Y594
(Multistage Thermostat Subbase)
Package
TRADELINE®
INSTALLATION INSTRUCTIONS
Subbase Ratings
APPLICATION
SWITCH RATING: 7.5A inrush, 2.5A running at 30 Vac.
MOUNTING: Designed for mounting on wall or horizontal
outlet box.
These Y594G and Y594J combination packs are designed
to meet the specific requirements of Carrier heat pump
equipment. The Y594 packs are designed for 2 stage heat
and 1 stage cool applications. The system switch is SUPL
HT-HEAT-OFF-COOL or SUPL HT-ON-OFF. The fan
switch is AUTO-ON. See Table 1 for model information
and cross reference from Carrier part numbers.
Table 1. Heat Pump Thermostat/Subbase Combinations.
Fig.
No.
Changeover
OS No.
Contains
T874G2004 Y507J1011 T874G1055
Q674L1892 Q674L1041
Replaces Honeywell
Replaces Carrier
Mode
Y594G1666
7
6
5
4
99TZ90041106 HH07AT171
HH93AZ175
Manual
changeover in
cooling
Y594G1674
Y594J1001
Y594J1019
T874G2004 Y507J1003 T874G1055
99TZ90040106 HH07AT171
HH93AZ173
Auto
changeover in
cooling
Q674J1274
Q674J1035
T874J1069
Q674L1900
—
—
T874J1002
Q674L1074 or
Q674L1637
—
—
HH07AT175
Manual
HH93AZ186 or changeover in
HH93AZ195
cooling
T874J1069
Q674J1282
T874J1002
Q674J1068 or
Q674J1159
HH07AT175
Auto
HH93AZ183 or changeover in
HH93AZ196 heating
Thermostat Ratings
SWITCHING: sealed mercury switch.
SWITCH RATINGS:
First Stage Heating and Cooling: 6.5A inrush, 1.5A
maximum running at 25 Vac.
Second Stage Heating and Cooling: 1.5A maximum
running at 30 Vac.
Changeover Switch: 6.5A inrush, 1.5A running at 25
Vac.
OPERATION
The two stages of heat are energized sequentially with
changes in temperature. Stage one comes on first; then if
the temperature at the thermostat continues to move away
from the setpoint, the second stage comes on. The
thermostat is set with about 2°F (1°C) between stages. As
the heating equipment runs and the temperature begins to
move back toward the set point, stage 2 goes off first, then
stage one.
HEAT ANTICIPATOR:
First Stage Heating and Cooling: fixed voltage type,
1.0A.
Second Stage Heating: adjustable, 0.10 to 1.2A; other
models, fixed voltage type, 1.0A.
TEMPERATURE SETTING RANGE: 42°F to 88°F (6°C to
31°C).
Subbases include an LED (light emitting diode) indicator.
This indicator lights to show that the heat pump cannot
operate and the supplemental heat stage is providing all
heating. This condition can occur in two instances; when
the subbase system switch is set at SUPL. HT. and when
the heat pump compressor has malfunctioned.
The LEDs are not field replaceable.
Copyright © 1995 Honeywell Inc. •
•
All Rights Reserved
69-0920
Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
VERTICAL
OUTLET
BOX
MOUNTING
SCREWS (2)
ᕥ
ᕦ
Note the tabs along the top inside edge of the
thermostat base. The tabs fit into the subbase
notches. Mount the thermostat on the subbase and
tighten the captive mounting screws. See Fig. 1. Do
not overtighten captive mounting screws. This can
damage the threads in the subbase.
Place the upper edge of the thermostat cover on the
base and swing cover downward until it engages
retaining posts on base. Tighten the locking cover
screws if assembly is provided.
