Factory-Installed Option; Field-Installed Accessories - York D1HE/D1HG036 Technical Manual

troubleshooting without affecting the normal system operat-
ing pressures.
AIR FILTERS - Units are shipped with 1" throwaway filters.
The unit filter racks can accommodate 1" or 2" filters without
any modifications

FACTORY-INSTALLED OPTION

ECONOMIZERS: Units equipped with a factory-installed
economizer option have dampers that are positioned by a
spring return, fully modulating damper actuator and are capa-
ble of introducing up to 100% outdoor air. As the outdoor air
intake dampers open, the return air dampers close. The
changeover from mechanical refrigeration to economizer
operation is determined by a single input electronic enthalpy
control or by a dual input electronic enthalpy control. Simulta-
neous compressor and economizer operation is also possi-
ble.
The single enthalpy system contains a sensor that monitors
the outdoor air which automatically operates the damper
actuator allowing the dampers to open or close.
The dual enthalpy system contains a second sensor that
monitors both the temperature and the humidity of the return
air in addition to the outdoor air sensor described for a single
enthalpy system. The logic module compares the inputs from
both sensors and switches to economizer operation when-
ever the outdoor air is cooler than the return air for maximum
efficiency of the economizer system.
The economizer is completely wired and installed at the fac-
tory. Only the outdoor air hood, including its filters, need be
assembled and installed in the field.

FIELD-INSTALLED ACCESSORIES

SINGLE INPUT ELECTRONIC ENTHALPY ECONOMIZER -
Includes a slide-in / plug-in damper assembly with fully modu-
lating spring return motor actuator capable of introducing up
to 100% outdoor air, one outdoor air electronic enthalpy sen-
sor and a rain hood with filters. The rain hood is painted to
match the basic unit and must be field-assembled before
installation. Economizer dampers are 2% low leakage type.
DUAL INPUT ELECTRONIC ENTHALPY ECONOMIZER -
Includes the same damper system and rain hood with filters
as described for a single enthalpy economizer except this
accessory contains two enthalpy sensors. It uses a differen-
tial enthalpy control that compares the outdoor air versus the
return air. The logic module then optimizes the economizer
operation for additional savings over the single input econo-
mizer.
MOTORIZED AIR DAMPER - Includes a slid-in/plug-in
damper assembly with a rainhood and filters. The outdoor air
dampers open when the indoor fan motor is energized. The
damper is capable of providing 0% through 100% of outdoor
return air opening.
4
MANUAL OUTDOOR DAMPER - Provides 0% through 35%
or 0% through 100% of return air opening (field adjustable).
Designed for duct mounted side or bottom supply/return
applications. Includes rain hood assembly and filter.
ELECTRIC HEATERS - Include nickel chromium elements, a
terminal block, fuses (where required by UL), all the neces-
sary connectors and hardware. All heaters utilize single point
power supply hookup. Capacities from 5 KW thru 30 KW
heating are available.
FUSE BLOCK KITS - These kits have a fuse box with a fuse
block and fuses. They're available for all 460-3-60 volt heat-
ers and 208/230-3-60 volt heaters 7 KW and smaller.
OUTDOOR THERMOSTAT - A 24-volt thermostat providing
two stages of control for units equipped with electric heat
accessories.
ROOF CURB - This 14" high full perimeter roof curb is
shipped knocked down for field assembly and contains duct
supports that can easily be
shifted for the desired unit duct arrangement. No insulated
deck is required because the unit underside is insulated.
START ASSIST KIT - Provides increased starting torque for
single phase units in areas with low voltage conditions. It con-
tains a 12.5 OHM PTCR temperature resistor with a support
clip and hardware for mounting.
LOW AMBIENT KIT - A head pressure controller maintains
stable system operation by reducing the speed of the con-
denser fan motor when the outdoor temperature is between
45 and 0F. Condenser fan motors with ball bearings and
heavier windings are also available for these low ambient
applications.
ANTI-RECYCLE TIMER - A timer to prevent the unit com-
pressor from short cycling. It assures a 5-minute off-time
between compressor cycles.
PROPANE CONVERSION KIT - Converts a gas-fired heater
from natural gas to propane. It contains main burner orifices,
a pilot orifice and a regulator spring.
LOW NOx KIT (natural gas furnaces only) - Contains five
stainless steel expanded metal sheets for mounting into the
heat exchanger tubes to meet the California low nitrous oxide
emission requirements.
HIGH ALTITUDE CONVERSION (NATURAL AND PRO-
PANE) - Provides orifices for proper furnace operation at alti-
tudes up to 6000 feet. For propane applications, the propane
conversion kit will also be required.
GAS PIPING - This kit contains 1/2" pipe nipples, fittings and
gas cock (including panel access gaskets) required for bot-
tom gas supply connection with external shut-off.
OUTDOOR COIL GUARD - Consists of grille-type sections
for installation over the outdoor coil to protect it from damage.
036-21216-003-A-0204
Unitary Products Group