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INSTALLATION INSTRUCTIONS
Installer Qualifications
A licensed professional must install, inspect, and leak test the
appliance before use. The warranty will be voided due to improper
installation.
The installer should have skills such as:
• gas sizing
• connecting gas lines, water lines, valves, electricity
• knowledge of applicable national, provincial, and local codes
• installing venting through a wall or roof
If you lack these skills, contact a licensed professional.
Type of installation
• For installation in residential and commercial applications.
• You must follow the installation instructions for adequate com-
bustion air intake and exhaust.
General Instructions
DO NOT
• Do not install the UGTC-152 or the UGTC-199 outdoors.
• Do not install the appliance in an area where water leakage of
the unit or connections will result in damage to the area adjacent
to the appliance or to lower floors of the structure. When such
locations cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the appliance.
The pan must not restrict combustion air flow.
• Do not obstruct the flow of combustion and ventilation air. Com-
bustion air shall not be supplied from occupied spaces.
• Do not use this appliance in an application such as a pool or spa
heater that uses chemically treated water. (This appliance is suit-
able for filling large or whirlpool spa tubs with potable water.)
• Do not use substitute parts that are not authorized for this ap-
pliance.
MUST DO
• The installation must conform with local codes or, in the ab-
sence of local codes, with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or the Natural Gas and Propane Installation
Code, CSA B149.1.
• When installed, the appliance must be electrically grounded in
accordance with local codes or, in the absence of local codes,
with the National Electrical Code, ANSI/NFPA 70, or the Canadian
Electrical Code, CSA C22.1.
• The appliance and its appliance main gas valve must be discon-
nected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psi (3.5
kPa) (13.84 in W.C.).
• The appliance must be isolated from the gas supply piping sys-
tem by closing its individual manual shut-off valve during any
pressure testing of the gas supply piping system at test pres-
sures equal to or less than 1/2 psi (3.5 kPa) (13.84 in W.C.).
• You must follow the installation instructions for adequate com-
bustion air intake and exhaust.
INFORMATION
• If a water heater is installed in a closed water supply system,
such as one having a backflow preventer in the cold water sup-
ply line, means shall be provided to control thermal expansion.
Contact the water supplier or local plumbing inspector on how
to control thermal expansion.
• Should overheating occur or the gas supply fail to shut off, turn
off the manual gas control valve to the appliance.
• Keep the air intake location free of chemicals such as chlorine
or bleach that produce fumes. These fumes can damage compo-
nents and reduce the life of your appliance.
Table 1
Prepare for installation
Parts included
• Tankless water heater
Tools needed
• Pipe wrenches (2)
• Adjustable pliers
• Screwdrivers (2)
• Wire cutters
Tools that might be needed
• Hammer drill with
concrete bits
• Saw
• Threading machine with
heads and oiler
Materials needed
• Soap solution
• Approved venting
Materials that may be needed
• Heat tape
• Pipe insulation
• Electrical wire and conduit
per local code
• Concrete wall anchors
• Optional pipe cover
• Optional temperature
controller
4
• MC-91-2 temperature controller
(integrated into the front panel)
• Gloves
• Safety glasses
• Level
• Manometer
• Core drill with diamond head
• Torch set
• Copper tubing cutter
• Steel pipe cutter
• Teflon tape (recommended) or
pipe compound
• 5/8" ID PVC flexible tubing
• Two (2) conductor 22 AWG
wires for controller
• Single gang electrical box
• Wire nuts
• Unions and drain valves
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