HBX / MBX SERIES
FAN COIL UNITS
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
**WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER**
Altering the product or replacing parts with non authorized factory parts voids all warranty or implied
warranty and may result in adverse operational performance and/or a possible hazardous safety
condition to service personnel and occupants. Company employees and/or contractors are not
authorized to waive this warning.
GENERAL
The manufacturer assumes no responsibility for equipment installed in
violation of any code requirement.
These instructions give information
relative to the installation of these fan
coil units only. For other related
equipment refer to the proper instructions.
Material in this shipment has been
inspected at the factory and released
to the transportation agency in good
condition. When received, a visual
inspection of all cartons should be
made immediately. Any evidence of
rough handling or apparent damage
should be noted on the delivery receipt
and the material inspected in the presence of the carriers representative. If
damage is found, a claim should be
filed against the carrier immediately.
FAN COIL UNIT
The installer must adhere strictly to
all local and national code requirements pertaining to the installation of
this equipment. These units are designed to be installed in either an
upflow or horizontal left or right side
down position.
****** WARNING ******
Extreme caution must be
taken that no internal damage
will result if screws or holes are
drilled into the cabinet.
All fan coil units are U.L. Listed for
installation with zero inches clearance to combustible materials. This
includes the fan coil cabinet, discharge plenum and connecting ducts.
Sufficient clearance must be provided
at the front of the fan coil to allow
access to electrical controls and removal of the motor/blower assembly
for servicing. This clearance distance
should be approximately the same as
the depth of the fan coil unit.
HORIZONTAL
APPLICATION
HBX/MBX fan coil units are factory
assembled for horizontal left side
down application without any modification required. To convert to horizontal right side down, remove the horizontal drain pan and A-coil assembly,
flip the horizontal drain pan over to the
right side and re-install the horizontal
drain pan and A-coil into the cabinet.
Secure the forward edge of the horizontal drain pan with the leveler angle
bracket. The unit should be leveled in
such a way that there is slope toward
the condensate drain nipple to assure
positive drainage.
AIR DISTRIBUTION
DUCTS
All duct work must be installed in
accordance with National Fire Protection Association Codes 90A and 90B.
Ducts should be adequately insulated
to prevent condensation during the
cooling cycle and to minimize heat
loss during the heating cycle. The
return air duct must have the same
free area as the opening provided on
the fan coil unit. If there is no ducted
return, applicable installation codes
may limit the unit to installation only in
a single story residence. In many
cases it is acceptable to use ducting
of the same size as the fan coil connections. However, unique arrangements or long duct runs must be
****** WARNING ******
Unit must not be operated
during building construction
due to excessive airborne dust
and debris. The unit must not
be operated under any
circumstances without an air
filter in place.
confirmed by a local professional. The
manufacturer will not be responsible
for misapplied equipment.
ELECTRICAL
Fan coil units with 10kW or less
electric heat are provided with a terminal block for connection of 1 electrical
service. Units with 15kW and 20kW
are provided with dual circuit breakers
for the connection of 2 electrical services and units with 25kW are provided with 3 circuit breakers for the
connection of 3 separate electrical
services. (Figure 1)
All wiring must comply with local
and national code requirements.
Units are provided with wiring diagrams and nameplate data to provide
information required for necessary
field wiring. Knockouts are provided
on the cabinet for connection of power
supply.
These units are provided with a
Class 2 transformer for 24-volt control
circuits. Should any add-on equipment also have a Class 2 transformer
furnished, care must be taken to prevent interconnecting outputs of the
two transformers by using a thermostat with isolating contacts.
L247B 9/03
INSTALLATION
PRECAUTIONS
Installation of this fan coil should
only be performed by a licensed contractor to ensure proper installation
and the safety of the installer. The
following are some precautions to be
followed for typical installations.
Always use proper tools and equipment.
No wiring or other work should be
attempted without first ensuring that
the fan coil is completely disconnected from the power source and
locked out. Always verify that a good
ground connection exists prior to energizing any power sources.
Always review the nameplate on
each unit for proper voltage and control configurations. This information
is determined from the components
and wiring of the unit and may vary
from unit to unit.
****** WARNING ******
Any devices such as fan
switches or thermostats that
have been furnished by the
factory for field installation
must be wired in strict accordance with the wiring diagram
that is supplied with the unit.
Failure to do so could result
in damage to components
and will void all warranties.
When soldering or brazing to the
unit, it is recommended to have a fire
extinguisher readily available. When
soldering close to metering devices or
other components, heat shields or
wet rags are required to prevent damage.
When the fan coil unit is in operation
components are rotating at high
speeds.
Units must be installed level to
ensure proper drainage and operation.
Check unit prior to operation to
ensure that the condensate water will
drain toward the drain connection. An
overflow drain or an auxiliary drain pan
under the fan coil may be required as
a back up to a clogged primary drain.
Be sure that the drain pan is free
from foreign material prior to start up.
Check filter media installation to
ensure that it is installed correctly.
