50M58-289 - Emerson Climate Technologies

50M58-289 - Emerson Climate Technologies
50M58-289
2-Stage, X-13 Style Hot Surface Ignition Control
INSTALLATION INSTRUCTIONS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 50M58-289 is a replacement control for two-stage automatic
gas ignition controls employing a microprocessor to continually
monitor, analyze, and control the proper operation of the gas
burner and inducer. The 50M58-289 controls a multiple tapped
induction circulation blower.
Signals interpreted during continual surveillance of the twostage thermostat and flame sensing element initiate automatic
ignition of the burner, sensing of the flame, and system shutoff
during normal operation.
The control incorporates system fault analysis for quick gas
flow shutoff, coupled with automatic ignition retry upon sensing
a fault correction.
PRECAUTIONS
Installation should be done by a qualified heating and air
conditioning contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
Following installation or replacement, follow manufacturer's
recommended installation/service instructions to ensure proper
operation.
! CAUTION
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
!
WARNING
Failure to comply with the following warnings could
result in personal injury or property damage.
FIRE HAZARD
• Do not exceed the specified voltage.
• Protect the control from direct contact with water
(dripping, spraying, rain, etc.)
• If the control has been in direct contact with water,
replace the control.
• Label all wired before disconnection when servicing
controls. Wiring error can cause improper and
dangerous operation.
• Route and secure wiring away from flame.
SHOCK HAZARD
• Disconnect electric power before servicing.
• Ensure proper earth grounding of appliance.
• Ensure proper connection of line neutral and line
hot wires.
EXPLOSION HAZARD
• Shut off main gas to appliance until installation is
complete.
CONTENTS
Description.............................................................. 1
Precautions............................................................. 1
Specifications.......................................................... 2
Installation............................................................... 3
Mounting & Wiring
Operation................................................................. 6
System Lockout and Diagnostic Features............... 7
Troubleshooting....................................................... 8
www.white-rodgers.com
www.emersonclimate.com
PART NO. 37-7547B
Replaces 37-7547A
1445
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77 OF (25 OC)]:
Input Voltage: 120 VAC, 60 Hz (Class II transformer required)
Max. Input Current @ 24 VAC: 800mA + MV
Relay Load Ratings:
1st Stage Gas Valve Relay: 1.5 amps @ 24 VAC, 60 Hz
2nd Stage Gas Valve Relay: 0.5 amps @ 24 VAC, 60 Hz
Ignitor: 2.0 amps @ 132 VAC, 60 Hz
Inducer Relays: 2.2 FLA - 3.5 LRA @ 120 VAC
Humidifier Load: 1.0 A max @ 120 VAC
Electronic Air Cleaner Load: 1.0 A max @ 120 VAC
Circulator Output : 12 mA RMS @ 30 VAC
Flame Current Requirements:
Minimum current to ensure flame detection: 0.3 µa DC*
OPERATING TEMPERATURE RANGE:
-40° to 175°F (-40° to 80°C)
HUMIDITY RANGE:
5% to 93% relative humidity (non-condensing)
Timing Specs: (@ 60 Hz**)
maximum
Flame Failure Response Time:
2.0 sec
Gases Approved: Natural, Manufactured, Mixed, Liquid Petroleum, and LP Gas Air Mixtures are all approved for use.
50M58-289 TIMING TABLE
(All times are in seconds, unless noted otherwise)
Event
Definition
Time
Pre-purge Time
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the beginning of a furnace
operating cycle prior to initiating ignition
15
Igniter Warm-up Time
The length of time allowed for the igniter to heat up prior to the initiation
of gas flow.
17
Trial for Ignition Period (TFI)
The period of time between initiation of gas flow and the action to
shut off the gas flow in the event of failure to establish proof of the
supervised ignition source or the supervised main burner flame.
4
Ignition Activation Period (IAP)
The period of time between energizing the main gas valve and
deactivation of the ignition means prior to the end of TFI
3
Retries
The additional attempts within the same thermostat cycle for ignition
when the supervised main burner flame is not proven within the first
trial for ignition period.
Valve Sequence period
Valve sequence period equals 5 seconds trial for ignition period x
(1 initial try + 2 retries) + 12 seconds.
