Rate - Bryant 926TC Installation, Start-Up, Operating And Service And Maintenance Instructions

926TC: Installation, Start-up, Operating and Service and Maintenance Instructions
pressure to decrease input. Repeat steps b through e of Step 1
until correct low-heat input is achieved. Re-install low heat
regulator seal cap on gas valve.
i. Jumper R to W/W1, and W2. This keeps furnace locked in
high-heat operation when both W/W1 and W2 are energized.
j. Repeat items d through g for high-heat operation, repeating Step
2 and adjusting the high-heat regulator screw as required.
k. Remove jumpers R to W/W1 and R to W2.
Table 26 – Orifice Size and Manifold Pressure (in. w.c.) for Gas
Input Rate
TWO-STAGE FURNACE
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE A V G . G A S
RANGE
HEAT VALUE 0.58
AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
ft (m) (Btu/cu ft) No. High/Low
900 43 3.8 / 1.6
0 925 43 3.6 / 1.5
(0) 950 43 3.4 / 1.4
975 44 3.7 / 1.6
to 1000 44 3.5 / 1.5
1025 44 3.3 / 1.4
2000 1050 44 3.2 / 1.3
(610) 1075 45 3.7 / 1.6
1100 46 3.7 / 1.6
U.S.A. 800 42 3.4 / 1.4
2001 (611) 825 43 3.8 / 1.6
to 850 43 3.6 / 1.5
3000 (914) 875 43 3.4 / 1.4
900 44 3.7 / 1.6
Canada 925 44 3.5 / 1.5
2001 (611) 950 44 3.3 / 1.4
to 975 44 3.2 / 1.3
4500 (1372) 1000 46 3.8 / 1.6
775 42 3.3 / 1.4
3001 800 43 3.8 / 1.6
(915) 825 43 3.6 / 1.5
850 44 3.8 / 1.6
to
875 44 3.6 / 1.5
4000 900 44 3.4 / 1.4
(1219) 925 44 3.2 / 1.4
950 45 3.7 / 1.6
750 42 3.3 / 1.4
4001 775 43 3.7 / 1.6
(1220) 800 43 3.5 / 1.5
825 44 3.8 / 1.6
to
850 44 3.5 / 1.5
5000 875 44 3.3 / 1.4
(1524) 900 44 3.2 / 1.3
925 46 3.8 / 1.6
725 42 3.2 / 1.4
5001 750 43 3.7 / 1.5
(1525) 775 43 3.4 / 1.4
800 44 3.7 / 1.6
to
825 44 3.5 / 1.5
6000 850 44 3.3 / 1.4
(1829) 875 45 3.7 / 1.6
900 46 3.7 / 1.6
675 42 3.4 / 1.4
6001 700 42 3.2 / 1.3
(1830) 725 43 3.6 / 1.5
750 43 3.4 / 1.4
to
775 44 3.6 / 1.5
7000 800 44 3.4 / 1.4
(2133) 825 44 3.2 / 1.3
850 46 3.8 / 1.6
Table 26 - Orifice Size and Manifold Pressure (in. w.c.) for Gas Input
Rate (Continued)
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
S P E C F I C I G R A V T I Y O F N A T U R A L G A S
0.60 0.62 0.64
No. High/Low No. High/Low No. High/Low
42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.4
43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4
43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
44 3.8 / 1.6 43 3.4 / 1.5 43 3.6 / 1.5
44 3.6 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4
44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
45 3.8 / 1.6 44 3.3 / 1.4 44 3.4 / 1.4
46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4
42 3.5 / 1.5 42 3.6 / 1.5 42 3.7 / 1.6
42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5
43 3.7 / 1.6 42 3.2 / 1.3 42 3.3 / 1.4
43 3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6
44 3.8 / 1.6 43 3.5 / 1.5 43 3.6 / 1.5
44 3.6 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4
44 3.4 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4
42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5
42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.4
43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4
43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
44 3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
44 3.5 / 1.5 44 3.7 / 1.5 44 3.8 / 1.6
44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5
44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4
42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5
43 3.8 / 1.6 42 3.3 / 1.4 42 3.4 / 1.4
43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6
43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5
44 3.7 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4
44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
45 3.7 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4
42 3.3 / 1.4 42 3.4 / 1.5 42 3.5 / 1.5
43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4
43 3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6
44 3.8 / 1.6 43 3.4 / 1.5 43 3.5 / 1.5
44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6
44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5
44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4
46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4
42 3.5 / 1.5 42 3.6 / 1.5 42 3.8 / 1.6
42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5
43 3.7 / 1.6 43 3.8 / 1.6 42 3.3 / 1.4
43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
44 3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4
A11252A
(TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER,
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE A V G . G A S
RANGE
HEAT VALUE
AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
ft (m) No.
