Engineered Comfort 35FH Series User manual

Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Dimensions are in inches (mm).
INSTALLATION INSTRUCTIONS
HORIZONTAL FAN COIL UNITS
MODEL SERIES: 35FH AND 37FH
10/18 EC-35FH-37FH-INST Page 1 of 4
Safety Considerations
The equipment covered by this manual is designed for safe and
reliable operation within its design specification limits. To avoid
personal injury or damage to equipment or property while installing
or operating this equipment, it is essential that qualified, experienced
personnel perform these functions using good judgment and safe
practices. See the following cautionary statements.
Danger
ELECTRICAL SHOCK HAZARDS. All power must be disconnected
prior to installation and servicing this equipment. There may be
more than one power source present. Insure that all power sources
have been disconnected to avoid electrocution or shock injuries.
MOVING PARTS HAZARD. Motor and blower must be disconnected
prior to opening access panels. Motors can start automatically;
disconnect all power and control circuits prior to servicing to avoid
serious crushing or dismemberment injuries.
BURN HAZARD. Electrical resistance heating elements must
be disconnected prior to servicing. Electric heaters may start
automatically; disconnect all power and control circuits prior to
servicing to avoid burns.
Caution
The equipment covered by this manual is available with a variety
of options and accessories. Consult the approved unit submittal,
order acknowledgment and other manuals for details on the options
and accessories provided with the equipment on each project. Safe
practices regarding mechanical equipment must be followed at
all times when handling, installing or servicing any unit. All power
must be disconnected before any installation or service should
be attempted. More than one power source may be supplied to
the unit. Power to remote mounted control devices may not be
supplied through the unit. Never wear bulky or loose fitting clothing
when working with mechanical equipment. Gloves should only
be worn when required for proper protection from heat or other
possible injury. Safety glasses or goggles should always be worn
when drilling, cutting or working with chemicals such as lubricants.
Never pressurize any equipment beyond specified test pressures.
The manufacturer assumes no responsibility for personal injury or
property damage resulting from improper or unsafe practices during
handling service or operation of any equipment.
Preface
Nailor Industries fan coils represent an investment, which can, when
installed and operated properly, give long and trouble free service.
Your equipment is initially protected under the manufacturer’s
standard warranty. However, this warranty is provided under the
condition that the steps outlined in this manual for initial inspection,
proper installation, periodic maintenance and everyday operation
of the equipment be followed in detail. This manual should be
fully reviewed in advance of any actual work being done on the
equipment. Should any questions arise, please contact your local
Sales Representative or the factory before proceeding.
Unpacking and Inspection
All units have been carefully inspected, tested and packaged at
Nailor’s manufacturing facility. It is the responsibility of the receiving
party to inspect the equipment upon arrival. Any obvious damage
to the packaging and/or its contents should be recorded on the
bill of lading and a claim should be filed with the freight carrier.
After determining the condition of the unit’s exterior, including all
piping, each unit should be carefully removed from the package
and inspected for hidden damage. Any hidden damage should be
recorded and immediately reported to the carrier and a claim filed.
Should a claim for shipping damage be filed, the unit, the shipping
package and all packing must be retained for inspection by the
freight carrier. All equipment should be stored in the factory shipping
package until installation. At the time of receipt, the equipment type
and arrangement should be verified against the order documents.
Should any discrepancy be found the local sales rep should be
notified immediately so that the proper action may be instituted. The
factory must be notified about any questions concerning warranty
repairs BEFORE any corrective action is taken. Should equipment
require factory operations a Return Authorization Number will be
issued. Any returns not marked with an authorization number will
be refused. The manufacturer will not accept claims for expenses
not authorized.
Receiving Inspection
After unpacking the fan coil unit, check it for shipping damage. If
any shipping damage is found, report it immediately to the delivering
carrier. Store units in a clean, dry location.
CAUTION: Do not use copper coil connections, drain pan
connections, outside air inlet collar, damper shaft, airflow sensor,
electrical conduit, or valve packages as a handle to lift or move
assembly. Damage to the fan coil unit or controls may result.
Ship Loose Items
Items may often be shipped loose for field installation. These items
are shipped loose to offer protection against shipping and job site
damage or by customer request. Refer to packing slip. These items
require the same inspection as the unit.
Minimum Access
Make appropriate accommodations for access panel removal. The
35FH units have access panels on the top, bottom and sides. Some
access may be limited depending on options. The 37FH units have
top and bottom access panels. Electrical enclosures have access
panels that are equipped with hinges. Blowers, motors, coils and
drain pans can be accessed and inspected from the bottom access
panel. For clearances for full opening of hinged access doors, refer
to project specifications, submittal sheets and NEC.
IMPORTANT: These recommendations do not preclude NEC or
local codes that may be in effect, which are the responsibility of the
installing contractor.
For units including valve package enclosures ensure that the access
door to the valve package is not obstructed. Optional universal filter

Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Dimensions are in inches (mm).
Page 2 of 410/18 EC-35FH-37FH-INST
racks if selected provide access for filter replacement from the side
or bottom of the rack. Consult relevant submittals and/or project
plans detailing the location of these items.
Handling & Installation
Even though the Nailor fan coil unit is a sturdily constructed unit,
great care should be taken when handling it. Care should be taken
to protect the blower assembly, coil, piping, and drain stub outs
during handling. The piping and blower assemblies should not be
used as handles for lifting or moving the unit. Units may also have
delicate internal components that could be damaged by improper
handling. Care should be taken to prevent impact forces on the unit
that may cause internal damage.
The units covered in this manual are not suitable for outdoor
installation and should never be used for that purpose. The units
should never be stored or installed where they may be subjected to
a harsh environment such as rain, snow, or extreme temperatures.
Care should be taken to prevent any materials such as paint,
plaster, drywall dust, and other construction materials from being
deposited in the drain pan, heater, coils, or on the motor or blower
wheels. Failure to do so may have negative effects on unit operation
and may result in premature failure. To prevent contamination, the
units should have some form of temporary covering placed over
them during construction.
For model series 35FH & 37FH; suspend the unit from the building
structure in a horizontal plane. Be careful not to obstruct the bottom
access panels with support channels or straps. When requested,
unit is supplied with field mounted hanger brackets for use with
hanger rod up to 3/8" (9.5) diameter. Hanger brackets or straps
should be screwed to the top corner posts, unit casing sides, or
alternatively onto the inlet and outlet ends of the unit. Fan coil
units are too heavy to suspend with the ductwork they must be
independently supported. For the 35FH Size 30 & 40 it is advised
that these units are mounted by a trapeze suspension. The unit
must be mounted level. The drain pan has a built-in slope to ensure
proper drainage. Field-furnished and installed accessories such
as ductwork, mixing boxes, economizers, dampers, and valve
packages must be independently supported and must not rely on
the unit for support.
After unit is mounted, the service connections such as water, drain
and electrical can be made. At this time it should be confirmed that
the proper types of service have been provided to the unit. The
water connections should be checked for line size, temperature,
and location. Electrical service to the unit should be compared to
the unit nameplate to verify compatibility. The routing, and sizing
of all piping, the type and sizing of all wiring and other electrical
components such as circuit breakers, disconnects switches, etc.
should be determined by the individual job requirements and should
not be based on the size or type connections provided with the
equipment. All installations should be made in compliance with all
governing codes and ordinances. This compliance to all codes is
the responsibility of the installing contractor.
Fan Coil Unit Support Using Trapeze Suspension.
Fan Coil Unit Support Using Hanger Brackets and Rods.

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
pressure + 1
J= H/2
L= H + J + Pipe diameter + Insulation

Fan Coil Units www.engineered-comfort.com
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Dimensions are in inches (mm).
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Page 4 of 4 10/18 EC-35FH-37FH-INST
Start Up
General
Before beginning any startup operation all start up personnel should
familiarize themselves with the unit options, accessories, and
control sequence to understand the proper system operation. All
personnel should have a good working knowledge of the general
start up procedures along with the appropriate start-up guides
and balancing guides available. The building must be completely
finished with all doors, windows, interior walls and insulation in
place. The entire building should be as complete as possible before
beginning any system balance. Before any startup operations occur
a final visual inspection should be made of the system. Once it has
been established that the installation is correct, complete, and no
foreign articles have been left in the units or other areas the startup
procedure can begin.
Cooling/Heating System
Before the water system is started and balanced the chill/hot water
systems should be flushed to remove any contaminant that might
collect in the system during construction. All unit service valves
must be in the closed position during this operation to keep foreign
matter from entering the unit and clogging the valves. Strainers
should be installed in the piping mains to prevent this material from
entering the units while they are operating. During the filling of the
system the vent valve on top of the coil should be turned counter
clockwise one and one-half turns so any trapped air in the coil can
escape.
CAUTION: The coil air vents are not to be used to bleed the entire
system. The main piping must have air vents installed in it where
potential air traps could be located. Some systems may require
repeated venting over a period of time to properly eliminate air from
the system.
CAUTION: Do not exceed 350 PSIG operating pressure.
Electric Resistance Heater Assembly
Electric resistance heaters typically require no normal periodic
maintenance when unit air filters are changed properly. The two
most important operating conditions for an electric heater are,
proper air flow, and proper supply voltage. High supply voltage or
insufficient airflow will cause the heater strips to cycle on the high
side. The strip heaters are equipped with automatic reset switches
to prevent overheating of the unit. Once the switches are tripped the
heater will remain off until it cools past the lower set point for the
trip switches to reset. If the trip switches actuate, the system should
be checked and any condition causing the high limit cutout must be
corrected immediately.
Normal Operation and Periodic
Maintenance
ALL POWER MUST BE SWITCHED OFF BEFORE SERVICING.
General
Each unit on a job will have its own unique operating environment
and conditions that will dictate the maintenance schedule for that
unit. A formal schedule and maintenance log and an individual
unit log should be established and maintained to establish
max performance and service life. Information regarding safety
precautions contained in the preface at the beginning of this manual
should be followed during any service and maintenance operations.
Motor Blower Assembly
Nailor uses permanently lubricated motors that do not require field
lubrication to ensure a long trouble-free blower life. However, should
it become necessary, the blower assemblies in these units are easily
removable. Disconnect wiring from the control panel. Removing the
nuts located in the top and bottom left and right corners of the unit
discharge panel allows the blower assembly to be removed from the
unit. To reinstall the blower assembly, repeat the removal sequence
in reverse order, making sure to reconnect all wiring harnesses. Dirt
and dust should not be allowed to accumulate on the blower wheel
or housing. This can result in an unbalanced blower wheel and
damage the wheel or motor. The wheel can be cleaned periodically
with a vacuum cleaner and brush.
Coil Assembly
To access coils for servicing, remove the bottom access panel of
the blower section. Coils may be cleaned by brushing the coil face
with a soft brush. The brush strokes should be in the direction of
the fin never across the fin. Cleaning with a vacuum cleaner should
follow this. If compressed air is available the coil may be cleaned
by blowing air through the coil from the leaving air-side. Vacuuming
should follow this procedure also. Even coils that have the filter
changed on a regular basis still require cleaning periodically.
Filters
Return air filters should be replaced on a regular basis. The time
interval between each replacement should be established based on
inspection of the filter. If the replacement filters are not purchased
from the factory, the filters used should be the same type and size
as those furnished from, or recommended by the factory.