Lennox G60UHV?36A?070 - Page 36

Page 36
TABLE 28
OPERATING SEQUENCE
G60UHV, Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit
OPERATING MODE SYSTEM DEMAND SYSTEM RESPONSE
System
Condition
Thermostat
Demand
*Relative Humidity
(EfficiencyPlus Lights)
****Compressor
Speed
Blower CFM
(COOL)
Comments
Normal o
p
eration
Y1 No demand. Acceptable Low
**42%/46% of
HIGH COOL
Compressor demand and indoor
blower s
p
eed controlled b
y
Normal
operation
Y2 No demand. Acceptable High HIGH COOL
blower
speed
controlled
by
thermostat demand
Y1 No demand. Acceptable Low
**42%/46% of
HIGH COOL
Call for humidity
removal during
Y1
Humidity level rises slightly
(1) above setpoint. Demand
initiated.
Low
**42%/46% of
HIGH COOL
Dehumidification mode does not begin
until after initial thermostat demand is
removal
during
1st−stage cooling
demand
Demand
satisfied
Humidity level remains
slightly (1) above setpoint.
Demand continues.
Off
Off
until
after
initial
thermostat
demand
is
satisfied and new cooling demand is
initiated.
Y1
Humidity level remains
slightly (1) above setpoint.
Demand continues.
High
***65%/60% of
HIGH COOL
Significant increase in
humidity during
Y1
No demand. Acceptable
Low
**42%/46% of
HIGH COOL
If humidity rises significantly above set-
point, or if slide switch is moved signifi-
l i ill i di l i d
h
um
idit
y
d
ur
i
ng
thermostat cooling
demand.
Y1
Humidity level rises signifi-
cantly (2 or more) above
setpoint. Demand initiated.
High
***65%/60% of
HIGH COOL
point,
or
if
slide
switch
is
moved
signifi
cantly, unit will immediately go into de-
humidification mode (in presence of
thermostat demand).
Y1
Humidity level
above setpoint.
High
***65%/60% of
HIGH COOL
When humidity demand is satisfied,
Humidity demand
satisfied durin
g
Y1
Humidity level falls below
setpoint. No demand.
High
HIGH COOL
When
humidity
demand
is
satisfied,
blower immediately shifts to the COOL
CFM in order to hasten the end of the
cycle Unit can only shift out of high
satisfied
during
thermostat demand.
None
No demand. Acceptable
Off
Off
cycle. Unit can only shift out of high
speed compressor operation at begin-
Y1
No demand. Acceptable
Low
**42%/46% of
HIGH COOL
speed
compressor
operation
at
begin
ning of next cycle.
Call for humidity
Y2
No demand. Acceptable
High
HIGH COOL
Call for humidity
removal during 2nd
stage thermostat
demand
Y2
Humidity level rises slightly
(1) above setpoint. Demand
initiated.
High
***65%/60% of
HIGH COOL
Blower immediately changes speed in
response to thermostat demand.
d
eman
d
Y2
No demand. Acceptable
High
HIGH COOL
*Call for 1st stage
cooling after call for
None
Humidity level is slightly (1)
above setpoint.
Off
Off
Dehumidification mode (high speed
compressor) begins with next thermo-
cooling a
f
ter call
f
or
humidity removal.
Y1
Humidity level is slightly (1)
above setpoint.
Low
**42%/46% of
HIGH COOL
compressor)
begins
with
next
thermo
stat demand after initial demand is sat-
isfied.
Call for 2nd stage
cooling after call for
None
Humidity level is slightly (1)
above setpoint.
Off
Off
Reduced blower speed (dehumidifica-
tion speed) begins immediately with
cooling a
f
ter call
f
or
humidity removal
Y2
Humidity level is slightly (1)
above setpoint.
High
***65%/60% of
HIGH COOL
tion speed
)
begins immediately with
thermostat demand
Call for cooling after
significant increase in
None
Humidity level is significantly
above setpoint (2 or more).
Off
Off
If humidity increases significantly over
setpoint, or if slide switch is moved,
unit immediately goes into dehumidifi
signi
f
icant increase in
humidity
Y1 or Y2
Humidity level is significantly
above setpoint (2 or more).
High
***65%/60% of
HIGH COOL
unit immediately goes into dehumidifi-
cation mode (in presence of thermostat
demand).
Humidity demand
satisfied between
None
Humidity level is slightly (1)
above setpoint.
Off
Off
While unit is not operating (no thermo-
stat demand), slide switch is moved
down and back up Blower and com
satisfied
between
thermostat demands
(unit off cycle).
Y1 or Y2
Humidity level falls below
setpoint. No demand.
High
HIGH COOL
down and back up. Blower and com-
pressor operate at high speed until
next thermostat demand.
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.
*IMPORTANT - If power to unit is turned on with thermostat calling for humidity removal, outdoor unit may be locked into high
speed indefinitely. To reset, move humidity slide switch all the way down then back up to desired setpoint (with unit running)
** Reduced blower speed is 42% of HIGH COOL for −36A and −36B units; 46% of HIGH COOL for −60C and −60D series units.
*** Reduced blower speed is 65% of HIGH COOL for −36A and −36B units; 60% of HIGH COOL for −60C and −60D series units.
****If the two−speed control on a two−speed outdoor unit is set for LATCH 2 (15 minutes) or LATCH 3 (30 minutes), the compres-
sor will latch into high speed after a Y1 demand has occurred for that period of time.