Installation Manual

40
WATER (POTABLE) HEATING AND SPACE HEATING
1. All water piping components connected to the water heater
that are for space heating applications shall be suitable for
use with potable water.
2. Toxic chemicals, such as those used for boiler treatment,
must NEVER be introduced into this system.
3. The water heaters covered in this manual may never be
connected to any existing heating system or component(s)
previously used with non-potable water heating appliance.
4. When the system requires water for space heating that
exceed safe temperatures at domestic water xtures a mixing
valve must be installed, see Mixing Valves on page 14.
5. These water heaters cannot be used in space heating
applications only.
T&P VALVE DISCHARGE PIPE
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
This water heater is provided with a properly rated/sized and
certied combination temperature - pressure (T&P) relief valve
by the manufacturer. See Temperature-Pressure Relief Valve on
page 15 for information on replacement and other requirements.
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
Install a discharge pipe between the T&P valve discharge opening and
a suitable oor drain. Do not connect discharge piping directly to the
drain unless a 6” (15.2 cm) air gap is provided. To prevent bodily injury,
hazard to life, or property damage, the relief valve must be allowed
to discharge water in adequate quantities should circumstances
demand. If the discharge pipe is not connected to a drain or other
suitable means, the water ow may cause property damage.
T&P Valve Discharge Pipe Requirements:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both the
Temperature-Pressure Relief Valve and the discharge pipe.
• Must terminate a maximum of six inches above a oor drain
or external to the building. In cold climates, it is recommended
that the discharge pipe be terminated at an adequate drain
inside the building.
• Shall not have any valve or other obstruction between the
relief valve and the drain.
2. Locate the CCB enclosure.
3. Carefully remove the CCB enclosure cover.
4. Locate pins 1 and 2 on the CCB J17 plug. See Figure 57 on page 63.
5. Connect the two eld supplied control wires to pins 1 and 2 on the
CCB J17 plug.
6. Thread the control wires out of the CCB enclosure with the other
wiring and carefully replace the CCB enclosure cover. Ensure all
wiring is routed through the intended area provided for strain relief.
Ensure no wiring is being pinched.
7. Reinstall the CCB enclosure cover.
8. Route the control wires inside the junction box on the top of the water
heater; see Figure 3 on page 8 to locate the junction box. Use an
available knock-out to route the wires inside the junction box.
9. Install eld supplied control wiring and conduit as required by national
and local codes between the water heater’s junction box and the
external supervisory control. Connect the wiring from the external
control to the control wires inside the junction box using wire nuts
and electrical tape.
10. Connect the control wiring to a set of dry contacts on the external
control. Follow the control manufacturer’s instructions for making
connections.
11. Restore power to the water heater.
12. From the water heaters UIM “Heater Information Screen” select “Use
External Enable” and change to “Yes”. See Figure 3 on page 8 to
locate the UIM.
NOTE: Whenever the external control opens the set of dry contacts
used, water heating operation will be disabled. Whenever the
external control closes the set of dry contacts used, water heating
operation will be enabled. A diagonal line and circle appears over
the thermometer icon on the UIM when water heating operation is
disabled. See the Status Icons descriptions in Table 16 on page 43.
NOTE: Ensure the water heater is protected from freezing temperatures
when water heating operation is disabled. Damage to the water heater
caused by freezing temperatures is not covered under the limited warranty.
WATER LINE CONNECTIONS
The water piping installation must conform to these instructions
and to all local and national code authority having jurisdiction.
Good practice requires that all heavy piping be supported.
Read and observe all requirements in the following sections
before installation of the water piping begins:
1. Mixing Valves on page 14.
2. Dishwashing Machines on page 14.
3. Temperature-Pressure Relief Valve on page 15.
4. Closed Systems and Thermal Expansion on page 14.
5. For multiple water heater installations see Water Piping
Diagrams beginning on page 66.
WATER PIPING DIAGRAMS
This manual provides detailed water piping diagrams for typical methods
of application for the water heaters, see Water Piping Diagrams
beginning 66.
The water heater may be installed by itself, or with a separate storage tank.
When used with a separate storage tank, the circulation may be either by
gravity or by means of a circulating pump. When a circulating pump is
used, it is important to note that the ow rate should be slow so that there
will be a minimum of turbulence inside the water heater storage tank.
Adjust ow by throttling a full port ball valve installed in the circulating line
on the outlet side of the pump. Never throttle ow on the suction side of
a pump. See the Water Piping Diagrams beginning on page 66.
NOTE: In addition to the factory installed Temperature-Pressure Relief Valve
(T&P valve) on the water heater, each remote storage tank that may be installed
and piped to a water heating appliance must also have its own properly sized,
rated and approved Temperature-Pressure Relief Valve installed.
Call the toll free technical support phone number listed on the back cover
of this manual for further assistance in sizing a T&P valve for remote
storage tanks.
THERMOMETERS (NOT SUPPLIED)
Thermometers are installed in the water piping system as a means
of detecting the temperature of the hot water supply at critical
points in the system. Field supplied thermometers should be
obtained and installed. See Water Piping Diagrams on page 66.