Download Outdoor fan type

Two Stage
Communicating
System
Company Private
PRODUCT STRATEGY
Back Up
Speaker: Budhiraja
TSTAT0101SC (Sept. 2011)
Update
*9MAC (Sept. 2011)
*9MVT (Sept. 2011)
*8MVL (2010)
FCM4X (Oct. 2011)
SS AC & HP (Oct. 2011)
2S AC & HP (Feb. 2012)
Model 2 Stage Communicating
• R410A Air Conditioner (2-5 ton even sizes)
– CCA9, HCA9, TCA9
– CCA7, HCA7, TCA7
• R410A Heat Pump (2-5 ton even sizes)
– CCH9, HCH9, TCH9
– CCH6, HCH6, TCH6
SAME WALL CONTROL AS
SINGLE STAGE
Observer™ Wall Control
OD Control Board
P/N
1184935
5
What allows the communication:
Outdoor
Indoor fan coil
Observer™ Control
Communication or Standard Stat
• Do not use both connections, either use the
DX connections or the standard stat
connections.
• If you planning to use an Observer™ but
need to use standard stat for emergency,
make sure the communicating plugs are
removed from equipment DX connectors.
Model Plug location
Uses model plug to determine:
 Unit capacity
 Compressor type
 Outdoor fan type
 Type of the outdoor unit (AC/HP)
Model Plug
Doesn’t matter which way installed on pins
8
Replacement board will not come with
model plug, must transfer plug to new
board.
Model plug takes priority over factory
model information input at the factory . If
removed after initial power up the unit will
operate according to the last valid model
plug installed.
Model Plug
On new units, the model and serial numbers are input
into the boards memory at the factory.
Replacement boards have no model plug therefore the
model plug must be saved from original board and
transferred to new board.
System Communicating Concept
• Input/Output logic communicating between variable
speed indoor and outdoor units through the Observer™
wall control.
• Allows system to adjust for maximum comfort and
efficiency. (multiple stages of cooling and heat.)
• Airflow for two stage outdoor requires two different indoor
airflow settings for proper operation. Indoor blower must
be set up per indoor instructions for 2 stage outdoor CFM
requirements.
ID Fan Motor Types
•
•
•
•
9MAC Full Function ECM
9MVT PWM ECM
8MVL Full Function ECM
FCM4X PWM ECM
All have the communication bus in ID board
OD Fan Motor Type
• (Single Stage OD) PSC Type: CCH6, HCH6, TCH6,
CCA7, HCA7, TCA7
– Fan relay on control board turns the fan on and off by
opening and closing the high voltage circuit to the
motor. It does not change speeds between low and
high stage operation of the compressor.
• (Two Stage OD) ECM Type: CCH9, HCH9, TCH9, CCA9,
HCA9, TCA9
– Motor is continuously powered with high voltage,
speed determined by electrical pulses from the PWM
outputs on the OD control board.
– The motor adjust RPM to outdoor conditions. Table in
the install manual explains.
High Voltage sensing
and for FAN and CCH
PWM output for
ECM fan
PWM1
PWM2
P/N 1184935
13
OD Fan Motor Troubleshoot
• Test PWM output at OD board terminals
with a voltmeter set to DC volts.
Compressor Staging
• Basic scroll design modified with internal unloading
mechanism. It opens a bypass port in first compression
pocket and reduces the displacement of the scroll when
unloading.
• Operates approximately 67% capacity when the solenoid
is not energized and 100% capacity when the solenoid is
energized.
• Loading and unloading is done “on the fly” without
shutting off the motor between steps.
Scroll Compressor
Unloading
• Molded solenoid plug to compressor converts 24Vac to
24Vdc with an internal rectifier.
• Plug output should read 24Vdc if calling for high stage.
Internal Protection
• Internal Pressure Relief (IPR)-relieves pressure discharge
gas into compressor shell if differential between suction
and discharge exceeds 550-625 psig.
