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INSTALLATION INSTRUCTIONS
Vent Components and Assigned Equivalent Lengths:
The following fittings and accessories (by others) are certified for
use with the above mentioned condensing products:
• Vent screens are not ULC S636 Certified.
• Friction fit vent screens inside termination fitting are to avoid
debris and/or small animals from entering vent.
• Primer shall be used when installing System 636 and other PVC/
CPVC products at temperatures below 32
• Primer is required in some jurisdictions regardless of tempera-
ture, verify with your local authority having jurisdiction.
• Use only System 636 cements and primers with System 636
components; substituting other cements and primers will void
IPEX's certification and warranty; (see OEM's literature).
• For Schedule 40 PVC/CPVC, any glue and primer approved by
your local authority having jurisdiction may be substituted.
Installation of Plumbing
Pressure-Relief Valve Requirements
Install the pressure-relief valve according to these instructions.
An approved pressure-relief valve is required by the American Na-
tional Standard (ANSI Z21.10.3) for all water heating systems and
shall be accessible for servicing.
DO NOT
• Do not plug the relief valve or install any reducing fittings or
other restrictions in the relief line. The relief line should allow for
complete drainage of the valve and the line.
• Do not place any other type of valve or shut off device between
the relief valve and the water heater.
MUST DO
• The relief valve must comply with the standard for Relief Valves
and Automatic Gas Shutoff Devices for Hot Water Supply Systems
ANSI Z21.22 and/or the standard Temperature, Pressure, Tem-
perature and Pressure-Relief Valves and Vacuum-Relief Valves,
CAN1 4.4.
• The relief valve must be rated up to 150 psi and to at least the
maximum BTU/hr of the appliance.
• The discharge from the pressure-relief valve should be piped to
the ground or into a drain system to prevent exposure or possi-
ble burn hazards to humans or other plant or animal life. Follow
local codes. Water discharged from the relief valve could cause
severe burns instantly, scalds, or death.
• The pressure relief valve must be manually operated once a year
to check for correct operation.
• The relief valve should be added to the hot water outlet line and
near the hot water outlet according to the manufacturer's in-
structions. DO NOT place any other type valve or shut off device
between the relief valve and the water heater.
INFORMATION
• If a relief valve discharges periodically, this may be due to ther-
mal expansion in a closed water supply system. Contact the wa-
ter supplier or local plumbing inspector on how to correct this
situation. Do not plug the relief valve.
Isolation Valves
Giant strongly recommends the installation of isolation valves on
the cold and hot water lines because they provide the ability to
isolate the water heater from the structure's plumbing and allow
F (0
C).
o
o
quick access to flush the heat exchanger. Flushing the heat ex-
changer regularly is required as part of the proper maintenance for
this water heater.
Piping Requirements
A manual water control valve must be placed in the water inlet
connection to the water heater before it is connected to the water
line. Unions may be used on both the hot and cold water lines for
future servicing and disconnection of the unit.
DO NOT
MUST DO
Connect Water Heater to Water Supply
Water connections to the tankless water heater should follow all
provincial and local plumbing codes.
If this is a standard installation, refer to the Piping Diagram for
Basic Installation.
1) Plumb water supply to the tankless water heater on the 3/4"
2) Plumb the building hot water supply to the 3/4" MSPT connec-
If a pipe cover will be installed, make sure water lines to the water
heater fit.
Checklist for Plumbing
29 29
• The American National Standard (ANSI Z21.10.3) does not re-
quire a combination temperature and pressure-relief valve for
this appliance. However, local codes may require a combination
temperature and pressure-relief valve.
• Do not introduce toxic chemicals such as those used for boiler
water treatment to the potable water used for space heating.
• The piping (including soldering materials) and components con-
nected to this appliance must be approved for use in potable
water systems.
• Purge the water line to remove all debris and air. Debris will
damage the water heater.
• If the appliance will be used as a potable water source, it must
not be connected to a system that was previously used with a
non-potable water heating appliance.
• Ensure that the water filter on the water heater is clean and in-
stalled.
MNPT connection at the bottom of the unit marked "Water
Inlet", which is the cold water supply.
tion marked "Water Outlet", which is the hot water supply.
□ Purge the water line of all debris and air by closing the hot iso-
lation valve and opening the cold isolation valve and its drain.
Debris will damage the water heater. Use a bucket or hose, if
necessary.
□ Ensure that hot and cold water lines are not crossed to the unit
and are leak-free.
□ Ensure that a pressure-relief valve is installed with a rating that
exceeds the BTU input of the water heater model. Refer to the
rating plate on the side of the water heater for BTU input.
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