Roberts Gorden 300, 200, 350, 150, 400, 250, 225, 175 service manual Roberts-GordonLLC, Printed in U.S.A

TABLE OF CONTENTS
SECTION 1: Heater Safety		1
1.1 Manpower Requirements		1
1.2 Safety Labels and Their Placement		1
1.3 California Proposition 65		1
2.1	Wall Tag	5
2.2	Corrosive Chemicals	5
2.3	National Standards and Applicable Codes	5
SECTION 3: Critical Considerations		6
3.1	Basic Information	6
3.2	Manufactured Units	6
3.3	Location and Suspension	6
3.4	Minimum Required Installation Clearances	6
3.5	Ventilation	6
3.6	Gas Supply	6
3.7	Electrical Supply	6
3.8	Vent	6
SECTION 4: Clearances TO combustibles		7
4.1	Required Clearances To Combustibles	7
4.2	Clearances To Combustibles	7
SECTION 5: National Standards and Applicable Codes		8
5.1	Gas Codes	8
5.2	Aircraft Hangars	8
5.3	Parking Structures and Repair Garages	8
5.4	Electrical	8
5.5	Venting	8
5.6	High Altitude	9
SECTION 6: Heater installation		10
6.1	General	10
6.2	Suspension	10
SECTION 7: Venting		11
7.1 Venting		11
7.2 Vent Installation		11
7.3 Unvented Operation		12
7.4 Horizontal Venting		12
7.5 Vertical Venting		12
7.6 Length Requirements		12
7.7 Vent Material		13
7.8 Replacing an Existing Heater in a Venting System		13
SECTION 8: Air Supply		18
8.1	Separated Combustion Installation	18
8.2	Unvented Installation	18
8.3	Building Ventilation	18
8.4	Outside Combustion Air Supply	18
SECTION 9: Gas Piping		19
9.1	Connections	19
SECTION 10: Wiring		21
10.1 Positioning Thermostats		21
10.2 Low Voltage Thermostat with One Heater		21
10.3 Low Voltage Thermostat with Multiple Heaters
	(Models UHA[X][S]150 - 250)	22
10.4 Low Voltage Thermostat with Multiple Heaters
	(Models UHA[X][S]300 - 400)	23
10.5 UHA[X][S] Series Internal Wiring Diagram		24
10.6 UHA[X][S] Series Ladder Wiring Diagram		25
10.7 Electrical Connection to the Heater		26

SECTION 11: Operation and Maintenance		27
11.1 Pre-Start-Up Checks		27
11.2 Begin Start-Up		28
11.3 Complete the Start-Up		30
SECTION 12: User Instructions		31
12.1	Heater Operation	31
12.2	Lighting Instructions	31
12.3	Simple Troubleshooting	31
SECTION 13: Servicing		32
13.1	Servicing Instructions	32
13.2	Burner Maintenance	32
13.3	Fan/Motor Assembly Maintenance	32
13.4	Heat Exchanger Maintenance	32
13.5	Gas Valve Maintenance	32
13.6	Flue Blower	32
13.7	Venting and Air Intake Pipe	33
13.8	Maintenance Checklist	33
SECTION 14: Troubleshooting		35
14.1	General	36
14.2	Troubleshooting For Automatic Ignition Burner
	Systems	37
14.3	Troubleshooting for Flame Supervision System	38
14.4	Troubleshooting for Gas Valves	39
14.5	Troubleshooting for Flue Blower	39
SECTION 15: Replacement Parts		40
15.1	Gas Valve	40
15.2	Burner Compartment	41
15.3	Ignition Electrode and Flame Probe	42
15.4	Heat Exchanger	43
15.5	Louvers and Louver Spring	43
15.6	Flue Blower	44
15.7	Pressure Switch	45
15.8	Ignition Control	45
15.9	Axial Fan/Guard/Motor Assembly	45
15.10 Limit Switches		46
SECTION 16: Specifications		47
16.1	Dimension Data	47
16.2	General Technical Data Table	48
16.3	Technical Data Table	48
SECTION 17: The ROBERTS GORDON® COMBAT®
	UHA-Series Warranty	50

©2012 Roberts-Gordon LLC

All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping or information storage and retrieval systems - without the written permission of Roberts-Gordon LLC.

Printed in U.S.A.