Nortek Reznor UDSA-4E 011, Установка, пусконаладка, обслуживание

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I-UDSA-UK (02-19) PN 06 00116 UDSA R3, page 28
General troubleshooting
Problem Probable Cause Remedy
Venter
motor will
not start
1. No power to unit Turn on power, check supply fuses or circuit breaker
2. No power to venter motor Check connections at burner relay and/or venter motor terminals
3. Integrated burner relay defective Replace burner relay
4. Defective venter motor Replace venter motor (refer to section 26)
5. Fuse blown (F3.1) Replace fuse
6. Fuse burner relay blown Replace fuse
7. LC1 open Set heater on ventilation until LC1 closes
Replace LC1
Check for obstruction at fan side
8. LC3 open Reset LC3
Replace LC3
9. Unit in lock-out Push on reset button
10. Room thermostat open Set thermostat above room temperature
Burner
will
not light
1. Main valve not operating Check voltage on valve during ignition period
Check connector on main gas valve
Check connector on burner relay
Replace valve
2. Air in the gas line Purge gas line
3. Gas pressure too high or too low Supply pressure should be 15 mbar for natural gas (UK only) or 37 mbar for propane gas
(UK only)
Obstruction in the gas line
Gas line connection diameter too small
4. No spark Check following:
Ensure that all wire connections are solid
Maintain spark gap at 3 mm
Replace worn or grounded spark cable
Replace ceramic spark electrode if cracked or grounded
Check burner relay ground wire
Ensure that unit is properly field grounded (earthed) and properly phased (L1 to hot lead,
L2 to neutral)
If voltage is available to burner relay and all other causes have been eliminated, replace
burner relay
5. Combustion airs pressure switch
not closing upon power to venter and
reset lamp is burning
Check following in order:
Ensure that unit is properly vented
Remove obstructions from vent
Replace faulty tubing to pressure switch
Replace faulty pressure switch
Burner
cycles
on and off
1. Gas pressure too high or too low Supply pressure should be 15 mbar for natural gas (UK only) or 37 mbar for propane gas
(UK only)
2. Burner relay not grounded Check burner relay ground wire connection
3. Faulty burner relay If (220/240) volts is available to burner relay and all other causes have been eliminated,
replace burner relay
4. Flame sensor grounded Ensure that flame sensor lead is not grounded or insulation or ceramic is not cracked;
replace as required
5. Cracked ceramic at sensor Replace sensor
6. Incorrect polarity Check polarity switch and if necessary reverse line voltage wires to terminal block
connections
Blower
or venter
motor
turns on
and off
while
burner is
operating
1. Motor internal thermal protection
device cycling on and off
Check motor load against motor rating plate; replace motor if needed