINTENANCE SHOULD BE
PERFORMED BY TRAINED AND
EXPERIENCED PERSONNEL. Your Yazaki
Authorized Service Provider
(ASP)
can help
you establish a standard maintenance
procedure.
For your safety, keep the area around
the equipment clear and free of combustible
materials, gasoline and other flammable
substances. DO NOT obstruct service
access or combustion air supply to the
equipment.
ROUTINE MAINTENANCE
Routine maintenance should be provided
throughout the life of the equipment to
ensure
satisfactory performance and
operation.
During the warranty period, an ASP must
be engaged to provide routine maintenance
on chiller-heaters at the beginning of each
cooling season. When the chiller-heater is
used for process cooling or heavy load
operation it may be necessary to schedule
additional service visits to evacuate non-
condensable gases from the vacuum
section.
MAINTENANCE INTERVALS
Every 4 months
(Spring, Summer, Winter)
:
Evacuation
(Units not used in Heat mode can
skip the winter evacuation)
Every 12 months:
Burner Combustion Analysis and Gas
Pressure Check
(Supply and Manifold)
Inhibitor Check
(If required. For the K-Series, an
inhibitor charge is needed every 3 years, on
average.)
Palladium Cell Heater Check
Flow Rate Check
Solution Pump Rotation Check
Flame Rod Replacement
(if required)
Igniter Rod Replacement
(if used and required)
Every 3 years:
HGE Inspection
(pulling the burner to see the
condition inside the HGE)
Average interval for Inhibitor Charge
Average interval for Flame and Igniter Rod
Replacement.
EVACUATION OVERVIEW
Arguably the most important aspect of
maintenance for the chiller-heater is
maintaining a proper level of vacuum.
Evacuation is performed at the front of the
machine. The evacuation service valves are
referred to as Service Valve A
(upper)
and
Service Valve B
(lower)
.
The evacuation service valves are back-
seating access valves similar to those used
throughout the refrigeration industry. The
stem has a 10mm square head. The stem
secures a copper seal to a steel seat inside
the valve. Do not over-torque this valve or
else the seal can become damaged and
compromise vacuum integrity. The proper
torque is 14.75 ft-lbs
(20 Nm)
. Yazaki offers a
torque wrench
(P/N N7510)
specifically for
use with this service valve.
A number of precautions should be
observed at all times during evacuation.