Warnings Concerning The Gas Supply; Confirming The Unit's Gas Type; Gas Type Conversion; Boiler Startup Procedure - Bosch SSB800 SA Installation And Service Instructions For Contractors

32 | Commissioning
5 .4

Warnings concerning the gas supply

When starting up the unit for the first time the following must be checked:
• That the unit is supplied with the type of fuel that it is configured to
use.
• That the gas supply system is provided with all the safety devices and
controls required under current national and local codes.
• The ignition system shutoff device must be tested by closing manual
gas valve and having ignition system cycle until unit goes into safety
shutoff.
• That the vent and combustion air terminals are properly connected
and free from any blockages.
• That the condensate drain tube is properly connected.
5 .4 .1

Confirming the Unit's Gas Type

The type of gas and the gas supply pressure that the unit is set up for is
listed on the rating label. The SSB Series boilers can operate using one
of the following two gases:
NATURAL GAS
• Maximum supply pressure = 20" W.C. (50.0 mbar).
• Minimum supply pressure = 3.5" W.C. (8.7 mbar).
PROPANE (LP) GAS
• Maximum supply pressure = 20" W.C. (50.0 mbar).
• Minimum supply pressure = 8" W.C. (19.9 mbar).
5 .4 .2

Gas Type Conversion

If the gas available at the installation site is not the type the boiler is
configured to use, the boiler must be converted. Special conversion
kits are available for this purpose inside the boiler. The gas conversion
procedure may be found in Section "4.6.4 Gas Type Conversion" pag.
22. Conversion must be carried out by a qualified technician.
5 .5

Boiler startup procedure

To start the boiler, do the following:
• Open the manual gas shut off valve.
• Turn ON the main power switch.
• Push all Module power switches to ON ("Electrical box" page 20).
• To help removing the air from the hydraulic circuit, the De-airing
function can be started for each module. When activated, the "De-Air"
sequence starts at every power ON and consists of a controlled
cycling of the pumps OFF and ON that takes 14 minutes, during which
no demand will be served. If the water pressure is too low and the
water pressure switch is in error, the sequence will be suspended until
the pressure switch is ON again. This function can be started through
the Service display, connecting it to each module and switching the
De_Air_Config parameter from 0 to 1. More details are available on
the Control System Manual.
6720866942 (2018/06) US
• The Touchscreen Control Panel will switch on. The Splash/Home
screen consists of the BOSCH logo:
Fig. 41 Touchscreen Control Panel Splash/Home screen
By touching the logo, the Cascade screen will be accessed:
Settings
Fig. 42 Cascade Screen
• Pushing the Settings button, the Settings screen will show up:
Reset Curve
Language
Demo option
Fig. 43 Settings screen
• Date and Time can be adjusted through the screen below:
Fig. 44 Date & Time screen
Date & Time
Units conversion
Module input rate
SSB