Table of Contents
Advertisement
6.10
Testing gas and water connections for leaks
NOTICE:
System damage!
Pressure, control and safety equipment may be damaged by excessive
pressure.
▶ When you carry out a leakage test, make sure that no pressure,
control or safety equipment is installed that cannot be isolated from
the test pressure.
▶ The boiler and its dedicated shutoff valve must be disconnected from
the gas supply piping system during any pressure testing of that
system at test pressures in excess of 14" W.C. (35 mbar).
Water connections
▶ Open the heating supply and return valves and fill the heating system.
▶ Check all connections for leakage (test pressure: Max. 30 psi (2.07
bar) on the pressure gauge).
Gas line
▶ Close the gas shutoff valve to protect the gas valve from damage.
▶ Check all connections for leakage (test pressure: Max. 60" W.C. (150
mbar)).
▶ Release pressure.
7
Elecrical connection
DANGER:
Risk of electric shock!
▶ Before working on the power supply (120 VAC), disconnect the
boiler from the grid by shutting off the emergency shutoff switch or
disengaging the heating system circuit breaker. Take measures to
prevent accidental reconnection.
▶ It is not sufficient to simply shut off the controls.
▶ Observe all applicable electrical codes and regulations.
Electrical components must be installed by a trained and certified
electrician and the installation must meet the National Electric Code as
well as all applicable local codes and regulations.
The boiler must be properly electrically grounded in accordance with the
requirements of the authority having jurisdiction or, in the absence of
such requirements with the National Electrical Code, ANSI/NFPA 70
and/or the Canadian Electrical Code Part I, CSA C221.1, Electrical
Code.
Provide a dedicated circuit breaker for the boiler and heating system
rated at least 15A. All line voltage wiring must use at least AWG14 size
cables.
All appliance modulation, control and safety components are tested and
pre-wired for use.
Observe safety precautions and all rules and regulations required by
local code and the National Electric Code.
Fuses
The appliance is protected with a fuse. It is located on the circuit board
( Fig. 9, page 16).
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
Replacement fuses can be found on the back of the cover ( Fig. 103,
page 92).
Controls and modules
For installation and electrical connection of controls and modules, see
the installation instructions of the accessory.
7.1
Electrical connections in the junction boxes
7.1.1
Access to junction boxes
All the electrical connections are available via the two installer junction
boxes, either high voltage (120 VAC) and low voltage (<24V DC).
TT
BUS
out sen
LWCO
DHW sen
1
2
3
4
5
6
2
Fig. 42 Installer junction boxes with covers removed
[1]
High voltage junction box
[2]
Low voltage junction box
7.1.2
Connecting the BUS-System
Connect only Bosch room controls to the internal BUS of this boiler. For
further details see the technical documentation of the BUS system
components (e. g. CRC200 and CZM100).
Fig. 43 Low voltage (LV) connections
Elecrical connection
1
6720810590-68.1Wo
47
Advertisement
Table of Contents
