Page 35
TABLE 26
G60UHV−60D−135 BLOWER MOTOR PERFORMANCE
0.0" to 0.8" w.g. (0 through 200 Pa) External Static Pressure Range
Factory Settings: Heating Speed − 2; Cooling Speed − 4; Speed Adjust − NORM.
Return Air Options: Side return air with optional RAB return air base.
Speed Switch Positions
ADJUST"
Switch
Second Stage HEAT" Speed
Second Stage COOL" Speed
Switch
Positions
1
2
3
4
1
2
3
4
Positions
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
+
1425
675
1615
760
1795
845
1975
930
1505
710
1620
765
1815
855
2035
960
NORM
N/A
N/A
1455
690
1640
775
1805
850
1370
650
1470
695
1670
790
1850
875
N/A
N/A
N/A
N/A
1455
685
1630
770
1225
580
1320
625
1500
705
1670
790
ADJUST"
First Stage HEAT" Speed
First Stage COOL" Speed
ADJUST"
Switch
P
iti
1
2
3
4
1
2
3
4
S
tc
Positions
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
+
1305
615
1470
695
1655
780
1825
860
1075
510
1155
545
1295
610
1445
680
NORM
N/A
N/A
1345
635
1505
710
1670
790
980
465
1050
495
1175
555
1305
615
N/A
N/A
N/A
N/A
1340
635
1475
695
875
415
935
440
1070
505
1180
555
N/A − First and second stage HEAT positions shown cannot be used on this model.
NOTES − The effect of static pressure is included in air volumes shown.
First stage HEAT is approximately
91%
of the same second stage HEAT speed position.
First stage COOL (two−stage air conditioning units only) is approximately
70%
of the same second stage COOL speed position.
Continuous Fan Only speed is approximately
38%
of the same second stage COOL speed position − minimum 500 cfm (235 L/s).
Lennox Harmony III
t
Zone Control Applications − Minimum blower speed is 495 cfm (235 L/s).
TABLE 27
OPERATING SEQUENCE
G60UHV, Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit
OPERATING MODE
SYSTEM DEMAND
SYSTEM RESPONSE
System Condition
Thermostat
Demand
*Relative Humidity
(Efficiency
Plus
Lights)
Blower
CFM
(COOL)
Comments
Normal operation
Y1
No demand. Humidity
level is acceptable
COOL
Compressor demand and indoor blower
speed controlled by thermostat demand.
*Call for humidity
removal during
cooling demand
Y1
Humidity level rises
above setpoint. Demand
initiated.
60%/65%
of COOL
Call for dehumidification initiated by ther-
mostat. Indoor blower speed reduced by
thermostat.
Dehumidification
demand satisfied
during cooling de-
mand.
Y1
Humidity level falls below
setpoint. No demand
COOL
When humidity demand is satisfied, blow-
er speed immediately increases to the
COOL CFM to hasten the end of the cycle.
Call for cooling after
call for humidity
None
Humidity level above set-
point. Demand initiated.
Off
Dehumidification mode begins when rela-
call for humidity
removal.
Y1
Humidity level above set-
point. Demand initiated.
60%/65%
of COOL
Dehumidification mode begins when rela
tive humidity is greater than setpoint.
Humidity demand
satisfied between
None
Over setpoint (1 or more)
Off
While unit is not operating (no thermostat
demand) slide switch is moved down and
satisfied between
thermostat demands
(unit off cycle).
Y1
Change to acceptable
COOL
demand), slide switch is moved down and
back up. Blower operates at COOL CFM.
NOTE − When changing unit mode of operation from cooling to heating, indicating lights that are on will stay on until the first ther-
mostat heating demand.
* Reduced blower speed is 65% of COOL for the −36A and −36B units; 60% of COOL for −60C and −60D series units.
