Specifications

literature supplement
Form No.:
Supersedes:
File with:
Subject:
102.20-N1 (LS01)
New Release
102.20-N1 (1108)
102.20-NOM1(105)
Installation, Operating and Maintenance Instructions for Electric Heat Applications in Air Handling
Products. (Listed or Certied to UL 1995.)
509
Rotating parts and electrical shock
hazards exist. Lock out and tag out
the fan motor(s) and heat power
disconnects before servicing. FOL-
LOW THE LATEST “LOCKOUT
TAGOUT” PROCEDURE. Failure to
follow proper safety precautions may
result in serious injury or death
APPLICATION INFORMATION
1. Follow the procedure given in this instruction to
nd the minimum air velocity for safe operation
(see Fig. 1). At least this minimum velocity must
be provided at all points over the heater face area.
Failure to meet this requirement may result in seri-
ous damage or nuisance thermal cutout tripping.
2. The maximum air inlet temperature for open coil
heaters is 100° F, and for nned tubular heaters,
80° F.
3. Sufcient working space must be provided per
paragraph 110-26 of the NEC.
4. This electric heater is not designed for or intended
to be used for temporary heat prior to system
startup / balancing.
MECHANICAL INSTALLATION
1. All heaters will contain an adjustable airflow
switch in the heater control panel. This switch
will be preset to close at a differential pressure of
approximately 0.3" W.C. In all cases the switch
will be connected to a pressure probe positioned
in the airstream. This probe has an arrow stamped
on it that is viewable from inside of the control
panel. When the heater is located upstream of the
fan this arrow will point away from the fan. When
the heater is located on the downstream side of
the fan the arrow will again point away from the
fan or with airow. If it is incorrectly installed,
remove the (2) screws holding the pressure probe
in place and rotate 180° and reinstall. The airow
switch pressure port that is not connected to this
pressure probe will be run to the exterior of the
air handling unit to source a reference differential
pressure. In some situations it may be necessary
to adjust this airow switch setting to allow for
proper operation. Precautions must be made at
this time to make sure that the airow switch does
not provide a false indication of airow. Failure to
meet this requirement may result in serious damage
or nuisance thermal cutout tripping.
2. A visual inspection of the heater elements should
be made prior to use of the heater. If physical
damage is evident, a Megohm test should be used
to validate the heater elements are safe for use. If
a minimum value of 10 megohms is not achieved
then any damaged elements or ceramic insulators
must be replaced prior to operation.
ELECTRICAL INSTALLATION
1. Follow the wiring diagram on the inside of the
terminal box.
2. Supply connections must be made with copper
wiring rated for 75° C minimum.
3. If supply connections are for 250 volts or greater,
all wiring must be insulated for 600 volts.
4. When making line connections to heater element
terminals FOR FINNED TUBULAR HEATERS
ONLY, apply a 1/4" wrench to at section of termi-
nal immediately below threads. Otherwise damage
to terminal may result.