Plumbing; Pressure Relief Valve - Bosch TRONIC 4000 C Installation Manual

7.2 Plumbing

It is mandatory that all plumbing be done in accordance with national, local, and
state plumbing codes and practices. Failure to properly install the water heater
WILL VOID the warranty.
Use thread tape according to best practice on plumbing connections.
1. Install unions on the hot and cold water connections to easily disconnect the
water heater for servicing. See Figure 8.
B efore connecting pipes to the water heater, fl ush the lines to eliminate
all residue and debris from the inlet and outlet lines.
2. Connect the water inlet line to the entry point of the heater (left side inlet),
and connect the outlet line to the water outlet. Use a line that can withstand a
minimum pressure of 150 psi. Using any other type of line will cause damage.
NOTICE: PRODUCT DAMAGE
 Do not apply heat to the Hot or Cold water heater
connections. If sweat connections are used, sweat tubing to
the adapter before fitting adapter to the water connections
on the heater. Any heat applied to the water heater
connections will permanently damage the water heater.
Damages due to improper installation practices ARE NOT
covered by warranty.
NOTICE: PRODUCT DAMAGE
 Failure of the water heater due to lime scale build-up on the
heating surface, low pH, or other imbalance IS NOT covered
by the warranty. See Section 3 Water Quality Requirements.
T he maximum operating water pressure of this water heater is 115 psi /
10 bar. Residential plumbing systems with unstable pressure or pressure
above 73 psi require the application of a pressure reducing valve, set to
58 - 73 psi.
 Minimum pipe size should match connection size.
 Drains and check valve between will assist in purging air from system.
 The installer is responsible for all equipment and components required by
local codes. In Massachusetts, you must install a vacuum relief valve per
248 CMR. 4.
Bosch Tronic TR4000C Electric Tankless Water Heaters- BTC 722203301 A (08.2022)
 A temperature and pressure (T&P) relief valve is not required for most
installations, but may be required to meet local, state, or provincial codes.
If codes require a T&P valve, install according to code and manufacturer
instructions.
 Mixing valve applications are recommended to help prevent scalding.
 It is highly recommended by the manufacturer to install water leak
detection devices and automatic shutoff valves in any water heater
installation where a leakage of water could result in property damages See
Figure 8.

7.2.1 Pressure Relief Valve

For protection against excessive pressures in this water heater,a pressure relief
valve (PRV) may be installed. Refer to local codes to see if the installation of a PRV
is required. Install the PRV (with a maximum set pressure of 150 psi) on the hot
outlet line of the water heater, and orient it or provide tubing so that any discharge
from the valve will exit at least 6" above the structural fl oor. The relief line cannot be
in contact with any live electrical parts. The discharge opening must not be blocked
or reduced in size under any circumstances.
T he pre-installed check valve is not a pressure relief valve.
Commonwealth of Massachusetts
As a condition of installing this product in the Commonwealth of Massachusetts a
pressure relief valve shall be installed on the hot water side, by a licensed plumber
MGL 142 Section 19. (Approval number: P1-09-25).
Cold
Figure 9
DANGER: PERSONAL INJURY, PROPERTY DAMAGE, PRODUCT
DAMAGE
 Do not thread a cap or plug into a relief valve or relief valve
line under any circumstances! Explosion and property
damage, serious injury, or death may result.
Installation Manual
Rubber
PRV *
Hot
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