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Expansion Tank
The expansion tank should be installed in the system pipes in order to prevent
excessive pressure in the heating pipes.
When installing the expansion tank, follow the guidelines below.
If the air separator is located on the suction side of the system circulator,
connect the air separator to the expansion tank.
Singular boiler has a connection (water fill connection) for additional
water. Therefore, in most cases, an additional water fill connection is not
necessary.
If an additional water fi ll connection is necessary for special use, install
the water fi ll connection at the same location as the expansion tank's
connection to the system.
When replacing the expansion tank, refer to the literature of the expansion
tank manufacturer for selecting the proper size.
When installing the diaphragm expansion tank, always install an automatic
air vent at the top of the air separator in order to remove residual air in the
system.
Isolation Valves and Unions
This boiler system requires a full port ball valve. If a full port ball valve is
not used, water may fl ow at a limited fl ow rate through the boiler.
It is recommended to use unions for the serviceability of the device.
Pressure Relief Valve
This boiler comes with an ASME-approved pressure relief valve to install space
heating. To complete the installation of the boiler, you must install an approved
3/4", maximum 30 PSI (for space heating).
WARNING: PERSONAL INJURY, PROPERTY DAMAGE
Improper installation of the pressure relief valve may result
in property damage, personal injury, or death. Follow all
instructions and guidelines when installing the pressure
relief valve. Only a licensed professional should install the
valve.
CAUTION: PERSONAL INJURY, PROPERTY DAMAGE
Install the pressure relief valve as close to the boiler as
possible. No valve should be installed between the pressure
relief valve and the boiler.
Space heating return
Space heating supply
Figure 11
Singular Combi Boiler - BTC 439003301 B (2021/07)
4.1.3 Space Heating Piping
When connecting the space heating system, follow these guidelines.
4.2 Installing a Domestic Hot Water(DHW) System
The boiler can supply domestic hot water continuously when the fl ow rate is
detected by the fl ow switch. This is the most appropriate way to minimize standby
losses and improve the combustion effi ciency.
4.2.1 Guidelines for a DHW System
The boiler is designed to provide space heating and domestic hot water.
This boiler is equipped with the fl ow switch, and when approximately 0.5GPM or
more water fl ows, the fl ow switch will sense such water fl ow. The boiler will then
switch to the DHW mode immediately regardless of the space heating system's
status.
Read and follow the guidelines stated below for the safety and proper installation of
DHW system.
Scald Hazard
The hotter the water, the higher the risk of burns. If the DHW temperature is set too
high, there is a risk of burns from domestic hot water. Make sure to follow the usage
guidelines in the user manual.
Water Quality
If the quality of water cannot meet the EPA standard, appropriate boiler
maintenance is required. Any damage resulting from bad quality of water voids the
warranty. The following table shows the permitted maximum contaminant levels
based on the EPA National Secondary Drinking Water Regulations (40 CFR Part
143.3).
Pressure relief valve
Table 5
Tighten the connection valves carefully in order to avoid damage.
After installing the boiler, check if the space heating water flows smoothly
and if there is a water leak. Inform the boiler owner of the fact that the
strainer should be cleaned periodically to maintain the smooth flow of
space heating water. (The strainer is located on the side of the space
heating return.)
NOTICE: PRODUCT DAMAGE
Bosch suggests the installation of a dirt/magnetic separator
(boiler filter) on the system return line to help eliminate
sludge and particles from entering and damaging the boiler
components.
Contaminant
Total Hardness
Aluminum
Chloride
Copper
Iron
Manganese
pH
Sulfate
Total Dissolved Solids (TDS)
Zinc
Installation Instructions
Maximum Allowable Level
200 mg/l (12 grains/gallon)
0.05 – 0.2 mg/l
250 mg/l
1.0 mg/l
0.3 mg/l
0.05 mg/l
6.5 – 8.5
250 mg/l
500 mg/l
5 mg/l
| 17
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