High Altitude Derate - Trane *UH2B060A9V3VA Installer's Manual

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.
The Furnace input rate shall be checked by clocking the gas
flow rate (CFH) and multiplying by the heating value ob-
tained from the local utility supplier for the gas being deliv-
ered 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).
If the desired input rate can not be achieved with a change in
Manifold Pressure, then the orifices must be changed. LP
installations will require an orifice change.
IMPORTANT: Reinstall the replacement orifices to the same
depth as the orifices supplied with the equipment.
See Table 19 for help in selecting orifices if orifice change is
required. Furnace input rate and temperature rise should be
checked again after changing orifices to confirm the proper rate
for the altitude.
The vent length table on page 19 shows the required vent
lengths for installations at various altitudes. An optional
high altitude kit is available for installations above 5000
feet. Installations above 12,000 feet are not allowed.
Table 19
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL PART
SIZE NUMBER
44 ORF00501
45 ORF00644
46 ORF00909
47 ORF00910
48 ORF01099
49 ORF00503
50 ORF00493
Turn the main Gas Valve toggle switch (See Figures 30 & 31)
within the unit to the "OFF" position. Turn the external gas
valve to "ON". Purge the air from the gas lines. After purging,
check all gas connections for leaks with a soapy solution -- DO
NOT CHECK WITH AN OPEN FLAME. Allow 5 minutes
for any gas that might have escaped to dissipate.
LP Gas being heavier than air may require forced ventilation.
Turn the toggle switch on the Gas Valve in the unit to the "ON"
position.
If your application requires a high altitude pressure switch
use Table 20 to select the appropriate kit for your model
furnace.
Table 20
High Altitude Kits
BAYSWT08AHALTA
BAYSWT10AHALTA
18-CD26D1-10
DRILL PART
SIZE NUMBER
54 ORF00555
55 ORF00693
56 ORF00907
57 ORF00908
58 ORF01338
59 ORF01339
Used With
*UH2B/*DH2B080A9V3VA
*UH2B/*DH2B080A9V4VA
*UH2C/*DH2C100A9V4VA
*UH2C100A9V5VA
*UH2D/*DH2D120A9V5VA
*UH2B/*DH2B060A9V3VA
Installer's Guide
Orifice
ALTITUDE ABOVE SEA LEVEL
Twist Drill
Size If
and Orifice Required At Other Elevations
Installed
At Sea
Level
2000 3000 4000 5000 6000 7000 8000 9000 10000
42 42 43 43
43 44 44 44
44 45 45 45
45 46 47 47
46 47 47 47
47 48 48 49
54 54 55 55
55 55 55 55
56 56 56 57
57 58 59 59
58 59 60 60
From National Fuel Gas Code - Table F-4
Installation of this furnace at altitudes above 2000 ft
(610m) shall be in accordance with local codes, or in the
absence of local codes, the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or National Standard of Canada, Natural
Gas and Propane Installation Code, CSA B149.1.
Installation of this furnace at altitudes above 2000 ft (610
m) shall be made in accordance with the listed high
Altitude Conversion Kit available with this furnace.
Table 21
43 44 44 45 46
45 45 46 47 47
46 47 47 48 48
47 48 48 49 49
48 48 49 49 50
49 49 50 50 51
55 55 55 56 56
56 56 56 56 56
57 57 58 59 59
60 60 61 62 63
61 62 62 63 63
47
48
50
50
51
52
56
57
60
63
64
35