15
Inter-purge
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion between the failed trial for
ignition and the retry period.
30
Post-purge Time
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the end of a furnace burner
operating cycle. Post-purge begins at the loss of flame sense.
15
Lock-Out Time
ANSI standard rated module timing.
300
Heat Delay-To-Fan-On
The period of time between proof of the supervised main burner flame
and the activation of the blower motor at Heat speed.
30
Heat Delay-To-Fan-Off*
The period of time between the loss of a call for heat and the
deactivation of the blower motor at Heat speed.
90/120/150/180
Cool Delay-To-Fan-On
The period of time after a thermostat demand for cool before
energizing the circulator blower motor at Cool speed.
5
Cool Delay-To-Fan-Off
The period of time between the loss of a call for cool and the
deactivation of the blower motor at Cool speed.
45
Automatic Reset Time
After one (1) hour of internal or external lockout, the control will
automatically reset itself and go into an auto restart purge for 60
seconds.
*These times will vary depending on option switch position.
2
2 times
60 minutes
INSTALLATION
MOUNTING AND WIRING
Refer to Typical System Wiring Diagram on page 4 and
Typical System Wiring Table on page 5
All wiring should be installed according to local and national
electrical codes and ordinances.
The control must be secured to an area that will experience a
minimum of vibration and remain below the maximum ambient
temperature rating of 175oF. The control is approved for minimum
ambient temperatures of -40oF.
When mounting the control, any orientation is acceptable.
Choose a location that will not damage, obstruct or place stress
on the control terminations, system wiring harness or system
components.
Refer to the wiring diagram and wiring table when connecting
the 50M58 control to other components of the system.
UL approved, 105oC rated 18 gauge min., stranded, 1/32" thick
insulation wire is recommended for all low voltage safety circuit
connections.
After installation or replacement, follow appliance manufacturer's
recommended installation or service instructions to insure
proper operation.
The 50M58 has only one serviceable part – an automotive type
fuse, which protects the low voltage transformer from damage
if its output is short-circuited. If the fuse has opened up, correct
whatever caused the short circuit and replace the fuse with only
a 3 amp automotive type fuse. If the fuse is not the cause of
the control's problem, replace the entire 50M58 control. There
are no other user serviceable parts.
Additional jumper wires are included to be used if the original
wiring does not reach the control after mounting. Refer to the
furnace wiring diagram for proper connection of wires.
Some applications will require connection to terminal FP2. If
the control being replaced does not have this connections, it is
not needed in the application and connection to terminal FP2
is not required.
UL approved, 105oC rated 16 gauge min., stranded, 1/16"
thick insulation wire is recommended for all line voltage
connections. 3
WIRING
50M58-289TYPICALWIRINGDIAGRAM
HOT
(LINE)
NEUTRAL
(LINE)
120 VAC
24VACCLASSII
TRANSFORMER
TH
24VAC
TR
50M58-289
T1
T2
T3
T4
CIRCULATOR
BLOWER
LINE
XFMR
EAC
HUM
INDUCER
HUMIDIFIER
(OPTIONAL)
IGNITOR
CIRC N
LINEN
XFMR N
HUMN
EAC N
ELECTRONIC
AIRCLEANER
(OPTIONAL)
THERMOSTAT
IGN
INDHI
INDLO
INDN
IGNN
R
R
G
G
W2
W2
W1
W1
Y2
Y
50M58-289
in other
furnace
Twin
Application
Only
CONDENSING
UNITS
TWIN
C
HLO
HLI
FP
PS1
MVL
MVH
GND
GND
PS2
MV COM
TR
TH
FLAME
SENSOR
PROBE
4
FP2(E33)
HIGHLIMIT ROLLOUT
(N.C.) SWITCH(N.C.)
1STSTAGEPRESSURE
SWITCH(N.O.)
AUX.HIGH
LIMIT(N.C.)
GAS
VALVE
2NDSTAGEPRESSURE
SWITCH(N.O.)