(Btu/cu ft)
650 42
7001 675 43
(2134) 700 43
725 44
to
750 44
8000 775 44
(2438) 800 45
825 46
625 42
8001 650 43
(2439) 675 43
700 44
to
725 44
9000 750 44
(2743) 775 45
9001 600 42
(2744) 625 43
650 43
to
675 44
10000 700 44
(3048) 725 44
* Orifice numbers shown in BOLD are factory-installed.
4. Restore furnace to normal operating condition.
a. Turn gas valve ON/OFF switch to OFF.
b. Remove water column manometer or similar device from
manifold pressure tap.
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Manifold pressure tap set screw must be tightened or 1/8-in. NPT pipe
plug must be installed to prevent gas leaks.
c. Tighten set screw on manifold pressure tap with 3/32-in. hex
wrench, or if 1/8-in. NPT plug was removed, apply pipe dope
sparingly to end of plug and re-install in the gas valve.
d. Turn gas valve ON/OFF switch to ON.
e. On the 3 digit display, navigate to (Htt) and select the setting
required for attached thermostat (1St) for single-stage
thermostats, (2St) for two-stage thermostats).
f. Check for gas leaks and verify furnace operation.
Adjust Temperature Rise
NOTE: Blower door must be installed when taking temperature rise
reading. Leaving blower door off will result in incorrect temperature
measurements, due to possible changes in duct static pressure and
airflow.
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in:
- Overheating the heat exchangers or condensing flue gases in
heat exchanger areas not designed for condensate.
- Shortened furnace life
- Component damage.
Temperature rise must be within limits specified on furnace rating plate.
Recommended operation is at midpoint of rise range or slightly above.
The furnace must operate within the temperature rise ranges specified on
the furnace rating plate. Do not exceed temperature rise range specified
on unit rating plate. Determine the temperature rise as follows:
1. Place thermometers in return and supply ducts as near furnace as
possible. Be sure thermometers do not see heat exchanger so that
62
TWO-STAGE FURNACE
S P E C F I C I G R A V T I Y O F N A T U R A L G A S
0.58 0.60 0.62
High/Low No. High/Low No. High/Low
3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5
3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4
3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6
3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
3.5 / 1.5 44 3.7 / 1.5 44 3.8 / 1.6
3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4
3.7 / 1.6 46 3.8 / 1.6 45 3.8 / 1.6
3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5
3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4
3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5
3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6
3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5
3.7 / 1.6 44 3.2 / 1.3 44 3.3 / 1.4
3.3 / 1.4 42 3.4 / 1.5 42 3.6 / 1.5
3.7 / 1.6 42 3.2 / 1.3 42 3.3 / 1.4
3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6
3.7 / 1.6 44 3.8 / 1.6 43 3.4 / 1.4
3.4 / 1.4 44 3.5 / 1.5 44 3.7 / 1.5
3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4
WARNING
CAUTION
0.64
No. High/Low
42 3.7 / 1.6
42 3.4 / 1.5
42 3.2 / 1.4
43 3.6 / 1.5
43 3.4 / 1.4
44 3.7 / 1.5
44 3.4 / 1.4
44 3.2 / 1.4
42 3.7 / 1.6
42 3.4 / 1.4
42 3.2 / 1.3
43 3.6 / 1.5
44 3.8 / 1.6
44 3.6 / 1.5
44 3.4 / 1.4
42 3.7 / 1.6
42 3.4 / 1.4
43 3.8 / 1.6
43 3.5 / 1.5
44 3.8 / 1.6
44 3.5 / 1.5
A11252B