Transcript No Slide Title

Rule #1
Also known as
Daryl’s words to live by.
Those really weird calls
» Once every couple of months or so we
get those really weird service calls.
» The problem never happens when
we’re there. For that matter, the
equipment always seems to be working
fine.
» What should we check first? What
could it possibly be?
» Is the unit possessed?
K eep
IT
Simple
Stupid
Start with the basics!
+ Assume nothing, check everything, no
matter how unrelated it may seem.
+ Forget everything that’s been done in the
past service calls.
+ Check low voltage connections, check
line voltage connections. Check voltages.
+ Check pressures, cycle it on the
thermostat. Cycle it on the safeties. Drop
out a motor.
Start with the basics!
± Wiggle wires, jiggle connections and look
everywhere.
± Ignore your urges, remember that the last
guy did what you’re considering and look
how productive that was.
± What are you looking for? Won’t know til’ ya
find it.
Start with the basics!
× This is probably not one where you’ll get
to use your new nuclear powered, fully
digital analog read out, voice activated
microprocessor ACME 1000 meter.
× Nope, this one will be solved with a
pressure gauge at best. Probably a
screw driver or a pair of pliers.
K eep
IT
Simple
Stupid
Heat Pump Systems
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the cooling mode, heat pumps work the same
as cooling only units. As the air is drawn across
the indoor coil, the refrigerant absorbs the heat
(energy) from it. The heat now trapped in the
refrigerant is carried outdoors by the
refrigerant. As the hot gas refrigerant
condenses, it gives off the heat from indoors.
In the heating mode of
operation, the refrigerant flow is
reversed.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
In the heating mode, the heat pump is absorbing
the heat (energy) from the air. The outdoor coil
is now acting as the evaporator coil. The indoor
coil being the condenser coil, releasing the heat
from the refrigerant to the indoor air.
Heat Pump Classification
• Heat pumps are classified by the
medium used for heating while in the
heating mode.
• Most residential units are air to air.
Meaning they use air (the outdoor air)
as their source of heat when heating.
• Another common type found in light
commercial applications, is the water
source heat pump.
Heat Pump Classification
• There is heat (energy) present to minus
480º F. Most current heat pumps can
perform efficiently to 20º F.
• The need for supplemental heat will
depend on the design condition and the
building’s construction.
• The colder the outdoor ambient, the
greater the heating demand is. With less
heat in the outdoor air, the heat pump
loses capacity.
INSIDE THE
HEAT PUMP
• COMPRESSOR CAPABLE OF OPERATING AT
LOW OUTDOOR TEMPERATURES
• INDOOR / OUTDOOR COIL DESIGN
• METERING DEVICE FOR INDOOR / OUTDOOR
COIL
• REVERSING VALVE ( 4-WAY VALVE )
• ACCUMULATOR
• CRANKCASE HEATER
• AUXILIARY HEAT
• EMERGENCY HEAT
• DEFROST CYCLE
HEAT PUMP
• ACCUMULATOR:
– CLIMATUFF Reciprocating - PART OF COMPRESSOR SHELL
– LOCATED IN SUCTION LINE BETWEEN THE
COMPRESSOR AND REVERSING VALVE
– WHY HAVE ONE?
• MOST IMPORTANT:
– HEATING CYCLE - COLD TEMPERATURES, OUT DOOR
COIL MAY NOT BE ABLE TO EVAPORATE ALL THE
REFRIGERANT
– END OF DEFROST CYCLE
– LIQUID CARRYOVER WILL BE CAUGHT BY THE
ACCUMULATOR TO PREVENT COMPRESSOR DAMAGE
From Reversing
Valve
To compressor
Vapor & liquid
refrigerant
Vapor
refrigerant
Oil return orifice
Liquid
refrigerant
WHAT MAKES A HEAT
PUMP UNIQUE
•
•
•
•
SPECIAL COMPRESSOR
MUCH HIGHER COMPRESSION RATIO
MOST SEVERE APPLICATION
HEAT PUMP COILS
– ALTERNATELY FUNCTION AS EVAPORATOR
AND CONDENSER
– MUST TOLERATE CHARGE IMBALANCE
– OUT DOOR COIL MUST BE DESIGNIED FOR
EASY DEFROST
HEAT PUMP
• CRANKCASE HEATER
– LOCATED ON COMPRESSOR, OLDER
SYSTEMS USED COMPRESSOR
WINDINGS.
