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FWA-AQ SERIES
****** W ARNING ******
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.
****** W ARNING ******
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.
****** W ARNING ******
Extreme caution must be
taken that no internal damage
will result if screws or holes are
drilled into the cabinet.
HOT WATER FURNACE
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.
Current Maintenance Program is available at www.firstco.com under "Product Information".
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 carrier’s representative. If damage is found, a claim
should be filed against the carrier
immediately.
Note: State of MA.-248 CMR code of the
state of MA. requires a pump timer (60
seconds on every 6 hours). See diagram.
FAN COIL UNIT
The installer must adhere strictly
to all local and national code require-
ments pertaining to the installation of
this equipment.
These units are designed to be
installed in either an upflow, downflow
or horizontal position.
All fan coil units are U.L. listed for
installation with zero inches clearance to combustible materials. This
includes the unit cabinet, discharge
plenum and connecting ducts. Sufficient clearance must be provided at
the front of the unit to allow access to
electrical controls and removal of the
motor / blower assembly for servicing.
This clearance distance should be
approximately the same depth as the
fan coil unit.
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 minimize heat loss during the heating cycle. All return air must be filtered
to prevent dirt buildup on the coil surface. 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
confirmed by a local professional.
The manufacturer will not be responsible for misapplied equipment.
ELECTRICAL
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 each side of the cabinet for connection of power supply.
These units may be 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.
L2462 02/09
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INSTALLATION
****** WARNING ******
Do not touch any rotating
component with any object.
Damage to the equipment and
personal injury can occur.
****** WARNING ******
When connecting piping to
fan coil units, do not bend or
reposition the coil header tubing for alignment purposes.
This could cause a tubing fracture resulting in a water leak
when water pressure is applied to the system.
PRECAUTIONS
Installation of this fan coil should
only be performed by properly trained
personnel 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.
• When soldering or brazing to the
unit, it is recommended to have a fire
extinguisher readily available. When
soldering close to valve packages 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 operation.
• 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.
HOT WATER COIL
PIPING PRECAUTIONS
• Flush all field piping prior to connection to remove all debris.
• Use wet cotton rags to cool valve
bodies when soldering.
• Open all valves (midway for hand
valves, manually open on motorized
valves) prior to soldering.
• When soldering to bronze or brass,
heat the piping while in the socket/
cup and begin introducing the solder
when the flux boils rapidly.
Avoid direct flame into the solder joint.
• Heat can only be applied to the cup
of the valve body for a minimal time
before damage occurs (even with the
use of wet rags.
• Avoid rapid quenching of solder
joints as this will produce joints of
inferior quality.
• Connect all piping per accepted
industry standards and observe all
regulations governing installation of
piping systems. When all connections are complete the system must
be pressure tested. Repair any solder joint leaks and gently tighten any
leaking valve packing nuts and piping
accessories as required. Hydronic
systems are not designed to hold
pressurized air and should only be
tested with water.
HOT WATER COIL PIPING
Figure 1 illustrates a typical piping
schematic for an Aqua Therm System.
The hot water coil connections are
3/4 inch nominal (7/8” OD) copper.
The hot water supply to the fan coil
should be on the right when facing the
fan coil upright and from the front.
****** WARNING ******
An expansion tank may be
required if a back-flow
preventer is installed in the
system.
All piping between the water heater
and fan coil unit should be copper and
should not exceed 200 feet of total
piping. It is recommended that 3/4”
nominal (7/8” OD) piping be used to
prevent excessive head pressure
losses. (Consult the factory for other
piping applications.)
It is also recommended that all
piping be adequately insulated to prevent freezing when piping is run in an
unconditioned space.
Solder Connections - All copper
joints in the water lines must be made
with low temperature - non lead
solder.
"T" Connections (at the water
heater) Water lines to and from the fan coil
unit must be taken from the horizontal
connection of the "T" fittings in the
vertical hot and cold water supply
lines at the water heater. This ensures that any air in the system will be
purged each time water is used in the
dwelling. (See figure 1)
Isolation Valves - Two valves are
recommended to be installed within
the circulating loop to permit servicing
of the system if required and to assist
in purging the system.
NOTE: Hot water coil freeze protection is available for applications
where the fan coil is located in ambient air locations (attics, crawl
spaces, etc.) or within structures that
may be unoccupied during freezing
conditions. Consult the factory for
additional information.
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OPERATION AND
****** W ARNING ******
• 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.
****** W ARNING ******
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.
****** W ARNING ******
To prevent pump damage,
the fan coil unit should not be
energized for heating until the
hot water coil and all water
lines have been purged of air.
