Nordyne M2RC-080 Installation Instructions Manual page 22

Furnace Furnace Rating No. of Elevation Elevation Elevation Elevation Elevation
Model Number Plate Input Burners 0 - 2000 2000-4000 4000-6000 6000-6000 8000-10000
M2R(C,L) - (Btuh) Nat LP Nat LP Nat LP Nat LP Nat LP
060A-16-B(* I 60tO00 4 49 56 49 56 50 57 50 57 51 58
080A-16-B(*) 80,000 4 45 55 46 55 49 56 49 56 50 57
100A-16-B(*) 100,000 5 45 55 46 55 49 56 49 56 50 57
*canbeNorL
Table 9. Approximate Orifice Size for Natural and LP Gases
To Remove the Burner Orifices:
1. Remove the four (4) fasteners that secure
the gas manifold to the burner box, as
shown in Figure 24. Carefully remove the
gas manifold assembly from the burner
box. Note that the gas manifold assembly
consists of the gas valve, the gas manifold,
and the orifices.
2. Carefully remove the burner orifices from
the gas manifold, as shown in Figure 24.
Honeywell
Valve
PRESSURE
REGULATOR
OTHER SIDE
OF CAP
CAUTION:
Caution: Do not re-drill the burner odfices.
If the orifice size must be changed, use
only new orifices.
Note: The size of the new orifices that will
be installed into the unit will depend upon
the type of conversion (sea level or high
altitude; natural gas or LP gas),
To Convert the Unit to the Alternate Gas
1. Remove the orifice bag from the manifold
of the unit.
2. Install the appropriate gas burner orifices
into the gas manifold. Remember if install-
ing in the United States at altitudes above
2,000 feet to install the proper orifices,
shown in Table 6. When installing the new
orifices, DO NOT use pipe joint com-
pound on the orifice threads. Screw the
orifices into the manifold by hand until
snug to eliminate cross threading, then
tighten with a wrench. Before installing an
orifice, check the face or side of the orifice
for the drill number to ensure that it is the
appropriate size.
3. For the conversion to the alternate fuel,
the gas valve regulator cap must be
turned over, as shown in Figure 22. You
will unscrew the cap and reinstall for your
installation. After reinstalling the cap, you
will be able to read "NAT" for the conver-
sion to natural gas or "LP for the conver-
sion to LP gas.
Figure 22. Convertible Pressure
Regulator Cap
Figure 23. Burner Inspection
Burner Gas
Orifices Manifold
Flame
_t ,_;f_i O bservatiOn
Inlet
, Cover
Tap Inlet Gas Plate
Valve
Figure 24. Typical Installation For Sealed
Burner Box With Access Cover Plate
22