MG & SG Series Boilers – Installation and Service Manual
7
2.3 LOCATION
MG and SG boilers are intended for indoor installation only. Observe the following minimum clearances
from the boiler to combustible materials:
Minimum Clearances to Combustible Materials
Sides Rear Top Front (service)
Model
in. mm in. mm in. mm in. mm
MG
2 51 2 51 24 610 18 457
SG
2 51 2 51 24 610 24 610
• Minimum clearance from the boiler front to combustible materials for SG and MG is 6 in (153 mm);
however, a front clearance of 18" (457 mm) for MG boilers and 24” (609 mm) for SG boilers is
recommended for servicing.
• Maintain a clearance of 6" (152 mm) from draft hood and the flue pipe in any direction.
• Allow ample space for boiler inlet and outlet connections, and gas connection.
• Boiler must be installed on a stable and level foundation.
• MG & SG Series boilers can be installed on a combustible floor but must not be installed directly on
carpeting.
• A hot water boiler installed above radiation level must be provided with a low water cutoff
device at the time of boiler installation.
• This boiler must be installed such that gas ignition system components are protected from water
(dripping, spraying, rain, etc.) during appliance operation and service.
2.4 GAS SERVICE PIPING
The boiler and its gas connection must be leak tested before placing the boiler in operation. The gas
controls furnished are suitable for a maximum operating gas pressure of 1/2 psi (14 inches water
column).
The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess
of 1/2 psig (14 inches water column).
The boiler must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing at test pressures equal to or less than
1/2 psig (14 inches water
column).
A manual main shut-off valve should be installed in the gas line outside the boiler jacket and as required
in Section 2.2. The valve should be readily accessible for turning on and off.
A drip pocket or sediment trap should be installed in the gas supply line upstream of the gas controls and
as close to the boiler as possible (example shown in Figure 3 in Section 6).
The pipe compound used should be resistant to the action of liquefied petroleum gases. Check for gas
leaks in piping before placing the boiler in operation by using a soap and water solution. DO NOT USE
AN OPEN FLAME.
INSTALLER MUST IDENTIFY EMERGENCY SHUT-OFF DEVICES.
All piping and fittings must be installed as per codes in Section 2.2.
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