– RAISES TEMPERATURE OF OIL SO
THAT THE ABSORPTION OF
REFRIGERANT INTO THE
COMPRESSOR IS KEPT TO A
MINIMUM
HEAT PUMP
THE REVERSING
VALVE CONTROLS THE
DIRECTION
THE REFRIGERANT FLOWS
COOLING CONDITION
INDOOR COIL
SAT. SUCT. T. 41F
ENT. AIR T.
76F
4-WAY
VALVE
METERING
DEVICE
SUBCOOLING
10F
SUCT. P. 70 PSIG
SUCT. T. 52F
SUPERHEAT 11F
DISCHARGE
PRESSURE
260 PSIG
OUTDOOR COIL
SAT. COND. T. 120F
ENT. AIR T.
90F
COMPRESSOR
HEATING CONDITIONS
INDOOR COIL
SAT. COND. T. 95F
ENT. AIR T.
70F
METERING
DEVICE
SUBCOOLIN
G
10F
4-WAY
VALVE
SUCT. P. 43 PSIG
SUCT. T. 35F
SUPERHEAT 10F
DISCHARGE
PRESSURE
182 PSIG
OUTDOOR COIL
SAT. SUCT. T. 20F
ENT. AIR T.
45F
COMPRESSOR
What to look at inside
• The two most important checks to perform
while inside are cycle rate and fan speed/air
flow.
• Thermostats with adjustable heat anticipation
need to have it adjusted for proper operation!
• We had to see what air handler the system is
matched up with to check our charge, to check
the blower motor speed tap will only take
another few minutes.
What to look at inside
• One of the most important steps we can do
while inside the home, is briefly review normal
heat pump operation with the consumer! (what
to expect)
• Even if the consumer has had a heat pump in
the past, reviewing things like demand defrost,
thermostat set back, and what happens in a
defrost cycle with newer equipment will make
for a happier customer.
System air flow
> The blower speed must be set for the
proper operation of the outdoor section.
> A system with operating pressures that will
not match up to those listed on the
charging chart probably has an air flow
problem.
> The more the refrigerant pressures match
up to the charging chart, the closer the air
flow is to that listed on the charging chart.
System air flow
• A system moving too much air will
have a low temperature rise and
possibly defrost problems.
• A system moving too little air will
act as a mismatched application.
Requiring refrigerant be removed
in the fall and added in the spring.
System match up
Not in your books
± System selection should always be
done with the manufacturers
equipment selection guide.
± Coil capacity and air flow are critical
in this selection.
± The outdoor coil should never
exceed the indoor coil volume by
more than a two to one ratio!
System match up
Not in your books
• The indoor coil may be smaller than
the outdoor coil due to operating
temperatures.
• The indoor temperature typically no
more than 74º and the larger outdoor
coil will hold more refrigerant
flashing off at the low outdoor
ambient temperatures.
System match up
Not in your books
× If you compare these to a system
operating in the cooling mode, some
form of head pressure control would
be needed.
× The nameplate charge on split
systems is the charge used for the
ARI test, and may not be right for the
system you’re on.
System match up
Not in your books
¬ Different match-ups will have
different capacities and these may
vary dramatically with outdoor
design conditions.
¬ Replacing only part of a system
without knowing the system
compatibility is taking a gamble!
System cycle rate
Not in your books
= A system can be properly matched up,
charged properly, the proper air flow,
and no detectable problems and still not
perform satisfactorily due to excessive
cycling.
= A system cycling excessively will not only
perform poorly, but is certain to have
premature failures.
System cycle rate
Not in your books
* The system cycle rate can be effected by
the heat anticipator setting as well
thermostat location.
* Air drafting across the thermostat will
also effect it. Air being drawn down the
wall from the attic is commonly
overlooked as well.
System cycle rate
Not in your books
$ If you suspect air flow to be effecting the
thermostat operation, cover the thermostat.
$ A shoebox and some masking tape work
very well. For an accurate test, the cover
will need to be kept in place for a couple of
cycles.
System cycle rate
Not in your books
› With some after market
programmable thermostats you
made need to set the cycle rate to
“gravity system”, for normal heat
cycling.
› This can be accomplished with the
heat cycle rate adjustment screws on
the back of the thermostat.
System cycle rate
Not in your books
µ Symptoms of excessive cycling are
unusually high utility bills, premature
compressor failure, and poor heating
performance.
µ System cycle rate is the probably the
most overlooked aspect of the
system, but as critical as any other a
technician can check.
