Inspection
The unit must be inspected by a Johnson Controls Service representative before customer use. All
damage or possible damage must be reported to the transportation company. For further details,
see
.
Note:
The chiller charges the solution and refrigerant water before delivery, and also charges
N
2
to 4 psig (0.3 BarG), to pressurize the unit.
Inspection window
The inspection window of the exhaust gas duct or chimney must not be turned to the aisle side
in case the exhaust gas duct or chimney has a problem from a unit failure or burner combustion
deterioration. If it must be turned to the aisle side, install a guard fence around the inspection
window.
Installation guidelines
Gas pipe fittings must be installed by a qualified contractor. Defective gas piping can cause an
oxygen- deficient accident or a fire.
When evacuating the nitrogen charge from the factory, ensure correct ventilation in the area.
Failure to do this could result in suffocation.
When exhaust gas is emitted from the smokestack, it is critical that it does not mix with the cooling
water in the cooling tower. This can lower the quality of the cooling water, resulting in corrosion
and scale formation. As sulfides and carbides contained in the exhaust gas are condensed, low
temperature corrosion occurs, resulting in tube perforations. This can cause complications with
the chiller-heater, and can result in a serious accident. The smokestack and cooling tower must
be placed at least 16.7 ft (5 m) apart. Wherever possible, the smokestack must be positioned
downwind of the cooling tower, with regards to prevailing winds.
When storing the absorption chiller unit after it has been delivered, note the following potential
issues:
• Problems with machine in storage:
- Breaking of thin pipes caused by freezing of the refrigerant (water) sealed in the machine
and resulting air leak.
- Breaking and air leak due to external damage.
- Deterioration of electrical parts caused by soot and dust.
- Deterioration of electrical parts caused by rainwater (moisture).
- Rusting of the machine body caused by rainwater/moisture. Air leaks can cause serious
damage and are costly repairs. Use diligence in keeping the machine body free from
moisture at all times.
• Problems and preventative measures
21
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
