 SBD DIRECT GAS-FIRED SERIES
Engineers Specifications
Furnish and install the following Hastings direct gas-fired
make-up air system.
Blower Section:
- Blower wheels shall be statically and dynamically balanced
forwardly curved, double width, double inlet, class 1.
- Blower wheels shall be mounted on solid turned ground
shaft with keyway for driven shaft.
- Bearings shall be 200,000 hour ball bearing,
self-aligning, and greaseable, pillow -block or flange mounted.
- Blower housings, bearings and adjustable motor base shall be
mounted on a reinforced frame to insure rigidity and quiet operation.
- The driver and driven sheaves shall be of the keyed
hub type. The driven sheave shall be of a fixed pitch diameter and the driver sheave shall
be of a variable pitch diameter through 10HP and fixed pitch above 10HP. V-belt
drives shall be sized for 135% of motor horsepower.
- Cabinet shall be constructed of high quality (18) (16) (14)
gauge aluminized steel to insure long rust-free life.
- Access panels shall be provided to allow easy access to
motors and filters (if ordered.)
- Outside surface of cabinet shall be primed and finished with
a coat of enamel.
Burner Section :
- The burner shall be a direct gas-fired line burner suitable
for complete combustion of natural gas, propane or propane-air mixture, and having a
turndown ratio of up to 25:1 available.
- Burner combustion must be clean and odorless. Combustion
efficiency must limit the products of combustion to a maximum of 5 ppm carbon monoxide and
a maximum of 0.5 ppm nitrogen dioxide.
- The burner shall have stainless steel combustion baffles,
non-clogging gas ports, spark-ignited intermittent pilot and flame safeguard system.
- Observation port shall be provided in burner cabinet.
- Profile plates to control proper air velocity across
the burner shall be factory installed, adjusted during an actual firing test and
locked in place before shipment.
Motor :
An Energy Efficient (E.E) T-frame, ODP, 1800RPM
prelubricated ball bearing type motor shall be furnished for voltage as scheduled.
Gas and Electric Controls :
The following controls shall be furnished with the
direct gas-fired make-up air system:
| Main gas hand shut-off valve |
| Main and pilot gas pressure regulators |
| Pilot controls |
| Electric safety shut-off valve |
| Self-contained gas modulating valve for units with burner
capacity of 500 MBH or less |
| Electronic modulating gas valve with temperature
controller for units with burner capacity above 500 MBH |
| Electronic flame safeguard system |
| High temperature limit switch |
| Airflow switch |
| Ignition transformer |
| Automatic mild weather burner lockout |
| Motor starter |
| Control transformer |
| NEMA 1 control box |
| Remote control station with system switches and indicating
lights |
Assembly :
The system shall be factory assembled and wired with the
exception of controls that are remote to the unit.
Options and Accessories:
The following items are to be furnished (Insert desired
items from pages 5 and 6 of this bulletin.)
In order to maintain our policy of continuous product
improvement, we reserve the right to change prices, specifications, ratings, or dimensions
without notice or obligation.
|
