Bulletin 100-60, August 2009 Electric Hot Gas Bypass Valves
PAGE 2 / Bulletin 100-60 10 FEATURES AND BENEFITS SDR-4 SDR-3, 3x ■ Direct temperature control ■ Tight shutoff when closed ■ Can be interfaced with direct digital controls or other building management systems ■ Functions as a standalone temperature control when used with a Sporlan TCB ■ Capacities up to 40 tons R-410A ■ Suitable for use with CFC, HCFC and HFC refrigerants ■ Proven reliable step motor design ■ High force output for unparalleled reliability ■ Corrosion resistant materials
Bulletin 100-60 / PAGE 3 electronic controllers. They can be set to automatically maintain a desired minimum evaporating temperature regardless of the decrease in evaporator load. As a result they are ideal for close tolerance temperature applications such as environmental chambers and process cooling. The primary advantage of this method is that the EHGB can directly control the temperature of the cooled fluid.
PAGE 4 / Bulletin 100-60 section. This will ensure obtaining rated capacity from the bypass valve at the conditions for which it was selected. If the evaporator is above or on the same level as the compressor, this valve location will also eliminate the possibility of hot gas condensing in the long bypass line and running back into the compressor during the off cycle.
Bulletin 100-60 / PAGE 5 Figure 3 External Equalizer Distributor Evaporator Return Air TEV See•All® Desuperheating TEV Solenoid Valve TCB Catch-All® SDR 4 Condenser Compressor In instances where the suction gas may be cool enough to not need further liquid injection, the TREV will not feed, saving energy. Request Bulletin 10-10-2 for more information.
PAGE 6 / Bulletin 100-60 All step motor valves, however, will remain at their current position if power is removed during operation. In some critical systems an additional hot gas solenoid may be desirable to ensure that no hot gas is bypassed during system or power failures. When used, the hot gas solenoid valve may be wired in series with a bi-metal thermostat fastened to the discharge line close to the compressor.
Bulletin 100-60 / PAGE 7 SPECIFICATIONS Motor Type: 2 phase permanent magnet, 2 coil bipolar Supply Voltage: 12 DC, -5% + 10%, measured at the valve leads Connections: 4 lead, 18 AWG, PVC insulation jacketed cable Phase Resistance: 75 ohms per winding ± 10% Current Range: . .131 to .215 amps/winding; .262 to .
PAGE 8 / Bulletin 100-60 MINIMUM ALLOWABLE EVAPORATOR TEMPERATURE AT REDUCED LOAD °F – Tons 40 Refrigerant 22 134a 404A/507 407C 410A 26 Model 80 5.4 9.8 17.9 3.8 6.5 13.3 6.0 10.7 19.9 5.4 9.8 18.3 9.1 16.3 29.7 SDR-3 SDR-3x SDR-4 SDR-3 SDR-3x SDR-4 SDR-3 SDR-3x SDR-4 SDR-3 SDR-3x SDR-4 SDR-3 SDR-3x SDR-4 100 6.9 12.6 25.2 4.7 8.6 18.4 7.3 13.5 26.2 6.6 12.9 25.0 11.3 20.3 39.9 120 8.7 15.9 34.8 5.5 11.1 23.8 8.6 16.6 31.8 8.2 16.4 34.1 13.6 24.5 49.7 80 5.4 9.9 19.4 3.6 6.5 14.2 6.3 10.8 23.
