|
|
|
|
|
|
|
| TYPICAL SPECIFICATIONS |
| Model: |
RE |
|
| Description: |
An Electric heating and ventilating unit(s), as indicated on the
drawings shall be furnished. Orientation shall be horizontal (Down) (Side)
discharge. Unit(s) shall be factory assembled, tested and shipped as a
complete packaged assembly, for indoor or outdoor mounting, consisting
of the following:
|
| |
- electric insert;
- centrifugal blower (forward-curved double width/double inlet);
- motor starter with thermal overload protection;
- motor and drive assembly;
- airflow switch and blower interlock safety equipment, and
- temperature control system.
|
|
| Approvals: |
Unit(s) shall be factory tested, and the electric coil
shall bear the UL label.
|
|
| Construction: |
|
| Housing |
|
Unit housing shall be constructed of 20 Gauge G-90
galvanized steel. The wall panels and roof panels shall
be fabricated by forming double-standing, self-locking
seams that require no additional support. The floor and
wall panels shall be caulked air tight with a silicone
caulk. All casing panels shall be attached with sheet-metal,
screws or rivets which can be removed to field service large
components. The unit base shall be suitable for curb or flat
mount. Housing construction should be suitable for outdoor or
indoor installation.
An observation port shall be located on the exterior
of the unit for observation of the coil.
All controls, and electrical components shall be mounted within
the control vestibule. The vestibule shall be an integral part
of the unit and not extend outside the exterior casing of the
unit and not exposed to the main air stream.
The vestibule full-size door shall provide easy access to
controls. Blower door shall provide easy access to blower,
motor and drives. Access doors shall be provided on both
ends of the unit providing full access to every part of
the unit.
|
|
| Base |
|
The base shall be constructed of galvanized steel for improved rigidity.
Base shall be structurally reinforced to accommodate the blower assembly
and burner.
|
|
| Blower |
|
Blower(s) shall be forward-curved, centrifugal, Class I or II, (depending on
requirements of the application) double width, double inlet,
constructed G-90 galvanized steel. Unit shall have
a heavy-duty, solid-steel shaft. Wheels shall be balanced in two planes and
done in accordance with AMCA standard 204-96, Balance Quality and Vibration
Levels for Fans. The wheel blades shall be aerodynamically designed to minimize
turbulence, increase efficiency and reduce noise. The wheel blades shall be
securely attached to the wheel inlet ring. The wheel shall be firmly attached
to the fan shaft with set screws and keys. The blower assembly shall be
isolated from the fan structure with vibration isolators.
Blower capacity shall be _____ CFM at 70 degrees F standard air, ____ external
static press.
External Static: The sum of duct loss plus duct component static- Example:
louvers, diffusers. All blowers shall be tested and set at rated speed after
being installed in the factory-assembled unit.
|
|
| Motor & Motor Compartment |
|
Motors shall be heavy duty ball bearing type and furnished at the
specified voltage, phase and enclosure. Motor mounting plate shall
be constructed of heavy gauge galvanized steel and shall be designed
to provide easy adjustment of belt tension. Blower motor shall be suitable
for operation on _______ volts, _______ cycle, _____ phase power. Blower motor
shall be a ___________________________ HP motor, Open Drip Proof.
|
|
| Shaft & Bearings |
|
Shafts shall be precision ground and polished. Heavy duty, pre-lubricated
bearings shall be selected for a minimum (L50) life in excess of 200,000
hours of operation at maximum cataloged operating speed. They shall be designed
for, and individually tested specifically for use in air handling applications.
|
|
| Belts & Drives |
|
Belts shall be oil and heat resistant, non-static, grip-notch type. Drives
shall be cast type, precision machined and keyed and secured attached to the
fan and motor shafts. Fan operating speed shall be factory set using adjustable
pitch motor pulleys. Blower drives shall be fully adjustable. All drives shall
be a minimum of 2 groove above 2 HP.
|
|
| Electric Coil |
|
The electric coil shall be sized to provide an output of ________ KW.
The electric heater shall be capable of heating the entire air supply
from _____F° to _____F° ( ______ degrees F temperature rise).
