Laars FT Series, Инструкция по установке и эксплуатации, Страница: 41 / 92

The FT Series Wall Mounted, Combination Boiler
Page 41
Use at least the MINIMUM pipe size for the entire
boiler loop piping (connecting boiler to and from
the primary/secondary connection). Use only
primary/secondary piping as shown. Failure to
follow these guidelines could result in system
problems.
CH pipe minimum size : 1 1/4˝
DWH pipe minimum size : 3/4˝
CAUTION
For guidelines in the use of Glycol Products.
Please refer to Section 8.4 on page 74
CAUTION
CAUTION
Scalding Risk: Manufacturer
strongly recommends the
use of an anti-scald mixing
valve at domestic hot water
outlet (boiler location) to
reduce potential for scalding.
Contact Manufacturer for
recommended models.
Check with local codes.
__________________________________________
4.15
Plumbing Guidelines
4.15.1
External Plumbing and Water
Connection Guidelines
- Ensure pipe material meets local codes and industry
standards.
- The pipe end must be clean and free of debris.
- Do not apply torch heat within 12˝ of the bottom
connections of the unit.
- The DHW inlet and outlet connections are 3/4”.
The CH supply and return connections are 1”. The
system piping must be a min. of 1-1/4” (see Sections
4.15.4 & 4.15.5 for details).
- Isolation valves (shutoff valve) will be used.
- All piping should be insulated.
4.15.2
Applicable Backflow Preventer
- Apply a backflow preventer valve in the DHW supply
inlet (water Inlet) to the unit as required by local
codes.
4.15.3
Diaphragm type Expansion tank
- The air in a diaphragm-type expansion tank is
separated from the water by a flexible rubber
membrane. When the tank is installed in and
connected to the piping of the system, water enters
the other side of the tank chamber and presses
down on the diaphragm.
- You should always install an ‘Automatic Air Vent on
the top of the air separator to remove
residual air from the system.
- Automatic air vent has been installed on the inside of
the boiler.
- The installation of an additional air vent is optional.
- If the boiler is installed in a closed water supply
system, such as one having a backflow preventer
in the cold water supply line, it will control thermal
expansion.