1
COVER
PLATE
ADAPTER
2
RING
2
1
HORIZONTAL
OUTLET
BOX
SETTING
Setting the 2nd Stage (Y594G1666 and
Y594G1674 Only) Heat Anticipator
Set the adjustable heat anticipator to match its primary control
current draw. If the primary control nameplate has no rating or
if further adjustment is necessary, use the following procedure
to measure the current draw of each stage:
THERMOSTAT
L
O
O
THERMOSTAT
COVER
C
0
8
0
7
0
6
0
5
ᕡ
Remove thermostat from the subbase. Make sure
the power is on.
0
SUBBASE
8
0
7
0
6
0
5
T
A
E
H
ᕢ
Connect an ac ammeter of appropriate range
between the heating terminals of the subbase:
Stage 2: between W2 and R.
SUBBASE
MOUNTING SCREWS (2)
ᕣ
ᕤ
Move the system switch to HEAT or ON.
After one minute, read the ammeter and record the
reading.
Remount the thermostat and use a ballpoint pen to
set the adjustable heat anticipator(s) to match the
reading(s) measured in step 4. See Fig. 8.
50 60 70 80
CAPTIVE
MOUNTING SCREWS (2)
1
2
NOT INCLUDED WITH UNIT.
ᕥ
ACCESSORY PARTS AVAILABLE (193121A).
M6009
Fig. 1. Installation of subbases and thermostat on
outlet box.
Temperature Setting
Move the heating and cooling levers to the desired
positions. The minimum differential between heating and
cooling setpoints is 3°F (2°C). Some thermostat models
have nonadjustable lever stops, which set the maximum
heating control point at 68°F or 72°F (20°C or 22°C) and
the minimum cooling control point at 78°F (26°C). Do not
attempt to exceed these limits. Some models have only
one lever for heating and cooling.
TOP
MOUNTING
HOLES (2)
THERMOSTAT
CABLE OPENING
WIRING
TERMINAL
SPIRIT LEVEL
Subbase Setting
Available subbase system switch positions vary by
thermostat model. Positions control thermostat operation
as follows:
OFF: Heating and cooling systems are off. If the fan
switch is at the AUTO position, the fan is also off.
HEAT: Heating system is controlled by the thermostat.
Cooling system is off.
COOL: Cooling system is controlled by the thermostat.
Heating system is off.
POST (2) FOR
MOUNTING
THERMOSTAT
TO SPRING FINGER
CONTACTS ON THE
THERMOSTAT
MOUNTING
HOLES (2)
(UP TO 12)
M927
ON: Thermostat automatically switches between heat
and cool modes, depending on the indoor tempera-
ture.
Fig. 2. Leveling the subbase.
SUPL. HT.: Supplemental heat is energized. Cooling
system is off. Compressor cannot operate.
FOR STRAIGHT
INSERTION–
STRIP 5/16 in. (8 mm)
FOR WRAPAROUND–
STRIP 7/16 in. (11 mm)
Fan switching positions control fan operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates with heat pump and supplemental
heat as controlled by the thermostat.
BARRIER
SUBBASE TERMINAL SCREW
M928
Fig. 3. Wiring connections.
69-0920
3
Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
ON
R
FAN
G
AUTO
CO
10
8
12
C1
Y
11
9
OFF
ON
O
CO STAGE
SUPL.
HEAT
P
SUPL. HEAT
ON
E
L
H1
3
2
C
4
H2
6
W2
X
5
ON
SUPL. HEAT
FIELD WIRING CONNECTION
DENOTES CONNECTION POINT BETWEEN SUBBASE AND THERMOSTAT
SYSTEM COMPONENTS
THERMOSTAT
SUBBASE
L1
L2
(HOT)
1
R
FAN
SWITCH
FALL
COMPRESSOR CONTACTOR
Y
H1
AUTO
ON
2
3
G
FAN RELAY
W2
HEAT RELAY 1
H1 ANTICIPATOR
H2 ANTICIPATOR
OUTDOOR
THERMOSTAT
4
5
SUPL. HT.
