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Installation Manual – THH
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THH HIGH PERFORMANCE HORIZONTAL
FAN COIL UNITS
Section 1 - Receipt & Initial Installation
AUXILIARY DRAIN PANS
The auxiliary drain pan mounts directly to the unit drain pan using
(2) #10 x 1/2” screws.
After the connections are completed, the system should then be tested
for leaks. Since some components are not designed to hold pressure with
a gas, hydronic systems should be tested with water.
All water coils must be protected from freezing after initial
filling with water. Even if the system is drained, unit coils
may still hold enough water to cause damage when exposed
to temperatures below freezing.
Refrigerant systems should be tested with dry nitrogen rather than air to
prevent the introduction of moisture into the system. In the event that
leaking or defective components are discovered, the Sales Representative
must be notified BEFORE any repairs are attempted. All leaks should be
repaired before proceeding with the installation.
After system integrity has been established the piping should be insulated
in accordance with the project specifications. All chilled water piping and
valves or refrigerant suction piping not located over drain pans must be
insulated to prevent damage from sweating. This includes factory and field
piping inside the unit cabinet.
The drain should always be connected and piped to an acceptable disposal
point. For proper moisture carry-off, the drain piping should be sloped
away from the unit at least 1/8” per foot. A drain trap may be required by
local codes and it is strongly recommended for odor containment.
caution
Condensate Trap
“H” MUST BE AT LEAST
1 INCH PLUS CASING
ST
ATIC PRESSURE
H
X
“X” MUST BE
LEAST 1 INCH
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