Table Of Contents - Aqua-Hot 375-d Service Manual

General Information
Danger, Warning, Caution, and Note Box Definitions ................................................... Page 6
Section 1: Introduction To The Aqua-Hot 375D
Technical Information ................................................................................................... Page 7
I.D. Label Sample ........................................................................................................ Page 8
Aqua-Hot Heater Overview........................................................................................... Page 9-11
Aqua-Hot Operational Flow-Chart ................................................................................ Page 12
Antifreeze and Water Heating Solution..............................................................Page 13-14
Section 2: Interior Switch Panel
Diesel-Burner Switch .................................................................................................... Page 15
Electric Element Switch ................................................................................................ Page 15
Switch Panel Wiring Schematic .................................................................................... Page 16
Section 3: Exhaust System
Exhaust System Requirements .................................................................................... Page 19
Section 4: Aqua-Hot Components
Interlock Switch ............................................................................................................ Page 20
Float Switch .................................................................................................................. Page 21
Diesel Burner Control Thermostat ................................................................................ Page 22-23
Electric Element Control Thermostat ............................................................................ Page 24-25
Electric Element High Limit Thermostat ....................................................................... Page 26
Diesel Burner High Limit Thermostat (Left) .................................................................. Page 27
Diesel Burner High Limit Thermostat (Right) ................................................................ Page 28
Low Temperature Cutoff Thermostat ............................................................................ Page 29-30
Interior Heating Zone Check Valve ............................................................................... Page 30-31
Domestic Water Tempering Valve ................................................................................ Page 32-33
Interior Heating Zone Circulation Pumps 1 & 2 ............................................................ Page 33-34
Stir Pump (Circulation Pump #2) .................................................................................. Page 35
Electric Heating Element .............................................................................................. Page 36-37
Electric Heating Element A.C. Relay ............................................................................ Page 38-39
Interior Heating Zone Relay - Fans .............................................................................. Page 40
Interior Heating Zone Relay - Pumps ........................................................................... Page 40
Section 5: Filling/Draining The Aqua-Hot 375D With Heating Solution
Filling the Aqua-Hot.......................................................................................Page 42-44
Draining The Aqua-Hot...................................................................................Page 45
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© 2009 Aqua-Hot 375D Hydronic Heating System Service Manual-Rev. A

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