2
This product is a gas-fired absorption unit which provides
chilled water for cooling or hot water for heating in central
plant-type air conditioning systems. Units with nominal
refrigeration capacities of 150 and 200 tons are complete
with operating and safety controls. The chiller-heater is fitted
with a low NOx burner, automatic spark ignition systems,
power combustion blower and proportional firing control.
When this equipment has been applied correctly,
installed in accordance with Yazaki INSTALLATION
INSTRUCTIONS (supplied with the chiller-heater), and with
proper maintenance on the chiller-heater itself and
accompanying support items such as pumps, cooling tower,
etc., it can provide many years of trouble free operation.
GENERAL
These instructions are intended to
acquaint the Owner/End User with the
operation and general maintenance
requirements
of
Yazaki
Gas-Fired
Double-Effect Absorption Chiller-Heater
units.
Please read ALL instructions carefully
and observe precautions. Failure to
operate and properly maintain this
equipment in accordance with the
OPERATING
INSTRUCTIONS
may
affect the equipment performance and
product Warranty.
If the equipment does not operate as
expected, check the Troubleshooting
Guide in these instructions BEFORE
calling your Yazaki Authorized Service
Provider
(ASP)
. This approach will not
only save cost but also helps to avoid
any unnecessary down time.
THE ABSORPTION PRINCIPLE
Yazaki absorption chiller-heaters use
a solution of lithium bromide and water,
under vacuum, as the working fluid.
Water is the refrigerant and lithium
bromide is the absorbent. During cooling
operation, refrigerant liquid boils under
the influence of a deep vacuum in the
evaporator and creates a refrigerating
effect which removes heat from the
chilled water circuit.
The double-effect absorption cycle
has two generators
– one heated by a
gas burner and another heated by
superheated refrigerant vapor. The
resulting refrigerant is passed through to
the condenser, and is then metered into
the evaporator. Lithium bromide solution
leaving the generators flows into the
absorber.
Heat from the cycle is removed by
cooling
water
flowing
inside
the
condenser and absorber tubing bundles.
Heat from the cooling water is rejected
most typically to a cooling tower, but may
also be rejected by alternative methods,
including ground loops.
