Gas Supply/Piping - Takagi T - M1 Installation And Operating Instructions Manual

Gas Supply and Gas Piping Sizing
This unit needs a manual gas control valve
(System Shutoff Valve) that must be placed on
the unit before it is connected to the gas line.
Check the gas inlet pressure and the type of
gas matches the rating plate located on your
water heater. Insufficient gas pressure and
volume will cause your MOBIUS Water Heater
to be inefficient in performance and not work
properly. Size gas piping system correctly
following ANSI233.1/NFPA 54, or by local
code.
When measuring the inlet supply pressure, the
water heater and all other gas appliances
sharing the water heater gas supply line must
be firing at maximum capacity. Maximum gas
pressures must not exceed this value. Low gas
pressure could be caused by an undersized
gas pipe, this will cause the MOBIUS water
heater's performance to diminish and would
not be able to reach maximum performance.
When connections are completed, check for
gas leaks by applying soapy water to all gas
fittings and connections. Soap bubbles are a
sign of gas leaks. This appliance and its
individual shut-off valve must be isolated from
the gas supply piping system by unplugging
Pipe Size
Length 10' 20'
½" 174 119
¾" 363 249
1" 684 470
1 ¼" 1404 965
1 ½" 2103 1445 1161
2" 4050 2784 2235 1913 1696 1536 1413 1315 1234 1165 1033
Propane Supply Piping (Based on 11" WC supply pressure)
Pipe Size
Length 10' 20'
½" 275 189
¾" 567 393
1" 1071 732
1 ¼" 2205 1496 1212 1039
1 ½" 3307 2299 1858 1559 1417 1275 1181 1086 1023
2" 6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1496 1260
Natural Gas Supply Piping
Based on 0.60 specific gravity for natural gas at .5" WC pressure drop
DOE standard is 1100 BTU per cubic ft. of natural gas
30' 40' 50'
96 82 73
200 171 152
377 323 286
775 663 588
993 880
30' 40' 50'
152 129 114
315 267 237
590 504 448
913
the unit and turning off the main gas valve during
any pressure testing of the gas supply piping
system at test pressures equal to or less than ½
Psi. The appliance and its gas connections must
be leak tested before placing the unit in
operation. Always use approved connectors to
connect the unit to the gas line. Always purge the
gas line of any debris before connecting to the
heater gas inlet.
WARNING: Conversion of this unit from natural
gas to propane or propane to natural gas cannot
be done in the field. Contact your local retailer or
distributor to get the correct unit for your gas type.
Conversion
manufacture will void any and all warranty.
Recommend Gas pipe size for
MOBIUS Water Heater(Example for NG)
Distance from Gas Meter
NOTE: These Tables below are for Natural Gas
(0.60 Specific Gravity) and based on Pressure
Drop of 0.5 Inch water columns. This table is for
Gas piping supply straight to the water heater
without
Cubic Feet of Natural Gas
60' 70' 80'
66 61 56
138 127 118
259 239 222
532 490 456
798 734 683
kBTU of Propane
60' 70' 80'
103 96 89
217 196 185
409 378 346
834 771 724
10
done by anyone
Pipe Size (inches)
0' - 20'
20' - 60'
60' – 100'
any tab to other
90' 100' 125'
53 50 44
111 104 93
208 197 174
428 404 358
641 605 536
90' 100' 125'
83 78 69
173 162 146
322 307 275
677 630 567
976 866
other the
3/4"
1"
1-1/4"
gas appliance.
150' 200'
40 34
84 72
158 135
324 278
486 416
936 801
150' 200'
63 55
132 112
252 213
511 440
787 675