HEIL F8MVL - Furnace Maintenance and Safety

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441 01 2121 01
Table 15 − Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Con’t.)
(Tabulated Data Based on 21,000 Btuh High−Heat/14,500 Btuh for Low−Heat Per Burner, Derated 4 Percent for Each 1000
Ft. (305 M) Above Sea level)
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
6001 to
7000
(1829 to
2134)
675 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
700 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
725 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
750 46 3.6/1.7 46 3.8/1.8 45 3.7/1.8 45 3.8/1.8
775 46 3.4/1.6 46 3.5/1.7 46 3.6/1.7 46 3.8/1.8
800 47 3.6/1.7 47 3.8/1.8 46 3.4/1.6 46 3.5/1.7
825 47 3.4/1.6 47 3.5/1.7 47 3.6/1.7 47 3.8/1.8
850 48 3.7/1.7 48 3.8/1.8 47 3.4/1.6 47 3.5/1.7
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
7001 to
8000
(2134 to
2438)
650 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
675 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
700 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8
725 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8
750 47 3.5/1.7 47 3.7/1.8 47 3.8/1.8 46 3.5/1.6
775 48 3.8/1.8 47 3.4/1.6 47 3.6/1.7 47 3.7/1.7
800 48 3.6/1.7 48 3.7/1.8 48 3.8/1.8 47 3.4/1.6
825 48 3.3/1.6 48 3.5/1.6 48 3.6/1.7 48 3.7/1.8
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
8001 to
9000
(2438 to
2743)
625 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
650 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8
675 47 3.8/1.8 46 3.4/1.6 46 3.5/1.7 46 3.7/1.7
700 47 3.5/1.7 47 3.6/1.7 47 3.7/1.8 46 3.4/1.6
725 48 3.7/1.8 48 3.8/1.8 47 3.5/1.7 47 3.6/1.7
750 48 3.5/1.7 48 3.6/1.7 48 3.7/1.8 48 3.8/1.8
775 49 3.8/1.8 48 3.4/1.6 48 3.5/1.7 48 3.6/1.7
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
9001 to
10,000
(2743 to
3048)
600 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8 45 3.7/1.8
625 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7
650 47 3.4/1.6 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8
675 48 3.6/1.7 48 3.8/1.8 47 3.4/1.6 47 3.5/1.7
700 48 3.4/1.6 48 3.5/1.7 48 3.6/1.7 48 3.7/1.8
725 49 3.7/1.8 49 3.8/1.8 48 3.4/1.6 48 3.5/1.7
* Orifice numbers 43 are factory installed
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
CAUTION
!
The minimum maintenance on this furnace is as follows:
1. Check and clean air filter each month or more fre-
quently if required. Replace if torn.
2. Check blower motor and wheel for cleanliness each
heating and cooling season. Clean as necessary.
3. Check electrical connections for tightness and controls
for proper operation each heating season. Service as
necessary.
4. Inspect burner compartment before each heating sea-
son for rust, corrosion, soot or excessive dust. If neces-
sary, have furnace and burner serviced by a qualified
service agency.
5. Inspect the vent pipe/vent system before each heating
season for rust, corrosion, water leakage, sagging
pipes or broken fittings. Have vent pipes/vent system
serviced by a qualified service agency.
6. Inspect any accessories attached to the furnace such
as a humidifier or electronic air cleaner. Perform any
service or maintenance to the accessories as recom-
mended in the accessory instructions.