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INSTALLATION
GAS CONNECTION
HIGH ELEVATION
The gas connection is a 3/8" NPT 90® elbow. The gas line can
be rigid pipe or to make installation easier, use a listed flexible
connector and/or copper tubing if allowed by local codes.
Since some municipalities have additional local codes it is
always best to consult with your local authorities and the CAN/
CGA B149 installation codes. For USA installations follow
local codes and/or the current National Fuel Gas Code, MISI
Z223.1.
When using copper or flex connectors use only approved
fittings. Always provide a union so that gas lines can be easily
disconnected for burner and/or valve servicing. Flare nuts for
copper lines and flex connectors are usually considered to
meet this requirement.
Important: Always check for gas leaks with a soap and
water solution or gas ieak detector. Do not use open flame
for leak testing.
Note: Prior to any pressure testing of the gas supply
piping system that exceeds test pressures of f/2
psig, this appliance must be disconnected from
the piping system, if test pressures equal to or
less than 1/2 psig are used then this appliance
must be isolated from the piping system by clos¬
ing its individual manual shut-offvalve during the
testing.
System Data - U27
For 0 to 4500 feet altitude
Burner Inlet Orifice Sizes:
Natural Gas
Propane
Burner
#40
#53
Max. Input Rating
27,000 Btu/h
Min. Input Rating
13,500 Btu/h
Output Capacity with blower Off*
Natural Gas
20,655 Btu/h
Propane
20,871 Btu/h
Output Capacity with blower On*
Natural Gas
21,060 Btu/h
Propane
21,330 Btu/h
*See page 6 for manufactured home information.
Supply Pressure
Natural Gas min. 5.0" w.c.
Propane
min. 12.0" w.c.
Manifold Pressure
Natural Gas
3.8" +/- 0.2" w.c.
Propane
11"
+/-0.2"w.c.
This unit is approved in Canada for altitude 0 ft to 4500 ft. (CAN/
CGA-2.17-M91). For Natural Gas installations above 4500 ft.
follow current CAN/CGA-B149.1.
AERATION ADJUSTMENT
The burner aeration is factory set but may need adjusting due to
either the local gas supply, air supply or altitude.
Natural Gas:
3/16" open
Propane:
5/16" open
The aeration adjustment gears are located on the right side of
the burner box and can be accessed from the side or from the
front when the louvers are removed.
To adjust the aeration: use the alien key to turn the turning
gear which will adjust the air shutter. Open the air shutter for
a blue flame or close it for a yellower flame. This adjustment
is performed by a qualified installer. Thefactory setting should
be sufficient for most installations.
Closed -Tall yellow flame
Open -Short blue flame
Clockwise to open, counter-clockwise to close.
Caution: Carbon will be produced if the air shutter is
closed too much.
Note: Any damage due to carboning resulting from
improperly setting the aeration controls is NOT
covered under warranty.
U27-1 Regency ULTIMATE Rear Vent Direct Vent Freestanding Gas Heater
13
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