JOHNSON CONTROLS
35
SECTION 7 - PREVENTIVE MAINTENANCE
FORM 160.76-O1
ISSUE DATE: 6/15/2015
7
2. The evaporator tubes under normal circumstances
will not require cleaning. If the temperature dif-
ference between the refrigerant and the chilled
water increases slowly over the operating season,
it is an indication that the evaporator tubes may be
fouling or that there may be a water bypass in the
waterbox requiring gasket replacement or refrig-
erant may have leaked from the chiller.
3. Heat recovery condenser tubes should be evalu-
ated similiar to evaporator tubes when the heating
circuit is a treated, closed loop. Fouling could be
detected as ability to meet heat load requirements
decreases.
OIL RETURN SYSTEM
1. Change the dehydrator in the oil return system
semi-annually or earlier if the oil return system
fails to operate.
2. When the dehydrator is changed, the nozzle of the
eductor should be checked for any foreign par-
ticles that may be obstructing the jet.
ELECTRICAL CONTROLS
1. All electrical controls should be inspected for ob-
vious malfunctions.
2. It is important that the factory settings of controls
(operation and safety) not be changed. If the set-
tings are changed without Johnson Controls ap-
proval, the warranty will be jeopardized.
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