Condenser Fan Speed Control - Lennox CLIMATIC 40 User Manual

ADVANCED FUNCTIONS
10.- CONDENSER FAN SPEED CONTROL (EXCEPT HYDROLEAN)
The function of the fan speed control is to prevent very low condensing temperatures during cooling mode operation at outside tempe-
ratures of between 0ºC and 46ºC.
Depending on the unit, this function could be:
1.1.- PROPORTIONAL CONTROL BASED ON PRESSURE
Models: ECOLEAN: . . . . . . EAC + kit -15ºC and EAR 251-812 SM
AIRCOOLAIR: . . . ANCM + kit -15ºC and ANHM 22E-86D
AIRCUBE:. . . . . . . KSCM + kit -15ºC and KSHM 22E-86D
In this case, it is a proportional fan speed control, which varies the fan voltage supplied to the fan.
FAN SPEED
100%
40%
0%
18 18.5
1.2.- PROPORTIONAL CONTROL BASED ON PRESSURE TEMPERATURE
Models: ECOLEAN: . . . . . . EAC 251-812 SM
AIRCOOLAIR:
AIRCUBE:. . . . . . . KSCM 22E-86D
In this case too, it is a proportional fan speed control, which varies the voltage supplied to the fan.
FAN SPEED
100%
40%
0%
18 19 28
1.3.- ON/OFF CONTROL BASED ON PRESSURE
Models: ECOLEAN:
AIRCOOLAIR:
AIRCUBE:
ON/OFF, through the control and change between high and low fan speed through pressure switches.
The fans for these models incorporate 2 speeds. The fans work on high or low speed according to :
COOLING MODE:
The on/off and low/high fan speed is managed according to the
condensing pressure. See the illustration below:
COOLING MODE
High speed
Low speed
0ºC
22 bar
NOTE*: In these same models, but in cooling only version, the fan speed management is the same, apart from that, the ON/OFF signal
is provide by a pressure switch instead of the control.
CLIMATIC 40 User manual • MUL37E-0607 / 10-2008
20
. . ANCM 22E-86D
CONDENSER TEMPE-
40 RATURE (ºC)
EAR* 1003-1804 SM
ANHM* 112D-152D
KSHM* 112D-214D
15ºC 30ºC 35ºC
Approx. outside temperature ºC
28 bar 30 bar 37 bar
Condensing pressure
NOTE
At start-up the fan works at maximum speed for 20 seconds, so
as to overcome the mechanical inertia of the motor.
CONDENSER PRESSURE (bar)
26
NOTA
At start-up, the fan works at maximum speed for 20 seconds, so
as to overcome the mechanical inertia of the motor.
The same time is observed with regard to compressor start-up
(irrespective of the condensing temperature) in order to improve
temperatures probes reading.
HEATING MODE (heat pump units only). The low/high fan speed
is managed according to the outdoor temperature thermostat.
See the illustration below:
High speed
Low speed
HEATING MODE
Outdoor tempera-
ture ºC
+7ºC
• 16 •