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ALLIED AIR
ENTERPRISES
IMPORTANT:
Before applying any power (main or low voltage) to the outdoor
unit, confirm the Comfort Sync™ thermostat has software
Version 2.13 or higher installed. (Reference the Comfort Sync™
thermostat manual.)
This unit is an integral component of a communicating system
that requires a Comfort Sync™ thermostat and communicating
air handler or furnace.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be
performed by a licensed
equivalent) or a service agency.
TABLE OF CONTENTS
I. GENERAL
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Appendix - Wiring Diagrams . . . . . . . . . . . . . . . . . . . .
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs AND HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
I. GENERAL
•
Refer to the specification sheet for information regard
ing electrical ratings, sound ratings, performance
ratings, unit dimensions and other technical data.
•
See Installation Instructions for unit installation and
charging procedures.
•
See long line set guidelines for lines exceeding 50 ft.
(including risers) and maximum risers of 20 ft.
SERVICE MANUAL
August 2015
professional installer (or
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7
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15
19
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21
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26
45
•
Refer to Comfort Sync™ thermostat manual for opera
tion and programming of thermostat.
•
Refer to indoor air handler/coil or furnace equipment
installation instructions for installation information.
•
These instructions are intended as a general guide and
do not supersede local codes in any way. Consult au
thorities who have jurisdiction before installation.
The 20LX units are high-efficiency residential split-sys
tems which feature a variable-capacity scroll
compressor and use HFC-410A refrigerant. Units are
available in 2, 3, 4 and 5-ton sizes. These units are de
signed for use only with an expansion valve (approved
for use with HFC-410A) in the indoor unit.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit
must be grounded in accordance with national and local
codes.
Line voltage is present at all components when unit is not
in operation on units with single-pole contactors.
Disconnect all remote electric power supplies before
opening access panel. Unit may have multiple power
supplies.
WARNING
Electrical components may hold charge. Do
not remove this panel or service this area for
5 minutes after the power has been
removed.
Electrical
IMPORTANT
Connect line voltage power supply wiring to the outdoor
unit before connecting low voltage wiring from the main
outdoor unit control to the thermostat. Failure to follow
this may result in a communication error.
Wiring must conform with current local codes and the current
National Electric Code (NEC). In Canada, wiring must con
form with current local codes and the current Canadian
Electrical Code (CEC).
24VAC TRANSFORMER
Use the transformer provided with the furnace or air hand
ler for low-voltage control power (24VAC - 40 VA
minimum).
1
4SCU20LX
4SHP20LX
Electrical Hazard
High Voltage
Wait 5 Minutes
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Summary of Contents for Armstrong Air 4SCU20LX
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Page 1: Table Of Contents
CLICK ANYWHERE on THIS PAGE to RETURN to ARMSTRONG HEATER AGE MANUALS CONTACT at InspectApedia.com SERVICE MANUAL 4SCU20LX ALLIED AIR ENTERPRISES 4SHP20LX August 2015 • Refer to Comfort Sync™ thermostat manual for opera IMPORTANT: tion and programming of thermostat. Before applying any power (main or low voltage) to the outdoor •... - Page 2 tions when the alert occurs, if the option to receive Load Shedding notifications is selected. Utility Load Shedding Mode DEACTIVATED Utility Load Shedding Mode ACTIVATED (Normal Equipment Operation) – When load shedding is (Utility Cycled Unit OFF) – The normally closed set of not required, the contacts in the utility load control receiver contacts in the utility load shedding control receiver OPEN.
- Page 3 ROUTE CONTROL WIRES Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with º º a temperature rating of 95 F (35 C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through field-provided field-installed grommet installed in electrical inlet.
- Page 4 CAUTION Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the unit's electronic controls. ELECTROSTATIC DISCHARGE Precautions will help to avoid control exposure to electrostatic discharge by (ESD) putting the unit, the control and the technician at the same electrostatic potential. Precautions and Procedures Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before performing any service procedure.
- Page 5 TABLE 1 Outdoor Control Terminal Designations and Input /Outputs (see figure 4 for terminal locations) Designator Description Input Output Common Switched 24VAC For heat pump applications only. nominal O OUT For heat pump applications only. 24VAC common LO PS Low pressure switch 5ma @18VAC LO PS Low pressure switch sensing connection...
