High-Altitude Accessory Kit - Modine Manufacturing PTC Installation And Service Manual

InsTAllATIon - HIgH AlTITude ACCessorY KIT
HIgH AlTITude ACCessorY KIT
Modine's gas-fired equipment standard input ratings are
certified by ETL. For elevations above 2,000', ANSI Z223.1
requires ratings be reduced 4 percent for each 1,000' above sea
level. For units in Canada, CSA requires that ratings be reduced
10 percent at elevations above 2,000' The high altitude
adjustment instructions and pressure switch kits listed
in this manual are for use with units that will be installed over
2,000'. These methods and kits comply with both ANSI Z223.1
and CSA requirements.
If a unit is to be installed at higher elevations AND converted from
natural gas to propane gas operation, a propane conversion kit
must be used in conjunction with the pressure adjustment
methods and pressure switch kits listed herein. For the Selection
and Installation Instructions for propane conversion kits, please
see the latest revision of Modine Manual 75-515.
selection of the Proper Pressure and Kit
To determine the proper manifold pressure at altitude and if
required, the proper combustion air pressure switch kit, the full
model number of the heater, the fuel to be used, and the
altitude the unit will be installed at must be known. Refer to the
unit serial plate or carton label to obtain the necessary
information about the unit.
After obtaining this information, refer to the gas pressure and
selection charts shown in Tables 15.1 through 15.3. The pressure
charts are differentiated by elevation, fuel type, and country
the product is being installed in. The selection charts are
differentiated by product type, altitude and fuel type. If
converting from natural gas to propane gas and operation
at high altitude, both a propane conversion kit and a
pressure switch kit must be used (if applicable). Selection
charts include the proper kit suffix, when required.
Table 15.1 - natural gas Heating values at
Altitude
➀ ➂ ➃
gas Heating values at Altitude (BTu/ft
Altitude (ft)
0-2,000
2,001-3,000
3,001-4,000
4,001-4,500
4,501-5,000
5,001-6,000
6,001-7,000
7,001-8,000
8,001-9,000
9,001-10,000
➀ Values shown are for 3.5" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 16.1 to calculate manifold pressure.
➁ Values shown are for 10.0" W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 16.1 to calculate manifold pressure.
➂ When installed at altitudes above 2,000', a pressure switch may need to be changed. Refer to Table 15.3 to determine if a switch change is required.
➃ G as heating values are derated 4% per 1,000' of elevation in the USA and 10% between 2,000' and 4,500' elevation in Canada in accordance with ANSI Z223.1
and CSA-B149, respectively.
Table 15.3 - High Altitude Kits for PTC/BTC
model size details
Kit suffix
55-310
Item Code
➀ F or Label Only kits, Modine part number 5H0807146005 is required to be filled out and attached to the unit by the installer.
Please contact the local Modine representative at 1.866.828.4328 (HEAT).
usA Canada
1,050 1,050
929
892 945
874
856 856
822 822
789 789
757 757
727 727
698 698
➀
0-2,000 ft 2,001-4,500 ft
Not Required Label Only
manifold Pressure Adjustment
The inlet pressure to the unit must be confirmed to be within
acceptable limits (6-7" W.C. for natural gas and 11-14" W.C.
for propane gas) before opening the shutoff valve or the
combination gas valve may be damaged.
Heaters for use with natural gas have gas valves factory set at
3.5" W.C. manifold pressure at 7.0" W.C. inlet pressure.
Units for use with propane gas are set for 10.0" W.C. manifold
pressure at 14.0" W.C. inlet pressure.
Installation above 2,000'. elevation requires adjustment of the
manifold pressure as described.
derated BTu Content gas and manifold Pressure
Calculation
Some utility companies may derate the BTU content (heating
value) of the gas provided at altitude to a value other than 1,050
BTU/ft for natural gas or 2,500 BTU/ft
3
certain heating appliances to be used with no manifold pressure
adjustments. For this reason it is necessary that the supplying
utility be contacted for detailed information about the gas type
and BTU content (heating value) before operating any heater.
Tables 15.1 and 15.2 show the standard derated heating values
(4% per 1,000' of elevation in the USA and 10% between 2,001'
and 4,500' elevation in Canada) of natural and propane gases
at various altitudes. If the utility is supplying gas with heating
values as shown in Tables 15.1 and 15.2, the manifold pressure
should be set to 3.5" W.C for natural gas and 10.0" W.C. for
propane gas.
noTe: Only the high fire gas pressure need be adjusted; low
fire gas pressure should remain the same.
Table 15.2 - Propane gas Heating values at
Altitude
➁ ➂ ➃
)
3
Altitude (ft)
0-2,000
2,001-3,000
3,001-4,000
4,001-4,500
4,501-5,000
5,001-6,000
6,001-7,000
7,001-8,000
8,001-9,000
9,001-10,000
u.s.A. and Canada
4,501-5,500 ft 5,501-6,500 ft
Label Only Label Only
6-563.7
for propane gas to allow
3
gas Heating values at Altitude (BTu/ft
usA Canada
2,500 2,500
2,212
2,123 2,250
2,080
2,038 2,038
1,957 1,957
1,879 1,879
1,803 1,803
1,731 1,731
1,662 1,662
6,501-7,500 ft
Label Only
)
3
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