Technical Guide

5126749-YTG-A-0715
6 Johnson Controls Unitary Products
REFRIGERANT COMPONENTS
• Protected Compressor - The compressor shall be a fully
hermetic type, direct drive compressor, that is internally pro-
tected against high pressure and temperature. This is
accomplished by the simultaneous operation of high pres-
sure relief valve and a temperature sensor which protect the
compressor if undesirable operating conditions occur. The
hermetic motor shall be suction gas cooled and have a volt-
age range of +/- 10% of the unit nameplate voltage. Com-
pressors shall have internal isolation and sound muffling to
minimize vibration and noise, and be externally isolated on a
dedicated, independent mounting.
• Indoor Coils - Indoor coils shall be of the direct expansion,
draw through design and have aluminum plate fins mechani-
cally bonded to seamless internally enhanced tin-coated
copper tubes with all joints brazed.
• Condensate Pan - A corrosion-resistant, long-lasting, water-
tight pan is positioned below the indoor coil to collect and
drain all condensate, preventing build-up of stagnant con-
densate. The condensate pan conforms to ASHRAE 62-89
standards (Ventilation for Acceptable Indoor Air Quality).
• Condensate Drain - The 3/4 inch NPT female connection is
rigidly mounted to assure proper fit and leak tight seal.
• Outdoor Coils - Outdoor coils shall have aluminum plate fins
mechanically bonded to seamless internally enhanced cop-
per tubes with all joints brazed, and be a draw through
design.
Refrigerant Circuit and Refrigerant Safety Components
shall include: Thermal expansion devices (TXV's) shall be
factory mounted and provided, Filter/strainer to eliminate any
foreign matter, reversing valves to control refrigerant flow.
CONTROLS
• Simple Control Circuit - Field thermostat wiring connects to
color coded leads using twist on wire connections. Cooling
controls use contactor and relays for simple application and
troubleshooting. Mate-n-lock plug connectors are used. The
electrical control box is not located in the compressor com-
partment. The controls are mounted to allow the separate
access panel to be removed for trouble shooting and mainte-
nance without affecting the normal system operating pres-
sures. All wiring internal to the unit is color/number coded.
• Pressure Switches - A high pressure switch is standard in
all units. It is an automatic reset switch. When discharge
pressure reaches 650 psi, the compressor will de-energize
until pressure reaches 450 psi.
• Factory Testing - Installation time and costs are reduced by
easy power and control wiring connections. All units are
completely wired, charged with R-410A and tested prior to
shipment. Test stations using a state-of-the-art computerized
process system shall be used to insure product quality.
Refrigerant charge and component part numbers are verified
via computer bar code scans during assembly. Vital run test
statistics such as system pressure, motor currents, air veloc-
ity and temperature, unit vibration, and gas system safeties
are monitored and recorded by the system to insure unit per-
formance. This data could be provided by serial number
tracking if requested.
• Electric Heat - All electric heat models use 6HK electric
heat, which are available in 230v/1/60 from 2 kW to 25 kW,
230v/3/60 10kW to 25kW, and 460v/3/60 10kW to 25kW.
Most kits stageable above 10 kW. Single point accessory kits
are available for single phase models. Single phase single
point field wiring kits are available for all applications except
25kW. Electric heat kits must be certified to UL 1995 stan-
dard requirements.