LED (RED)
L
HEAT RELAY
CONTACT 1
HEAT RELAY 2
H2
FALL
C
E
6
8
HEAT RELAY
CONTACT 2
HEAT RELAY 3
"X" RELAY
RISE
9
SYSTEM
SWITCH
X
P
CO
C1 ANTICIPATOR
10
"P" RELAY
SUPL. HT.
ON
COOL CHANGEOVER
VALVE
OFF
RISE
CO
C1
11
12
O
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M4563
Fig. 4. Y594J1019 Thermostat/Subbase switching and internal connections.
69-0920
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Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
ON
R
FAN
G
AUTO
C0
8
10
12
C1
Y
COOL
9
COOL
O
P
OFF
11
C0 STAGE
HEAT
SUPL.
HEAT
SUPL. HEAT
E
L
HEAT
3
H1
2
HEAT
4
C
6
H2
5
W2
X
HEAT
SUPL. HEAT
FIELD WIRING CONNECTION
DENOTES CONNECTION POINT BETWEEN SUBBASE AND THERMOSTAT
SYSTEM COMPONENTS
THERMOSTAT
SUBBASE
L1
L2
(HOT)
1
R
FALL
FAN
SWITCH
COMPRESSOR CONTACTOR
H1
Y
2
3
AUTO
ON
G
H1
FAN RELAY
HEAT RELAY 1
2
ANTICIPATOR
W2
4
H2
OUTDOOR
THERMOSTAT
ANTICIPATOR
SUPL. HT.
LED (RED)
FALL
5
L
H2
6
8
HEAT RELAY
CONTACT 1
HEAT RELAY 2
HEAT RELAY 3
SYSTEM
SWITCH
C
HEAT RELAY
CONTACT 2
RISE
SUPL. HT.
9
E
X
C1 ANTICIPATOR
HEAT
CO
10
OFF
"X" RELAY
COOL
"P" RELAY
P
RISE
CO
C1
11
12
O
COOL
CHANGEOVER VALVE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
M4564
Fig. 5. Y594J1001 Thermostat/Subbase switching and internal connections.
69-0920
5
Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
ON
FAN
R
G
AUTO
C1
8
Y
9
1
OFF
ON
10
CO
SUPL. HEAT
O
ON
H1
H2
4
2
ON
E
SUPL. HEAT
6
W2
C
L
SUPL. HEAT
FIELD WIRING CONNECTION
SUPL. HEAT
DENOTES CONNECTION POINT BETWEEN SUBBASE AND THERMOSTAT
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
COOL CHANGEOVER VALVE
1
L1
O
1
(HOT)
H1 ANTICIPATOR
L2
FAN
SWITCH
AUTO
ON
G
R
2
FAN RELAY
H1
OUTDOOR
THERMOSTAT
FALL
H2
W
4
6
2
EM. HT. RELAY 1
EM. HT. RELAY EM. HT. RELAY 2
CONTACT 1
H2 ANTICIPATOR
FALL
SYSTEM
SWITCH
E
EM. HT. RELAY
CONTACT 2
EM.HT.
RELAY 3
2
8
9
CO
L
C1 ANTICIPATOR
SUPL. HT.
ON
RISE
SUPL. HT.
LED (RED)
C
Y
COMPRESSOR
CONTACTOR 1
OFF
C1
10
RISE
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
N.O. SWITCH – INSTALLER ADDED, TO LIGHT EM. HT. LED
WHEN COMPRESSOR OPERATION IS NOT NORMAL.
M4565
Fig. 6. Y594G1674 Thermostat/Subbase switching and internal connections.
