Enviro CFR, Руководство пользователя

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G
UIDE
S
PECIFICATIONS
• CFR
©May, 2006 Environmental Technologies, Inc. • CFR Catalog 31
PSIG working pressure at 200°F. Coils
shall incorporate a built in, flush
mounted access plate, allowing top and
bottom access to coil.
ELECTRIC HEATERS
Terminal shall include an integral elec-
tric heater where indicated on the plans.
The heater cabinet shall be constructed
of not less than 20 gauge galvanized
steel. Stainless steel cabinets, or gal-
vannealed steel casings with a baked
enamel paint finish, may be used as
an alternative. Heater shall have a
hinged access panel for entry to the
controls.
A power disconnect shall be furnished
to render the heater non-operational.
Heater shall be furnished with all con-
trols necessary for safe operation and
full compliance with UL 1995 and
National Electric Code requirements.
Heater shall have a single point elec-
trical connection. It shall include a
primary disc-type automatic reset high
temperature limit, secondary high
limit(s), Ni-Chrome elements, and fus-
ing per UL and NEC. Heater shall have
complete wiring diagram with label indi-
cating power requirement and KW
output. Heater shall be interlocked with
fan terminal so as to preclude opera-
tion of the heater when the fan is not
running.
OPTIONS
FOIL FACED INSULATION
Insulation shall be covered with scrim
backed foil facing. All insulation edges
shall be covered with foil or metal nos-
ing. Insulation shall meet ASTM
C1136 and ASTM C665 for mold,
mildew and humidity resistance.
DOUBLE WALL CONSTRUCTION
The terminal casing shall be double wall
construction using a 22 gauge galva-
nized metal liner covering all insulation.
LOW TEMPERATURE
CONSTRUCTION
Terminals shall be designed for use with
primary airflow temperatures as low
as 46°F and maximum ceiling plenum
conditions of 78°F and 60% R.H. In
addition to other design criteria, the
primary air valve shall be thermally iso-
lated from the terminal casing. The
damper shaft shall be made from
non-conducting thermoplastic com-
posite material. Metal shafts will not
be acceptable.
FILTERS
Terminals shall include a 1" thick dis-
posable fiberglass filter. Filter shall be
secured with quick release clips, allow-
ing removal without horizontal sliding.
ECM™ FAN MOTOR
Fan motor shall be ECM™. Motor shall
be brushless DC controlled by an inte-
gral controller / inverter that operates
the wound stator and senses rotor posi-
tion to electronically commutate the
stator. Motor shall be permanent
magnet type with near-zero rotor
losses designed for synchronous rota-
tion. The motor shall utilize
permanently lubricated ball bearings.
Motor shall maintain minimum 70%
efficiency over the entire operating
range. Motor speed control shall be
accomplished through a PWM (pulse
width modulation) controller specifi-
cally designed for compatibility with
the ECM™. The speed controller shall
have terminals for field verification of
fan capacity utilizing a digital volt meter.
A calibration graph shall be supplied
indicating Fan CFM verses DC Volts.
PIPING PACKAGES
Provide a standard factory assembled
non-insulated valve piping package to
consist of a 2 way, on/off, motorized
electric control valve and two ball iso-
lation valves. Control valves are piped
normally closed to the coil. Maximum
entering water temperature on the con-
trol valve shall be 200°F. The maximum
close-off pressure is 40 PSIG (1/2") or
20 PSIG (3/4"). Maximum operating
pressure shall be 300 PSIG.
Option: Provide 3-wire floating point
modulating control valve (fail-in-place)
in lieu of standard 2-position control
valve with factory assembled valve pip-
ing package.
Option: Provide high pressure close-
off actuators for 2-way, on/off control
valves. Maximum close-off pressure
is 50 PSIG (1/2") or 25 PSIG (3/4)".
Option: Provide either a fixed or
adjustable flow control device for
each piping package.
Option: Provide unions and/or pressure-
temperature ports for each piping
package.
Piping package shall be completely
factory assembled, including inter-
connecting pipe, and shipped separate
from the unit for field installation on
the coil, so as to minimize the risk of
freight damage.
CONTROLS
ANALOG ELECTRONIC CONTROLS
Refer to ENVIRO-TEC
®
Series 7000
Analog Electronic Controls Selection
Guide (Stock I.D. 7000-SELECTION)
for detailed guide specifications.
PNEUMATIC CONTROLS
Units shall be controlled by a pneumatic
differential pressure reset volume con-
troller. Controller shall be capable of
pressure independent operation down
to 0.03 inches W.G. differential pres-
sure and shall be factory set to the
specified airflow (CFM). Controller shall
not exceed 11.5 SCIM (Standard Cubic
Inches per Minute) air consumption @
20 PSIG.
Unit primary air valve shall modulate
in response to the room mounted ther-
mostat and shall maintain airflow in
relation to thermostat pressure regard-
less of system static pressure changes.
An airflow (CFM) curve shall be affixed
to the terminal unit expressing dif-
ferential pressure vs. CFM. Pressure
taps shall be provided for field use and
ease of balancing.
Terminal unit manufacturer shall sup-
ply and manufacture a 5 to 10 PSIG
pneumatic actuator capable of a min-
imum of 45 in. lbs. of torque.
Actual sequence of operation is shown
on the contract drawings. Terminal unit
manufacturer shall coordinate, where
necessary, with the Temperature Con-
trol Contractor.