First Co CDXQ Uncased with pump (HW) - Manual (Page 2)

The following are some precautions to
be followed for typical installations.
• Always use proper tools and equip-
ment.
• No wiring or other work should be
attempted without first ensuring that
the fan coil is completely discon-
nected from the power source and
locked out. Always verify that a good
ground connection exists prior to en-
ergizing any power sources.
• Always review the nameplate on
each unit for proper voltage and con-
trol 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 dam-
age.
• When the fan coil unit is in opera-
static rating of the unit.
COOLING COIL PIPING
The CDXQ fan coil units are sup-
plied with a direct expansion refriger-
ant coil. The refrigerant metering
device is a fixed orifice piston and is
installed at the factory. This permits
the unit to be matched with either a
standard condensing unit or heat
pump. The suction and liquid refriger-
ant lines must be sized in accordance
with the outdoor unit manufacturer’s
recommendations.
Condensate drain lines must be
installed with adequate slope away
from the unit to assure positive drain-
age. 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 should be provided in the drain
line to assure proper drainage. The
fan coil unit may be located where the
return air space is large enough that a
negative pressure is not present,
however, a trapped condensate line is
recommended in case a negative
condition should occur, the unit would
drain properly.
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.
HOT WATER COIL
PIPING PRECAUTIONS
•
Flush all field piping prior to connec-
tion to remove all debris.
• Use wet cotton rags to cool valve
bodies when soldering.
• Open all hand valves midway 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 connec-
tions are complete the system must
be pressure tested. Repair any sol-
der joint leaks and gently tighten any
leaking valve packing nuts and piping
accessories as required. Water sys-
tems are not designed to hold pres-
surized air and should only be tested
with water.
NOTE: A water heater is designed to
produce hot water. Hot water repre-
sents a serious safety hazard due to
potential scalding. The temperature
of water normally required to provide
space heating (135 to 140 degrees)
may be hotter than certain codes
allow for domestic hot water. An “anti-
scald valve” can be installed in the hot
water piping that would allow the do-
mestic water to be supplied at a lower
temperature than the space heating
water. These can be obtained locally
and should be installed according to
the manufacturer’s installation in-
structions.
HOT WATER COIL PIPING
The hot water coil connections are
1/2” inch nominal (5/8” OD) copper.
All piping between the water heater
and fan coil unit should be 3/4” nomi-
nal (7/8” OD) to prevent excessive
head pressure losses and should not
exceed 200 feet of total piping. (Con-
sult the factory for other piping appli-
cations.)
It is also recommended that all
piping be adequately insulated to pre-
****** WARNING ******
Do not touch any rotating
component with any object.
Damage to the equipment and
personal injury can occur.
tion components are rotating at high
speeds.
• Units must be installed level to
ensure proper drainage and opera-
tion. These fan coils have a pitched
drain pan for improved condensate
drainage.
• 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 re-
quired 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 sys-
tem does not exceed the external
****** WARNING ******
An expansion tank may be
required if a back-flow
preventer is installed in the
system.
****** 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 water leak
when water pressure is ap-
plied to the system.