Carrier N92MSN Installation, Start-Up, Operating And Service And Maintenance Instructions page 57

N92MSN: Installation, Start-up, Operating and Service and Maintenance Instructions
Table 26 – Orifice Size and Manifold Pressure (in. w.c.) for Gas
Input Rate
SINGLE-STAGE FURNACE
(TABULATED DATA BASED ON 20,000 BTUH 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 Manifold
ft (m) (Btu/cu ft) No. Pressure
900 43
0 925 43
(0) 950 43
975 44
to 1000 44
1025 44
2000 1050 44
(610) 1075 45
1100 46
U.S.A. 800 42
2001 (611) 825 43
to 850 43
3000 (914) 875 43
900 44
Canada 925 44
2001 (611) 950 44
to 975 44
4500 (1372) 1000 44
775 42
3001 800 43
(915) 825 43
850 44
to
875 44
4000 900 44
(1219) 925 44
950 44
750 42
4001 775 43
(1220) 800 43
825 44
to
850 44
5000 875 44
(1524) 900 44
925 44
725 42
5001 750 43
(1525) 775 43
800 44
to
825 44
6000 850 44
(1829) 875 44
900 44
675 42
6001 700 42
(1830) 725 43
750 43
to
775 44
7000 800 44
(2133) 825 44
850 44
SINGLE-STAGE FURNACE
(TABULATED DATA BASED ON 20,000 BTUH 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 Manifold
ft (m) (Btu/cu ft) No. Pressure
650 42
7001 675 43
(2134) 700 43
725 44
to
750 44
8000 775 44
(2438) 800 44
825 44
625 42
8001 650 43
(2439) 675 43
700 44
to
725 44
9000 750 44
(2743) 775 44
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
S E P C F I C I G R A I V Y T O F N A T U R A L G A S
0.60 0.62
Orifice Manifold Orifice Manifold Orifice
No. Pressure No. Pressure No.
3.8 42 3.2 42 3.3 42
3.6 43 3.7 43 3.8 42
3.4 43 3.5 43 3.6 43
3.7 44 3.8 43 3.4 43
3.5 44 3.6 44 3.8 43
3.3 44 3.5 44 3.6 44
3.2 44 3.3 44 3.4 44
3.7 45 3.8 44 3.3 44
3.7 46 3.8 45 3.8 44
3.4 42 3.5 42 3.6 42
3.8 42 3.3 42 3.4 42
3.6 43 3.7 42 3.2 42
3.4 43 3.5 43 3.7 43
3.7 44 3.8 43 3.5 43
3.5 44 3.6 44 3.8 43
3.3 44 3.4 44 3.6 44
3.2 44 3.3 44 3.4 44
3.0 44 3.1 44 3.2 44
3.3 42 3.4 42 3.5 42
3.8 42 3.2 42 3.3 42
3.6 43 3.7 43 3.8 42
3.8 43 3.5 43 3.6 43
3.6 44 3.7 43 3.4 43
3.4 44 3.5 44 3.7 44
3.2 44 3.4 44 3.5 44
3.1 44 3.2 44 3.3 44
3.3 42 3.4 42 3.5 42
3.7 43 3.8 42 3.3 42
3.5 43 3.6 43 3.7 43
3.8 43 3.4 43 3.5 43
3.5 44 3.7 44 3.8 43
3.3 44 3.5 44 3.6 44
3.2 44 3.3 44 3.4 44
3.0 44 3.1 44 3.2 44
3.2 42 3.3 42 3.4 42
3.7 43 3.8 42 3.2 42
3.4 43 3.5 43 3.7 43
3.7 44 3.8 43 3.4 43
3.5 44 3.6 44 3.7 44
3.3 44 3.4 44 3.5 44
3.1 44 3.2 44 3.3 44
2.9 44 3.0 44 3.1 44
3.4 42 3.5 42 3.6 42
3.2 42 3.3 42 3.4 42
3.6 43 3.7 43 3.8 42
3.4 43 3.5 43 3.6 43
3.6 44 3.7 43 3.4 43
3.4 44 3.5 44 3.6 44
3.2 44 3.3 44 3.4 44
3.0 44 3.1 44 3.2 44
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
Orifice Manifold Orifice Manifold Orifice
No. Pressure No. Pressure No.