Use the directional arrows or other
information on the filter to determine
the proper flow direction.
Ensure that the air distribution system does not exceed the external
static rating of the unit.
NOISE
These fan coil units are designed for
quiet operation, however, all air conditioning equipment will transfer some
amount of noise to the conditioned
space. This should be taken into
consideration when planning the location of the equipment.
MOUNTING
It is important to ensure that the fan
coils are securely mounted and the
structure is sufficient to support the
weight of the equipment. All anchors
for mounting the equipment must be
placed and sized to ensure a safe and
durable installation.
CAUTION: It is highly recommended that an auxilliary drain
pan be located beneath the fan
coil to prevent damage which
may result from an overflow of the
condensate pan.
COOLING COIL PIPING
These fan coil units are supplied
with a direct expansion refrigerant
coil. The suction and liquid refrigerant
lines must be sized in accordance
with the outdoor unit manufacturers
recommendations.
****** WARNING ******
When connecting piping to
fan coil units, do not bend or
reposition the coil header tub-
ing for alignment purposes.
This could cause a tubing frac-
ture resulting in a refrigerant
leak when pressure is applied
to the system.
Condensate drain lines must be
installed with adequate slope away
from the unit to assure positive drainage. Since the drain pan is located on
the suction side of the blower, a
negative pressure exists at the drain
pan and a minimum trap of 1-1/2
inches must be provided in the drain
line to assure proper drainage.
NOTE: If a Condensate Overflow
Shut-off Switch, that is designed to
be installed in the drain line, is used
in place of a secondary drain line,
then the cut-off switch should be
located in the primary drain line between the fan coil unit and the P-trap.
OPERATION AND
MAINTENANCE
Pre-start Check
Check that supply voltage matches
nameplate data.
Ensure that the unit is properly
grounded.
With power off, check blower wheel
set screws for tightness and ensure
that the blower wheels rotates freely
and quietly.
Check that the refrigerant coil con-
nections and piping have been leak
checked and insulated as required.
Start-up and Maintenance
Before start-up, all of the components should be given a thorough
check. Optimal operation of this
equipment requires cleanliness. Often after installation of this equipment
additional construction activities occur. Care must be taken to protect
the equipment from debris during
these construction phases. All access panels and filters must be in
place before operation of the units.
Fan
The fan should be inspected and
cleaned, in conjunction with maintenance of the motor and bearings. It is
important to keep the wheels clean in
order to avoid imbalance and vibration.
****** WARNING ******
Do not touch any rotating
component with any object.
Damage to the equipment and
personal injury can occur.
Motor
Check motor connections to ensure that they are secure and made in
accordance with the wiring diagram.
The blower motor should be
cleaned annually.
Filter
The air filter should be cleaned or
replaced as often as necessary to
prevent restriction of air flow. Always
replace the filter with the same type
as originally furnished.
Coil
Any dust or other contaminants
which accumulate on the heat transfer surfaces interferes with the air flow
and impairs heat transfer. The coil
must be kept clean by any of the
following methods.
Cleaning with low pressure com-
pressed air.
Flushing or rinsing with water (a
detergent is advisable for greasy surfaces).
Drain Piping
The drain should always be:
Connected or piped to an accept-
able disposal point sloped away from
the unit at least 1/8" per foot
Checked before summer operation
Periodically checked during sum-
mer operation
Preventative Maintenance
To achieve maximum performance
and service life of each piece of equipment a formal schedule of regular
maintenance should be established
and maintained.
****** WARNING ******
Always wear eye protection.
When fan coil is operating,
some components are operating
at high speeds. Personal injury
can result from touching these
items with any object
All electrical and service
access panels must be returned
and secured in their proper
place.
Clear surrounding area of all
tools, equipment and debris.
Check the entire unit to
ensure it's cleanliness.
24 VOLT
CLASS 2 WIRING
R
G
24V REMOTE
THERMOSTAT
W1
* W2
Y
COOLING CONTROL
OUTDOOR UNIT
W2 SECOND STAGE ELECTRIC HEAT 15KW THRU 25KW
*
***** WARNING ******
The manufacturer does NOT
WARRANT equipment subjected to abuse. Metal chips,
dust, drywall tape, paint over
spray, etc. can void warranties
and liability for equipment
failure, personal injury and
property damage.
R
G
W1
W2
C
RED
GREEN
WHITE
WHITE
BROWN
FAN COIL
UNIT
CIRCUIT 1
L1- L2
GND GND
30-60MBX 15 & 20 KW
CIRCUIT 2
L3- L4
FIELD WIRING
FACTORY WIRING
Figure 2 Low Voltage Wiring
FIELD WIRING
FACTORY WIRING
48-60MBX 25KW
Figure 1 Field Wiring Connections
GND
GND
GND
FIELD WIRING
FACTORY WIRING
CIRCUIT 1
L1- L2
CIRCUIT 2
L3- L4
CIRCUIT 3
L5- L6
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