Fired Up!
Adding glycol to a hydronic system does what?
Reduces heat transfer
Low water cutoffs are required on all boilers (True or False)
True
What can cause cavitation?
Air in the system
What control directly operates the zone valve motor?
Thermostat
What controls the temperature of the water in the boiler?
Aquastat
How do you find the actual delta T on a boiler?
Supply minus return
What is the most commonly used type of expansion tank?
Diaphragm-type
Temperature and pressure of water have a ______________ proportional relationship
Dirrect
The low water cut-off shuts off what?
Burner and circulating pumps
The reason we use an expansion tank on hydronic heating systems is because?
Water does not compress
What is the purpose of fluxing a joint before soldering?
To clean the joint for capillary action
If the pressure in a residential hydronic system is at 28#, what should you look for?
Pressure reducing valve may be stuck open
What is the voltage used to operate a zone valve motor?
24V AC
The TH terminal on a zone valve goes to what?
Zone Valve Motor
The wiring from the gas valve should be connected to what 2 terminals inside the aqua-stat relay?
B1 and B2
When is an automatic float type air vent closed to the atmosphere?
When it is full of water
The boiler pump on a 90% plus unit should be mounted where?
So the inlet is near expansion tank connection
The recommended hole to drill out for finn tubed baseboard risers would be _____ Larger than the pipe size.
1/2 inch
What type of hydronic system uses water temperatures that normally do not exceed 120 degrees?
In floor Heat
What temperature difference (Delta T) are we looking for in residential boilers?
20 degrees
Where is it acceptable to use 50/50 non-lead free solder?
Non potable water lines
Where should you install the Make-up Air Valve on a boiler?
There is no such thing as a make-up air valve
Which of the following components would not be controlled by an aquastat controller?
zone valve
Why must we be careful not to overheat the pipe we are soldering?
Burn the Flux
The reason for a mixing valve (3 Way) on in-floor heat is to ___________
Reduce the water temp