Bryant 926TC Installation, Start-Up, Operating And Service And Maintenance Instructions page 69

926TC: Installation, Start-up, Operating and Service and Maintenance Instructions
Flushing Collector Box and Drainage System
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Turn off the gas and electrical supplies to the furnace and install lockout
tag before performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace.
1. Turn off gas and electrical supplies to furnace.
2. Remove control door.
3. Disconnect pressure switch tube from pressure switch port.
NOTE: Ensure the pressure switch tube disconnected from the pressure
switch is higher than the collector box opening or water will flow out of
tube.
4. Remove the collector box plug from the top port on the upper
corner of the collector box. See
5. Attach a funnel with a flexible tube to port on the collector box.
6. Flush inside of collector box with water until discharge water from
condensate trap is clean and runs freely.
7. Repeat steps 4 through 6 with bottom plug on upper corner of
collector box.
8. Remove the pressure switch tube from the collector box.
NOTE: Do NOT blow into tube with tube connected to the pressure
switch.
9. Clean pressure switch port on collect box with a small wire. Shake
any water out of pressure switch tube.
10. Reconnect tube to pressure switch and pressure switch port.
11. Remove the relief tube from the port on the collector box and the
trap.
12. Clean the relief port on collect box and the trap with a small wire.
Shake any water out of the tube.
13. Reconnect relief tube to trap and collector box ports.
Cleaning Condensate Drain and Trap
NOTE: If the condensate trap is removed, a new gasket between the
trap and collector box is required. Verify a condensate trap gasket is
included in the service kit or obtain one from your local distributor.
1. Disconnect power at external disconnect, fuse or circuit breaker.
2. Turn off gas at external shut-off or gas meter.
3. Remove control door and set aside.
4. Turn electric switch on gas valve to OFF.
5. Disconnect external drain from condensate drain elbow or drain
extension pipe inside the furnace and set aside.
6. Disconnect the condensate trap relief hose from collector box port
and condensate trap.
NOTE: If condensate has a heat pad attached to the trap, trace the wires
for the pad back to the connection point and disconnect the wires for the
heat pad.
7. Remove the screw that secures the condensate trap to the collector
box, remove the trap and set aside.
8. Remove the trap gasket from the collector box if it did not come off
when the trap was removed.
9. Discard the old trap gasket.
10. Rinse condensate trap in warm water until trap is clean.
11. Flush condensate drain lines with warm water. Remember to check
and clean the relief port on the collector box.
12. Shake trap dry.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 62.
13. Clean port on collector box with a small wire.
To re-install Condensate Drain and Trap:
1. Remove adhesive backing from condensate trap gasket
2. Install gasket on collector box
3. Align the condensate trap with the drain opening on the collector
box and secure the trap with the screw
4. Attach the relief hose to the relief port on the condensate trap and
collector box.
5. Secure tubing to prevent any sags or traps in the tubing.
6. Connect condensate drain elbow or drain extension elbow to the
condensate trap
7. Connect the leads of the condensate heat pad (if used)
8. Connect external drain piping to the condensate drain elbow or
drain extension pipe.
9. Turn gas on at electric switch on gas valve and at external shut-off
or meter
10. Turn power on at external disconnect, fuse or circuit breaker.
11. Run the furnace through two complete heating cycles to check for
proper operation
12. Install control door when complete.
Checking Heat Pad Operation (If Applicable)
In applications where the ambient temperature around the furnace is
32_F or lower, freeze protection measures are required. If this
application is where heat tape has been applied, check to ensure it will
operate when low temperatures are present.
NOTE: The Heat Pad, when used, should be wrapped around the
condensate drain trap. There is no need to use heat tape within the
furnace casing. Most heat tapes are temperature activated, and it is not
practical to verify the actual heating of the tape. Check the following:
1. Check for signs of physical damage to heat tape such as nicks, cuts,
abrasions, gnawing by animals, etc.
2. Check for discolored heat tape insulation. If any damage or
discolored insulation is evident, replace heat tape.
3. Check that heat tape power supply circuit is on.
Cleaning Heat Exchangers
The following items must be performed by a qualified service
technician.
Primary Heat Exchangers
If the heat exchangers get an accumulation of light dirt or dust on the
inside, they may be cleaned by the following procedure:
NOTE: If the heat exchangers get a heavy accumulation of soot and
carbon, both the primary and secondary heat exchangers should be
replaced rather than trying to clean them thoroughly due to their intricate
design. A build-up of soot and carbon indicates that a problem exists
which needs to be corrected, such as improper adjustment of manifold
pressure, insufficient or poor quality combustion air, improper vent
termination, incorrect size or damaged manifold orifice(s), improper gas,
or a restricted heat exchanger (primary or secondary). Action must be
taken to correct the problem.
1. Turn off gas and electrical supplies to furnace.
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