Watts IS-TWH-UTS Installation Instructions

Tankless Water Heater
Installation Instructions
STOP!
Before connecting any components, be sure to read all
of the tankless water heater manufacturer's installation
instructions. Failure to follow instructions below can re-
sult in serious injury, death and/or property damage.
1. Identify all components and
orientations before beginning
installation
1. HOT WATER SERVICE VALVE (Fig.1)
Identified by a RED ring on the upper
union connection and by the red
insulator handle.
2. COLD WATER SERVICE VALVE (Fig.2)
Identified by a blue ring on the upper
union connection and by the blue
insulator handle.
3. CHECK MODULE
Check element is integral to cold
water 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 local
codes govern the installation
of pressure relief valves.
2. Before attaching any components
to the tankless water heater,
attach PRESSURE RELIEF VALVE
to HOT WATER ISOLATION
VALVE (Figure 4)
CAUTION: Do not over tighten relief
valve. Do not tighten more than 2
turns past hand tight.
a. Apply thread sealant to the exposed
threads of the pressure relief valve.
b. Thread the pressure relief valve into
3
the ⁄ " port on the side of the hot
4
water valve and hand tighten. Using
a wrench, tighten the pressure relief
valve until the discharge on the pres-
sure relief valve is positioned down-
ward on the isolation valve, as shown
in Figure 4.
Hot Service Valve Purge Port Flow Data
3
⁄
Attach this end to
tankless water heater
Fig.1
3. Install COLD WATER SERVICE VALVE onto cold water
inlet of tankless water heater
a. Locate the cold water threaded inlet on the tankless water
heater and apply thread sealant to the threads.
b. Slightly loosen the union nut on the top of the cold water
Attach this end to
tankless water heater
valve (i.e. the end with the blue insulator ring) so that the
Fig.2 union 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, position
the cold water valve with the purge port pointing forward,
towards the front of the water heater, and hand tighten the
union nut.
Fig.3
d. Verify that the blue insulator seats itself between the union
tailpiece and the union nut. Tighten the union nut with a
wrench, making sure that the valve does not rotate out of
position.
4. Install HOT WATER SERVICE VALVE onto hot water
outlet of tankless water heater
WARNING: There should not be a shutoff located between
the tankless water heater and pressure relief valve. (see
direction arrow in Fig. 5)
Fig.4
a. Locate the hot water threaded outlet on the tankless water
heater 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 the
hot valve with the purge port and pressure relief valve point-
ing forward, towards the front of the water heater, and hand
tighten the union nut. Verify that the insulator seats itself
between the union tailpiece and the union nut. Tighten the
Drain Line
union nut with a wrench, making sure that the valve does not
rotate out of position.
ATTENTION INSTALLER: After installation, please leave this
Instruction Sheet for occupant's information.
IMPORTANT: Inquire with governing authorities for local
installation requirements.
" Service Valve Set
4
IS-TWH-UT_UTS