3.4 42 3.5 42 3.6 42
3.8 42 3.2 42 3.3 42
3.5 43 3.7 43 3.8 42
3.8 43 3.4 43 3.5 43
3.5 44 3.7 44 3.8 43
3.3 44 3.4 44 3.5 44
3.1 44 3.2 44 3.3 44
2.9 44 3.0 44 3.1 44
3.4 42 3.5 42 3.6 42
3.8 42 3.2 42 3.3 42
3.5 43 3.6 43 3.7 42
3.7 43 3.4 43 3.5 43
3.5 44 3.6 44 3.7 44
3.3 44 3.4 44 3.5 44
3.0 44 3.2 44 3.3 44
3.3 42 3.4 42 3.6 42
3.7 42 3.2 42 3.3 42
3.5 43 3.6 43 3.7 43
3.7 44 3.8 43 3.4 43
3.4 44 3.5 44 3.7 44
3.2 44 3.3 44 3.4 44
3. 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.
c. Tighten set screw on manifold tower pressure tap with 3/32-in.
0.64
hex wrench, or if ⅛-in. NPT plug was removed, apply pipe dope
Manifold
sparingly to end of plug and re-install in the gas valve.
Pressure
d. Turn gas valve ON/OFF switch to ON.
3.4
3.2
e. Check for gas leaks and verify furnace operation.
3.7
3.6
3.4
3.7
3.5
FIRE HAZARD
3.4
3.2
Failure to follow this warning could result in personal injury, death,
3.7
and/or property damage.
3.5
3.3 Manifold pressure tap set screw must be tightened and 1/8-in. NPT pipe
3.8
plug must be installed to prevent gas leaks.
3.6
3.4
Adjust Temperature Rise
3.7
3.5
4. Set temperature rise. The furnace must operate within the
3.3
3.6
temperature rise ranges specified on the furnace rating plate. Do not
3.4
exceed temperature rise range specified on unit rating plate.
3.2
Determine the temperature rise as follows:
3.7
3.5
NOTE: Blower door must be installed when taking temperature rise
3.8
reading. Leaving blower door off will result in incorrect temperature
3.6
3.4
measurements, due to possible changes in duct static pressure and
3.6
airflow.
3.4
3.8
This furnace must operate within the temperature rise ranges specified
3.6
on the furnace rating plate. Determine the air temperature as follows:
3.4
a. Place duct thermometers in return and supply ducts as close to
3.7
3.5
furnace as possible. Be sure thermometers do not "see" heat
3.3
exchangers so that radiant heat does not affect thermometer
3.5
readings. This is particularly important with straight run ducts.
3.3
3.8
b. When thermometer readings stabilize, subtract return-air
3.5
temperature from supply-air temperature to determine
3.8
temperature rise.
3.6
3.4
If the temperature rise is outside this range, check the following:
3.2
(1.) Gas input for heating operation.
3.8
3.5
(2.) Derate for altitude if applicable.
3.3
(3.) Return and supply ducts for excessive restrictions causing
3.7
static pressures greater than 0.50-in. w.c.
3.5
3.7
3.5
3.3
A11253A
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
0.64
Blower access door switch opens 115-V power to control. No
Manifold
component operation can occur unless switch is closed. Caution must
Pressure
3.7
be taken when manually closing this switch.
3.4
3.2
3.6 c. Adjust air temperature rise by adjusting blower speed. Increase
3.4
blower speed to reduce temperature rise. Decrease blower speed
3.7
3.4 to increase temperature rise
3.2
d. Turn thermostat down below room temperature and remove
3.7
blower access door.
3.4
3.2
e. Refer to the FURNACE CONTROL PROGRAMMING AND
3.6
NAVIGATION section of this manual for instructions on
3.8
3.6
adjusting the blower speed.
3.4
f. Repeat steps a through e until temperature rise is within range on
3.7
3.4
rating plate.
3.8
g. When correct input rate and temperature rise is achieved, turn
3.5
3.8
gas valve ON/OFF switch to OFF.
3.5
A11253B
57
WARNING
!
WARNING
!