Table Of Contents - Natco Fire-Coil 175-400 Installation And Operation Instructions Manual

SECTION 1.
General Information
1A. Introduction................................................... 1
1B. Warranty ....................................................... 1
1C. Technical Assistance .................................... 1
SECTION 2.
Installation Instructions
2A. General Information ..................................... 2
2B. Field Assembly ............................................. 2
2C. Site Location ................................................ 3
2C-1. Installation Information ................................. 3
2C-2. Outdoor Installation (U.S. only) .................... 3
2C-3. Flooring - Typical Installation ....................... 4
2D. Combustion and Ventilation Air Supply ........ 4
2D-1. Outdoor Air Supply ....................................... 5
2D-2. Indoor Air Supply .......................................... 5
2D-3. Exhaust Fans or Vents ................................. 5
2E. Venting of Combustion Products .................. 5
2E-1. General Information ..................................... 5
2E-2. Replacement of Existing Heater ................... 6
2F. Water Flow ................................................... 6
2F-1. Reversible Water Connections ..................... 6
2F-2. Water Chemistry .......................................... 8
2F-3. Freeze Protection ......................................... 9
2F-4 Water Hardness ........................................... 9
2F-5. Pump Requirements ..................................... 9
2F-6. Pressure Buildup in Water System .............. 9
2F-7. Pressure Relief Valve ................................... 9
2F-8. Water Pressure ............................................ 9
2F-9. Pump Installation ........................................ 12
2F-10. Storage Tank Installation............................ 12
2F-11. Thermal Circulation of Hot Water in
Cold Water Supply Lines ............................ 12
2G. Gas Supply and Piping ............................... 13
2G-1. General Instructions ................................... 13
2G-2. Special Precautions for Propane Gas ........ 14
2H. Electrical Wiring ......................................... 14
2I. Combined Space Heating/Potable
Water Heating Systems ............................. 14
2I-1. Combined Space Heating .......................... 14
2I-2. Potable Water Heating ............................... 14
SECTION 3.
Operating Instructions
3A. Normal Operating Sequence ...................... 15
3B. Start-Up Procedure .................................... 15
3C. Setting the Temperature Controls .............. 15
3D. Adjustment for Minimum Input Rate
(models with modulating gas valve) ........... 18
3E. Hi-Limit Switch Checkout ........................... 18
3F. Shut-Down Procedure ................................ 18

TABLE OF CONTENTS

SECTION 4.
Maintenance
4A.
4B.
4C.
4C-1.
4C-2.
SECTION 5.
Troubleshooting
5A.
5A-1.
5A-2.
5B.
5B-1.
5B-2.
5B-3.
5B-4.
5B-5.
5B-6.
5B-7.
5B-8.
5B-9.
5B-10. Testing the High Voltage Ignition Lead ...... 25
5B-11. Testing the Safety Shutoff
5B-12. Testing the Safety Shutoff
5B-13. Testing the Igniter Electrode ...................... 26
5B-14. Testing the Pilot Thermocouple
5B-15. Testing for Pilot burner
5B-16. Testing for Burner Ignition
5B-17. Heater Will Not Shut Off ............................ 27
5B-18. On-Off Main Burner Cycling ....................... 27
5B-19. Testing the Terminal Strip/External
SECTION 6.
Parts List
6A.
6B.
General Instructions ................................... 18
Replacement of Gas Controls .................... 19
Heat Exchanger .......................................... 20
Inspecting the Heat Exchanger .................. 20
Cleaning the Heat Exchanger .................... 21
Gas Pressure Tests .................................... 21
Checking the Main Line Gas Pressure ....... 21
Checking the Manifold
Regulated Gas Pressure ............................ 22
Electrical Troubleshooting .......................... 22
Heater Does Not Come On ........................ 22
Testing the Transformer ............................. 23
Testing the Electrical Power Supply ........... 23
Testing the Manual Reset
Hi-Limit Switch ........................................... 23
Testing the Flow Switch ............................. 23
Testing the Fusible Link
(Flame roll-out switch) ................................ 24
Testing the Fuse ......................................... 24
Testing the Ignition Control
(for spark ignition) ...................................... 24
Testing the Ignition Control
(for standing pilot) ...................................... 25
(for standing pilot) ...................................... 26
(for automatic pilot) .................................... 26
(for standing pilot) ...................................... 26
(for spark ignition) ...................................... 26
(for standing pilot) ...................................... 27
Controls ...................................................... 27
General Information ................................... 28
Parts List .................................................... 28
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