Nortek MG1 Series, Installation Instructions Manual

Page: 17 / 32

17
The gas supply to your home will either be Natural Gas
or L.P. Your furnace is factory equipped to operate on
Natural Gas. If your gas supply is L.P., you must contact
a qualified serviceman or gas supplier to convert the
furnace. Instructions for conversion to propane are shown
on page 19 . Factory installed orifice sizes are listed in
Table 6, (page 17) .
For natural gas operation, the maximum inlet pressure
for the valve is 7” W.C and the minimum inlet pressure
is 4.5” W.C. Pressure is reduced to 3 1/2” W.C. by the
pressure regulator in the gas valve.
For LP gas, pressure to the gas valve must be more than
11” W.C. but not more than 13” W.C. Pressure is reduced
to 10” W.C. by the pressure regulator in the gas valve.
Leak Check
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks
to check all connections. A fire or explosion
may result causing property damage, personal
injury or loss of life.
Table 6. MG1 Furnace Specifications - Factory Settings
FURNACE
MODEL #
INPUT
MBTU/H
OUTPUT
MBTU/H
ORIFICE NO
E.S.P.
IN WC
IGNITOR
DIRECT
COMB.
BLOWER
MOTOR
HP
A/C READY
TONS
NAT. LP
MG1E-056 56 45 29 45 0.3 Y Y 3/4 4
MG1E-070 70 57 24 42 0.3 Y Y 3/4 4
MG1E-077 77 62 21 40 0.3 Y Y 3/4 4
MG1E-090 85 68 17 36 0.3 Y Y 3/4 4
NOTES:
• Electrical Supply: 120 volts, 60HZ, 1 Ph. Fuse or
Breaker - 15 amps
• Temperature Rise: 45° F to 75° F
• High Altitude for US and Canadian installations:
See High Altitude section on page 18 .
• Thermostat Circuit: 24 volts, 60HZ, 30 vac
• Normal Anticipator Setting: 0.4
• Manifold Pressure for Natural Gas: 3.5” w.c.
• Manifold Pressure for LP Gas: 10” w.c.
AVERTISSEMENT :
RISQUE D’INCENDIE OU D’EXPLOSION
Le non-respect des avertissements de sécurité pourrait
entraîner des blessures graves ou des dommages matériels
importants.
N’effectuez jamais d’essai d’étanchéité des gaz avec une
flamme nue. Utilisez une solution savonneuse offerte sur
le marché conçue spécialement pour la détection des
fuites pour vérifier tous les raccordements. Un incendie ou
une explosion pourrait survenir et causer des dommages
matériels, des blessures ou des pertes de vie.
Figure 28. Honeywell Gas Valve
PRESSURE
REGULATOR
CAP
N
AT N
AT
N
AT N
AT
L
P
L
P
OR
OTHER SIDE
OF CAP
OUTLET PRESSURE
TAP (1/8 NPT)
INLET PRESSURE
TAP (1/8 NPT)
• The main gas valve and main power disconnect to
the furnace must be properly labeled by the installer
in case emergency shutdown is required.
• Flexible gas connectors are not recommended for
this furnace but may be used if allowed by local
jurisdiction. Only new flexible connectors may be
used. DO NOT reuse old flexible gas connectors.
• Best practice is to use a drip leg for a vertical run
to the unit.
• All piping shall be black iron pipe. Internally tinned
copper tubing may be used for gas supply systems.
• Fuel line installations other than typical installations
shown in Figure 27 must comply with the fuel piping
provisions stated in the Federal Manufactured Home
Standard (H.U.D. TITLE 24, PART 3280) and the
National Fuel Gas Code (ANSI-Z223.1/NFPA-54).
• Shut-off valve must be designed and listed for use
with liquid petroleum (L.P. gas).
• Plugged tappings (1/8” NPT) for test gauge
connection are present on the gas valve. See Figure
27 for locations.
NOTE: Optional fuel inlet lines are available for all gas
furnace models to permit the addition of a 1/2” F.P.T.
shut-off valve above the floor.