Brochure
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83.025.013.024.043.074.033.074.043.084.093.045.033.
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1S3A– FDO8/3ro4/1
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1F6BM– EAS8/3
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22.211.348.155.200.297.279.177.220.238.242.261.359.
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2S9BM042S9EMFDO2/1
2F01BM– EAS2/1
54.318.448.229.301.392.470.382.431.383.450.313.440.
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2.4–042S01EMFDO2/1
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For complete specifications on these solenoid valves, refer to Bulletin 30-10.
Page 12 / BULLETIN 90-40
HOT GAS SOLENOID VALVES The selection of a
Sporlan Hot Gas Solenoid Valve involves some of the
same basic items already determined for the selection
of the discharge bypass valve plus one additional
factor:
1. Refrigerant.
2. Minimum allowable evaporating temperature at the
reduced load condition.
3. Hot gas bypass requirement in tons - this is not the
bypass valve capacity.
4. Allowable pressure drop across
va
lve port - since
excessive pressure drop across the solenoid valve
reduces the capacity of the DBV, the maximum pres-
sure drop for a Refrigerant 134a system should be
approximately 5 psi and for a Refrigerant 22 system
approximately 10 psi.
Capacity Ratings – Once the data listed above is
determined, the appropriate solenoid valve can be eas-
ily selected from the capacity table. Since the capaci-
ties for a given solenoid valve vary considerably with
a slight change in pressure drop, the best selection is
the one which keeps the pressure drop as low as pos-
sible while matching the solenoid valve and bypass
valve connections.
Example – Based on the data for the earlier DBV
selection: Refrigerant 22, 26°F minimum allowable
evaporating temperature at the reduced load condi-
tion, and either 10 tons or 4.5 tons as the hot gas
bypass requirement, the best solenoid valve selection
for each case would be:
For 10 tons: MB25S2, 7/8” or 1-1/8” ODF connections,
and the necessary voltage and cycles.
For 4.5 tons: MB14S2, 5/8” ODF connections, and the
necessary voltage and cycles.
The MB25S2 and MB14S2 would have a pressure
drop of less than 5 psi. Both selections depend on
whether adequate condensing pressure is maintained
y
ear round with some form of head pressure control.
See Bulletin 90-30 for Sporlan’s Head Pressure
Control Systems.