JOhNsON CONTROLs
12
FORM ET115.24-NOM5 (908)
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.
dUCTWORK CONNECTIONs
All ductwork and/or supply and return grilles should
be installed in accordance with the project plans and
specifications. If not included on the unit or furnished
from the factory, ENVIRO-TEC
®
supply and return
grilles are available in a variety of types.
All units must be installed in non-combustible areas.
Some models are designed to be connected to duct-work
with a MINIMUM amount of external static pressure.
Consult the approved submittals and the product catalog
for unit external static pressure limitations.
Units provided with outside air for ventilation should
have some form of low temperature protection to
prevent coil freeze-up.
It should be noted that none of these methods would
adequately protect a coil in the event of power failure.
The safest method of freeze protection is to use glycol
in the proper percent solution for the coldest expected
air temperature.
The manufacturer assumes no responsibility for
undesirable system operation due to improper
design, equipment or component selection, and/or
installation of ductwork, grilles, and other field supplied
components.
ELECTRICAL CONNECTIONs
The unit nameplate lists the unit electrical characteristics
such as the required supply voltage, fan and heater
amperage and required circuit ampacities. The unit-
wiring diagram shows all unit and field wiring. Since
each project is different and each unit on a project may
be different, the installer must be familiar with the
wiring diagram and nameplate on the unit BEFORE
beginning any wiring. This unit is not acceptable for
installation in hazardous/explosive areas.
Condensate Trap
NOTE:
"A" DIMENSION (IN.) DEPTH MUST BE EQUAL TO OR
GREATER THAN UNIT'S NEGATIVE FAN PRESSURE AT
CONDENSATE PAN (INWC).
"B" DIMENSION MUST BE EQUAL TO (A x 1.5) + ID OF
DRAIN LINE.
A
B
LD13891