****** W ARNING ******
Hot water can cause scalding.
A hot water mixing valve can
be applied to the system to
temper domestic water draw.
**MAINTENANCE UPDATES**
For a current copy of the
Maintenance Program log on
to www.firstco.com and
look under "Product Information"
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 screw for tightness and ensure
that the blower wheel rotates freely
and quietly. Remove the motor
blower shipping brace on the 60MBQ
blower assembly.
• Check that the water coil, valves
and piping have been leak checked
and insulated as required.
• Ensure that all air has been vented
from the hot water coil.
NOTE: It may require purging several
gallons of water so have a means of
discarding the water.
• Install all panels.
NOTE: The blower door must be in
place for the unit to operate due to the
door safety switch.
• Install any filters which may have
been removed during the installation
process.
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 installlation of this equipment additional construction activities occur. Care must be taken to
protect the equipment from debris
during these construction phases.
Fan
The fan should be inspected and
cleaned, in conjunction with maintenance of the motor and bearings. It is
important to keep the wheel clean in
order to avoid imbalance and vibration.
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.
Coil
Any dust or other contaminants
which accumulate on the heat transfer surfaces interferes with the air flow
and impairs heat transfer. The coil
should be checked and cleaned annually by a licenced contractor.
Filter
The air filter should be cleaned or re-
placed every 30 days or more frequently
if severe conditions exist.
place the filter with the same type as
originally furnished.
Always re-
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. The equipment
should be checked annually by a
licenced contractor.
HEATING CYCLE
START - UP
1) Fill the water heater. Open a hot
water faucet while filling the water
heater to vent the air. When the
tank is full and all the air is purged,
close the faucet.
2) Ignite the water heater and set the
thermostat to 140 degrees.
3) Purge the air handler's hot water
coil and lines.
NOTE: It may require purging several
gallons of water so either have a
bucket available or a means of discarding the water.
Close valve number 1 and open
valve number 2. (See figure 1 )
Next, open the air bleed valve.
When all of the air is purged from
the lines close valve number 2 and
open valve number 1. After all the
air is purged from the coil and
lines, open both valve number 1
and 2 and close the air bleed valve.
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4) Switch the room thermostat to the
"Heat" position and raise the tem-
perature setting to a position approximately ten degrees above
room temperature.
NOTE: The door switch must be
activated to operate the unit.
The pump should energize and begin circulating the hot water
through the coil. If the pump is
operating properly and the water
temperature in the water heater has
reached the set point, then the hot
water inlet at the fan coil unit will be
hot. If the pump is running but hot
water is not circulating, open the air
bleed valve long enough to purge
any remaining air from the hot water
lines and coil. This will allow the
pump to begin circulating hot water.
5) The water heater thermostat should
be adjusted so that the water temperature entering the hot water coil
is as close to 140 degrees as possible with the system energized
and operating long enough for all
temperatures to stabilize.
PUMP REPLACEMENT
Disconnect electrical power before
servicing the unit.
To replace the circulator pump,
close the isolation valves and relieve
the water pressure within the heating
loop. Disconnect the pump's 115 volt
power lines within the control box and
remove the four hex head screws securing the pump motor to the pump's
volute.
Reverse the above steps for reas-
sembling the pump, however make
sure that the pump or volute has the
rubber o-ring in place before assembling.
CHECK VALVE
REPLACEMENT
Disconnect electrical power before
servicing the unit.
To replace the internal check valve,
close the isolation valves and relieve
the water pressure within the heating
loop. Remove the four hex head
screws securing the pump motor to
the pump's volute and remove. The
check valve is located in the volute.
Rotate the check valve to release and
remove from the volute.
Reverse the above steps for reinstalling a check valve, however make
sure that the pump or volute has the
rubber o-ring in place before assembling.
HOT WATER
TO
HEATING
LOOP
TEE FITTING MUST
BE INSTALLED AS
SHOWN. REFER TO
INSTRUCTIONS FOR
DETAILS
TYPICAL PIPING SCHEMATIC
SUPPLY TO
HOUSE
HEATER
WATER SUPPLY
TO HOT WATER
HEATER
HOT
WATER
1
FLOW
FAN COIL UNIT
HOT WATER COIL
2
PUMP
FLOW
CHECK
VALVE
AIR
BLEED
VALVE
1) ISOLATION VALVE: SUPPLY LINE (FIELD SUPPLIED)
2) ISOLATION VALVE: RETURN LINE (FIELD SUPPLEID)
Figure 1
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STATE OF MASSACHUSETTS PIPING DIAGRAM
UNITS WITH HOT WA TER HEA TING
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