Water Connections - Takagi T-H2-DV Installation Manual And Owner's Manual

Gas Sizing Example
T H2 DV/
T H2 OS
199,000BTU
10' Length
5' Length
3/4" Pipe Size
A
1 1/4" Pipe Size
10' Length
5' Length
1" Pipe Size
1 1/4" Pipe Size
Gas Meter
FOR YOUR SAFETY, READ BEFORE OPERATING:
Do not use this water heater if any part has been submersed under water. Immediately call a
licensed professional to inspect the water heater and to replace any damaged parts.
1. All pipes, pipe fittings, valves and other components, including soldering materials, must be
suitable for potable water systems.
2. A manual shut off valve must be installed on the cold water inlet to the water heater between the
main water supply line and the T H2 DV/T H2 OS.
3. In addition, a manual shut off valve is also recommended on the hot water outlet of the unit. If the
T H2 DV/T H2 OS is installed within, or subjected to, a closed loop water system, a thermal
expansion tank must be installed.
4. Before installing the water heater, flush the water line to remove all debris, and after
installation is complete, purge the air from the line. Failure to do so may cause damage to the
heater.
5. There is a wire mesh filter within the cold inlet to trap debris from entering your heater. This will
need to be cleaned periodically to maintain optimum flow.
Do not reverse the hot
outlet and cold inlet
connections to the T H2
DV/T H2 OS Water Heater.
CAUTION
This will not properly active
the water heater.
(Natural Gas)
Dryer
35,000BTU
15' Length
1/2" Pipe Size
B
1" Pipe Size
10' Length
C
1/2" Pipe Size
3/4" Pipe Size
Range
Furnace
65,000BTU
120,000BTU

WATER CONNECTIONS

Based on Energy Content of 1000BTU/Cubic Ft:
Divide each appliance's BTU requirement by 1000BTU to get
the appliances Cubic Ft. requirement.
Takagi into account the distance the appliance is from the gas
meter, look in the above gas chart to properly size the line.
For sections of the gas line supplying gas to more than one
appliance (Ex: Point A to Point B), add up the cubic ft.
10' Length
requirements of the appliances that are being supplied by that
section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the
15' Length
furnace, range, and dryer. Adding up the BTU requirements
and dividing by 1000 yields a cubic ft. requirement of 220
cubic ft. of gas. The farthest appliance is the range, which is 50
ft. away from the meter. Looking at the above chart, and
under the column of 50ft., Section A to B needs to be 1" in
order to supply 220 cubic ft.
Condensate drain port
Water outlet
(HOT)
19
Page
Installation
GAS inlet
Water inlet
(COLD)