Allied A80US2VX - User Manual

508033-02 Issue 2135 Page 1 of 48
SERVICE MANUAL
A80US2VX Gas Furnace
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
(P) 508033-02
*P508033-02*
Table of Contents
Technical Specications ..............................................2
Blower Performance ....................................................3
Parts Arrangement.......................................................5
Unit Components .........................................................6
Indoor Blower Motor ..................................................20
Heating Components .................................................24
Placement and Installation ........................................27
Start-Up .....................................................................27
Heating System Service Checks ...............................28
High Altitude ..............................................................30
Typical Operating Characteristics ..............................31
Maintenance ..............................................................32
Wiring and Sequence of Operation ...........................34
Program Unit Capacity Size Modes...........................43
Troubleshooting .........................................................44
A80US2VX series units are 80% e󰀩ciency gas
furnaces used for upow or horizontal applications only,
manufactured with heat exchangers formed of aluminized
steel. A80US2VX units are available in heating capacities
of 40,000 to 100,000 Btuh and cooling applications up to
5 tons. Refer to Engineering Handbook for proper sizing.
Units are approved for installations up 7500 ft and factory
equipped for use with natural gas only. A80US2VX model
units are equipped with the Comfort Sync
®
enabled
SureLight
®
two-stage variable speed integrated control.
A80US2VX unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal E󰀩ciency
requirements. All units use a redundant gas valve to assure
safety shut-o󰀨 as required by C.S.A.
All specications in this manual are subject to change.
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace
local or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual
(except where noted) are recommendations only and do
not constitute code.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
WARNING
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.
CAUTION

Allied A80US2VX Specifications