Watts IS-TWH-UTS Installation Instructions Manual

Watts IS-TWH-UTS Installation Instructions Manual Manual pdf 1 page image

IS-TWH-UT_UTSTankless Water Heater 3⁄4" Service Valve SetInstallation InstructionsATTENTION INSTALLER: After installation, please leave thisInstruction Sheet for occupant’s information.IMPORTANT: Inquire with governing authorities for localinstallation requirements.Fig.4STOP!Before connecting any components, be sure to read allof the tankless water heater manufacturer’s installationinstructions. Failure to follow instructions below can re-sult in serious injury, death and/or property damage.1. Identify all components andorientations before beginninginstallation1. HOT WATER SERVICE VALVE (Fig.1)Identified by a RED ring on the upperunion connection and by the redinsulator handle.2. COLD WATER SERVICE VALVE (Fig.2)Identified by a blue ring on the upperunion connection and by the blueinsulator handle.3. CHECK MODULECheck element is integral to coldwater service valve in TWH-QC-HC,TWH-UT-HC-RV and TWH-QC-HC-RV kits only.4. PRESSURE RELIEF VALVE (Fig.3)Identified by a silver test lever.Note: ANSI Z21.22 and localcodes govern the installationof pressure relief valves.2. Before attaching any componentsto the tankless water heater,attach PRESSURE RELIEF VALVEto HOT WATER ISOLATIONVALVE (Figure 4)CAUTION: Do not over tighten reliefvalve. Do not tighten more than 2turns past hand tight.a. Apply thread sealant to the exposedthreads of the pressure relief valve.b. Thread the pressure relief valve intothe 3⁄4 " port on the side of the hotwater valve and hand tighten. Usinga wrench, tighten the pressure reliefvalve until the discharge on the pres-sure relief valve is positioned down-ward on the isolation valve, as shownin Figure 4.Drain LineAttach this end totankless water heaterAttach this end totankless water heater3. Install COLD WATER SERVICE VALVE onto cold waterinlet of tankless water heatera. Locate the cold water threaded inlet on the tankless waterheater and apply thread sealant to the threads.b. Slightly loosen the union nut on the top of the cold watervalve (i.e. the end with the blue insulator ring) so that theunion tailpiece rotates freely.c. Holding the cold water valve beneath the cold water inlet,thread the union tailpiece onto the inlet and hand tighten.Using a wrench, tighten the union tailpiece. Next, positionthe cold water valve with the purge port pointing forward,towards the front of the water heater, and hand tighten theunion nut.d. Verify that the blue insulator seats itself between the uniontailpiece and the union nut. Tighten the union nut with awrench, making sure that the valve does not rotate out ofposition.4. Install HOT WATER SERVICE VALVE onto hot wateroutlet of tankless water heaterWARNING: There should not be a shutoff located betweenthe tankless water heater and pressure relief valve. (seedirection arrow in Fig. 5)a. Locate the hot water threaded outlet on the tankless waterheater and apply thread sealant to the threads.b. Slightly loosen the union nut on the top of the hot water valve(i.e. the end with the red insulator ring) so that the union tail-piece rotates freely.c. Holding the hot water valve beneath the hot water outlet,thread the union tailpiece onto the outlet and hand tighten.Using a wrench, tighten the union tailpiece. Next, position thehot valve with the purge port and pressure relief valve point-ing forward, towards the front of the water heater, and handtighten the union nut. Verify that the insulator seats itselfbetween the union tailpiece and the union nut. Tighten theunion nut with a wrench, making sure that the valve does notrotate out of position.Fig.1Fig.2Fig.3Hot Service Valve Purge Port Flow Data

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