Assessments - 4, GPA: 4.3
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Connecting a Loop Pump Kit Closed Loop System All piping external to the unit is the responsibility of the installer. The water pipe installation must be done in accordance with local codes. If no local code applies, national codes should be followed. It is the contractor’s responsibility to know and adhere to all applicable codes. Water inlet and outlet to the unit’s water- to-refrigerant heat exchanger are clearly marked on the submittal drawings found on pages 7 through 9. The supply and return piping must be installed correctly to the unit to ensure the safety devices will work properly. Units that are not piped accordingly will not obtain the manufacturers warranty. A pump module (Figure 5) and hose kit (Figure 6) are typically used to connect the unit to closed loop piping in domestic applications. FROM UNIT’S TO UNIT’S W.O. W.I. Figure 5 Pump module BRONZE OR CAST IRON PUMP PURGING CAP (2) SHUT-OFF 3-WAY VALVE (2) 1" MPT x BARB FITTINGS, 1" MPT x BARB ELBOWS with PRESSURE TEMPERATURE PORTS, AND 10’ OF RUBBER HOSE with 4 HOSE CLAMPS. Figure 6: Hose kit WSHP-SVX02A-EN Installation Figure 7: Loop pump kit installation Supply/Return Pipe Connections to the Loop Pump Kit (1) Connect the supply and return hoses to the water-inlet (from supply) and water-outlet (to return) of the unit. The rubber gaskets for the water-in and water-out connections are located in the control box. These gaskets require field installation prior to connecting the water piping to the unit. (2) Hand tighten the 1" FPT brass swivel quick connections to the 1" MPT adapter with P/T ports. Using a wrench, tighten the adapter approximately 1/2 additional turn. Care must be taken to avoid overtightening as to not dislodge the snap ring. (3) The water lines should be routed not to interfere with access to the unit. The use of a short length of high pressure hose with the swivel fitting may simplify the connections and prevent vibration. Pressure/Temperature (P/T) ports are required for troubleshooting the hydronic side of the unit. Extreme care should be taken by the installing contractor to prevent dirt or other foreign matter from entering the pipes or piping components during construction. Pipes should be capped until they are in place and ready to be connected to the system. (4) Install the Trane loop pump module. See installation manual WSHPCIN- 5 or 72-9006-03 for instructions. If the unit does not contain a Trane loop pump module, two ball valves must be installed between the unit and the loop’s water pump to isolate the unit from the system’s water loop during maintenance and emergency situations. See Figure 7. If the unit s contain a Trane loop pump module, shut-off valves are supplied by the manufacturer within the pump module assembly. (5) Connect the unit’s water-in and water- out hose to the loop pump module. (6) The pumps connect to the load side 230 volt compressor contactor, and require a field installed 6 amp in-line fuse and holder. (7) Insulate all indoor piping. Equipment is designed to operate with fluid temperature of 25.F to 120.F WSHP-SVX02A-EN Installation Water Heater Hook-up (option) Instructions for connection from the desuperheater (option) water-in/out to the domestic hot water heater may be found in WSHPC-IN-4 or 72-9006-02. This water heater kit (Figure 8) ships in all units with the desuperheater option. The kit is zip tied to the compressor base; and consists of piping connections and shut-off valve. For units containing the desuperheater option, the desuperheater pump fuse is located within a container inside of the control box. The fuse is not factory installed. Note: If the fuse is installed, and the unit is started without water in the system, pump damage may occur. Using Antifreeze In areas of the country where entering water temperatures drop below 45°F or where piping is being run through areas subject to freezing, the loop must be freeze protected by using an approved antifreeze solution to prevent the earth loop water from freezing inside the heat exchanger. Methanol and glycols are the most commonly used antifreeze solutions. Consult your geothermal unit supplier for locally approved solutions in your area. Propylene glycol is not recommended in installations where the water temperature are expected to fall below 30°F. At extreme temperatures, the viscosity increases to the point where normal loop circulating pumps may not maintain proper flow. If propylene glycol is the only locally approved solution for anti-freeze, good engineering practices should be used to achieve the desired flow. Calculate the approximate volume of water in the system by using the requirements detailed in Table 2. Add three gallons to this total to allow for the water contained in the hose kit and geothermal unit. Figure 8: Water heater kit Table 2: Antifreeze requirements based on volume Type of Antifreeze Minimum Temperature for Freeze Protection 10°F 15°F 20°F 25°F 30°F Methanol 25% 21% 16% 10% 3% Propylene Glycol --...
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