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4.5 Test the Water System
WARNING: PERSONAL INJURY, PROPERTY DAMAGE
Ensure that the boiler is full of water before firing the burner.
Operating the unit without filling it will damage the boiler.
Such damage is not covered by the warranty, and may result
in property damage, severe personal injury, or death.
Perform fi ll test after installing the boiler's water system to make sure that the
system has been installed properly. Follow the instructions below to perform a fi ll
test on the water system.
Fill the boiler with water after checking that the chemical composition of
water meets the requirements mentioned in this manual.
Close the drain valve of the boiler.
Fill the boiler with water. The correct pressure will vary with each
application. The normal pressure of the residential system is 12psi. The
operating pressure must never exceed the relief valve pressure setting.
While filling with water for the first time and carrying out the operation
test, check for water leaks from the pipes. If there is a water leak, stop the
operation, repair the leak, and continue the operation.
This system may have residual substances that could aff ect water chemistry. After
fi lling the system with water and completing the water leak test, verify that water
pH and chlorine concentrations are within the acceptable range by performing
sample testing.
NOTICE: BOILER DAMAGE
Before operating the boiler for the first time, check if the
boiler is filled with water. To avoid boiler damage, remove all
air from the system.
Singular Combi Boiler - BTC 439003301 B (2021/07)
4.5.1 External Water Fill Connection
Read and follow the guidelines below for system piping of the boiler.
System application drawings are intended to explain the system piping
concept only
When installing a mixing valve on the DHW piping, ensure that the cold
water pressure does not exceed the hot water pressure.
For the upstream side of all circulator, use straight pipes with a minimum
diameter of ½" (12mm)
Provide a system expansion tank following the guidelines on page 16
Installations must comply with all local codes, IN Massachusetts, a vacuum
relief valve must be installed in the cold water line per 248 CMR.
Air Removal
The boiler and system plumbing layout must be confi gured to promote the
removal of air from the water. Air vents and bleeders must be strategically
placed throughout the system to aid in purging the air from the system during
commissioning of the boiler. The system must also employ the use of a strategically
located air removal device, such as an air scoop or micro-bubbler, designed to
remove the air from the water as it fl ows through the system.
Follow the installation instructions included with the air removal device when
placing it in the system ; air removal devices generally work better when placed
higher in the system. Always locate air removal devices in areas of the system that
have a guaranteed positive pressure, e.g., in close proximity to the water fi ll and
expansion tank
T he boiler has an air vent inside the product in order to purge air in the
system.
Expansion Tank
The size of expansion tank should be calculated according to the boiler capacity
and the amount of water in the system. It is important to locate the expansion tank,
and make-up water fi ll, on the inlet side of any circulator in the system, as doing so
will guarantee the lowest pressure in the system will be at least equal to the tank
and make-up water pressure.
Ensure the expansion tank cannot become isolated from the boiler anytime the
system is operating. Failure to follow these instructions may lead to discharge form
the pressure relief valve, which may result in property damage or injury.
Installation Instructions
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