York YHAU-CE-JE Series, Установка, эксплуатация и обслуживание, Страница: 101 / 136

JOHNSON CONTROLS
101
SECTION 7 – MAINTENANCE
FORM 155.33-ICOM2.EN.GB
ISSUE DATE:12/4/2017
7
TASK CONTENTS FREQUENCY SCOPE
Repair paint (epoxy paint)
of inside wall of chilled /
hot water and cooling
waterboxes
Repair the paint of the inside wall periodically.
Chilled / hot water:
Every 2 years
Cooling water: Yearly
S
Analysis of solution and
addition of inhibitor
The concentration of the inhibitor must be kept proper to
prevent corrosion of inside parts. Analyze the solution to
detect leakage in the early period.
Every 6 months S
Filtration and refining of
solution
As the inside of the chiller-heater is corroded, corrosion
particles are increased. Particles accumulate on the heat
exchange tube surfaces and lower the heat exchange
rate. Filter the solution periodically.
5-6 years S
Check operation of various
safety relays
Check the operation of the safety relays periodically.
Yearly
S
Clean tubes with brush
or water jet (Absorber,
condenser)
If foreign matter sticks to the inside of the tubes of the
chiller-heater, refrigerating performance goes down and
the tubes become corroded. Remove slime, soft scales,
and other foreign matter from the inside of the tubes
periodically.
S
Clean tubes with brush or
water jet (Evaporator)
Every 2 years*
S
Chemical cleaning of tubes
(Absorber, condenser)
Since hard scales sticking to the tubes cannot be removed
with a brush or water jet, remove them chemically,
depending on the condition.
S
Chemical cleaning of tubes
(Evaporator)
Every 4 years* S
Check for slight leakage
Vacuum and airtightness must be maintained to ensure
the reliability and performance of the absorption chiller-
heater. The machine should be checked for slight leakage
with a special vacuum and airtightness diagnostic device
periodically.
Every 2 years S
Eddy current test on tubes
(Absorber, condenser)
Check the inside of the tubes for corrosion caused by bad
quality chilled / hot water, and cooling water periodically.
Every 4 years or
10,000 hrs
S
Eddy current test on tubes
(Evaporator)
Every 6 years S
C = Customer, S = Johnson Controls Service
NOTE:
*If water quality analysis indicates necessity.
TABLE 19 - MAINTENANCE AND INSPECTION, CONT'D