• Internal overload in motor windings.
Control Inputs
Low pressure
Switch input
High pressure
switch input
Compressor
Transformer input
P/N 1184935
17
OCT
OAT
Compressor Control
• VS and L2 function
– Monitors high voltage to the compressor and for
diagnostics.
– Voltage should be present anytime compressor
contactor is pulled in, no voltage if not pulled in.
• Compressor always starts in Low for 5 seconds
regardless of call
• Easier starting
C-24VAC com rtn contactor
C-24VAC com rtn solenoid
Lo/on-run cap
Hi-compressor solenoid
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Troubleshooting Compressor
Staging
• Suction pressure at the service valve should be reduced by
3-10% when switching from low to high capacity.
• Note the liquid pressure will be very similar in high and low
stage so do not use this to determine.
• Compressor current should increase 20-45% when
switching stages.
• In high stage the compressor DC solenoid coil should be
energized
Unloader Test Procedure
• Check for amperage change at least 20 percent when
cycling from high to low at wall control.
• If not, remove the solenoid plug from compressor. With
unit running and wall control calling for high stage, check
voltage at the plug with a DC meter..should be 24volt DC.
• If correct DC at control circuit molded plug, measure the
compressor unloader coil resistance. Resistance should
be 32-60 ohms depending on compressor temp. If coil
resistance is infinite, much lower than 32 ohms or is
grounded, the compressor must be replaced.
HP DEFROST
Quiet Shift can
be enabled:
•on the board
(non
communicating)
•or with the
observer™ wall
control (comm)
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Forced Defrost Pins
Defrost time and Quiet Shift switches
Defrost
Reversing Valve
Outdoor coil temperature
Outdoor air temperature
Control Board interval times
Quiet Shift
• Field selectable defrost mode which may eliminate
occasional noise that could be heard at the start and end of
defrost cycles.
• At start of defrost cycle the reversing valve will energize
and compressor will turn off for 30 seconds, then turn back
on to complete defrost.
• At the end of defrost cycle the reversing valve deenergizes, compressor will turn off for another 30 seconds,
then the fan will turn off for 40 seconds before starting in
the heating mode.
Defrost Options and Operation
• Interval Time options:
– 30, 60, 90, 120 or Auto (Observer™ Control
overrides the dip switch settings (see next slide)
• Defrost initiate temp: 32° F
• Defrost terminate temp: 65° F or 10 min has passed.
• Defrost will not occur if over 50° F outdoor
temperature exist.
• If OAT is >25*F defrost will occur in high or low stage
as demanded by stat or observer.
• If OAT is </= 25*F defrost will occur in high stage and
terminate at 50*F coil temp with min 2.5 min defrost.
24
Auto Defrost:
Adjust the defrost interval time based on the last defrost time
25
DEFROST TIME
NEXT DEFROST INTERVAL
< 3 minutes
120 minutes
3 to 5 minutes
90 minutes
5 to 7 minutes
60 minutes
> 7 minutes
30 minutes
Forced Defrost
• Forced defrost pins provided on board
• Short pins for 5 sec and release
• If coil temp is below initiate and outdoor temp
is below 50*F – full defrost cycle
• If coil temp is above initiate temp OR outdoor
temp is above 50 – 30*F second defrost cycle
occurs
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Defrost Termination Fan
Operation
• ODF will remain off for 20 seconds after defrost
termination. Allows time for system to capture the heat
from the od coil and reduce the steam cloud effect that
may occur on transition of defrost to heating cycle
Defrost hold
• On non-communicating system the thermostat becomes
satisfied (Y1 or Y1 and Y2) before the defrost cycle is
terminated, the control will “hold” in defrost mode and finish
the cycle on the next call for heat.
• On communicating systems the Observer™ doesn’t need
hold because the system will complete the defrost cycle
before shutting down the system.
