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Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit
O P E R A T IN G
S E Q U E N C E
S ystem
S tep
C ondition
N O C AL L F O R D E H U M ID IF IC ATIO N
N orm al O peration
1
Y 1
N orm al O peration
2
Y 2
R O O M TH E R M O S T AT C AL L S F O R F IR S T S T AG E C O O L IN G
B A S IC M O D E (only active on a Y 1 therm ostat dem and)
N orm al O peration
1
D ehum idification
2
C all
P R E C IS IO N M O D E (operates independent of a Y 1 therm ostat dem and)
N orm al O peration
1
D ehum idification
call
2
D ehum idification
1
call O N LY
R O O M TH E R M O S T AT C AL L S F O R F IR S T AN D S E C O N D S T AG E C O O LIN G
B A S IC M O D E (only active on
1
N orm al O peration
D ehum idification
2
C all
P R E C IS IO N M O D E (operates independent of a Y 1 therm ostat dem and)
N orm al O peration
1
D ehum idification
call
2
D ehum idification
1
call O N LY
Jum pers at indoor unit w ith a tw o stage outdoor unit
C ut factory jum per from Y 1 to Y 2 or cut W 915 (Y 1 to Y 2)
W ith C ondensing unit - C ut W 914 (R to D S ) on furnace control
W ith H eat P um p - C ut W 914 (R to D S ) & W 951 (R to
*Normal operation first stage cooling blower speed is 70% COOL speed.
**Dehumidification blower speed is reduced to 70% of COOL.
*** In Precision Mode, thermostat will maintain room temperature up to 2°F (1.2°C) cooler than the set point.
506892-01
OPERATING SEQUENCE
S Y S T E M D E M A N D
T herm ostat D em and
W
W
Y 1 Y 2
G
1
2
O
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
a
Y 1 therm ostat dem and)
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
O n
R elative H um idity
C om pressor
S tatus
D
24
A cceptable
Low
V A C
24
A cceptable
H igh
V A C
A cceptable
24
Low
V A C
0
D em and
H igh
V A C
24
A cceptable
Low
V A C
0
D em and
V A C
H igh
0
D em and
H igh
V A C
A cceptable
24
H igh
V A C
0
D em and
H igh
V A C
24
A cceptable
Low
V A C
0
D em and
V A C
H igh
0
D em and
H igh
V A C
0)
on furnace control
Table 20
Issue 1251
S Y S T E M R E S P O N S E
B low er
C F M
C om m ents
(C O O L)
70% *
C om pressor and indoor
blow er follow therm ostat
dem and
100%
70% *
Reverse logic dehumidification
therm ostat energizes Y 2
and de-energizes
70% **
call for de -hum idification
70% *
D ehum idification m ode
begins w hen hum idity is
greater than set point
70% **
Reverse logic dehumidification
therm ostat w ill try to
maintain room humidity
70% **
setpoint by allow ing the
room space to m aintain a
cooler room therm ostat
setpoint***
100%
Reverse logic dehumidification
therm ostat energizes Y 2
and de-energizes D on a
70% **
call for de -hum idification
70% *
D ehum idification m ode
begins w hen hum idity is
70% **
greater than set point
Reverse logic dehumidification
70% **
therm ostat w ill try to
m aintain room hum idity
setpoint by allow ing the
room space to m aintain a
cooler room therm ostat
setpoint***
D
on a
Page 37 of 64
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