Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Dimensions are in inches (mm).
Page 3 of 4
10/18 EC-35FH-37FH-INST
Ductwork
All ductwork and/or supply and return grilles should be installed
in accordance with the project plans and specifications. The
rectangular discharge opening is designed for a flanged duct
connection. A clear area around the opening has been left for screw
penetration. Fasten and seal all connections by method prescribed
in the job specification.
IMPORTANT:
The dimension from the top of the unit to the top of
the blower opening changes as the unit is configured for left or right-
hand controls orientation. The unit submittal should be consulted
to determine appropriate location of unit discharge to facilitate
ductwork design.
For outside air inlet duct connections slip each inlet duct over
the inlet collar of the outside air connection. Fasten and seal the
connection by the method prescribed in the job specification. The
diameter of the inlet duct in inches must be equal to the nominal
size of the outside air inlet. The outside air inlet collar is 1/8" (3)
smaller than the nominal duct size to allow it to fit inside the duct.
IMPORTANT:
Do not insert ductwork inside the inlet collar of the
assembly. For optimum performance, 2 to 3 equivalent diameters
of straight duct should be installed prior to the outside air inlet of
the unit. All ducts should be installed in accordance with SMACNA
guidelines.
Coils & Valve Package
All valve components should be installed as required, and all
service valves should be checked for correct operation. If coil and
valve package connections are to be made by braze or solder, care
should be taken to assure that no components in the valve package
are subjected to a high temperature which may damage seals or
other materials. Valve bodies should be wrapped with a wet rag
to help dispel heat during brazing or soldering operations. Protect
adjacent flammable materials when brazing. Use flame and heat
protection barriers where needed. The chilled water valve package
should be installed such that all pipes and fittings that extend
beyond the drain pan are contained in the auxiliary drain pan or
other device or insulated to prohibit sweating. All piping leading to
the unit must be sufficiently supported to avoid excessive stress on
the unit’s piping. However, adequate free movement is required
for thermal expansion/contraction. If union connections are used,
backup wrenches must be used during any tightening process to
keep the copper tube or fitting from being damaged. Nailor will not
accept any responsibility for improper tightening procedures that
damage the connections.
Factory installed threaded connections have been tightened and
tested at the factory before shipping. These connections must be
checked for tightness in the field before unit is put into service
to ensure fittings did not loosen due to shipping vibration. Any
connection found to be loose must be tightened. Nailor will not be
held responsible or accept any charges for tightening loose fittings.
After the connections are completed, the system should then be
tested for leaks. All water coils must be protected from freezing
after initial water fill. Even if the system is drained unit coils may still
retain enough water to cause damage if exposed to temperatures
below freezing. Shutoff ball valves when ordered as a valve
package accessory will always ship loose for field install.
Drain Pan
The drain pan is internally sloped toward the drain connection.
The drain should be checked before initial startup, and periodically
thereafter to assure that the drain is clear. If the drain is clogged,
steps should be taken to clear the debris so that condensate will
flow easily.
Condensate Trap
Install drain line and trap in accordance with all applicable codes.
A slope of 1/8 in. per 1 ft. of condensate drain line run is necessary
for adequate condensate drainage. Insulate the drain line to
prevent sweating. Supports are required for the drain line to prevent
excessive stress on the drain pan. A drain trap may be required by
local codes and is recommended for odor control. Each drain pan
should be individually trapped. See Figure below for details.
Electrical Connections
The unit nameplate lists the unit electrical characteristics such
as the required voltage, fan and heater amperage, and required
circuit ampacity. The unit-wiring diagram shows all unit and field
wiring. Because each project can be 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.
An adequately sized fuse, circuit breaker, or disconnect that meets
local and national electric codes must be supplied. All electrical
connections should be checked for tightness before startup. All
field-installed components should be located and checked for
proper function and compatibility. All internal components should
be checked for shipping damage and any loose connections should
be tightened to prevent any problems during startup. Any devices
furnished by the factory for field installation must be wired in strict
accordance with the applicable wiring diagrams. Failure to do so
could result in personnel injury or damage to the equipment and will
void all manufacturers’ warranties.
H
J
L
P-TRAP
H
= Maximum negative static
pr 1
J
= H/2
L
= H + J + Pipe di Insulation
