6720866942 (2018/06) US SSB
22 | Installation
4.6 Gas supply piping
SSB 800 SA and 1000 SA boilers contain a 2 inch NPT gas inlet
connection on the upper side of the unit as shown in Fig. 12.
SSB 1000 TL is equipped with 3 inch anged connection, still on the
upper side of the unit Fig. 13.
WARNING: The boiler and its gas connection must be leak
tested before placing the boiler in operation. Never use
matches, candles, ames or other sources of ignition to
check for gas leaks.
CAUTION: Many of the soaps used for gas pipe leak testing
are corrosive to metals. Therefore, piping must be rinsed
thoroughly with clean water after leak checks have been
completed.
NOTE: All gas piping must be arranged so that it does not interfere with
removal of any covers, inhibit service/maintenance, or restrict access
between the unit and walls, or another unit.
NOTE: The boiler shall be installed such that the gas ignition system
components are protected from water (dripping, spraying, rain, etc.)
during appliance operation and service (circulator replacement,
condensate trap, control replacement, etc.).
• Prior to installation, all pipes should be de-burred and internally
cleared of any scale, metal chips or other foreign particles. Do Not
install any exible connectors or unapproved gas ttings. Piping must
be supported from the oor, ceiling or walls only and must not be
supported by the unit.
• A suitable piping compound, approved for use with natural gas,
should be used. Any excess must be wiped off to prevent clogging of
components.
• To avoid unit damage when pressure testing gas piping, isolate the
unit from the gas supply piping. At no time should the gas pressure
applied to the unit exceed 20” W.C. Leak test all external piping
thoroughly using a soap and water solution or suitable equivalent. The
gas piping used must meet all applicable codes.
• A sediment trap / drip leg must be installed on the gas supply piping.
• Installation of a union at the appliance gas line connection is required
for ease of service.
4.6.1 Gas Supply Specications
The gas supply input specications to the unit for Natural Gas are as
follows:
• The maximum static pressure to the unit must not exceed 20” W.C.
• The gas supply piping and pressure to the unit must be of sufcient
capacity to provide 788 cfh for SSB 800 SAA and 1010 cfh for SSB
1000 SA / 1000 TL, while maintaining the recommended gas pressure
at 8” W.C. (or higher) for burners operating at maximum capacity.
4.6.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream
of the boiler. Maximum allowable gas pressure to the boiler is 20” W.C.
Should overheating occur or the gas supply fails to shut off, do not turn
off or disconnect the electrical supply to the pump. Instead, shut off the
gas supply at a location external to the appliance.
4.6.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping
under most conditions. Regulators must conform to the following
specications:
• The external natural gas regulator must be capable of regulating
a) 100,000 - 798,000 BTU/HR for SSB 800 SA
b) 100,000 – 1,024,000 BTU/HR for SSB 1000 SA / 1000 TL
of natural gas while maintaining a recommended gas pressure of
8.0” W.C. (or higher) to the boiler.
• A regulator MUST be used when gas supply pressure will exceed 20”
W.C.
The following are BOSCH’s recommendations for installation of gas
pressure regulator, unless superseded by state and local codes and the
regulator manufacturer’s specications:
• Horizontal installation of gas pressure regulators is recommended
unless stated otherwise by the regulator manufacturer. Consult the
manufacturer for additional recommendations and installation options.
• For all SSB boilers, when installed horizontally the required distance
between the gas pressure regulator and the nearest pipe tting, elbow
or valve is 10 feet.
• When pipe size reduction is required, use only bell reducers.
MASSACHUSETTS INSTALLATIONS ONLY
For Massachusetts installations, a mandatory external gas supply
regulator must be installed. The gas supply regulator must be properly
vented to outdoors. Consult the local gas utility for detailed requirements
concerning venting of the supply gas regulator.
The Commonwealth of Massachusettes prohibits the use of copper tubing
for the gas line.
NOTE: It is the responsibility of the customer to source and purchase the
appropriate gas regulator as described above.
4.6.4 Gas Type Conversion
The heating unit is factory preset for operating with natural gas. This
set-up can be changed using the conversion kits supplied by the
manufacturer, on demand.
The kit (identied exteriorly by part number) consists of:
• two (2) orices (one for each gas valve), marked to indicate their size;
• one (1) conversion label including the following:
- boiler model number;
- the gas to which the boiler has been converted;
- minimum and maximum inlet gas pressures of the converted
boiler;
- manifold pressure;
- input rating;
- identication of the conversion kit by part number.
• one (1) step by step instruction document.
WARNING: The conversion kit shall be installed by
a qualied service agency in accordance with the
manufacturer’s instructions and all applicable codes and
requirements of the authority having jurisdiction. If the
information in these instructions is not followed exactly, a
re, an explosion or production of carbon monoxide may
result causing property damage, personal injury or loss
of life. The qualied service agency is responsible for the
proper installation of the kit. The installation is not proper
and complete until the operation of the converted appliance
is checked as specied in manufacturer’s instructions
supplied with the kit.
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