Bryant 800SB Operating Instructions Manual page 35

800SB/801SB: Installation, Start–Up, Operating and Service and Maintenance Instructions
Table 17 – Orifice Size* And Manifold Pressure (in. w.c.) for Gas
Input Rate
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Adjust Temperature Rise
5. Set temperature rise. 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:
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.
NOTE: Blower access door must be installed when taking temperature
rise reading. Leaving blower access door off will result in incorrect
temperature measurements.
a. Place thermometers in return and supply ducts as close to furnace
as possible. Be sure thermometers do not see radiant heat from
heat exchangers. Radiant heat affects temperature rise readings.
This practice is particularly important with straight-run ducts.
b. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine air
temperature rise.
NOTE: If the temperature rise is outside this range, first check:
(1.) Gas input for heating operation.
(2.) Derate for altitude if applicable.
(3.) Return and supply ducts for excessive restrictions causing
static pressures greater than 0.50-in. w.c.
ELECTRICAL SHOCK HAZARD
A10181
Failure to follow this warning could result in personal injury or death.
Blower access door switch opens 115-V power to control. No
component operation can occur unless switch is closed. Caution must
be taken when manually closing this switch.
c. Adjust air temperature rise by adjusting blower speed. Increase
blower speed to reduce temperature rise. Decrease blower speed
to increase temperature rise
d. Turn thermostat down below room temperature and remove
blower access door.
e. Refer to the FURNACE CONTROL PROGRAMMING AND
NAVIGATION section of this manual for instructions on
adjusting the blower speed.
f. Repeat steps a through e until temperature rise is within range on
rating plate.
g. When correct input rate and temperature rise is achieved, turn
gas valve ON/OFF switch to OFF.
A10181A
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Reinstall manifold pressure tap plug in gas valve to prevent gas leak.
h. Remove manometer or similar device from gas valve.
i. Reinstall manifold pressure tap plug in gas valve.
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CAUTION
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WARNING
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WARNING
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