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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
120k
2001
3000
High stage
117000 108700 100400 92000 90700 89400 88800
Low stage
87700
81500
96k
High stage
93600
87000
Low stage
70200
65200
75k
High stage
73100
67900
Low stage
54800
51000
64k
High stage
62400
58000
Low stage
46800
43500
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 Table 5 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.
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
performed with the unit operating, it is the technician's re-
sponsibility to recognize these hazards and proceed safely.
No orifice changes
Altitude (In Feet)
4000
5000
6000
7000
75300 69000 68000 67000 66600
80300 73600 72600 71500 71000
60200 55200 54400 53600 53300
62700 57500 56700 55900 55500
47100 43100 42500 41900 41600
53500 49100 48400 47700 47300
40200 36800 36300 35700 35500
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
WARNING
NOTE: This unit is factory wired for 230V. See wiring dia-
gram in SERVICE FACTS 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.
8000
For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
Figure 19. Power Wiring
Electrical Power
It is important that proper electrical power be available for the unit.
Voltage variation should remain within the limits found on the unit
nameplate.
Disconnect Switch
Provide an approved weatherproof disconnect within close proxim-
ity and within sight of the unit.
to the cabinet, the location shown in Figure 21 should be the only
one considered.
Over Current Protection
The branch circuit feeding the unit must be protected as shown on
the unit nameplate.
Power Wiring
The power supply lines must be run in weather-tight conduit to the
disconnect and into the side of the unit control box. Provide strain
relief for all conduit with suitable connectors.
Provide flexible conduit supports whenever vibration transmission
may cause a noise problem within the building structure.
1. Remove the CONTROL/HEAT access panel. Pass the power
wires through the Power Entry hole in the end of the unit.
See Figure 19.
2. Connect the high voltage wires to the appropriate contactor lug
terminals. Single phase units use a two (2) pole contactor
and three phase units use two (2) pole contactor and a Blue
lead wire. Connect the ground to the ground lug on the chas-
sis. See Figure 20. Be sure all connections are tight.
GROUNDING: THE UNIT MUST BE ELECTRICALLY
GROUNDED IN ACCORDANCE WITH LOCAL CODES OR
THE NATIONAL ELECTRIC CODE.
NOTE: Unit must be grounded for ignitor to operate properly.
Gas pipe to unit is not an adequate ground. Ground the unit
internally as provided.
Installer's Guide
Run power supply
Lines through
weather-tight con-
duit and secure
to unit with strain
relief
If disconnect must be mounted
Page 19
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