- Page 6 Table 1 continued. Outdoor Control Terminal Designations and Input /Outputs WARNING - Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes. The 4 pins in P6 have the potential of transferring up to 250 volts to the unit cabinet ground. Designator Description (Outdoor Board) Input...
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Page 7: Ii. System Operation And Service
II. SYSTEM OPERATION AND SERVICE Connect line voltage power supply wiring to the outdoor unit before connecting low voltage wiring from the main outdoor unit control to the thermostat. Failure to follow this may result in a communication error. • Disconnecting R wire from the outdoor control R 7-Segment Alert and System Status Codes terminal. - Page 8 Table 2. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
- Page 9 Table 2. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
- Page 10 Table 2. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
- Page 11 Table 2. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
- Page 12 Table 2. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert ®...
- Page 13 POWER-UP / RESET: 7-SEGMENT POWER-UP DISPLAY STRING FIRMWARE VERSION: During initial power-up or reset, the first item displayed is the outdoor control firmware version. Example to the right shows firmware version 2.3. UNIT TYPE: The next item displayed is the self discovery unit type.
- Page 14 Table 3. Outdoor Control 7-Segment Unit Status Displays Description Example of Display Idle Mode: Decimal point flashes at 1 Hz (0.5 second on, 0.5 second off). Idle Mode: Decimal point flashes at 1 Hz. Display OFF. Soft Disable Mode: Top and bottom horizontal line and decimal point flash at 1 Hz.
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Page 15: Outdoor Control Push-Button Operation
PUSH − BUTTON OPERATION Outdoor control must be in IDLE mode (no heating or Allows field access to Diagnostic, Fan, Defrost and Error Code cooling operation). Recall modes. NOTE - See table 2 for explanation of codes. Push and hold button until mode To enter mode options, push and hold button next to 7seg... - Page 16 Idle mode — System is energized with no demand — Decimal flashes at 1 Hertz > 0.5 second ON, 0.5 second OFF. Display Symbol or Display Fan Test and Display String Option Character Displayed Display string shows outdoor control firmware version 1 _ 6 > pause> A C or H P unit >pause>unit capacity in BTUs>pause >unit code. If 3 during start-up horizontal bars are displayed during any sequence of this display string, it indicates that the specific parameter is not configured.
- Page 17 6. Monitor the low-side pressure at the outdoor unit. The internal vacuum protection in the compressor and/or one of the pressure switches prevents full recovery of the refrigerant into the outdoor unit. When the system reaches this condition, the suction line service valve PUMP DOWN PUMP DOWN should be shut off and the Pump Down Jumper...
- Page 18 How to enable liquid line temperature information on a 7-segment display NOTE - If system power is recycled, display string reverts back to Both coil and liquid line temperatures can be enabled for display default. Repeat the procedure which enables the outdoor coil and either during normal demand operation or while in idle mode.
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Page 19: Configuring Unit
Configuring Unit When installing a replacement outdoor control, the unit selection code may have to be manually assigned using the 7-seg ment display and push button on the control. The unit code sets unit type, capacity and outdoor fan RPM. Configuring Unit Selection Code Power-up - Unit selection code (two-digit number) displayed represents unit size code (outdoor unit capacity). -
Page 20: Reconfiguring Outdoor Control Using Comfort Sync™ Thermostat
Compressor anti-short-cycle delay timer status Reconfiguring Outdoor Control using ® Cooling rate Comfort Sync Wi-Fi Thermostat Compressor shift delay timer status If any component of the HVAC system is changed, e.g. re High pressure switch status placing an outdoor sensor, reconfiguring the system is Low pressure switch status required. -
Page 21: Maintenance
NOTE - If insufficient heating or cooling occurs, the unit Maintenance should be gauged and refrigerant charge should be Outdoor Unit checked. Maintenance and service must be performed by a qualified Outdoor Coil installer or service agency. At the beginning of each cooling It may be necessary to clean the outdoor coil more fre... - Page 22 Utility Load Shedding OUTDOOR CONTROL NOTE - For more information on Load Shedding, see Electrical section. Figure 11. Load Shedding Feature Wiring Diagram...