69-0920
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Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
ON
R
FAN
G
AUTO
C1
8
Y
9
10
CO
COOL
OFF
HEAT
SUPL. HEAT
O
HEAT
H1
H2
4
1
2
HEAT
E
SUPL. HEAT
6
W2
C
L
SUPL. HEAT
FIELD WIRING CONNECTION
DENOTES CONNECTION POINT BETWEEN SUBBASE AND THERMOSTAT
SUPL. HEAT
THERMOSTAT
SUBBASE
SYSTEM COMPONENTS
COOL CHANGEOVER VALVE
O
1
L1
1
2
(HOT)
H1 ANTICIPATOR
L2
FAN
SWITCH
AUTO
ON
G
R
FAN RELAY
H1
OUTDOOR
THERMOSTAT
FALL
H2
W
4
6
2
HEAT RELAY 1
HEAT RELAY 2
HEAT RELAY
CONTACT 1
H2 ANTICIPATOR
FALL
SYSTEM
SWITCH
E
HEAT RELAY
CONTACT 2
HEAT RELAY 3
2
8
9
SUPL. HT.
HEAT
COMPRESSOR
FAULT
L
CO
SUPL. HT.
LED (RED)
OFF
C1 ANTICIPATOR
RISE
C
Y
10
COMPRESSOR
CONTACTOR 1
COOL
RISE
C1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
N.O. SWITCH – INSTALLER ADDED, TO LIGHT EM. HT. LED
WHEN COMPRESSOR OPERATION IS NOT NORMAL.
M4566
Fig. 7. Y594G1666 Thermostat/Subbase switching and internal connections.
69-0920
7
Y594 (MULTISTAGE THERMOSTAT SUBBASE) PACKAGE
LED Indication
Set system switch on subbase at SUPL. HT. The SUPL.
HT. LED should light. Simulate compressor failure and
energize the system. The FAULT LED should light.
CALIBRATION
Thermostat
These thermostats are accurately calibrated at the factory.
They do not have provision for field calibration.
1.2.8
STAGE TWO
ANTICIPATOR
HEATING CONTROL
MOVE INDICATOR TO
MATCH CURRENT RATING
OF PRIMARY CONTROL
Thermometer
The thermometer in your thermostat has been accurately
calibrated at the factory. The thermometer should only
adjustment if it has been dropped or shifted due to
mishandling.
M4550
Fig. 8. Adjustable heat anticipator shown.
To switch positions, use thumb and index finger to slide
lever to desired position. Switch lever must stop in detent
directly over the desired function indicator mark for proper
system operation.
If the setpoint lever and the thermometer reading do not
agree, use the following procedure:
ᕡ
Remove the thermostat cover by pulling up from the
bottom edge of the cover away from the base until it
snaps free of the cover clip.
CHECKOUT
Heating
ᕢ
ᕣ
Set the thermostat cover on a table near an
accurate thermometer.
Allow ten minutes for cover thermometer to sense
area temperature; compare the readings. Be careful
not the touch the thermometer or breathe on it.
If the readings are the same, replace cover and put
the system into operation.
If the readings are different, insert a small screw-
driver in the thermometer slot and turn it until the
thermometers have the same reading. See Fig. 9.
Replace thermostat cover and put the system into
operation.
Set the system switch on the subbase at HEAT or ON and
the fan switch at AUTO. Move the heating lever on the
thermostat about 10°F (6°C) above room temperature.
Heating (both stages if two-stage thermostat) should start
if there is no time delay or outdoor temperature limiting
system, and the fan should come on. Move the heating
lever about 10°F (6°C) below room temperature. Heating
and fan should shut off.
ᕤ
ᕥ
ᕦ
Cooling
CAUTION
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to manufacturer recom-
mendations.
Set the system switch on the subbase to COOL or ON and
the fan switch to AUTO. Move the cooling lever on the
thermostat about 10°F (6°C) below room temperature.
Cooling and fan should start. Move the cooling lever about
10°F (6°C) above room temperature. Cooling and fan
should stop.
Fan
Set the fan switch to ON. Move the system switch to
different positions; the fan should run continuously. Move
the fan switch to AUTO. Move the system switch to
different positions. Fan operation is controlled with the
heating or cooling system.
M5070
Fig. 9. Thermometer calibration.
Home and Building Control
Honeywell International, Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
J.H. 5-95
69-0920
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