349687-JTG-A-1007
Johnson Controls Unitary Products
5
with aluminized steel or optional stainless steel tubes, a
redundant gas valve, spark ignition, power venting, an
ignition module for 100% shut-off and all of the safety
controls required to meet the latest ANSI standards.
The gas supply piping can be routed into the heating
compartment through a hole in the base pan of the unit
or through a knockout in the piping panel on the front of
the unit.
•
Electric Heat Operation
- All electric heat models (fac-
tory installed only) are wired for a single power source
and include a bank of nickel chromium elements
mounted at the discharge of the supply air blower to pro-
vide a high velocity and uniform distribution of air across
the heating elements. Every element is fully protected
against excessive current and temperature by fuses and
two thermal limit switches.
The power supply wiring can be routed into the control
box through a threaded pipe connection in the base pan
of the unit or through a knockout in the wiring panel on
the front of the unit.
FACTORY-INSTALLED OPTIONS
•
SINGLE INPUT ELECTRONIC ENTHALPY ECONO-
MIZERS
- Includes a slide-in / plug-in damper assembly
with fully modulating spring-return motor actuator capa-
ble of introducing up to 100% outdoor air with nominal
1% leakage type dampers.
The enthalpy system contains one sensor that monitors
the outdoor air and determines when the air is cool
enough and dry enough to provide free cooling.
The rainhood is painted to match the basic unit and must
be field-assembled before installing.
•
BAS-READY ECONOMIZER
- Includes a slide-in / plug-
in damper assembly with fully modulating spring-return
motor actuator with zero to 95-degree rotation capable of
introducing up to 100% outdoor air with nominal 1% leak-
age type dampers.
Actuator requires 2-10 VDC input from an external
source, such as a field-installed or factory-installed BAS
controller. BAS-ready actuators have an adjustable auxil-
iary end-switch for optional power exhaust control.
For units with optional VAV control, a factory-installed,
dry bulb sensor determines if outdoor air temperature is
low enough to provide free-cooling operation. (Field-
installed humidity sensors for either outdoor air or out-
door & return air streams are available for single
enthalpy and differential enthalpy configurations, respec-
tively).
The rainhood is painted to match the basic unit and must
be field-assembled before installing.
FIGURE 1 - UNIT CUTAWAY
UNIT
