036-21363-002-B-0303
Unitary Products Group
11
ACCESSORIES (FIELD-INSTALLED)
Three-Phase Electric Heaters are available in several
capacities to provide maximum flexibility. The heater
can be selected to precisely meet the supplemental
heating requirement of the conditioned space.
These heaters are designed for easy field-installation
over the supply air opening of the indoor unit. They
have been tested by Underwriters' Laboratories and
will be shipped with a UL label. Every heater will be
fully protected against excessive current and tempera-
ture by fuses and two high limit thermostats.
Units with Electric Heat will require only one power
supply for both the heating elements and the supply air
blower motor, and the power wiring can be protected
by either dual element/time delay fuses or an inverse
time circuit breaker.
Supply Air Plenums and Return Air Grilles (expanded
metal) are available for free-standing indoor units
located in the conditioned space. Both accessories are
finished to match the exterior of the basic unit, and both
can be applied with either vertical or horizontal units.
The supply air plenums are fully insulated and have
double-deflection, adjustable grilles.
Base Sections are available to raise vertical indoor
units above the floor. Outdoor air may be introduced
through these bases by cutting an access opening for
the outdoor air duct connection. These bases are fin-
ished to match the exterior of the basic unit. They may
have to be insulated in the field for certain applications.
Decorative Coil Guards can be field installed to
enhance protection of the unit.
Thermostats with either manual or automatic
changeover are available for precise control of the tem-
perature within the conditioned space. The manual
thermostat has a four-position selector switch - COOL,
OFF, HEAT, and EMERGENCY HEAT, and three
stages of control - one stage of cooling and two stages
of heating. The automatic thermostat has a three-posi-
tion selector switch - OFF, AUTOMATIC and EMER-
GENCY HEAT, and four stages of control - two stages
of cooling and two stages of heating.
Both thermostats have a two-position fan switch,
AUTO and ON to provide intermittent or continuous
blower operation.
NOTE: The automatic changeover thermostat must be
used on units equipped with a field-supplied
economizer.
The first cooling stage of the automatic ther-
mostat will only control the position of the
reversing valve; the system will still operate
with only one stage of cooling.
The EMERGENCY HEAT position on the selector
switch and the second stage of heating will only func-
tion on systems with an electric heat accessory.
TABLE 9: STATIC RESISTANCES FOR UNIT ACCESSORIES (IWG)
UNIT MODEL
ACCESSORY
CFM
3200
3600
4000
4400
4800
FF-10
ELECTRIC HEAT
10
KW
0.02
0.02
0.03
0.03
0.04
16
KW
0.03
0.04
0.05
0.06
0.07
26
KW
0.06
0.07
0.09
0.11
0.13
36
KW
0.09
0.11
0.14
0.17
0.20
SUPPLY AIR PLENUM
0.05
0.06
0.07
0.08
0.10
RETURN AIR GRILLE
0.05
0.06
0.07
0.08
0.10
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