Carrier GT-PX Split Series Installation, Operation & Maintenance Instructions Manual

25R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 AR e v. : 5 J u n e , 2 0 0 8C a r r i e r : Tu r n t o t h e E x p e r t sGeneral InformationThe HWG Module consists of an all-copper, vented double-wall heat exchanger and a water-cooled water circulatingpump. The pump is controlled by the use of one or morelimit switches. Power for the pump is provided from eitherthe compressor contactor of the outdoor section of the heatpump, or it may come from a remote power source if theappropriate controls are used.Location/MountingThe HWG module should be mounted as close to the heatpump outdoor section as possible, in order to minimizethe length of refrigerant run. Indoor mounting is preferred,where practical, to reduce the likelihood of freezing ambienttemperature. It is recommended that the HWG module bemounted above the system compressor in order to promoteproper oil movement and drain-down. This means that theHWG module can be wall mounted in any orientationexcept for stubs up. Mounting should be accomplishedby fastening the HWG module cabinet to the wall or otherselected vertical surface. A flange is provided at the top rearof the unit. Any fastener suitable for supporting a 12 pound[5.4] vertical load is acceptable.SPECIAL NOTE: The selected mounting location andorientation must allow the circulator pump to be positionedwith the motor shaft horizontal. DO NOT install the HeatRecovery Unit flat on its back.Refrigerant Line InstallationBefore starting the installation into the refrigerant circuit,inspect and note the condition and performance of theheat pump. Disconnect power to the heat pump outdoorunit. Any system deficiencies must be corrected prior toinstalling the HWG module. Addition of the unit will notcorrect system problems. Record the suction and dischargepressures and compressor amperage draw. These willbe used for comparison with system operation after therefrigerant line installation is complete and before the waterline installation is performed. Install the Add-On HWG kitusing the installation instructions below. Locate the HWGas close to the water heater as possible. Unbraze the hotgas u-bend as shown in Figure 19. Take care to avoidoverheating components. Install the dual 1/2” lineset to theHWG. Maximum length should be 30 feet one way. Evacuatethe lineset to 500 microns through the hot gas valves inthe outdoor unit. Open the valves up fully (CCW looking upfrom cap end). Check the lineset for leaks. Pinch the bypasstubing as shown in Figure 19 being careful not to damagethe tubing. Verify that lineset tubing is completely insulatedwith a minimum 1/2” thick closed cell and painted to preventdeterioration of the insulation due to ultra violet light andweather. Make the connections with high temperature solderor brazing rod. The recommended line size is dependent onthe one way distance between the Heat Recovery Unit andthe compressor; and the size of the system. Use the Table 7as a guideline.Capacity Line Set Size1/2” OD 5/8” OD 3/4” OD2 Ton Up to 16 ft.[4.9m]Up to 30 ft.[9.1m]N/A3 Ton Up to 9 ft.[2.7m]Up to 25 ft.[7.6m]Up to 30 ft.[9.1m]4 Ton Up to 5 ft.[1.5m]Up to 13 ft.[4.0m]Up to 30 ft.[9.1]5 Ton N/A Up to 9 ft.[2.7m]Up to 25 ft.[7.6m]As a guideline add 1.0 oz. of R-22 for the heat exchangerplus 1.0 oz. for each 10 ft of 1/2” OD refrigerant line, if theweighed charge method is used (28g for the heat exchangerplus 9g per meter of 1/2” OD refrigerant line).Hot Water Generator Module Refrigeration Installation -Outdoor Compressor Section OnlyTable 7: HWG Module Lineset SizingUnbraze u-tubeHot water generatorservice valve assembly(inside cabinet)Hot Gas toReversing ValveHot Gas fromCompressorField connection ofHot Water linesetPinch off here after evacuatinglineset and opening valvesOpen Valves CW Closevalves CCW as looking upfrom underneathFigure 19: HWG Connection Details3. Turn the heat pump and heat pump power supply “OFF”and CONNECT POWER TO THE HWG PUMP as shownin the unit wiring diagram. Connect the pump power leadas instructed on the tag attached to the pump wiring.4. The HWG pump should not run if the compressor isnot running.5. The temperature difference between the water enteringand leaving the HWG coil should be approximately 5-10°F[3-6°C].6. Allow the unit to operate for 20 to 30 minutes to insurethat it is functioning properly.