HHP PBNU-LD20N140 Installation Instructions Manual - Page 16

Browse online or download pdf Installation Instructions Manual for Furnace HHP PBNU-LD20N140. HHP PBNU-LD20N140 20 pages. Gas-fired furnaces high-efficiency upflow condensing models

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2. Remo ve the acce ss pane ls.

3. D iscon ne ct the two wire harness plugs from the top of the

control box.

4. Remove the four screws holding the control box and

position it out of the way.

5. Remove the hoses from the top of the condensate drain

trap, and one at the front of the trap.

6. Remove screws which retain blower to the blower deck.

7. Remove the blower assembly with the condensate drain

trap and the control wiring still attached.

8. Vacuum the motor and the blower wheel using a soft brush

attachment. Care must be used not to disturb the balance

weights (clips) on the blower wheel vanes.

9. Before reinstalling the blower assembly, inspect the lower

portion of the secondary heat exchanger which is visible

directly above the blower opening in the blower deck. If it

requires cleaning, vacuum it with a soft brush attachment

and follow the direction of the fins.

10. Reinstall the blower assembly and the condensate drain

hoses. Replace the mounting screws that hold the blower

assembly

the front portion of the blower deck. The two

mounting screws :used on the sides of the blower are used

for shipping purposes only, and are not necessary after the

furnace has bee n installed.

11. Reinstall the control box and reconnect the wiring harness

plugs.

12. Replace the access doors and restore the electrical supply

to the unit.

WARNING: If

the condensate drain trap has been emptied

during this cleaning procedure, refill it by following the

stru

tions found

in the •start-Up and Adjustment" section

this instruction.

13. O p e rat e the unit for a minimum of five minutes and care

fully check for any leaks in the condensate drain connec

tions.

TROUBLESHOOTING

CAUTION:

ing controls. Wiring errors can cause improper and dan

gerous operation. Verify proper operfjltion after servicing.

The following visual checks should

bleshooting:

1. Check to see that the power to the furnace and the 50E4 7

control module is ON.

2. The manual shutoff valves in the gas line to the furnace

must

3. Make sure all wiring connections are secure.

Review the sequence of operation.

Start the system by setting th. e _ thermostat above the room

temperature. Observe the system's response. Then use the

Troubleshooting Table to check the system's operation.

Start the system by reading the upper left-hand box and the n

following the instructions in each box. If the condition described

in the box is true (yes answer), go down to the next box. If the

condition is not true (no answer), go to the box to the right.

Continue checking and answering the questions in the boxes

until the problem is explained and corrective action is de·

scribed. After any maintenance or repair, the troubleshootin g

sequence should

obtained.

WARNING:

controls with UPG Source 1 Parts.

Label all wires prior to disconn ection 'Nhen servic

open.

repeated until normal system operation is

try

Do not

to repair controls. Replace defective

650.65-N2

made before trou