LEGEND
LowVoltage(24VAC)
LineVoltage(120VAC)
N.C.=Normallyclosedswitch
N.O.=Normallyopenswitch
WIRING
50M58-289TYPICALWIRINGTABLE
50M58-289
TERMINAL
TERMINAL
TYPE
SYSTEMCOMPONENT
CONNECTION
W1
two-stage thermostat W1 terminal (or equivalent)
W2
two-stage thermostat W2 terminal (or equivalent)
G
two-stage thermostat G terminal (or equivalent)
7 -screw
terminal
block
R
C
two-stage thermostat R terminal (or equivalent)
two-stage thermostat C terminal (or equivalent)
Y
YLO
TWIN
two-stage thermostat Y terminal (or equivalent)
two-stage thermostat YLO terminal
one wire twinning terminal*
MVH (1)
PS2 (2)
FP (3)
GND (4)
TH (5)
HLI (6)
MVL (7)
MV COM (8)
TR (9)
GND (10)
HLO (11)
PS1 (12)
gas valve SECOND STAGE
2nd stage pressure switch INPUT
flame sensor probe**
MUST BE RELIABLY GROUNDED TO CHASSIS
24 VAC transformer (low voltage HIGH SIDE)
high limit INPUT
gas valve FIRST STAGE
gas valve COMMON
24 VAC transformer (low voltage COMMON SIDE)
MUST BE RELIABLY GROUNDED TO CHASSIS
high limit OUTPUT
1st stage pressure switch INPUT
IGN (1)
IND HI (2)
IND LO (3)
IND N (4)
IGN N (5)
COM
IGN
1/4"
FP
PS2
MVH
HLI
TH
GND
TR
MV
COM
MVL
PS1
HLO
GND
IND
HI
IND
LO
IND
N
IGN
N
ignitor HOT side
inducer HIGH SPEED HOT side
inducer LOW SPEED HOT side
inducer NEUTRAL side
ignitor NEUTRAL side
female spade terminal X-13 motor low voltage return
T1
1/4"
spade terminal
circulator blower terminal (TAP 1)
T2
1/4"
spade terminal
circulator blower terminal (TAP 2)
T3
1/4"
spade terminal
circulator blower terminal (TAP 3)
T4
1/4"
spade terminal
circulator blower terminal (TAP 4)
CIRC-H
1/4"
spade terminal
circulator blower HOT SIDE
L1
1/4"
spade terminal
input voltage (120 VAC) HOT SIDE
XFMR
1/4"
spade terminal
24 VAC transformer line voltage HOT SIDE
EAC-H
1/4"
spade terminal
air cleaner HOT side
HUM
1/4"
spade terminal
humidifier HOT side
CIRC N
1/4"
spade terminal
circulator blower NEUTRAL terminal
LINE N
1/4"
spade terminal
input voltage (120 VAC) NEUTRAL SIDE
XFMR N
1/4"
spade terminal
24 VAC transformer line voltage NEUTRAL SIDE
HUM N
1/4"
spade terminal
humidifier NEUTRAL side
EAC N
1/4"
spade terminal
air cleaner NEUTRAL side
* For TWINNING applications, use only 50M51-843 Controls
** Maximum recommended flame probe wire length is 36 inches.
5
OPERATION
OPTION SWITCHES
Option switches on the 50M58-289 control are used to determine
the length of the delay-to-fan-off periods. The following tables
show the time periods that will result from the various switch
positions.
OPTIONSWITCHESS1-3&S1-4POSITIONS
On “S1,”
set switch #:
3
4
Off
Off
Off
On
On
Off
On
On
HEATdelayto-fan-off:
90 sec.*
120 sec.
150 sec.
180 sec.
When using a single stage thermostat, second stage delay is
based on the setting of switch S1-1, S1-2 shown below.
OPTION SWITCHES S1-1 & S1-2 POSITIONS – COOL CIRCULATOR SPEED
2nd Stage delay for single stage thermostats
On "S1" set switch #
1
Off
On
Off
On
Off
10 min.
Auto min.
20 min.
2
Off
Off
On
On
Equals
0
38
50
62
75
88
or less than
38
50
62
75
88
100
Low to High
Stage Delay
Demand
12 minutes
10 minutes
7 minutes
5 minutes
3 minutes
1 minute
Light
Light to Average
Average
Average to Heavy
Heavy Light
Heavy
When the second stage of the thermostat is satisfied, the inducer
motor is reduced to low speed and the second stage gas valve
is de-energized.