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Page 23: Unit Sequence Of Operations
Unit Sequence of Operation The following figures illustrate the overall unit sequence of operation along with the operation of various pressure switches and temperature sensors. The figures also illustrate the use of the compressor anti-short-cycle function in relation to unit Status, unit Fault and lock-out LED Codes and unit system operation interactions. - Page 24 INITIAL TRIP PRESSURE SWITCH IS CONTACTOR Y1 DEMAND CLOSED SWITCH (S87) IGNORED FOR ENERGIZED 90 SECONDS PRESSURE SWITCH IS CLOSED OR OUTDOOR CLOSED OPEN AMBIENT TEMPERATURE IS 15ºF SWITCH (S87) OR BELOW CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized.
- Page 25 HIGH TOP CAP PRESSURE CONTACTOR CLOSED CLOSED Y1 DEMAND SWITCH (S173) SWITCH (S4) ENERGIZED HIGH PRESSURE CLOSED OPEN SWITCH (S4) CONTACTOR DE-ENERGIZED The thermostat terminates demand when the contactor is de-energized. If demand is satisfied when alarm is not active, the OPEN 5-strike counter resets.
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Page 26: Component Testing
Component Testing Component Testing Table of Contents Verifying High Pressure and Low Pressure Switch Oper Line Filter (Electromagnetic Compatibility Circuit - EMC) ation Operations, Checkout and Status / Error Codes Outdoor Fan Operation and Checkout Compressor Operation, Checkout and Status / Error Codes Ferrites Outdoor Control Operation, Checkout and Status / Error... - Page 27 High and Low Pressure Switch Errors Table 6. Outdoor Control 7-Segment Display Alert Codes - High and Low Pressure Switches System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
- Page 28 STATUS CODES: When the compressor is running, the 7segment display on the outdoor control sends the current compressor demand (as a percentage) to the room thermostat. (Example: C 5 0 – compressor is running at 50% of maximum speed.) Figure 17. Compressor Operation, Testing and Status/Error Codes ERROR CODES: Table 7.
- Page 29 Table 7. Outdoor Control 7-Segment Display Alert Codes - Compressor System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat..
- Page 30 Crankcase Heater, Testing and Status / Error Codes OPERATION: CRANKCASE HEATER (HR1) Compressors in all units are equipped with a 40 watt belly-band type crankcase heater. The heater prevents liquid from accumulating in the compressor. The heater is controlled by the crankcase heater thermostat. CRANKCASE HEATER THERMOSTAT (S40) Crankcase heater thermostat S40 controls the crankcase heater in all units and is located on the liquid line.
- Page 31 Figure 20. Checking Crankcase Heater Thermostat STATUS CODE: None ERROR CODES: None Top Cap Switch Operation, Testing and Status / Error Codes OPERATION: Top Cap Thermal Sensor Switch (S173) Some units are equipped with a compressor-mounted normally closed temperature switch that prevents compressor dam age due to overheating caused by internal friction.
- Page 32 ERROR: Table 8. Outdoor Control 7-Segment Display Alert Codes - Top Cap Switch NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
- Page 33 Line Filter (Electromagnetic Compatibility Circuit - EMC) Operations, Testing and Status / Error Codes OPERATION: The line filter reduces the unintentional conducted emission from the equipment, to a level sufficient to pass regulatory limits (such as FCC part 15). The filter is rated at 208/230 volt, 30 amp maximum, 60 Hertz. NOTE - The 2- and 3-ton inverters have the EMC builtin.
- Page 34 Outdoor Fan Operation and Testing OPERATION: hese units use an integrated control and motor that is programmed for variable-capacity operation. The fan speed is controlled by the Comfort Sync™ thermostat. TESTING: VAC Voltage Check Check for 208/240 VAC power at inverter contactor (red wires) (see figure 26). With unit operating, check for main VAC to motor and outdoor control VDC output to motor: 1.
