Contractor:
P.O.:
Engineer:
Project Name:
Unit Tag:
The manufacturer works continually to improve its products. As a result, the design and speci
fi
cations of each product at the time of order may be changed without notice. Purchaser’s approval of this data set signi
fi
es that the equipment is acceptable under the provisions
of the job speci
fi
cation. Statements and other information contained herein are not express warranties and do not form the basis of any bargain between the parties, but are merely the manufacturer’s opinion or commendation of its products. York and Af
fi
nity are registered
trademarks of Johnson Controls, Inc., and are used with permission.
Engineering Guide Speci
fi
cations cont.
SD2500AG 05/21
63
Page _____ of _____
Aston Series
1 - 6 Tons 60Hz
Blower Motor and Assembly
The blower shall be a direct drive centrifugal type with a
dynamically balanced wheel. The housing and wheel shall be
designed for quiet low outlet velocity operation. The blower
housing shall be removable from the unit without disconnecting
the supply air ductwork for servicing of the blower motor. The
blower motor shall be a 3-speed PSC, 5-speed ECM, or variable-
speed ECM type. The variable speed ECM blower motor shall be
soft starting, shall maintain constant cfm over its operating static
range, and shall provide 12 cfm settings. An optional constant
torque 5-speed ECM is available on model sizes 022-072. An
optional 3-speed PSC blower motor is available on all single speed
models. The blower motor shall be isolated from the housing by
rubber grommets. The motor shall be permanently lubricated and
have thermostatic overload protection. Variable speed ECM and
5-speed ECM motors shall be long-life ball bearing type.
Electrical
A control box shall be located within the unit compressor
compartment and shall contain a 75VA transformer, 24 volt activated,
2 pole compressor contactor, circuit breakers for protecting loop
pumps, terminal block for thermostat wiring, and solid-state controller
for complete unit operation. Electromechanical operation WILL NOT
be accepted. Units shall be name-plated for use with time delay fuses
or HACR circuit breakers. Unit controls shall be 24 volt and provide
heating or cooling as required by the remote thermostat/sensor. An
Aurora, a microprocessor-based controller, interfaces with a multi-
stage electronic thermostat to monitor and control unit operation
shall be provided. The control shall provide operational sequencing,
blower speed control, blower failure, high and low pressure switch
monitoring, freeze detection, hot water limit thermistor sensing,
condensate overflow sensing, auxiliary heat staging, lockout mode
control, hot water and loop pump control, LED status and fault
indicators, fault memory, field selectable options, and accessory
output. The Lockout signal output shall have a pulsed option so that
DDC systems can read specific lockout conditions from the control.
The optional Aurora Advanced Control shall also feature an
Energy Monitoring Package that will provide real time total power
consumption, compressor monitoring, On Peak input signal for
utility controlled demand programs, intelligent hot water generation
with user adjustable temperature limit, loop pump linking for
multiple units driving a common flow center and up to two optional
home automation inputs to drive dedicated alarms for sump
pump, security system, and smoke/CO2 or dirty air filter sensors.
Optional Refrigerant and Performance Monitoring kits to provide
real time data including refrigerant superheat and subcooling, as
well as heat of extraction/rejection capacity data. The capability for
communicating to advanced IntelliZone2 zoning packages with up
to 6 zones (Variable Speed), 4 zones (Dual Capacity), or 2 zones
(Single Speed) shall also be provided with complete fault and
information display on the zoning MasterStat.
A detachable terminal block with screw terminals will be provided
for field control wiring. All units shall have knockouts for entrance
of low and line voltage wiring. The blower motor and control box
shall be harness plug wired for easy removal.
An optional Aurora Interface Diagnostic (AID) Tool shall
communicate with the Aurora control allowing quick and easy
access to setup, monitoring, and troubleshooting of any Aurora
control. The device shall include the features of ECM airflow setup,
fault description and history, manual operation capability, sensor
readings, timings, and other diagnostic tools.
Optional IntelliStart
®
(compressor Soft Starter) shall be factory
installed for use in applications that require low starting amps,
reduced compressor start-up noise, off-grid, and improved start-
up behavior. IntelliStart shall reduce normal starting current by up
to 60%.
Piping
Supply and return water connections shall be 1 in. [25.4 mm] FPT
brass swivel fittings, which provide a union and eliminate the need
for pipe wrenches and sealants when making field connections. The
optional hot water generator shall have sweat type connections. All
water piping shall be insulated to prevent condensation at low liquid
temperatures, on the vertical units, the condensate connection shall
be a 3/4 in. [19.1 mm] PVC socket with internally-trapped hose that
can be routed to front or side locations.
Hanger Kit
(field-installed horizontal units only)
The hanger kit shall consist of galvanized steel brackets, bolts,
lock washers, and isolators and shall be designed to fasten to the
unit bottom panel for suspension from 3/8-inch threaded rods. Unit
sizes 012-030 shall include four brackets. Unit sizes 036-072 shall
include six brackets.
Options and Accessories
Cupronickel Heat Exchanger
An optional cupronickel water-to-refrigerant heat exchanger shall
be provided.
Hot Water Generator
An optional ThermaShield coated heat reclaiming hot water
generator coil of vented double-wall copper construction suitable
for potable water shall be provided. The coil and hot water
circulating pump shall be factory mounted inside the unit with
integral electronic high limit temperature monitoring and external
on/off switch.
5-Speed ECM Blower Motor
An optional constant torque 5-speed ECM blower motor is
available on model sizes 022-072.
PSC Blower Motor
An optional 3-speed PSC blower motor is available on all single
speed models.
