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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
1B Tube erosion and pitting will occur. Thermal
Solutions Standard Warranty does not cover
problems caused by excessive water flow rates.
9. Refer to Table 1B for pressure drop, flow rates, and
temperature rise (ΔTs).
10. The factory supplied circulator is not intended to
replace the boiler supply circulator or the system
supply circulator. It provides a constant flow to the
primary heat exchanger.
11. 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
*20°F ∆T
BOILER
DP
MODEL
(Ft. hd)
EVCA-750
32.4
EVCA-1000
36.9
EVCA-1500
53.7
EVCA-2000
67.8
EVCA-3000
29.2
Note: * Indicates maximum allowable flow rate.
Table 1B- EVCA BOILER FLOW AND PRESSURE DROP
30°F ∆T
DP
GPM
GPM
(Ft. hd)
70
17.8
47
94
20.9
63
142
27.3
95
190
36.0
127
291
15.2
194
supplier or local plumbing inspector on how best to
control this situation.
12. 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.
13. 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.
40°F ∆T
DP
DP
GPM
(Ft. hd)
(Ft. hd)
11.6
35
8.3
13.9
47
10.2
16.9
71
11.7
23.0
95
16.2
9.6
146
6.7
20
50°F ∆T
60°F ∆T
DP
GPM
GPM
(Ft. hd)
28
6.3
23
38
7.9
31
57
8.6
47
76
12.2
63
116
5.0
97
70°F ∆T
DP
GPM
(Ft. hd)
5.0
20
6.4
27
6.7
41
9.6
54
3.9
83
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