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PG 5
7 Install Batteries
The 8050C requires batteries to operate your system
and retain its programming in memory.
.
Switch MODE switch to OFF and the FAN switch to
AUTO.
.
Insert 2 AA alkaline batteries according to the
polarity noted in the compartment.
.
Press the RESET button to clear the transient
program memory. Initially, LCD display will go off.
NOTE: Replace the batteries when this LOW battery
indicator appears on the display or once a year.
With batteries removed, you have approximately
30sec before your custom programming is lost.
5 Gas-Electric Selection
8 Power Options
PG 6
I
REFER to the back of the Control Unit:
If you have Electric Heat or a Heat Pump you must place the Gas/Electric jumper in the ELECT
position (thermostat controls the Fan).
If you have Gas Heat the Gas/Electric Jumper should be in the GAS position (furnace controls
the Fan).
If you have a HEAT PUMP:
.
Change the NORMAL/PUMP
switch on the back of the unit
to PUMP.
.
I
f your heat pump has auxiliary
heat, select the DIFFERENTIAL
jumper. This controls how often
your auxiliary heat will come on.
'2' is most comfort (cold climates)
'4' is most efficient (warm
climates)
The unit must be reset when a
jumper is changed.
S
E
T
C
L
O
C
K
S
D
P
F
I
L
T
E
R
R
E
V
I
E
W
H
OM
E
T
E
M
P
H
O
L
D
C
O
P
Y
P
R
O
G
R
A
M
T
I
M
E
S
L
O
T
E
M
E
R
G
E
N
C
Y
T
I
M
E
S
E
T
R
E
S
E
T
N
EXT
P
TI
M
E
TI
M
E
D
A
Y
M
O
D
E
F
A
N
AA
AA
B
AT
T
E
R
Y
Please be aware of the following power options
1) The 8050C can run on batteries only. (2AA Alkaline)
The batteries will last well over 1 year. If the batteries are not replaced the thermostat
will stop working.
2) The 8050C can run on the C wire if available. (24 VAC ONLY)
As shown in the wiring diagrams, The C wire is the other side of the 24VAC heating transformer.
If the C wire is used, the batteries are for AC power loss only and are not required.
A
C
W2
RC
O
B
RH
W
Y
G
SHORT C
ON F
SHORT24
OPEN12
NORMAL PUMP
2 3 4
GAS
ELECT
Gas / Electric
jumper
Circuit
Board
Differential
jumper
o
C -
o
F
jumper
Normal/Heat Pump
switch
12/24hr
jumper
6 Heat Pump Switch