![background image](http://html.mh-extra.com/html/daikin/ahri-210/ahri-210_installation-instructions-manual_501145011.webp)
11
INLET GAS PRESSURE
NATURAL
Min. 5.0” W.C., Max. 10.0” W.C.
PROPANE Min. 11.0” W.C., Max. 14.0” W.C.
inlet gas pressure must not exceed maximum value shown in
table above.
The minimum supply pressure should not vary from that
shown in the table above because this could prevent the
unit from having dependable ignition. In addition, gas input
to the burners must not exceed the rated input shown
on the rating plate. Overfiring of the unit could result in
premature heat exchanger failure.
Piping
IMPORTANT NOTE: To avoid possible unsatisfactory
operation or equipment damage due to under
firing of equipment, do not undersize the natural/
propane gas piping from the meter/tank to the unit.
When sizing a trunk line, include all appliances on
that line that could be operated simultaneously.
The gas line installation must comply with local codes, or
in the absence of local codes, with the latest edition of the
National Fuel Gas Code NFPA 54 / ANSI Z223.1.
Natural Gas Connection
1/2
3/4
1
1 1/4
1 1 /2
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
Pressure= .50 PSIG or less and Pressure Drop of 0.3" W.C.
(Based on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
Length of
Pipe in Feet
Heating Value of Gas (BTU/Cubic Foot
CFH =
BTUH Furnace Input
Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
1. Use black iron pipe and fittings for the supply piping.
The use of a flex connector and/or copper piping is
permitted as long as it is in agreement with local
codes.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4.
Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
5. Use two pipe wrenches when making connection to
the gas valve to keep it from turning.
6. Install a manual shut-off valve in a convenient location
(within six feet of unit) between the meter and the unit.
7. Tighten all joints securely.
8.
The unit must be connected to the building piping by
one of the following methods:
•
Rigid metallic pipe and fittings
•
Semirigid metallic tubing and metallic fittings
(Aluminum alloy tubing must not be used in
exterior locations).
• Listed gas appliance connectors used in
accordance with the terms of their listing
that are completely in the same room as the
equipment. Always use a new listed connector.
•
In the prior two methods above the connector
or tubing must be protected from physical
and thermal damage. Aluminum alloy tubing
and connectors must be coated to protect
against external corrosion when in contact with
masonry, plaster or insulation or are subject to
repeated wettings by liquids (water - not rain
water, detergents or sewage).
BURNER
DOOR
DRIP
LEG
MANUAL
SHUT-OFF
GROUND JOINT
UNION
TBD
Proper piping practice
NOTE: The unit gas supply entrance is factory
sealed with plugs. Keep plugs in place until
gas supply is ready to be installed. Once ready,
replace the plugs with the supplied grommets and
install gas supply line.
Summary of Contents for AHRI 210
Page 31: ...31 ...
Page 32: ...32 ...
Page 33: ...33 THIS PAGE LEFT INTENTIONALLY BLANK ...
Page 34: ...34 THIS PAGE LEFT INTENTIONALLY BLANK ...