OPTION SWITCH S2 POSITION
DIP SWITCH S2 SETTING
S2
*1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
Position OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF OFF OFF ON OFF ON ON ON OFF ON ON ON ON
SPEED TAP
G
T1
T1
T1
T1
T1
T1
T1
W1
T1
T1
T1
T1
T1
T1
T1
W2
T2
T2
T2
T2
T2
T2
T2
Ylo
T4 (60hz)
T3
T3
T4 (60hz) T4 (60hz)
T3
T2
Y
T4 (120hz) T4 (60hz) T4 (120hz)
T1
T2
T4 (120hz) T4 (120hz)
*Factory default setting
T1
T1
T2
T2
T3
OPTION SWITCH S3 POSITION – HEAT CIRCULATOR SPEED
DIP Switch S3 Setting
S3
*1 2
1 2
1 2
1 2
Position
OFF OFF
ON OFF
ON ON
OFF ON
G
W1
W2
T1
T1
T2
T1
T3
T2
T1
T3
T4(60Hz)
T1
T4(60Hz)
T4(120Hz)
*Factory default settings
HEAT MODE
In a typical system, a call for first stage heat is initiated by closing
the W1 thermostat contacts. The inducer blower is energized
at high speed and the control waits for the low pressure switch
contacts to close. The humidifier (optional) is also energized at
this time. Once the low pressure switch contacts close, a prepurge is initiated. Then the inducer changes to low speed and
the 120V ignitor is powered.
At the end of the ignitor warm-up time, the first stage of the two
stage manifold gas valve is energized (low fire). Once flame
is detected, the HEAT delay-to-fan-on period begins. After the
delay-to-fan-on period ends, the 50M58 control will energize
the circulator fan at low heat speed. The electronic air cleaner
(optional) will also energize at this time.
For a two-stage thermostat, a call for second stage heat (W1
and W2) after a call for first stage heat will energize the inducer
at high speed and the circulator at high heat speed. The second
6
Average Calculated
Duty Cycle %
Once the specified delay time has expired the second stage
valve will be energized.
*Factory default setting– two stage thermostat
SPEED TAP
For a single-stage thermostat, when a call for heat occurs
(W1), a 10, 20 minute or auto mode heat staging timer will be
activated (timing is selectable with option switches S1-1 and
S1-2 positions). Following this delay, the second stage heat is
energized as above.
The AUTO model algorithm is a method of energizing the second
stage gas valve based on the recent average of the heating duty
cycle. During a typical heating day, the low to high stage delay
is determined by using the average calculated duty cycle from
the table below.
*Factory default setting
Delay Time:
stage pressure switch contacts will close and energize the second
stage gas valve (high fire).
On the 50M58 control, the circulator will remain at high heat
speed for 30 seconds following the opening of the second stage
gas valve and then is reduced to low heat speed.
When the first stage of the thermostat is satisfied, the first stage
gas valve is de-energized and the HEAT delay-to-fan-off begins
timing. The inducer will postpurge for an additional 15 seconds,
then the inducer and humidifier will turn off. Upon completion
of the HEAT delay-to-fan-off period, the 50M58 circulator is
turned off. The electronic air cleaner on the control is also deenergized at this time.
If flame is not detected during the trial-for-ignition period or if the
flame is detected/sensed and then lost before completion of 10
seconds of establishment, the gas valve is de-energized, the
ignitor is turned off, and the control goes into the “retry” sequence.
The “retry” sequence provides a 60-second wait with the inducer
interpurge following an unsuccessful ignition attempt (flame not
detected). After this wait, the ignition attempt is restarted. Two
retries will be attempted before the control goes into system
lockout.
If flame is established for more than 10 seconds after ignition,
the 50M58 controller will clear the ignition attempt (or retry)
counter. If flame is lost after 10 seconds, the control will restart
the ignition sequence.
