The scope of supply of delivery is inside the parameters of the unit shown in
Installation and piping are outside the scope of supply and should be supplied and prepared by the
contractor or customer. See Figure 19 to plan the fuel supply piping from oil storage tank to chiller-
heater.
Figure 19: Oil system
Follow the list of precautions below:
• Install an oil gauge near the chiller-heater.
• The oil service tank must be installed on the same floor and be level with the chiller-heater.
Note:
The oil service tank must be installed in such a way that oil supply pressure at the oil
input of the fuel oil burning pump is not less than 0 mmHg and not more than 368 mmHg.
• An oil level control device and an oil level alarm device must be installed at the oil service tank to
prevent accidents such as oil leakage.
• Adequate flushing of the connection piping must be performed.
• During commissioning, be sure to purge air from the oil pump.
• Prevent foreign materials such as water, sludge, or other materials from entering into the oil
tank piping. If water, sludge, or other materials enter the oil piping, it can cause incomplete
combustion of the burner.
• When the temperature at the fuel tank or oil delivery line becomes below 32°F, fluidity of the
fuel can drop and cause generation of soot or flame failure due to insufficient combustion. A
band heater must be installed, depending on insulation and the other circumstances, so that
temperature of the fuel tank and the oil delivery line is maintained at above 32°F.
• Because static electricity can stay at the oil piping and the oil tank, those parts must be grounded
with a metallic conductor to remove the static electricity.
• Cleaning the furnace and gas duct at fixed intervals is necessary.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
34
