ENVIRO-TEC
7
FORM ET115.24-NOM11 (118)
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.
ELECTRICAL ENCLOSURE
The electrical control enclosure provides access to the
electrical compartment. This compartment houses all
electric heat and control components. Terminal strips
are furnished for simple power and control wiring
connections. Multiple knockouts allow wiring entries
from either side of the compartment.
All components furnished for field installation, by either
the factory or the controls contractor should be located
and checked for proper function and compatibility. All
internal components should be checked for shipping
damage. After installation and before energizing
the unit, verify voltage and check that all electrical
connections are tight. Electrical connetions should be
periodically checked for tightness.
AUXILIARY DRAIN PANS
Mounted directly to the unit drain pan, AUXILIARY
DRAIN PANS may also be secured by the mounting
holes to field supports or to the unit coil utilizing pipe
hanger wire, plastic ties, or metal strapping.
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.
Prior to removing the auxiliary drain pan, make sure
all accessories have been appropriately disconnected
from the auxiliary drain pan. The auxiliary drain pan
can be removed in three steps. First, remove the two
screws that attached the auxiliary drain pan to the
support bracket near the inlet of the unit. Next, support
the weight of the auxiliary drain pan and slide the
auxiliary drain pan towards the discharge of the unit so
the auxiliary drain pan lip will clear the drain pan lip.
After the auxiliary drain pan slides approximately 0.75
inches, the auxiliary drain pan will be free from the
drain pan. Lastly, support the weight of the auxiliary
drain pan and safely lower for servicing. Reinstall prior
to unit startup.
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.
Units can be configured from the factory with duct
collars for attaching ductwork. The factory suggests
using galvanized sheet metal ductwork or a flexible
canvas attached to the duct collars using sheet metal
screws. Duct connections should follow SMACNA
standards and national and local codes.
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.
Figure 4: Electrical enclosure
