Freeze Protection; Special Wiring Notes; Common Wiring Options; Single Stage Heating Systems Label Cross Reference - Lux Products PurePro Everything'Stat DP722 Installation And Operating Instructions Manual

9. W2 This terminal is active when the thermostat
is calling for a second stage of furnace or electric
heat. It will remain inactive unless two stages of
heating have been specified in the installer setup
menu.
10.E This terminal is active when the thermostat
is calling for Emergency heat in a heat pump sys-
tem. This terminal also powers freeze protection if
it is desired. It will be active below 40°F(5°C)
regardless of mode or battery condition or other
unforeseen condition.
11.B This terminal is live at any time the unit is
in Heat mode.
12.TC Future indoor temperature sensor common.
May be wired to a maximum of three external
indoor sensor units.
13. T Future indoor temperature sensor. May be
wired to a maximum of three external indoor sen-
sor units.
14.OT Future first of two terminals dedicated to
the outdoor temperature sensor. Polarity of these
leads does not matter.
15.OT Future second of two terminals dedicated to
the outdoor temperature sensor. Polarity of these
leads does not matter.

3.5.2 FREEZE PROTECTION

The DP722 incorporates a mechanical thermal switch
which may be used to prevent a freeze-up by calling for
heat in the event the unit has accidentally been turned off
or its batteries have not been replaced as recommended.
This switch is available at the E terminal of the thermo-
●
stat. In most systems using this feature will require
wiring a jumper between the W1 and E terminals. The
thermostat will call then for the first stage of heat, in fur-
nace mode, or Aux heat in heat pump mode. See EMER-
GENCY HEAT.
The nominal temperature set point of this switch is
●
40°F(5°C).

3.5.3 SPECIAL WIRING NOTES

In heat pump mode, AUX heat is available at W1.
●
In heat pump mode, Emergency Heat is activated from
●
the E terminal. This terminal also provides freeze protec-
tion and it will be active below a nominal temperature of
40°F(5°C).

3.5.4 COMMON WIRING OPTIONS

Though not shown here additional second stages may be
used where applicable. Be sure to enable them properly
in the Installer Setup menu.
W2 is second stage heat
E is emergency heat and freeze protection
Y2 is second stage cool or second stage heat pump
OPTIONAL O or B terminals may be used to power heat-
ing dampers or changeover valves in any system config-
uration.
OPTIONAL C terminal may be connected to a system
common to power the thermostat from the system in any
wiring configuration.
WARNINGS: 1. A B wire is sometimes used as a
common wire. Connecting a common B wire to the B termi-
nal in these systems will likely cause damage to the thermo-
stat and/or HVAC system. Do not connect a wire to the B ter-
minal if you are unsure whether it may be wired to a system
common.
2.If Both Y and C wire are present, then C is common. Tape it
off or connect it to the C terminal to allow the system to
power the thermostat.
OPTIONALC, X, B, TC C
B
O
3.5.5 SINGLE STAGE HEATING SYSTEM LABEL CROSS
REFERENCE
Previ o us Thermostat
System Termi n al Marki n g
Al l 2 Wi r e Heat RH, R, RC, V, 5
W, H, 4
3 Wi r e RH, R, RC, V, 5
W, 4
B, C
3 Wi r e
(one wi r e i s "F or G") RH, R, 5, V
W, 4
G, F
3.5.6 SINGLE STAGE COOLING SYSTEM LABEL CROSS
REFERENCE
Previ o us Thermostat
System Termi n al Marki n g
2 Wi r e RC, R, V
Y, Y1, C
3 Wi r e RC, R, V
Y, Y1, C
G, F
3.5.7 SINGLE STAGE FURNACE HEATING AND SINGLE
STAGE COOLING SYSTEM LABEL CROSS REFERENCE
Previ o us Thermostat
System Termi n al Marki n g
4 Wi r e
(heat & cool wi t h
si n gl e transformer) RH, RC, R, V
W, W1
Y, Y1, C
G,F
5 Wi r e
(heat & cool wi t h
two transformers) RH
RC
W, W1
Y, Y1, C
G,F
4
Transformer Common
B Changeover Val v e
O Use O or B not both
New Thermostat
Termi n al s Wi r e To
RH Transformer
W1 Heati n g Val v e
RH Transformer
W1 Heat Control
Tape Off * *
RH Transformer
W1 Heati n g Val v e
G Fan Rel a y
New Thermostat
Termi n al s Wi r e To
RC Transformer
Y1 Cool i n g Rel a y
RC Transformer
Y1 Cool i n g Rel a y
G Fan Rel a y
New Thermostat
Termi n al s Wi r e To
RH & RC, w j u mper Transformer
W1 Heati n g Rel a y
Y1 Cool i n g Rel a y
G Fan Rel a y
RH Heati n g Transformer
RC Cool i n g Transformer
W1 Heati n g Rel a y
Y1 Cool i n g Rel a y
G Fan Rel a y