High Altitude Derate - American Standard UY060R9V3W Series Installer's Manual

Installer's Guide
Connection of the pipe and collar of the combustion air inlet
should just be a friction fit. It is recommended that the inlet
air joint be sealed with RTV type sealant to allow the joint to
be separated for possible future service. The inlet and vent
pipes must be properly supported throughout the entire
length.
Connection of the vent pipe to the vent collar should also be
accomplished using RTV type sealant. This type sealant
provides a connection which remains flexible and can be
separated in the future if service needs require the removal of
the vent pipe for service or clearance.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the venting
system being placed into operation could result in carbon
monoxide poisoning or death.
ALTITUDE
0-7,000 Feet
UY/DY060R9V3
UY/DY080R9V3
UY/DY100R9V4
UY/DY120R9V5
7,000-9,500 Feet
UY/DY060R9V3
UY/DY080R9V3
UY/DY100R9V4
UY/DY120R9V5
9,500-12,000 Feet
UY/DY060R9V3
UY/DY080R9V3
UY/DY100R9V4
UY/DY120R9V5
NOTES: * - First letter may be "A" or "T"
1. Minimum vent length for all models: 3' horizontal or 3' vertical.
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET, (Except adapters
at the top of the furnace). If different inlet and vent pipe sizes are used, the vent pipe must adhere to the maximum length limit
shown in the table above (See note 6 below for exception). The inlet pipe can be of a larger diameter, but never smaller than
the vent pipe.
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A COMBINED TOTAL, IT IS THE
MAXIMUM LENGTH OF EACH (Vent or Inlet air pipes).
4. One SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG radius elbow is equivalent to 6' of 3" pipe. One
90° elbow is equivalent to 7½' of 2½" pipe or 5' of 2" pipe. Two 45° elbows equal one 90°elbow.
5. The termination tee or bend must be included in the total number of elbows. If the BAYVENT100A termination kit is used,
the equivalent length of pipe is 5 feet. BAYVENT200A equivalent length is 0 feet.
6. Pipe adapters are field supplied. Downflow models, UY100, and UY120 include 2" X 3" pipe adapter.

HIGH ALTITUDE DERATE

Input ratings (BTUH) of these furnaces are based on sea
level operation and should not be changed at elevations up to
2,000 ft.
If the installation is 2,000 ft. or above, the furnace input rate
(BTUH) shall be reduced 4% for each 1,000 ft. above sea
level.
16
f
VENT LENGTH TABLE
MAXIMUM TOTAL EQUIVALENT LENGTH IN FEET
FOR VENT AND INLET AIR (SEE NOTES)
2 INCH PIPE
200
50
Not Allowed
Not Allowed
2 INCH PIPE
100
25
Not Allowed
Not Allowed
2 INCH PIPE
50
Not Allowed
Not Allowed
Not Allowed
The furnace input rate shall be checked by clocking the gas
flow rate (CFH) and multiplying by the heating value
obtained from the local utility supplier for the gas being
delivered at the installed altitude. Input rate changes can be
made by adjusting the manifold pressure (min 3.0 - max
3.7 in. W.C. - Natural Gas) or changing orifices (orifice change
may not always be required).
VENT AND INLET AIR CONNECTIONS
Front of Furnace
Seal INLET AIR PIPE
with RTV sealant
2.5 INCH PIPE
200
120
60
Not Allowed
2.5 INCH PIPE
100
60
30
Not Allowed
2.5 INCH PIPE
50
30
Not Allowed
Not Allowed
Seal VENT PIPE
with RTV sealant
3 INCH PIPE
200
200
200
200
3 INCH PIPE
100
100
100
100
3 INCH PIPE
50
50
50
50
18-CD20D3-18