22
Rev 2.1
Testing Gas Line
Caution: The boiler must be disconnected from the gas supply during any pressure testing of the gas supply at test
pressures in excess of ½ psi (14" w.c.).
WARNING: The boiler must be isolated from the gas supply piping system by closing the upstream manual shut – off
valve during any pressure testing of the gas supply system at test pressures equal to or more than ½ psi (14" w.c.).
Relieve the pressure in the gas supply line prior to reconnecting the boiler and its manual shut off valve to the gas supply
line. Failure to follow this procedure may damage the gas valve. Gas valves damaged by high gas pressures are not
covered by the warranty. The boiler and its gas connections must be tested for leaks before operation of the units.
Figure 2.6. Manual Shut-Off Valve
Caution: Do not use Teflon tape on gas line thread. A pipe compound rated for natural and propane gases are
recommended. Apply sparingly only on the male pipe ends, leaving the two end threads bare.
Gas Pressure Supply
Input may decrease if gas pressure falls below these values. The maximum gas supply pressure is 14" w.c. for all Atlas
units. If gas pressure exceeds 14" w.c an intermediate gas pressure regulator of the lockup type must be installed. If gas
pressures less than those provided below are used, input may be decreased.
A050 A075 A100 A150 A200 A250 A300
NaturalGas 5"5"5"5"7"7"9"
Propane 5"5"7"7"9"9"9"
Table 2.2 Required Gas Pressure Supply
When connecting additional gas utilization equipment to the gas piping, the existing piping must be checked to determine
if it is adequate for the combined load.
2-8 Pump Installation
Caution: The supplied pump installation and maintenance manual must be read and followed before installation or wiring
pumps. If pump installation instructions in this O&M differ from Wilo Top Z O&M, the Wilo O&M shall supersede these
instructions.
Warning: Electrical Shock Hazard!
1) Electrical work must be done by qualified electricians only.
2) National Electrical codes, local codes and regulations must be followed.
3) All electrical connections must be performed after the electrical supply has been switched off and secured against
unauthorized switching.
Warning: Depending on installation, the pump/motor can become extremely hot. To avoid risk of burning, handle pump
with heat resistant gloves or ensure the pump is cool before handling the pump.
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