Gas Piping - Thermal Solutions EVS SERIES Installation, Operating And Service Instructions

WARNING
Failure to operate the unit with the proper water
flow rate can lead to appliance failure. Always
verify proper water flow switch operation so that
the unit stops operating if improper water flow is
present.
Safety relief valve discharge piping must be
piped such that the potential of severe burns
is eliminated. DO NOT pipe in any area where
freezing could occur. DO NOT install any shut-
off valves, plugs or caps. Consult Local Codes
for proper discharge piping arrangement.
If a high head system pump is installed, ensure
that the boiler relief valve and system piping are
capable of operating properly at the combined
pressure of the system fill pressure plus the
pump static head pressure.
Do not install valves, plugs or caps in safety
relief valve piping.
Safety relief valve piping must be terminated
such that in the event the safety relief valve
opens, the discharge will not cause personal
injury or damage.
Do not operate the boiler with flow rates in
excess of the maximum flow rates listed in Table
2. Tube erosion and pitting will occur. Thermal
Solutions Standard Warranty does not cover
problems caused by excessive water flow rates.
.
8. There must be a minimum of five pipe diameters
of straight horizontal run downstream of the flow
switch. Otherwise, premature failure of flow switch
paddle may occur. See flow switch instruction
manual included with boiler.
9. If the boiler is installed in a closed water supply
system, such as one having a back flow preventer in
the cold water supply line, means shall be provided
to control thermal expansion. Contact the water
supplier or local plumbing inspector on how best to
control this situation.
10. A pressure relief valve is supplied with each boiler.
No valve is to be placed between the relief valve and
appliance.
a. Pipe the safety relief discharge to a suitable place
for disposal when relief occurs.
b. Do not install reducing couplings or other
restrictive devices in the safety relief discharge
line.
c. The safety relief discharge line must allow for
complete drainage of both the valve and line.
11. If the relief valve discharges periodically, this may
be due to thermal expansion in a closed water
supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation.
DO NOT PLUG THE RELIEF VALVE.
E

. GAS PIPING

Failure to properly pipe gas supply to boiler may
result in improper operation and damage to the
boiler or structure. Always assure gas piping is
absolutely leak free and of the proper size and
type for the connected load.
An Additional gas pressure regulator may be
needed. Consult gas supplier.
1. Size gas piping. Design system to provide adequate
gas supply to boiler. Consider these factors.
a. Allowable pressure drop from point of delivery
to boiler. Refer to Table 3 for minimum and
maximum boiler gas train inlet pressure at steady
state. If gas supply pressure is higher than
maximum as listed in Table 3, an additional field
supplied pressure regulator will be required.
b. If a lower minimum gas pressure is needed,
the low gas pressure build can be used. The
minimum gas pressure on all the low gas
pressure builds is 4.0 in. w.c. Consult factory if
this option is desired. This option is not available
on the EVS-500, 2000S, 2500 or 3000.
c. Maximum gas demand. Table 7 lists boiler input
rate. Also consider existing and expected future
gas utilization equipment (i.e., water heater,
cooking equipment).
d. Length of piping and number of fittings. Refer
to Table 4 for maximum capacity of schedule
40 pipe. Table 6 lists equivalent pipe length for
standard fittings.
i. Specific gravity of gas correction factor,
to be applied to the value found in Table 4,
can be found in Table 5.
ii. For gas piping material other than schedule
40 pipe, refer to the National fuel gas code,
NFPA 54/ANSI Z223.1 and/or CAN/GCA B149
Installation codes.
2. If step down regulator is required, it must be used in
conjunction with the factory supplied regulator and
be located as far away from the boiler as possible
to prevent nuisance shutdowns. The minimum and
maximum inlet gas pressure must not exceed the
value specified in Table 3.
3. Install field supplied sediment trap, ground-joint
union and manual non-displacable shut-off valve
upstream of factory supplied shut-off valve outside
the boiler jacket. Use methods and materials in
accordance with Local Codes and requirements
of gas supplier. In absence of such requirements,
follow National Fuel Gas Code, NFPA 54/ANSI
Z223.1 and/or CAN/CSA B149 Installation Codes.
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WARNING