A momentary loss of gas supply, flame blowout, or a shorted or
open condition in the flame probe circuit will be sensed within
2.0 seconds. The gas valve will de-energize and the control will
restart the ignition sequence. Recycles will begin and the burner
will operate normally if the gas supply returns, or the fault condition is corrected, before the last ignition attempt. Otherwise, the
control will go into system lockout.
If the control has gone into system lockout, it may be possible
to reset the control by a momentary power interruption of
10 seconds or longer. Refer to SYSTEM LOCKOUT AND
DIAGNOSTIC FEATURES.
OPERATION
MANUAL FAN ON MODE
COOL MODE
In a typical system, a call for cool is initiated by closing the thermostat contacts Y or YLO and G. The circulator motor speed is
selected by Dip Switch S2 (refer to option switch S2 positions
table on page 6) for the thermostat input that is energized. Once
the control receives a call for cool, a 5 second cool on delay
time is activated. This allows the compressor to energize prior
to the indoor circulator being energized. After the thermostat is
satisfied, the compressor is de-energized and the control starts
a 45 second circulator off delay. After the cool off delay period
expired the indoor circulator is de-energized.
If a call for cool (YLO or Y) is received without a G input the
control will energize the indoor circulator motor as per DIP
switch 2 setting but will display an Amber 4 flash to alert that
the thermostat G input is not present.
If the thermostat fan switch is moved to the ON position, the
circulator fan (low heat speed) and the electronic air cleaner
(optional) are energized. When the fan switch is returned to
the AUTO position, the circulator and electronic air cleaner are
de-energized.
TWINNING INTERFACE
The 50M58 is equipped with a single wire twinning interface.
If twinning is used, either control will process a call for heat,
cool or fan as described previously. However, after the heat- or
cool-on delay time expires, both units will energize the circulator
blowers at the same time. Likewise, after the heat- or cool-off
delay time expires, both units will de-energize the circulator at
the same time. This allows for the proper air flow to be obtained.
In a twinned application, the controls are able to communicate
no matter how the transformers are phased.
To enable twinning, connect the TWIN screw terminals on the
50M58 controls of the furnaces to be twinned to each other
using a single wire (14-22 AWG).
SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES
SYSTEM LOCKOUT
FAULT CODE RESET
When system lockout occurs, the gas valve is de-energized and
the low speed inducer blower and the low heat speed circulator are energized. The electronic air cleaner (optional) will also
energize at this time. The diagnostic indicator light will flash to
indicate the system status.
To clear the fault code memory, push and hold the "LAST ERROR" button for more than 5 seconds and less than 10 seconds.
(Control will indicate this period by RAPID GREEN FLASH for 5
seconds to 10 seconds.) The LED will flash three green flashes
when the memory has been cleared.
To reset the control after system lockout, do one of the
following:
1. Interrupt the call for heat at the thermostat for at least one
second but less than 20 seconds (if flame is sensed with
the gas valve de-energized, interrupting the call for heat at
the thermostat will not reset the control).
2. Interrupt the 24 VAC power at the control for at least 20
seconds.You may also need to reset the flame rollout sensor
switch.
3. After one hour in lockout, the control will automatically reset
itself.
LAST FAULT MODE
To retrieve fault codes, push and release the "LAST ERROR"
button for more than 1/5 second and less than 5 seconds. (Control
will indicate this period by solid GREEN for 1/5 to 5 seconds).
The LED will flash up to five stored fault codes, beginning with
the most recent. If there are no fault codes in memory, the LED
will flash two green flashes. The control will flash the most recent error first and the oldest error last (last in first out). There
shall be 2 seconds between codes. Solid LED error codes will
not be displayed.
DIAGNOSTIC FEATURES
The 50M58 control continuously monitors its own operation and
the operation of the system. If a failure occurs, the red LED on the
control will flash a failure code. If the failure is internal to the
control, the light will stay on. In this case, the entire control
should be replaced, as the control is not field-repairable.
If the sensed failure is in the system (external to control), the
LED will flash in the following flash-pause sequences to indicate
failure status (each flash will last approximately 0.25 seconds,
and each pause will last approximately 2 seconds.)