- Page 35 VDC Voltage Check: Check for VDC out of Fan PWM and COM. VDC output reading is determined by the percentage of room thermostat de mand. 1. No voltage present – Remove wires from control and check for VDC. If there is no voltage present, then replace out door control.
- Page 36 Outdoor Control Operation, Testing and Status / Error Codes OPERATION: The outdoor control is a microprocessor-based device for use with variable-capacity compressors up to 5-tons in capacity operating on 24VAC residential power. The outdoor control integrates the functionality of maintaining compressor speed, demand, defrost and fan PWM controls.
- Page 37 ERROR CODES: Table 10. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
- Page 38 PIN# / WIRE RESISTANCE VALUES TEMP RANGE ºF SENSOR SLEEVE COLOR RANGE (OHMS) (ºC) NONE 6 AND 5 314669 and 3779 OUTDOOR 336,000 to 2,487 (see 4 AND 3 AMBIENT -40 (-40) TO table 11 on page 39 for (BLACK) 140 (60) exact temperature to 2 AND 1...
- Page 39 Table 11. Ambient and Liquid Line Sensors Temperature / Resistance Range Degrees Fahr Degrees Fahr Degrees Fahr Degrees Fahr Resistance Resistance Resistance Resistance enheit enheit enheit enheit 136.3 2680 56.8 16657 21.6 44154 -11.3 123152 133.1 2859 56.0 16973 21.0 44851 -11.9 125787...
- Page 40 ERROR C C O C ODES: Table 12. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed.
- Page 41 Heat Sink Intelligent Power Module Converter Power Factor Correction Circuit Communication Control Figure 33. 4- and 5-Ton Unit Inverter STATUS CODES: Table 13. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/de humidification).
- Page 42 Table 14. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
- Page 43 Table 14. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
- Page 44 Table 14. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert codes are also displayed on the thermostat.
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Page 45: System Refrigerant
Emergency 24VAC System Operation The Y terminal located on the outdoor control allows the outdoor unit to be cycled ON and OFF using 24VAC inputs. The outdoor unit will operate at 100% capacity in this configuration. The following wiring diagrams display the wiring changes needed to switch a full communicating system to a non-communic ating system with the unit running in emergency mode (24VAC inputs to outdoor unit). - Page 46 MANIFOLD GAUGE SET HIGH GAUGE SET OUTDOOR UNIT CONNECTIONS FOR TESTING AND CHARGING REFRIGERANT TANK CHARGE IN LIQUID PHASE SUCTION LINE DIGITAL SCALE TO LIQUID TEMPERATURE SENSOR LINE SERVICE (LIQUID LINE) PORT TEMPERATURE SENSOR CLOSE MANIFOLD GAUGE SET VALVES AND CONNECT THE CENTER HOSE TO A CYLINDER OF HFC-410A SET FOR LIQUID PHASE CHARGING. CONNECT THE MANIFOLD GAUGE SET'S LOW PRESSURE SIDE TO THE SUCTION LINE SERVICE PORT.
- Page 47 Use the WEIGH-IN method for adding initial refrigerant charge, and then use SUBCOOLING method for for verifying refrigerant charge. WEIGH-IN CHARGING METHOD NOTE - Insulate liquid line when it is routed through areas where 64ºF (17.7ºC) and Below the surrounding ambient temperature could become higher than Adjust amount for variation in the temperature of the liquid line or when pressure drop is equal line set length and liquid line...
- Page 48 LINE SET REQUIREMENT Line set lengths between 51 and 150 linear feet: Crankcase heater and nonbleed port TXV factory-in Total equivalent length equals 180 feet (all piping and stalled. No additional components required. Vertical fittings included). vapor riser must be sized to the vapor riser listed in ta NOTE - This is a general guide.
- Page 49 Typical Unit Parts Arrangement CONTROL PANEL FOR 24 AND 36 MODELS OUTDOOR CONTROL DC INVERTER CONTROL GROUND LUG INVERTER REACTOR CONTACTOR-SPST CONTROL PANEL FOR 48 AND 60 MODELS OUTDOOR CONTROL DC INVERTER CONTROL INVERTER NOISE FILTER INVERTER REACTOR CONTACTOR-SPST GROUND LUG Figure 39.
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