COOL
F
O
HA
TS
C1
COOL
H1
X2
FAN
AUTO
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
HEAT PUMP
THERMOSTAT
Y
RHS-1
BAYSTAT239 OR 240
CA
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Energized In Cooling
F
COOL
Fault Indication Light
SOV Energized In Cooling
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Brings On Compressor In Both
Heating And Cooling
F
COOL
Fault Indication Light
SOV Energized In Cooling
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Energized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Energized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
Part of Heat Anticipation Circuit (Used
with Trane Electro-Mechanical T’stats
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Engerized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
Part of Heat Anticipation Circuit (Used
with Trane Electro-Mechanical T’stats
This Is The Second Stage-Brings
On The Electric Heat
Functions As An Internal Connection
For The Blue Light
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Engerized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
Part of Heat Anticipation Circuit (Used
with Trane Electro-Mechanical T’stats
This Is The Second Stage-Brings
On The Electric Heat
Functions As An Internal Connection
For The Blue Light
This Is The Common Side Of The
Transformer
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Engerized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
Part of Heat Anticipation Circuit (Used
with Trane Electro-Mechanical T’stats
This Is The Second Stage-Brings
On The Electric Heat
Functions As An Internal Connection
For The Blue Light
This Is The Common Side Of The
Transformer
This Is The Other Side Of 24 Volts
From The Transformer
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
Fault Indication Light
SOV Engerized In Cooling
Brings On Compressor In Both
Heating And Cooling
Energizes Auxiliary Heat When
Unit Is In Defrost
Brings On Indoor Fan
Part of Heat Anticipation Circuit (Used
with Trane Electro-Mechanical T’stats
This Is The Second Stage-Brings
On The Electric Heat
COOL
F
O
HA
TS
C1
COOL
H1
X2
FAN
AUTO
ON
SM-2
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
ODA
HEAT PUMP
THERMOSTAT
Y
RHS-1
BAYSTAT239 OR 240
CA
COOL
F
O
HA
CA
Y
RHS-1
TS
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
ODA
NORM
T
TSH
INDOOR UNIT
G
W
BL
B
U
W1
RD
R
B
R
RHS-2
G
COOL
F
O
HA
CA
Y
TS
RHS-1
C1
H1
COOL
X2
AUTO
FAN
G
ON
SM-2
ODA
NORM
T
TSH
INDOOR UNIT
G
W
BL
B
U
W1
RD
R
B
R
RHS-2
FAN ON - ON
BAYSTAT240A
COOLING ON
COOL
F
O
HA
CA
TS
C1
H1
COOL
X2
AUTO
FAN
G
ON
SM-2
ODA
NORM
T
TSH
W
BL
U
INDOOR UNIT
RD
G
B
B
W1
R
R
COOLING ON FAN - AUTO
RHS-2
Y
RHS-1
FAN - AUTO
OUTDOOR UNIT
BAYSTAT240A
Defrost Board
COOL
F
O
HA
CA
TS
C1
H1
COOL
Y
Y
R/W
X2
RHS-1
R
X2
O
AUTO
BL
FAN
ON
NORM
ODA
Y
SM-2
O
T
TSH
W
BL
U
INDOOR UNIT
RD
G
B
B
W1
R
R
COOLING ON FAN - AUTO
RHS-2
G
BL
COOL
HEATING - ON - FIRST STAGE
F
O
FAN - AUTO
HA
CA
Y
RHS-1
TS
C1
COOL
H1
X2
AUTO
FAN
ON
SM-2
15 TO 22 VOLTS (T)
FROM ODS-A TO (R)
ODA
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
G
BAYSTAT240A
COOL
F
O
HA
CA
TS
RHS-1
C1
H1
COOL
X2
AUTO
FAN
G
ON
SM-2
ODA
NORM
T
TSH
W
BL
INDOOR UNIT
U
RD
G
B
B
W1
R
R
RHS-2
Y
OUTDOOR UNIT
BAYSTAT240A
Defrost Board
COOL
F
O
HA
CA
O
Y
TS
C1
H1
COOL
Y
R/W
X2
RHS-1
R
X2
AUTO
BL
ON
NORM
ODA
Y
SM-2
O
T
TSH
W
BL
INDOOR UNIT
U
RD
G
B
B
W1
R
R
RHS-2
G
FAN
BL
F
FAN - AUTO
O
COOL
HEATING - ON - 2ND STAGE
HA
CA
Y
RHS-1
TS
C1
COOL
H1
X2
AUTO
FAN
ON
NORM
ODA
15 TO 22 VOLTS (T)
FROM ODS-A TO (R)
SM-2
T
TSH
W
BL
U
RD
B
R
RHS-2
G
24 VOLT S (O)
FROM DEF. BRD
COOL
F
O
HA
CA
Y
RHS-1
TS
H1
COOL
X2
AUTO
FAN
G
15 TO 22 VOLTS (T)
FROM ODS-A TO (R)
SM-2
ODA
ON
NORM
T
TSH
W
BL
U
RD
B
R
RHS-2
24 VOLT S (X2)
FROM DEF. BRD
C1
(OPERATES 1.5° BELOW
SETPOINT)
BAYSTAT240A
F
COOL
HEATING ON EMERG. HTG
O
HA
CA
TS
RHS-1
C1
H1
COOL
X2
AUTO
FAN
G
ON
SM-2
ODA
NORM
T
TSH
W
BL
INDOOR UNIT
U
RD
G
B
B
W1
R
R
RHS-2
Y
FAN - AUTO
WHAT IS COOLING DROOP?