Rear access doors or a removable lid will provide complete access to
burner and pilot assembly.
|
|
| SAFETY CONTROLS |
| Standard |
- motor starter with adjustable overloads
- air-flow safety switch
- blower interlock relay
- high-temperature limit switch
- Non-Fused Disconnect
- Casing insulation shall be 1” x 1.5# density with a foil face
|
|
| Optional |
- Adjustable low temperature blower-safety control with bypass timer to shut down unit, if discharge temperature drops below setting.
- Operating lights mounted in a remote-control panel to indicate: power, heat ON and blower ON.
|
|
| ACCESSORIES |
- Inlet Dampers:
Manufacturer shall provide and install on unit, when possible, a two-position,
motor-operated damper with internal end switch to energize the blower-starter
circuit, when damper is 80% open. Blades shall be a maximum of 6” wide 16 Gauge
G-90 galvanized steel shall be made to guarantee the absence of noticeable vibration
at design air velocities. Damper blades to be mounted on friction-free synthetic
bearings. Damper edges shall have PVC coated polyester fabric mechanically locked
into blade edge. Jamb seals to be flexible metal, compression type.
- Filters:
The filters shall be (2") thick, aluminum mesh, coated with super-filter
adhesive. Aluminum-mesh filters shall have aluminum frames with media to be
layers of slit and expanded aluminum, varying in pattern to obtain maximum
depth loading. Washable 2" filters shall be enclosed in two-piece, die-cut
frame with diagonal supports. Frame shall be constructed of heavy-duty beverage
board. Filter media is supported on the air leaving side by a metal grid.
Filter Section: shall be (insulated) (uninsulated)
constructed of G-90 galvanized steel with filters supported by internal slides
and with removable access panels. Filters shall be provided in a v-bank
arrangement.
- Fresh-Air Inlet Hood: Shall be constructed of G-90 galvanized
steel with birdscreen.
- Fresh-Air Inlet Hood/Filter Combination:
Shall be constructed of G-90 galvanized steel with birdscreen and (2")
cleanable filters supported by internal slides mounted in the inlet
face of the hood.
- Discharge Diffusers:
Shall be constructed of G-90 galvanized steel with horizontal and
vertical blades capable of four-way diffusion.
- Curb: 20" curb shall be constructed of 18 ga G-90
galvanized steel as a completed welded assembly.
- Cooling Coil Section: Cooling coil section shall be
bolted directly to discharge of blower section. Coil section to be
designed to fit onto common curb with main unit. Base of coil section
to be constructed same as main unit with double pitch stainless steel
drain pan for coil. Casing and roof to be 20 ga. G-90 galvanized
construction. Inside of section to be fully insulated with foil back
insulation. DX or chilled water coil to meet scheduled requirements.
|
|
| TEMPERATURE CONTROL SYSTEMS |
|
Discharge Air temperature controls shall be shipped as a standard feature on
all electric heaters. Optional room controls shall be available.
|
|
| WIRING AND ELECTRICAL |
|
The control circuit voltage shall be 115 volts. A control transformer shall be
provided, when required. The control wiring shall be carried in wire channel or
conduit. Wiring in control enclosures shall be in accordance with the National
Electrical Code and the local code, as it may affect the installation. Motor
starter shall be provided. Starter shall be line voltage, definite purpose type.
Unit(s) shall be complete with all items such as relays, starters, switches,
safety controls, conduit and wire as previously mentioned, and as required for
proper operation. All factory-mounted controls shall be factory prewired to the
unit control panel.
|
|
| FACTORY TESTED |
|
Unit(s) shall be operated, tested and set at the factory using job-site
conditions for electrical and gas input. All operating and safety controls
shall be tested and set at the factory. Adjustable, or fixed sheaves shall
be set for proper RPM at specified conditions.
|
|
| SERVICE AND PARTS |
|
The supplier shall furnish as built wiring
connection and control-circuit diagrams, dimension sheets and a
full description of the unit(s). Service manuals, showing service
and maintenance requirements, shall be provided with each unit.
|
|
|
|
Sign In
