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High Altitude Installation
Unit nameplate ratings are based on equipment operation from sea
level to 2000 feet elevation above sea level.
required for high altitude installation, please refer to below chart
for rating information.
Table 4. High Altitude Derate Chart
HIGH ALTITUDE DERATE CHART NAT.
Unit Input
115k
2001
3000
112100 104100
High stage
84000
78100
Low stage
90k
87700
81500
High stage
65700
61100
Low stage
70k
68200
63300
High stage
51100
47600
Low stage
60k
58500
54300
High stage
43800
40700
Low stage
Inputs shown are with factory orifices @ 3.5"WC (High Fire)
1.8"WC (Low Fire)
Natural Gas heating value of 950 btu/cuft.
For LP installations. Models that require #49 orifices, for
altitudes from 7000 - 8000' orifices must be changed to #50.
Air Filter Installation
The packaged unit requires an air filter. The unit does not come
with a factory installed filter rack in it, however, two filter frame ac-
cessories are offered that will allow the installation of a filter within
the unit, BAYFLTR101 & BAYFLTR201. Otherwise a field supplied
filter rack must be installed by the installer in the return duct work.
Refer to Table1 to determine filter sizes for field supplied filter racks.
Table 5. Filter Sizes (field supplied filter rack)
NOMINAL
UNIT
CFM
SIZE(Sq Ft)
4*CY4024
800
4*CY4030
1000
4*CY4036
1200
4*CY4042
1400
4*CY4048
1600
4*CY4060
2000
*Filters must be installed in the return air system. The above square
footages are based on 300 F.P.M. face velocity. If permanent filters are
used, size per mfg. Recommendation with clear resistance of 0.05" W.C.
IMPORTANT: Air filters and media wheels or plates shall meet the test
requirements in UL 900.
No orifice changes
Altitude (In Feet)
4000
5000
6000
7000
96200 88100 86900 85600 85100
72100 66100 65100 64200 63800
75200 69000 68000 67000 66500
56400 51700 51000 50200 49900
58500 53600 52900 52100 51800
43900 40200 39600 39100 38800
50100 46000 45300 44700 44300
37600 34500 34000 33400 33200
FILTER
FILTER
RESISTANCE ("W.C.)
2.67
0.08
3.33
0.08
4
0.08
4.67
0.08
5.33
0.08
6.67
0.08
Electrical Wiring
HAZARDOUS VOLTAGE, MOVING PARTS, AND GAS
Bodily injury can result from high voltage electrical compo-
nents, fast moving fans, and combustible gas. For protection
from these inherent hazards during installation and service,
the electrical supply must be disconnected and the main
gas valve must be turned off. If operating checks must be
8000
performed with the unit operating, it is the technician's re-
sponsibility to recognize these hazards and proceed safely.
NOTE: This unit is factory wired for 230V. See wiring dia-
gram for 208V conversion.
Electrical Connections
Electrical wiring and grounding must be installed in accordance
with local codes or, in the absence of local codes, with the National
Electrical Code ANSI/NFPA 70, Latest Revision.
NOTE: For branch circuit wiring (main power supply to unit
disconnect), determine wire size for the length of run using the
circuit ampacity found on the unit nameplate and the N.E.C.
For more than 3 conductors in a raceway or cable, see the N.E.C.
for derating the ampacity of each conductor.
Run power supply Lines through weather-tight conduit
and secure to unit with strain relief
Figure 19. Power Wiring
Installer's Guide
!
WARNING
Page 19
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