During a second-stage error condition, the red LED when in
lockout will flash groups of double pulses. The red LED will flash
on for approximately 1/15 second then off for 1/15 second then
on for 1/15 second, then off for 3/10 second. The pause between
groups of flashes is approximately 2 seconds.
The diagnostics will indicate the specific fault through the
following codes:
7
TROUBLESHOOTING
DIAGNOSTIC TABLE
Green Amber Red LED
Error/Condition
LED
LED
Flash
Flash Flash
1
Flame sensed when no flame should
be present
2
3
4
5
6
Pressure switch stuck closed/ inducer
error
1st-stage pressure switch stuck
open/inducer error
Open limit switch
Open rollout/open fuse detect
1st-stage pressure switch cycle
lockout
7
External lockout (retries)
8
External lockout (ignition recycles
exceeded where flame is established
and then lost)
Grounding or Reversed polarity
9
10
11
12
Solid
Rapid
3
double
1
2
3
4
Rapid
1
Solid
Rapid
1
2
Module gas valve contacts energized
with no call for heat
Limit switch open – possible blower
failure overheating limit
Module Ignitor contact failure
Module - internal fault condition
Comments/Troubleshooting
Verify the gas valve is operating and shutting down properly. Flame in
burner assemble should extinguish promptly at the end of the cycle.
Check orifices and gas pressure.
Pressure switch stuck closed. Check switch function, verify inducer is
turning off.
Check pressure switch function and tubing. Verify inducer is turning on
the pulling sufficient vacuum to engage switch.
Verify continuity through rollout switch circuit.
Verify continuity through rollout switch circuit, check fuse.
if the first stage pressure switch cycles 5 times (open, closed) during
one call for heat from the thermostat the control will lockout. Check
pressure switch for fluttering, inconsistent closure or poor vacuum
pressure.
Failure to sense flame is often caused by carbon deposits on the
flame sensor, a disconnected or shorted flame sensor lead or a poorly
grounded furnace. Carbon deposits can be cleaned with emery cloth.
Verify sensor is not contacting the burner and is located in a good
position to sense flame. Check sensor lead for shorting and verify
furnace is grounded properly.
Check items for exceeded retries listed above and verify valve is not
dropping out allowing flame to be established and then lost.
Verify the control and furnace are properly grounded. Check and
reverse polarity (primary) if incorrect.
Verify valve is not receiving voltage from a short. If a valve wiring is
correct and condition persists, replace module.
Possible blower failure, restricted air flow through appliance or
duct work. Verify continuity through limit switch circuit and correct
overheating cause.
Fault code indicates the module ignitor contacts are not functioning
properly. Replace module.
Module contacts for gas valve not operating or processor fault. Reset
control. if condition persists replace module.
Check wire connections. If condition persists, replace module.
Check pressure switch function and tubing. Verify inducer is turning on
and pulling sufficient vacuum to engage switch.
Normal operation - first stage
Twinning error
2nd-stage Pressure Switch Stuck
Open/Inducer Error
Normal Operation with call for first
stage heat
Normal Operation with call for second Normal operation - first stage
stage heat
W2 present with no W1
Second stage call for heat on thermostat circuit with no call for first
stage. Verify dip switches are set for two stage thermostat and check
thermostat first stage circuit. Configured for a multi-stage thermostat
the Module will not initiate heating unless first stage call from
thermostat is received.
Y present with no G call
Module will allow cooling to operate with only a "Y signal from the
thermostat but will also trigger this code. Verify thermostat is energizing
both "Y" and "G" on call for cool. Check "G" terminal connections.
Low flame sense current
Low flame sense current is often caused by carbon deposits on the
flame sensor, a poorly grounded furnace or a mis-aligned flame sense
probe. Carbon deposits can be cleaned with emery cloth. Check for
improve furnace and module ground. Verify sensor is located in or very
near flame as specified by the appliance manufacturer.
Standby or Call for Cool
Normal operation. Waiting for call from thermostat or receiving
thermostat call for cool.
Standby
Normal Operation with call for fan (G)
Normal Operation with call for Low
stage cool (YLO + G)
Normal Operation with call for
High stage cool/or single stage
cooling(YLO + G)
White-Rodgers is a business
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
www.white-rodgers.com
www.emersonclimate.com
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