G61Mpv, Ccb1 And Single−Speed Outdoor Unit - Lennox G61MPV Service Manual

TABLE 20
Heating Mode Blower Speeds
Speed
1 − Low
2 − Medium Low
(Factory)
3 − Medium High
4 − High
On−Board Jumper W914
On−board jumper W914, which connects terminals DS and
R on the integrated control board, must be cut when the fur-
nace is installed with either the Harmony III zone control
board or a thermostat which features humidity control. If
the jumper is left intact the PWM signal from the HARMO-
NY III control will be blocked and also lead to control dam-
age. Refer to table 21 (CCB1) and table 23 (SignatureS-
tatt) for operation sequence in applications including
G60DFV, a thermostat which features humidity control and
a single−speed outdoor unit. Table 22 (CCB1) and table 24
(SignatureStat) gives the operation sequence in applica-
tions with a two−speed outdoor unit.
OPERATING MODE
System Condition
Normal operation
*Call for humidity
removal during
cooling demand
Dehumidification
demand satisfied
during cooling demand.
Call for cooling after call for
humidity humidity
removal.
Humidity demand
satisfied between
th t t d d ( it
thermostat demands (unit
off cycle).
NOTE − When changing unit mode of operation from cooling to heating, indicating lights that are on will stay on until the first thermostat heating
demand.
* Reduced blower speed is 70% of COOL
Switch 11 Switch 12
On On
Off On
On Off
Off Off
G61MPV, CCB1 and Single−Speed Outdoor Unit
SYSTEM DEMAND
Thermostat *Relative Humidity
Demand (EfficiencyPlus Lights)
No demand. Humidity
Y1
level is acceptable
Humidity level rises above
Y1
setpoint. Demand initiated.
Humidity level falls below set-
Y1
point. No demand
Humidity level above setpoint.
None
Demand initiated.
Humidity level above setpoint.
Y1
Demand initiated.
None Over setpoint (1 or more)
Y1 Change to acceptable
On−Board Jumper W951
On−board jumper W951, which connects terminals R and O
on the integrated control board, must be cut when the fur-
nace is installed in applications which include a heat pump
unit and a thermostat which features dual fuel use. If the
jumper is left intact, terminal O" will remain energized elim-
inating the HEAT MODE in the heat pump.
On−Board Jumper W915
On−board jumper W915, which connects terminals Y1 and
Y2 on the integrated control board, must be cut if two−stage
cooling will be used. If the jumper is not cut the outdoor unit
will operate in second stage cooling only.
Status LEDs (SPEED, CFM, E−COM)
The green SPEED LED indicates circulating blower speed
in response to the DS signal. The LED is lit during normal
blower operation and is off during a dehumidification de-
mand. In Harmony III applications, the brightness of the
LED indicates the requested blower speed.
The green CFM LED indicates the blower air flow. Count
the number of blinks between the two−second pauses to
determine the CFM. Each blink represents approximately
100 CFM.
The green E−COM LED indicates that the control is receiv-
ing and processing of commands and inputs. The LED may
flash rapidly or may display a single flash, depending upon
the activity.
TABLE 21
Blower CFM
(COOL)
COOL
70%
of COOL
COOL
Off
70%
of COOL
Off
COOL
Page 35
SYSTEM RESPONSE
Comments
Compressor demand and indoor blower speed
controlled by thermostat demand.
Call for dehumidification initiated by CCB1 control.
Indoor blower speed reduced by CCB1 control.
When humidity demand is satisfied, blower speed
immediately increases to the COOL CFM to has-
ten the end of the cycle.
Dehumidification mode begins when relative hu Dehumidification mode begins when relative hu-
midity is greater than setpoint.
While unit is not operating (no thermostat de-
mand), slide switch is moved down and back up. mand), slide switch is moved down and back up.
Blower operates at COOL CFM.