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INSTALLATION INSTRUCTIONS
□ Clean the inlet water filter by closing the cold and hot water inlet
isolation (shut-off) valves. Put a bucket under the filter at the
bottom of the water heater to catch any water that is contained
inside the unit. Unscrew the water filter. Rinse the filter to re
move any debris. Install the filter and open the isolation valves.
□ Check for proper water pressure to the water heater. Minimum
water pressure is 50 psi. Giant recommends 60-80 psi for
CAUTION
maximum performance.
Installation of Gas Supply
WARNING
1) If you are not knowledgeable or qualified to install gas lines
DANGER
or connections, then contact a licensed professional to in-
stall the gas supply.
2) Turn off 120 V power supply.
AVERTISSEMENT
3) Turn off the gas.
4) Gas is flammable. Do not smoke or provide other ignition
sources while working with gas.
ATTENTION
5) Do not turn on the water heater or gas until all fumes are
gone.
General Instructions
MUST DO
• A manual gas control valve must be placed in the gas supply
line to the water heater. A union can be used on the connection
above the shut-off valve for the future servicing or disconnection
of the unit.
• Check the type of gas and the gas inlet pressure before connect-
ing the water heater. If the water heater is not of the gas type that
the building is supplied with, DO NOT connect the water heater.
Contact the dealer for the proper unit to match the gas type.
• Check the gas supply pressure immediately upstream at a loca-
tion provided by the gas company. Supplied gas pressure must
be within the limits shown in the Specifications section with all
gas appliances operating.
• Before placing the appliance in operation all joints including the
heater must be checked for gas tightness by means of leak de-
tector solution, soap, and water, or an equivalent non-flammable
solution, as applicable. (Since some leak test solutions, includ-
ing soap and water, may cause corrosion or stress cracking, the
piping shall be rinsed with water after testing, unless it has been
determined that the leak-test solution is non-corrosive.)
• Use approved connectors to connect the unit to the gas line.
Purge the gas line of any debris before connection to the water
heater.
• Any compound used on the threaded joint of the gas piping shall
be a type which resists the action of liquefied petroleum gas
(propane / LPG).
• The gas supply line shall be gas tight, sized, and so installed
as to provide a supply of gas sufficient to meet the maximum
demand of the heater and all other gas consuming appliances at
the location without loss of pressure.
INFORMATION
• Refer to an approved pipe sizing chart, if in doubt about the size
of the gas line.
Size the gas pipe
The gas supply must be capable of handling the entire gas load at
the location. Gas line sizing is based on gas type; the pressure drop
in the system, the gas pressure supplied, and gas line type. For
gas pipe sizing in the United States, refer to the National Fuel Gas
Code, NFPA 54. The below information is provided as an exam-
ple. The appropriate table from the applica ble code must be used.
1) For some tables, you will need to determine the cubic feet per
hour of gas required by dividing the gas input by the heating
value of the gas (available from the local gas company). The
gas input needs to include all gas products at the lo cation and
the maximum BTU usage at full load when all gas products are
in use.
2) Use the table for your gas type and pipe type to find the pipe
size required. The pipe size must be able to provide the re-
quired cubic feet per hour of gas or the required BTU/hour.
Cubic Feet
Gas Input of all gas products (BTU / HR)
per Hour =
Heating Value of Gas (BTU / FT
(CFH)
Example:
The heating value of natural gas for your location is 1,000 BTU/FT
The gas input of the UGTC-199N is 199,000 BTU/hr. Additional ap-
pliances at the location require 65,000 BTU/hr. Therefore the cubic
feet per hour = (199,000 + 65,000) / 1,000 = 264 FT
length is ten (10) feet (3.0 m), then the 3/4 inch (1.9 cm) pipe size
is capable of supplying 264 FT
Table 20
Pipe Sizing Table - Natural Gas
Schedule 40 Metallic Pipe
Inlet Pressure: less than 2 psi (55 inches W.C.)
Pressure Drop: 0.3 inches W.C.
Specific Gravity: 0.60
Length
3/4
10
273
20
188
30
151
40
129
50
114
60
104
70
95
80
89
90
83
100
79
31 31
)
3
/hr. If the pipe
3
/hr of natural gas.
3
cubic feet per hour
Pipe Size (inches)
1
1 1/4
514
1,060
353
726
284
583
243
499
215
442
195
400
179
368
167
343
157
322
148
304
.
3
1 1/2
1,580
1,090
873
747
662
600
552
514
482
455
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