• Cooling droop is caused by the cooling
anticipator heating up during the off cycle,
causing the t’stat to come on sooner, to help
overcome the thermal lag of the system.
• This also provides night time cooling that
helps keep humidity under control
DROOP (cont’)
• Then there is Heating Droop.
• Heating Droop moves the temperature in
the wrong direction. To compensate for this,
the “T” circuit is added.
WHAT DOES THE “T”
CIRCUIT HAVE TO DO WITH
ANYTHING?
• The “T” circuit is a heat anticipation circuit
that adds heat to the thermostat to slow
down thermostat response, and removes
heat to speed up the response.
“T” Circuit
• As the outdoor temperature drops, the
resistance in the “T”, actually a thermistor
(ODS-A), goes up.
• The higher the resistance, the less voltage is
supplied to the resistor (ODA) located
inside the thermostat.
• The less voltage to the ODA, the colder the
t’stat thinks it is.
4000
13.6 V
.047 W
2000
9.6 V
.046 W
800
5V
.031 W
300
2.2 V
.013 W
.0034 A
3000
10.4 V
.036 W
-20°F
.0048 A
3000
14.4 V
.069 W
0°F
ODS-A
ODS-A
.0063 A
ODS-A
.0073 A
ODS-A
3000
19 V
.119 W
30°F
3000
21.8 V
.159 W
70°F
DEFROST BOARD DURING DEFROST
K2
OD
230 VOLTS
R
T’STAT
R
Y
Y
RD/W
F
BR/BL
Motor
K1
BK
X2
O
O
T
B
BL
Y
COMPR
O
SOV
T
SENSORS
T
WHY IS THE BLUE LIGHT
ON?
THE BLUE LIGHT IS AN INDICATION
THAT THE AUXILIARY HEAT IS ON.
• It is on in several instances.
– If the t’stat is adjusted above set point.
– If the outdoor temperature is below 40°F it will
cycle off and on to maintain room temperature.
• If it stays on constantly above 30°F or
cycles on when the outdoor temp. is above
50°F, the system should be checked.
The auxiliary heat light is on, but the
system does not have auxiliary heat?
• TRANE heat pump thermostats, programmable
or electro-mechanical, with this display capability
(an LED) will show auxiliary heat use whenever
the room temperature is a degree and a half or
more below the thermostat set point.
• The LED is powered from the same out put from
the thermostat as the heat strips, even if there
are none.
The heat pump can handle the load,
but the customer is not comfortable?
• On applications with floor or side wall
return registers near the floor, a small
heat strip should be considered.
• As we get older we prefer warmer
temperatures, a heat strip for just for
defrost cycles can add comfort for the
customer.
WHY IS THE RED LIGHT ON
STEADY?
The Red Light on steady is an
indication the Emergency Heat
Switch is on.
• The switch is used only if the heat pump is
inoperative, but not due to a power failure.
• Using the heating in this mode will increase
your power consumption.
• The red light is to remind the customer that
the temperature is being controlled by
resistance heat only.
THE RED LIGHT ON, BUT IT
IS FLASHING
The Emergency Heat switch is in the Normal
position.
RED LIGHT FLASHING
• If the red light is flashing, this is an
indication that the defrost board has
detected a defrost fault.
• Reset by moving the Emergency Heat
Switch to the “on” position for 30 seconds.
• If the flashing returns, service on the heat
pump may be required.