Reznor MAPSII Series REDA Users Manual - Manual (Page 28)

Form O-MAPS II, P/N 209179 R7, Page 28
Record installation information on the back
of the installation manual, Form I-MAPS II.
Keep ALL booklets for future reference.
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©2008 Thomas & Betts, All rights reserved.
Trademark Note: Reznor ® and MAPS ® are registered in the United States.
9/08 Form O-MAPS II (Version B.3)
Troubleshooting the Electric Heat Section - Models REDA and RECA
11.0 Troubleshooting (cont'd)
PROBLEM PROBABLE CAUSE REMEDY
Unit does not
operate
1. No power to unit 1. Turn on power; check supply fuses or main circuit breaker.
2. Blown fuses 2. Check and replace if necessary.
3. Defective or incorrect wiring. 3. Check wiring and connections. Refer to wiring diagram provided with unit.
4. Defective or burned out control
transformer
4. Check secondary voltage with voltmeter. Replace if necessary.
Fan operates but
element does
not heat
1. Dirty filters 1. Check filters and clean or replace if necessary.
2. Defective air proving switch 2. Check and replace if necessary.
3. Blown element fuses 3. Check and replace element fuses if necessary.
Insufficient heat 1. Burned out element 1. Turn off power and check element resistance with ohmmeter. Replace if open.
2. Blown fuses 2. Check and replace if necessary.
3. Cycling on limit control 3.
a) Check air throughput (temperature rise).
b) Check motor rpm against nameplate rating. Replace motor if speed is too slow.
c) Defective limit control. Check wiring and connections. Check continuity through control and
replace if necessary.
4. Defective or incorrect wiring. 4. Check wiring and connections. Refer to wiring diagram provided with unit.
Index
B
Belt 7
Brazing 15
Burner Maintenance 21
Burner Orifices 22
Burner Removal Instructions 21
C
Charge the System 17
Check System for Leaks 15
Coil Maintenance 8
Combustion Air Pressure Switch 24
Compressor Locations 12, 17
Compressor Maintenance 11
Condenser Coil Connections 8
Condenser Coils 8
Crankcase Heater 17
Cross-Reference by Model/Size and
Cabinet Size 6
Curb duct furnace 21
D
DSI Integrated Control Module 22
Duct furnace 21
E
Electric Heat Section Maintenance 25
Evacuate the System 16
Evaporative Coils 8
F
Filter Driers 14
Filters 6
Filters in the Outside Air Hood 6
Flame Sensors 23
G
Gas Heat Section Maintenance 20
Gas Valves 24
GENERAL 2
H
Handling 12
Hazard Intensity Levels 3
Heat Exchanger 21
I
Ignition System 22
Ignitor 23
Inlet Air Filters 6
L
Lights on the DSI Integrated Control
Module 26
Limit Control 24
Locations of Standard and Optional
Controls 5
M
Maintenance Requirements 3
Maintenance Schedule 3
Model JHUP 2, 21
Mounting Grommets 14
O
Oil Charge 14
Operating Head Pressure 11
Outside Air Hood 7
R
Re-Heat Pump 10
Refrigerant Pressure 9
Refrigerant Temperatures 10
S
Signal Conditioner 24
Spark Gap 23
Subcooling 18
Superheat 18
System Startup 18
T
Thermal Expansion Valves 20
Troubleshooting 25
Troubleshooting - Gas Heat Section
27
Troubleshooting Gas Heat Section 26
Troubleshooting the Electric Heat Sec-
tion 28
V
Valve 24
Venter Motor and Wheel 23
Venter Wheel Position 23