Reznor B Unit Installation Manual - Manual (Page 39)

Form I-F/B, P/N 98126 R21, Page 39
TROUBLE PROBABLE CAUSE REMEDY
No heat (Heater
Operating)
1. Incorrect manifold pressure or orifices. 1. Check manifold pressure (See Paragraph 6.1).
2. Cycling on limit control. 2. Check air throughput (See Paragraph 16).
3. Improper thermostat location or adjustment. 3. See thermostat manufacturer's instructions.
Cold air delivered 1. Fan control improperly wired 1. Connect as per wiring diagram.
On Start-up 2. Defective fan control. 2. Replace fan control.
During Operation 3. Incorrect manifold pressure. 3. Check manifold line pressure (See Paragraph 6.1).
Motor will not run 1. Circuit open. 1. Check wiring and connections. .
2. Fan control inoperative. 2. Replace fan control.
3. Defective motor or capacitor. 3. Replace motor or capacitor.
Motor turns on
and off while
burner is operating
(See motor cuts
out on overload
below)
1. Fan control improperly wired. 1. Connect as per wiring diagram.
2. Defective fan control. 2. Replace fan control.
3. Poor contact between fan control and heat
exchanger tube. Surface contact is required.
3. Check for bent mounting or loose mounting screws.
4. Motor overload device cycling on and off 4. Check motor load against motor rating plate. Replace motor if needed.
5. Low ambient temperature (less than 40°F)
causing false cycling
5. Install fan delay kit (See Paragraph 8.1).
Fan motor cuts
out on overload
1. Low or high voltage supply . 1. Correct electric supply.
2. Defective motor. 2. Replace motor.
3. Poor air flow. 3. Clean motor, fan and fan guard.
4. Defective bearing or lubrication. 4. Lubricate bearings or replace motor.
Blower motor
cuts out on
overload
1. Improper motor pulley and/or adjustment. 1. See instructions in Paragraph 6.5.
2. Improper static pressure in the duct system. 2. Adjust duct system dampers.
3. Low voltage. 3. Check power supply.
INDEX
A
Air Shutter Adjustment 31
B
Belt Tension 22
Blocked Vent Switch 30, 37
Blower 36
Blower/Filter Cabinet 19
Blower Operation 22
Blower Rotation 23
Blower Speed Adjustment 22
Burner Air Adjustment 31
Burner Orifices 35, 36
Burner Rack Removal 34
Burner Rack Support 34
C
Carryover 36
Clearances 8
Combustion Air Requirements 4
Confined Space 4
Electrical Supply Connections 24
Contact 40
Control Wiring 24
D
Vent Control Damper 19
Derating by Valve Outlet 15
Dimensions 9
Direct Drive 22
Unit Discharge 20
Downturn Air Nozzles 20
Duct Flange 20
E
ECO Control 37, 38
Electrical Supply and Wiring 23
F
Fan 22, 36
Fan Blade 37
Fan Control 30, 38
OPTIONAL 50 HERTZ OPERATION 24
Flash Carryover 36
Field assembly of the flue outlet 5
G
Gas Supply and Connections 13
Guard Options - Model B 7
H
Hanger Kits 12
Hanging the Heater 11
Hazard Labels 2
Heat Exchanger 36
High Altitude Installation 5
I
Ignition System 31, 35, 36
Inlet Air - Blower Model B 19
Installation Codes 3
L
Lifting 11
Limit 37, 38
Heater Location 3
Optional Vertical Louvers 20
M
MAINTENANCE 33
Maintenance Schedule 33
Multiple Heater Control 25
N
Downturn Nozzles 20
O
Orifice Pressure Settings 15
P
Pilot 31, 35, 36
Piping Connection 14
Polytube Adapter 21
Power Venting 19
Preparing the Heater for Installation 4
Outlet (Manifold) Pressure by Elevation
15
S
SAFETY 1
Spark Gap 36
Start-Up 32
Suspending 11
T
Troubleshooting 38
U
Uncrating and Inspecting 4
V
Check Valve Outlet (Manifold) Pressure
15
Gas Valve 30, 33
Vent Control Damper 19
Venting 16
Venting Arrangement 18
Venting Requirements 16
Vent Outlet 5
Vent Outlet Instructions for Size 125 6
Vent Outlet Instructions for Sizes 25, 50,
75, 100, 165 and 200 6
Vent Outlet Instructions for Sizes 250,
300 and 400 7
Vent Outlet Positions 6
Vent Outlet Sizes 16
Vent System 37
Vent with Condensate Drain 17
Vertical Louvers 20
Supply Voltage 23, 24
W
Warranty 3
Weights 11
Wiring Diagrams 26