Operating instructions

11
MAINTENANCE
GENERAL INFORMATION
ALL MAINTENANCE SHOULD BE
PERFORMED BY SKILLED, EXPERIENCED
PERSONNEL. Your Authorized Yazaki Service
Provider 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 to
the equipment.
ROUTINE MAINTENANCE
Routine maintenance should be provided
throughout the life of the equipment to ensure
satisfactory operation and performance.
During the warranty period, an Authorized
Yazaki Service Provider must be engaged to
provide routine maintenance on chillers at the
beginning of each cooling season (spring
changeover) and, on chiller-heaters at the
beginning of each cooling season (spring
changeover) and heating season (fall
changeover). When the chiller or chiller-heater is
used for process cooling or heavy load operation
it may be necessary to schedule additional
service visits to evacuate noncondensible gases
from the vacuum section. The following routine
maintenance checks and adjustments are
normally performed on the chiller or chiller-
heater:
Spring Changeover (Cooling Operation of
Chiller/Chiller-Heater)
1. Evacuate noncondensible gases from the
vacuum section.
2. Measure and adjust (if necessary) the
chilled water, cooling water and heat
medium flows.
3. Check the function of the chilled/hot water
flow switch.
4. Measure the absorption cycle temperatures
and verify that they are normal.
5. Measure the inlet and outlet chilled water,
cooling water and heat medium
temperatures.
6. Check the mounting level of the chiller or
chiller-heater.
7. Measure the power supply voltage in each
phase.
8. Inspect the cooling tower and cooling water
circuit. (Note the condition of the cooling
water and effectiveness of the water
treatment provided.)
9. General inspection of the chiller cabinet and
components.
Fall Changeover (Heating Operation of
Chiller-Heater)
1. Evacuate noncondensible gases when the
evaporator is less than 90
o
F.
2. Measure and adjust (if necessary) the hot
water and heat medium flow.
3. Check the function of the chilled/hot water
flow switch.
4. Measure all temperatures around the chiller-
heater (including the inlet and outlet hot
water and heat medium temperatures) and
verify that they are normal.
5. Measure the power supply voltages in each
phase.
6. General inspection of the chiller-heater
cabinet and components
WINTERIZING
When the equipment is located outdoors in
climates subject to freezing, cooling water must
be drained from the chiller/chiller-heater, piping
and cooling tower at the end of the cooling
season. Use glycol of adequate concentration in
the chilled/hot water and heat medium circuits to
prevent freeze damage. The glycol will reduce
the cooling and heating capacity but this may be
offset by increasing the circuit flow. If in doubt
about potential freeze damage in your area,
discuss it with your Authorized Yazaki Service
Provider. Remember, damage to the chiller or
chiller-heater due to freezing is not covered by
the product warranty.