Heating I Section#2 Hot Water Boiler Quiz#3

This study session deals with normal operating controls.

The estimated completion time for this study session is ninety minutes.

Objectives
At the end of this study session, you should be able to:

• Describe eight normal operating controls.
• List the common problems found with these operating controls.

List the six operating controls that we may find on a hydronic system.

1. Thermostat
2. Pressure reducing valve
3. Primary control
4. Pump control
5. Zone valves 
6. Outdoor air thermostat

List three ways that the system can control a circulator (pump).

1. The pump can be controlled by water temperature
2. The pump can be controlled by the burner control including the thermostat
3. The pump can be be wired to run continuously when there is electrical power to the boiler.

What is the function of the pressure reducing valve?

The pressure reducing valve drops the domestic water pressure (e.g., 60 psi.) down to the pressure required in the hydronic system (e.g., 15 psi.).

What is the purpose of an automatic air vent on a boiler? Are they mandatory?

Automatic air vents get rid of air in the boiler water. They are not mandatory.

What is the purpose of zone control in larger houses?

Zone control allows different areas to receive different amount of heat to minimize cost, or maximize comfort. There are typically multiple thermostats in homes with zone control.

In a two-story Victorian home you find a pressure reducing valve set to 12 psi. Is there a possibility that this valve is set too low?

No

Is it possible for a boiler to function without a pressure reducing valve?

Yes

You find a boiler with a low temperature limit or primary control. What would be a typical setting for this control?

140F

We should test normal operating controls.

True