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Hydronic heating systems providing interior heat and continuous hot water.
Explains the meaning of NOTICE, CAUTION, WARNING, and DANGER symbols.
Covers fire/explosion risks, pressure, and hot exhaust warnings.
Key safety points for operation and gas smell procedures.
Appliance operates on AC/DC power; use specific antifreeze.
Key safety points for operation and turning off gas.
Diagram illustrating the heating system's operation sequence.
Details the functions and components of the relay control board.
Operation and reset procedure for burner/electric switches.
Guidelines for safe installation and routing of the exhaust system.
Warning about Carbon Monoxide (CO2) from heater exhaust.
Safety switch preventing operation without the access cover.
Steps to replace the interlock switch.
Monitors fluid level in the expansion bottle.
Monitors boiler tank temperature for heating control.
Steps to replace the control thermostat.
Safety measure for the electric heating element.
Steps to replace the AC high-limit thermostat.
Safety measure for the burner operation.
Prioritizes domestic hot water over interior heat.
Steps to replace the low-temperature cutoff thermostat.
Controls coolant priority between hot water and interior heat.
Steps to replace the 3-way valve.
Mixes hot and cold water for consistent output temperature.
Steps to replace the tempering valve.
Circulates fluid for heating and stirs tank contents.
Steps to replace the circulation pump.
Warning about hot coolant and surfaces.
Provides supplementary heat using an electric element.
Steps to replace the electric heating element.
Technical specifications for the propane burner.
Details the function and components of the propane burner.
Illustrates the propane burner's operational sequence.
Warning about incorrect jumper wire installation.
Purpose of the Fenwal card in controlling the propane burner.
Steps to troubleshoot the Fenwal control card.
Instructions for safely removing the propane burner.
Instructions for reinstalling the propane burner.
Caution to shut off gas supply before replacement.
Functions to ignite the propane/air mixture.
Caution regarding the hot surface igniter.
Steps to replace the hot surface igniter.
Danger of electric shock from power supplies.
Warning not to use RV/Marine antifreeze in the system.
Warning about disconnecting power before service.
Danger of electric shock during testing.
Warning about correct blower fan orientation.
Danger of using non-GRAS propylene glycol.
General| Model | 250D |
|---|---|
| Type | Hydronic Heating System |
| Fuel Type | Diesel |
| Heating Capacity | 25, 000 BTU/hr |
| BTU Output (Burner) | 25, 000 BTU/hr |
| Number of Zones | 3 |
| Electrical Requirements | 12V DC |
| Voltage | 12V DC |
| Hot Water Capacity | Continuous |
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