036-21489-001-C-1004
Unitary Products Group
21
NOTE:
This unit does NOT REQUIRE a heat pump thermo-
stat. It is designed to work with a standard two-stage cool,
two-stage heat thermostat; however, the thermostat must
provide a “G” signal when there is a call for “W1”.
FIGURE 3:
ELECTRONIC THERMOSTAT FIELD WIRING
W 2
R C
R H
Y 1
Y 2
W 1
G
C
X 1
X 3
X 4
A 1
A 2
T
T
T H E R M O S T A T *
T E R M I N A L S
U N I T T E R M I N A L S
S T R I P T B 1
* E l e c t r o n i c p r o g r a m m a b l e T h e r m o s t a t 2 E T 0 7 7 0 0 1 0 0 2 4 ( i n c l u d e s s u b b a s e ) .
T e r m i n a l s A 1 a n d A 2 p r o v i d e a r e l a y o u t p u t t o c l o s e t h e o u t d o o r
e c o n o m i z e r d a m p e r s w h e n t h e t h e r m o s t a t s w i t c h e s t o t h e s e t - b a c k p o s i t i o n .
2 4 V o l t
T r a n s f o r m e r
T O R E M O T E S E N S O R
2 E T 0 4 7 0 1 3 2 4 I F U S E D
O C C
W 1
W 2
Y 1
G
Y 2
X
R
S D
C
RE
M
OT
E
M
IN
P
OS
The thermostat must provide a “G” signal
when there is a call for “W1.”The unit control
board will energize the indoor blower when
the compressors are energized; however, if
the thermostat calls for “W2” during the anti-
short-cycle delay, the electric heat (when
installed) will be energized immediately
upon the call for “W2.”
FIGURE 4 : FIELD WIRING 24 VOLT THERMOSTAT
O C C
W 1
W 2
Y 1
G
Y 2
X
R
S D
C
R
E
M
O
TE
M
IN
P
O
S
W 1
W 2
Y 1
G
Y 2
C
U N I T C O N T R O L
B O A R D
T - S T A T
R H
R C
The thermostat must provide a “G” signal
when there is a call for “W1.”The unit control
board will energize the indoor blower when
the compressors are energized; however, if
the thermostat calls for “W2” during the anti-
short-cycle delay, the electric heat (when
installed) will be energized immediately
upon the call for “W2.”
