Sterling VS - Manual (Page 3)

3
Failure to comply with the general
safety information may result in extensive property
damage, severe personal injury or death.
Do not alter the unit heater in any
way or damage to the unit and/or severe personal
injury or death may occur!
Disconnect all power supplies
before installing or servicing the heater. If the
power disconnect is out of sight, lock it in the
open position and tag it to prevent unexpected
application of power. Failure to do so could result
in fatal electric shock, or severe personal injury.
Ensure that all power sources
conform to the requirements of the unit heater
or damage to the unit will result!
Follow installation instructions CAREFULLY to avoid
creating unsafe conditions. All external wiring must
conform to applicable current local codes, and to the
latest edition of the National Electric Code, ANSI/NFPA
No. 70. In Canada, all external wiring must conform
to the Canadian Electric Code, Part 1 CSA Standard
C22.1. All wiring should be done and checked by a
qualifi ed electrician, using copper wire only. All steam
or water connections should be made and leak-tested
by a suitably qualifi ed individual, per instructions in
this manual. Also follow procedures listed on the “Unit
Equipment Start-Up Sheet” located in this manual.
Make certain that the power source conforms to the
electrical requirements of the heater.
Do not depend upon a thermostat
or other switch as sole means of disconnecting
power when installing or servicing heater. Always
disconnect power at main circuit breaker as
described above. Failure to do so could result in
fatal electric shock.
Special attention must be given to any grounding
information pertaining to this heater. To reduce the risk of
electrocution, the heater must be securely and adequately
grounded. This should be accomplished by connecting a
grounded conductor between the service panel and the
heater. To ensure a proper ground, the grounding means
must be tested by a qualifi ed electrician.
GENERAL SAFETY INFORMATION
1 inch water column = 0.249 kPa
meter/second = FPM ÷ 196.8
liter/second = CFM x 0.472
1000 Btu per hour = 0.293 kW
1000 Btu/Cu. Ft. = 37.5 MJ/m
3
1 cubic foot = 0.028 m 3
To meet ETL and OSHA requirements, units mounted
below 8 feet from the fl oor must be equipped with an
OSHA fan guard.
Do not insert fi ngers or foreign objects into the heater
or its air moving device. Do not block or tamper with the
heater in any manner while in operation or just after it
has been turned off, as some parts may be hot enough
to cause injury.
It is recommended to install a shutoff switch in the electri-
cal power lines at the heater. Whenever a unit is serviced,
shut power off to the unit.
Since these units are installed in most instances higher
than 8 feet, proper type of ladders or scaffolding should
be used, as set up by OSHA requirements; see notice
on page 2. Never place a ladder against the unit for sup-
port.
In industrial plants, professional maintenance crews
should service this equipment.
All Vertical Unit Heaters are shipped fully assembled and
may be used for steam or hot water applications. Coils
are factory tested at 400 psig air under water. Fans are
balanced and motors are prelubricated.
Each unit is packaged individually and marked for proper
identifi cation. Use normal care in handling and during
installation to prevent damage to the coils fi ns, fan and
casing. Do not set Vertical Unit Heater on fl oor with the
weight of the unit resting against the fan blades. In this
position, the blades may be damaged.
Unless otherwise specifi ed, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m
1 inch = 25.4 mm
1 psig = 6.894 kPa
1 pound = 0.453 kg
1 gallon = 3.785 L