Watts IS-TWH-UTS User manual

IS-TWH-UT_UTS
Tankless Water Heater 3⁄4" Service Valve Set
Installation Instructions
ATTENTION INSTALLER: After installation, please leave this
Instruction Sheet for occupant’s information.
IMPORTANT: Inquire with governing authorities for local
installation requirements.
Fig.4
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)
Identied by a RED ring on the upper
union connection and by the red
insulator handle.
2. COLD WATER SERVICE VALVE (Fig.2)
Identied 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)
Identied 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
the 3⁄4" port on the side of the hot
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.
Drain Line
Attach this end to
tankless water heater
Attach this end to
tankless water heater
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
valve (i.e. the end with the blue insulator ring) so that the
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.
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)
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
union nut with a wrench, making sure that the valve does not
rotate out of position.
Fig.1
Fig.2
Fig.3
Hot Service Valve Purge Port Flow Data

5. Connect water line and pressure relief drain line
a. Attach the HOT water supply line
to the ¾" threaded connection on
the HOT WATER VALVE using
thread sealant on the threads
of the water fitting. On US (union
sweat) models, detach the copper
tailpiece from the union assembly
and sweat to the hot water supply
line. Be sure to remove the
O-ring from the tailpiece before
seating. Allow tailpiece to cool before
reassembly to avoid damaging O-ring.
b. Attach the COLD water supply line to the ¾" threaded con-
nection on the COLD WATER VALVE using thread sealant on
the threads of the water fitting. On US (union sweat) models,
detach the copper tailpiece from the union assembly and
sweat to the cold water supply line. Be sure to remove the
O-ring from the tailpiece before seating. Allow tailpiece to
cool before reassembly to avoid damaging the O-ring.
c. Attach the drain line to the pressure relief valve and run line
per local code requirements.
6. Start-up & Normal Operation
a. Before turning on the supply water to the heater, make sure
that the main valve handles on both the hot & cold valves are
closed (Tee handle perpendicular to the main valve bodies).
Also ensure that the purge port valve caps are tightened down
and that the valves are in the closed position (Tee handle per-
pendicular to the purge port valve body). NEVER RELY ON
THE PURGE CAP TO STOP THE WATER FLOW.
b. For water heater start-up, refer to the water heater owners’
manual.
c. During normal operation, the main water valves are open
when the main valve handle is parallel with the main valve
body and closed when the main valve handle is perpendicular
to the main valve body.
d. For the purge port valves, the purge port valve is open when
the slot is parallel with the purge port valve body and closed
when the slot is perpendicular to the purge port valve.
7. Inspection and Maintenance
a. See tag attached to pressure relief valve for details.
WARNING: Hot water may be present in the system, use
extreme caution when servicing tankless water heater.
Hot water can cause personal injury, death and/or
property damage.
8. Drain/Flush Operation
Note: The following are suggested instructions for the use of
the service valves during draining and flushing of the tank-
less water heater. Please refer to the water heater owner’s
manual for specific instructions.
a. Disconnect the power supply to the water heater.
b.
Close the main water valve handles on the cold water valve
(blue handle) and the hot water valve (red handle) by rotat-
ing each until they are perpendicular with the respective valve
body. This shuts off the incoming cold water to the water
heater and isolates the water heater from the hot water piping
within the rest of the home.
c. The purge valve on the cold water valve (blue) is used as the
flushing inlet and the purge valve on the hot water valve (red)
is used for the flushing outlet or drain. Ensure that the purge
port is closed (Tee handle perpendicular to the purge port
valve body) before removing the purge port valve cap.
d. Slowly open the drain caps on each purge port valve. Ensure
that the rubber washer stays in the cap.
e. Continue with the manufacturer’s recommendations for
attachment of the lines and for specific draining and flush-
ing instructions. To open the purge port valves, the slots are
rotated so that they are parallel to the purge port valve body.
f. When flushing is complete and before the lines are removed,
ensure that the purge port valves are closed. Remove the
lines and reinstall the purge port valve caps, ensuring that the
rubber washer is in the cap, and tighten.
Fig.5
Drain Line
Attach this end
to tankless
water heater
IS-TWH-UT_UTS 0849 EDP# 1915990 © Watts, 2008
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER
WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special
or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting
from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no
control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above
limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to
determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.