Page 30
CBX40UHV
ELECTRIC HEAT DATA - CBX40UHV-042, CBX40UHV-048, AND CBX40UHV-060 (Continued)
SINGLE PHASE ELECTRIC HEAT CBX40UHV-042, CBX40UHV-048 and CBX40UHV-060
Model Number
No. of
Stages
Volts
Input
kW
Input
1
Btuh
Input
2
Blower
Motor Full
Load
Amps
3
Minimum
Circuit Ampacity
5
Maximum
Overcurrent Protection
Circuit
1
Circuit
2
Circuit
3
Circuit
1
Circuit
2
Circuit
3
THREE PHASE ELECTRIC HEAT
8 kW
5 lbs.
ECB40-8 (34W98)
Terminal block
1
208 6.0 20,500 7.4 30 - - - - - - 35 - - - - - -
220 6.7 22,900 7.4 31 - - - - - - 35 - - - - - -
230 7.3 25,100 7.4 32 - - - - - - 35 - - - - - -
240 8.0 27,300 7.4 33 - - - - - - 35 - - - - - -
10 kW
6 lbs.
ECB40-10 (34W99)
Terminal block
1
208 7.5 25,600 7.4 36 - - - - - - 40 - - - - - -
220 8.4 28,700 7.4 37 - - - - - - 40 - - - - - -
230 9.2 31,400 7.4 38 - - - - - - 40 - - - - - -
240 10.0 34,100 7.4 40 - - - - - - 40 - - - - - -
15 kW
12 lbs.
ECB40-15CB (35W00)
50A Circuit breaker
1
208 11.3 38,400 7.4 49 - - - - - - 50 - - - - - -
220 12.6 43,000 7.4 51 - - - - - -
4
60 - - - - - -
230 13.5 47,000 7.4 52 - - - - - -
4
60 - - - - - -
240 15.0 51,200 7.4 55 - - - - - -
4
60 - - - - - -
20 kW
19 lbs.
ECB40-20CB (35W01)
(2) 35A Circuit breaker
2
208 15.0 51,200 7.4 36 26 - - -
4
40
4
30 - - -
220 16.8 57,300 7.4 37 28 - - -
4
40
4
30 - - -
230 18.4 62,700 7.4 38 29 - - -
4
40
4
30 - - -
240 20.0 68,200 7.4 40 30 - - -
4
40 35 - - -
25 kW
19 lbs.
ECB40-25CB (35W02)
(1) 50A & (1) 40A Circuit
breaker
2
208 18.8 64,100 7.4 42 33 - - -
4
45
4
35 - - -
220 21.0 71,700 7.4 44 34 - - -
4
45
4
35 - - -
230 23.0 78,300 7.4 45 36 - - - 50 40 - - -
240 25.0 85,300 7.4 47 38 - - - 50 40 - - -
NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.
1
Electric heater capacity only - does not include additional blower motor heat capacity.
2
Amps shown are for blower motor only.
3
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
4
Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on Page 6.
5
HACR type circuit breaker or fuse.
OPTIONAL HUMIDITY CONTROL (A20)
ComfortSense
®
7000 Thermostat
The Lennox ComfortSenset 7000 thermostat (shown
below) monitors indoor humidity conditions and creates a
dehumidification demand in response to indoor humidity
just as it creates a cooling demand in response to indoor
temperature. This thermostat adjusts compressor speed
and indoor blower speed to maintain humidity at a
comfortable level.
COOLING
TUE OCT 23 1:15PM
Principles of cooling with drier air
The humidity comfort range for humans is between 40 and
60 percent relative humidity (RH). 50% RH is the
recommended initial setpoint until personal comfort level is
established. The personal comfort level will vary with
humidity as with temperature. For example, if air at 75ºF
(24ºC) and 50% RH is changed to 60%, the air will feel
much warmer. Likewise, if the air is reduced to 40% RH, it
will feel much cooler.
Even when inactive, the body evaporates a large amount of
moisture away from the skin. This evaporation produces a
cooling effect (during wintertime, this phenomenon is called
“wind-chill”). Dry air is capable of absorbing more moisture
away from the skin, thereby increasing the cooling effect.
When the ComfortSense 7000 thermostat senses that the
indoor humidity level is above the control setpoint, the
control places the indoor fan and outdoor unit in a
dehumidification mode. To produce drier air, the indoor fan
will slow down the speed of the air crossing the indoor coil.
Because the air is moving much slower than normal, the
indoor coil is allowed to remove moisture from the air (a
higher percentage of the air passing over the coil is cooled
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