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Dual Fuel Supplemental Manual
Models: FBD 751 - 2001
DIR #2000508
DIR #2000508187
This manual must only be used by
WARNING
a qualified heating installer / service
technician. Read all instructions,
including this manual along with
the Crest Installation and Operation
Manual, and the Crest Service Manual,
before installing. Perform steps in the
order given. Failure to comply could
result in severe personal injury, death,
or substantial property damage.
Save this manual for future reference.
100268179_2000509263 Rev A
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Table of Contents
Related Manuals for Lochinvar Crest FBD 751
Summary of Contents for Lochinvar Crest FBD 751
- Page 1 100268179_2000509263 Rev A Dual Fuel Supplemental Manual Models: FBD 751 - 2001 DIR #2000508187 DIR #2000508 This manual must only be used by WARNING a qualified heating installer / service technician. Read all instructions, including this manual along with the Crest Installation and Operation Manual, and the Crest Service Manual, before installing.
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Page 2: Table Of Contents
CONTENTS HAZARD DEFINITIONS ............ 2 2. START-UP PLEASE READ BEFORE PROCEEDING ......3 Start the Boiler ..............8 THE CREST -- HOW IT WORKS ........4 Check System and Boiler ............ 8 RATINGS ................5 Operating Instructions ............9 1. GAS CONNECTIONS Check Flame and Combustion ......... -
Page 3: Please Read Before Proceeding
Dual Fuel Supplemental Manual Please read before proceeding Installer – Read all instructions, including When servicing boiler – WARNING this manual, the Crest Installation and • To avoid electric shock, disconnect electrical supply Operation Manual and the Crest Service before performing maintenance. Manual, before installing. -
Page 4: The Crest -- How It Works
Dual Fuel Supplemental Manual The Crest Dual Fuel - How it works... 8. Large natural gas valve (Valve 2 Natural) 1. Propane gas connection The large natural gas valve senses the negative pressure created The propane gas connection pipe is a threaded black iron pipe by the blowers, allowing gas to flow only if the gas valves are connection. -
Page 5: Ratings
Dual Fuel Supplemental Manual Ratings Crest Other Specifications AHRI Rating Vent Weight AHRI Model Number Gross Input Appliance Size w/Water Ratings Output Pipe Pipe Water Gas Inlet (lbs.) Water, Size Size Size Content Size Note: Change “N” to Outlet Inlet (Notes 4 - 8) Gallons “L”... -
Page 6: Gas Connections
Dual Fuel Supplemental Manual Gas connections Table 1A First Stage Piping at High Pressure_10 PSI Nominal Iron Pipe Length of pipe or tubing, feet Size Inches Maximum Capacities of Pipe in KBTUH/Hr 2442 1885 1580 1382 1240 1133 1048 Pipe 4831 3812 3230... -
Page 7: Gas Pressure
Dual Fuel Supplemental Manual Gas connections (continued) Do not check for gas leaks with an open Ignition problems are especially noticeable in NEW LP WARNING flame -- use the bubble test. Failure to installations and also in empty tank situations. This can use the bubble test or check for gas leaks also occur when a utility company shuts off service to an can cause severe personal injury, death, or... -
Page 8: Start-Up
Dual Fuel Supplemental Manual Start-up Final checks before starting the boiler Check vent piping and air piping 1. Check for gastight seal at every connection, seam of air Read the Crest Service Manual to familiarize yourself piping, and vent piping. with SMART TOUCH control module operation. -
Page 9: For Your Safety Read Before Operating
Dual Fuel Supplemental Manual Start-up (continued) Figure 2-1 Operating Instructions FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. •... -
Page 10: Check Flame And Combustion
Dual Fuel Supplemental Manual Start-up Once the heater analysis is complete, test the safety shutoff Check flame and combustion device by turning the manual shutoff valve to the OFF position and ensuring the heater shuts down and registers an 1. Turn the main power off to the boiler by placing the alarm. - Page 11 Dual Fuel Supplemental Manual Start-up (continued) 3. Turn off all shutoff valves for the fuel not in use (FIG. 2-3). 4. Turn on the shutoff valve for the one in use. 5. Turn the main power ON. Figure 2-3 Shutoff Valves 6.
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Page 12: Diagrams
Dual Fuel Supplemental Manual Diagrams Figure 3-1 Ladder Diagram... - Page 13 Dual Fuel Supplemental Manual Diagrams (continued) Figure 3-2 Wiring Diagram WARNING BOX DEPICTS OPTIONAL ITEMS DISCONNECT POWER BOX DEPICTS DUAL SENSOR BEFORE SERVICING SINGLE HOUSING BOARD X1-1 LARGE CONNECTION BOARD X1-2 LOW VOLTAGE X1-3 CN6-3 X6-3 120 VAC SHIELD INTEGRATED CONTROL CN6-2 X6-1 MODBUS...
- Page 14 Dual Fuel Supplemental Manual Notes...
- Page 15 Dual Fuel Supplemental Manual Notes...
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Page 16: Revision Notes
Revision Notes: Revision A (Change #500001029) initial release. MM #100268179_DIR #2000509263 Rev A 10/15...
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