Compressor Acoustic Cover - Each compressor shall be provided with a removable compressor cover using 1.2-2# density acoustical fiberglass surrounded by a tough, durable, weather-proof, flame resistant covering. Compressor Crankcase Heater - Each compressor shall be provided with a wraparound electrical cable resistance heater used to prevent migration and condensation of liquid refrigerant to the compressor crankcase while system is off. 2.4 Evaporator Coil Section A. The direct expansion evaporator coil shall be configured for draw-thru airflow design for uniform air distribution across the coil face. It shall be made with heavy wall seamless copper tubes mechanically expanded into tempered aluminum fins with drawn self-spacing collars. Coil end sheets shall be galvanized. All coils shall be factory leak checked under pressure. Dual circuit units shall utilize interlaced evaporator coils. B. Evaporator coil section shall be equipped with a double sloped 304 stainless steel drain pan with minimum 3/4” IPS condensate drain connections. Condensate shall be removable from either side of the unit. Drain pan shall extend to the entire length and width of the evaporator coil. Evaporator section air path shall be as shown on project drawings. 2.5 Water-Cooled Condensing Section A. The water / glycol condenser coil shall be co-axial counter-flow refrigerant type. The condenser(s) shall be selected to maintain low refrigerant operating pressure, while using a minimum quantity of water / glycol. Maximum working pressures shall not exceed 450 psig water side, 650 psig refrigerant side. B. Water connections for inlet and outlet shall be made through a side of the unit corner post. There shall be a single water inlet and a single water outlet. Water connections shall be FPT type. 2.6 Blower / Motor Assembly The evaporator centrifugal blower assembly shall be belt driven with double width, double inlet housing and forward-curved blades mounted on a solid keyed shaft. The hub shall be precision machined and incorporate a keyway and a locking screw.
Compressor Acoustic Cover - Each compressor shall be provided with a removable compressor cover using 1.2-2# density acoustical fiberglass surrounded by a tough, durable, weather-proof, flame resistant covering. Compressor Crankcase Heater - Each compressor shall be provided with a wraparound electrical cable resistance heater used to prevent migration and condensation of liquid refrigerant to the compressor crankcase while system is off. 2.4 Evaporator Coil Section A. The direct expansion evaporator coil shall be configured for draw-thru airflow design for uniform air distribution across the coil face. It shall be made with heavy wall seamless copper tubes mechanically expanded into tempered aluminum fins with drawn self-spacing collars. Coil end sheets shall be galvanized. All coils shall be factory leak checked under pressure. Dual circuit units shall utilize interlaced evaporator coils. B. Evaporator coil section shall be equipped with a double sloped 304 stainless steel drain pan with minimum 3/4” IPS condensate drain connections. Condensate shall be removable from either side of the unit. Drain pan shall extend to the entire length and width of the evaporator coil. Evaporator section air path shall be as shown on project drawings. 2.5 Water-Cooled Condensing Section A. The water / glycol condenser coil shall be co-axial counter-flow refrigerant type. The condenser(s) shall be selected to maintain low refrigerant operating pressure, while using a minimum quantity of water / glycol. Maximum working pressures shall not exceed 450 psig water side, 650 psig refrigerant side. B. Water connections for inlet and outlet shall be made through a side of the unit corner post. There shall be a single water inlet and a single water outlet. Water connections shall be FPT type. 2.6 Blower / Motor Assembly The evaporator centrifugal blower assembly shall be belt driven with double width, double inlet housing and forward-curved blades mounted on a solid keyed shaft. The hub shall be precision machined and incorporate a keyway and a locking screw.
Classic-Engineering-Guide-Spec_Water-Cooled_0618.docx