Combustion And Input Check; High Altitude Derate - Trane UHMB060ACV3VA Installer's Manual

Installer's Guide

COMBUSTION AND INPUT CHECK

(SEE ALSO HIGH ALTITUDE DERATE)
NOTE: Before checking or adjusting the gas pres-
sure, make sure the condensate trap has been
primed.
1. Make sure all Gas appliances are off except the fur-
nace.
2. Clock the Gas Meter with the furnace operating on
high heat for one revolution. Table 18 shows the
flow rate in cubic feet per hour for a measured
time of one revolution for a meter on which one
revolution indicates 2 cubic feet per hour of gas
flow. For other meters, use the following conver-
sions:
a) For 1 Cu. Ft. Dial Gas Flow CFH =
Chart Flow Reading ÷ 2
b) For 1/2 Cu Ft. Dial Gas Flow CFH =
Chart Flow Reading ÷ 4
c) For 5 Cu. Ft. Dial Gas Flow CFH =
10X Chart Flow Reading ÷ 4
3. Multiply the final figure by the heating value of the
gas obtained from the utility company and compare
to the nameplate rating. This must not exceed the
nameplate rating.
4. Repeat steps 2 and 3 with the furnace operating on
low heat.
5. Changes can be made by adjusting the manifold
pressure (See Table 15), or changing orifices
(orifice change may not always be required).
TABLE 15
FINAL NG MANIFOLD PRESSURE SETTINGS (inches w.c.)
Furnace Input rate
(KBTU/hr)
40%
60 0.7 + 0.2 / - 0.0
80 0.7 + 0.2 / - 0.0
100 0.7 + 0.2 / - 0.0
Downflow 120 0.7 + 0.2 / - 0.0
Upflow 120 0.9 + 0.2 / - 0.0
For upflow 120KBTU/hr model, 1st stage is 45%
Manifold pressures apply for Natural Gas applications ONLY
FINAL LP MANIFOLD PRESSURE SETTINGS (inches w.c.)
Furnace Input rate
(KBTU/hr)
40%
60 2.1 ± 0.5
80 2.1 ± 0.5
100 2.1 ± 0.5
Downflow 120 2.1 ± 0.5
Upflow 120 2.9 ± 0.5
For upflow 120KBTU/hr model, 1st stage is 45%
Manifold pressures apply for Propane applications ONLY
36
65% 100%
Not Adjustable 3.5 ± 0.2
Not Adjustable 3.5 ± 0.2
Not Adjustable 3.5 ± 0.2
Not Adjustable 3.5 ± 0.2
Not Adjustable 3.5 ± 0.2
65% 100%
Not Adjustable 10.0 ± 0.5
Not Adjustable 10.0 ± 0.5
Not Adjustable 10.0 ± 0.5
Not Adjustable 10.0 ± 0.5
Not Adjustable 10.0 ± 0.5

HIGH ALTITUDE DERATE

▲
CAUTION
!
CAUTION
Maintain manifold pressure as specified in Table 15
in high altitude installations. Failure to do so may
result in poor ignition characteristics.
Input ratings (BTUH) of these furnaces are based on sea
level operation and should not be changed at elevations
up to 2,000 ft. (610m).
If the installation is 2,000 ft. (610m) or above, the fur-
nace input rate (BTUH) shall be reduced 4% for each
1,000 ft. above sea level.
Installation of this furnace at altitudes above 2,000 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.
The furnace input rate shall be checked by using the
methods of Combustion and Input Check. High altitude
kits are listed in Table 15A.
Table 15A
High Altitude Kit
BAYSWT07AHALTA
BAYSWT09AHALTA
BAYSWT08AHALTA
* May be "A" or "T"
Used with Model:
*UHMB060ACV3V
*DHMB060ACV3V
*DHMB060BCV3V
*UHMB080ACV3V
*DHMB080ACV3V
*UHMC100ACV4V
*DHMC100ACV4V
*UHMD120ACV5V
*DHMD120ACV5V
*DHMD120BCV5V
18-CD30D1-9