Boiler Water Pipe Installation; Electrical Wiring - Baxi H2O 40 GL Manuel D'installation, D'utilisation Et D'entretien

4. Boiler Water Pipe Installation

Installation procedure for pipes and components for boiler water flow :
1.
Determine where the boiler, space heating, and water heater connections should be made based on the type of piping system that is either in place, or
is to be installed for a new hydronic system installation.
2.
Manufacturer recommends 1", or larger, pipe be installed for boiler between indirect tank and hot water boiler. If boiler water through the indirect tank
coil is controlled by a zone valve, a 1" zone valve is recommended.
3.
Central Heating Zone Pump System. For a system using central heating zone pumps, the water heater connection labeled "BOILER SUPPLY"
should be piped to the boiler supply piping after the air eliminator and before the space heating takeoffs. Mount the water heater circulator as close
as possible to the water heater, and make sure the flow arrow points toward the water heater. The use of shut-off valves is recommended for future
service convenience. The water heater connection labeled "BOILER RETURN" should be piped to the boiler return piping as close to the boiler
possible and after any flow control or check valves in the space heating return piping. The use of a union and a shut-off valve is manufacturer
recommended. Use of a check valve is required to prevent back flow through the water heater during operation of the space heating system.
4.
Central Heating Zone Valves System. For a space heating system that uses Zone Valves, refer to Figure 4. Replace zone circulators with valves. The
water heater connection labeled "BOILER SUPPLY" should be piped to the boiler supply piping after the air eliminator and before the Central Heating
system pump. Mount the water heater circulator as close as possible to the water heater, and make sure the flow arrow points toward the water
heater. The use of a shut-off valve is recommended for future service convenience. The water heater connection labeled "BOILER RETURN" should
be piped to the boiler return piping as close to the boiler as possible and after any flow control or check valves in the space heating return piping. The
use of a union and a shut-off valve is recommended. The use of a check valve is required to prevent back flow through the indirect water heater during
operation of the space heating.
When installing pipes and fittings on the threaded connections on the indirect water heater, all soldered joints shall be a
minimum of four inches away from the indirect water heater to provide enough room for the soldering process.
IV. ELECTRICAL WIRING
If a heating system is small and the installed boiler offers a terminal to power a central heating system pump and DHW pump, the complete heating system
can be controlled by the integrated boiler control built inside the boiler. When using this type of wiring configuration, the power draws of the central heating
pump and DHW pump must not exceed the amp draw allowed by the boiler integrated control. Refer to the boiler Installation, Operation and Maintenance
Manual for information.
Use a heating zone control if the boiler integrated control :
(1) cannot offer enough current draw for all pumps,
(2) do not have power terminals for all the pumps,
(3) the heating system is a zone pump and zone valve system
The DHW priority must be established by the heating zone control. Refer to the manuals of the heating zone control for instructions on wiring.
NOTICE
14
PN 615000250 REV. B [01/09/2019]