Time Delays
• 20 second outdoor fan delay after defrost
– Reduces fog effect
• 15 second aux heat hold after defrost termination
(W1)
– Prevent cold blow
• 1 minute delay in cooling mode before turning
outdoor fan off if outdoor temp is 100 deg F or higher
– For easier starting
• 30 second compressor delay and 40 second OD fan
delay after defrost before starting in heat mode if
Quiet Shift enabled.
29
Time Delays (cont.)
• 2 minute to return to standby from last valid
communication (Observer™ Wall Control Only)
• 5-minute time guard between compressor cycles
– Can be defeated by shorting forced defrost pins
for 1 second and releasing
– Or by pressing heat to or cool to button for 10
seconds.
• 5 minute compressor re-cycle delay on return from a
brown-out condition.
30
Refrigerant Control
• ID all to have cooling TXV
• OD Heat pumps will have heating pistons.
Outdoor Thermistors
Electronic devices that sense temperature, as temp
increases, resistance decreases.
OD unit has two: OAT and OCT
Coil and Outdoor temp thermistors are compared to verify proper operating
range
COMPARISON OCCURS:
•20 min after defrost termination, not during
defrost
•Ignored until unit as run for 5 consecutive
minutes
Sensor failure:
the system reverts to default
operation
If OAT fails low ambient cooling will not
be allowed and one minute outdoor fan
off delay will not occur.
If OCT fails low ambient cooing will not
be allowed.
32
Troubleshoot Thermistors
Sensors may be out of range if:
• If OAT indicates 10*F warmer
than the OCT
• If the OAT indicates 20*F
cooler than the OCT
OPEN if resistance is reads 500K
Ohms or higher (-50ºF or below)
SHORTED if resistance reads 1K
ohms Or lower (188ºF or higher)
33
Liquid Line Solenoid
Observer™: LLS
output is at the
Y1. The LLS coil
is 24Vac. Y1
gives 24Vac
signal anytime the
compressor is
energized.
Standard Stat:
LLS is
connected to the
Y1 and C
terminals.
Energized
anytime
compressor is
running.
LLS is required in HP long line applications to control refrigerant migration
in the heating mode. Install near outdoor unit with the arrow facing the
outdoor unit, this is direction of flow.
Utility Saver Operation
Communicating Mode
• Utility Curtailment is not available directly with the
Observer™ Wall control.
• To accomplish curtailment with the Observer a daughter
board kit must be used to convert the control signals to
standard thermostat signals.
35
Utility Saver Operation
Non-Communicating Mode
• The utility company provided relay should be wired in the
Y2 thermostat lead. This allows a power utility to interrupt
high stage compressor operations during peak load
periods.
• If the utility requires control of the low stage compressor
operation a second utility curtailment relay should be wired
in the Y1 lead.
36
Low Ambient Cooling Operation
• Is not available for the 2 stage communicating or non
communicating system at this time. Low ambient kits are
not set up and not to be installed.
• Consideration may be given in future Observer™ software
to allow this to be done.
Single stage communicating and non communicating systems
can apply low ambient cooling controls. See single stage
training and literature. Considering if future may allow this
in Observer software.
37
Diagnostics
Status Codes
Diagnostics LED on OD Board
•Green COMM LED1 will indicate successful communication
•Off until communication is established
•Amber STATUS LED2 to display operating mode or error conditions
•If multiple errors exist, the highest priority error will be flashed on
circuit board
Status (amber) light
is read by series of short and
long flashes.
Example: code 74
7 short flashes followed by 4
long flashes.
High Voltage Monitoring Brown Out
Detection (230V)
Code 46
• If line voltage drops below 187, a brown out condition is
declared
• Operation is not allowed until voltage is 190 or higher for at
least 4 seconds
• Unit is shipped with Brown Out Active
Can be defeated if needed. Defeat by shorting forced defrost
pins from power up with both OAT and OCT sensors
removed. Status Code 6 disabled. Code 5 is active. Install
instructions detail.
41
Observer™
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