Carrier 50HCQA Installation Manual Page 23
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Power Exhaust (SAVt units)
To enable power exhaust, set Power Exhaust Installed
(ConfigurationECONPE.EN) to YES. Both power exhaust
fans are wired together and are controlled by the configuration
Power Exhaust Stage1 CFM (ConfigurationECONPE1.C).
When the Indoor Fan Max Speed CFM (ConfigurationECON
IDF.C) is set to the correct supply duct CFM (either by fan
tables or air balance report) the control will calculate the outside air
CFM based on outside air damper position and Commanded Fan
Speed (OutputsFANSF. S P D ) to turn on the power exhaust
when the calculated outside air CFM reaches Power Exhaust
Stage1 CFM (PE1.C). The power exhaust will then turn off when
the calculated outside air CFM falls below Power Exhaust Stage1
CFM (PE1.C). The Power Exhaust Stage2 CFM (Configuration
ECONPE2.C) is not currently used on these products.
Indoor Air Quality (IAQ)
The ComfortLINK control has the capability for several methods
of demand ventilation control. Indoor air quality is typically
measured using a CO
2
sensor whose measurements are displayed
in parts per million (ppm). Outdoor air quality may be measured
with a CO
2
sensor for indoor-outdoor differential demand
ventilation control, or with other sensor types for the outdoor air
lockout function. The factory-installed indoor air quality CO
2
sensor is mounted in the return section. A field-installed indoor air
quality CO
2
sensor may be mounted in the return duct or directly
in the occupied space, per job requirements. The indoor air quality
modes of operation can be affected by configurations for indoor air
quality sensor (ConfigurationAIR.QIA.CF), indoor air
quality switch (ConfigurationAIR.QII.CF), outdoor air
quality sensor (ConfigurationAIR.QOA.CF) and other
related fan and limit configurations as described below.7
IAQ (Analog Input)
The ComfortLink control is configured for indoor air quality
sensors which provide 4 to 20 mA signal for 0 to 2000 ppm CO
2
.
If the sensor being used has a different range, the ppm display
range must be reconfigured by entering new values for the IAQ
Sensor Value at 4mA (ConfigurationAIR.QI.4M)andIAQ
Sensor Value at 20mA (ConfigurationAIR.QI.20M).
IA.CF = O (No IAQ)
IA.CF = 0 signifies that there is no IAQ sensor installed. The
damper will operate at the Econ Min at Max Fan Speed
(ConfigurationECONMP.MX) when the fan is at Supply Fan
Maximum Speed (ConfigurationI.FANFS.MX)andthe
damper position will vary at other fan speeds as described in the
Economizer section, when the space is occupied and the indoor fan
is on.
IA.CF = 1 (DCV)
When IA.CF = 1, the IAQ algorithm is set for Demand Control
Ventilation (DCV). During DCV, the damper modulates between
two user configurations depending upon the relationship between
the Indoor Air Quality (IAQ) and the Outdoor Air Quality (OAQ).
The lower of these two positions is referred to as the Econo Min
IAQ Position (ConfigurationAIR.QAQ.MN), while the
higher is referred to as the Econ Min at Max Fan Speed
(ConfigurationECONMP.MX). The Econo Min IAQ
Position (AQ.MN) should be set to an economizer position that
brings in enough fresh air to remove contaminates and CO
2
generated by sources other than people. The Econ Min at Max Fan
Speed (MP.MX) should be set to an economizer position that
brings in fresh air to remove contaminates and CO
2
generated by
all sources including people when the indoor fan is operating at the
Supply Fan Maximum Speed (ConfigurationI.FANFS.MX).
The Econ Min at Max Fan Speed (MP.MX) value is the design
value for maximum occupancy.
The ComfortLink control will begin to open the damper from the
Econo Min IAQ Position (AQ.MN) position when the IAQ level
begins to exceed the Outdoor Air Quality (OAQ) level by a
configurable amount. This amount is referred to as AQ Differential
Low (ConfigurationAIR.QAQD.L). When the differential
between IAQ and OAQ reaches AQ Differential High
(ConfigurationAIR.QAQD.H), the economizer position will
be at the Econ Min at Max Fan Speed (MP.MX) when the indoor
fan speed is at Supply Fan Maximum Speed (FS.MX). When the
IAQ/OAQ differential is between AQ Differential Low (AQD.L)
and AQ Differential High (AQD.H), the control will modulate the
damper between Econ Min at Max Fan Speed (MP.MX) and Econo
Min IAQ Position (AQ.MN) in a linear manner as shown in Fig. 8.
At other fan speeds the economizer damper will operate in the
shaded area between the two economizer position curves but at the
actual fan speed as indicated by Commanded Fan Speed (Outputs
FANSF. S P D ). (See Fig. 7.)
VENTILATION FOR PEOPLE
VENTILATION FOR SOURCES
INCREASING VENTILATION
ECON MIN
AT MAX
FANSPEED
POSITION
(MP.MX)
MINIMUM
IAQ
DAMPER
POSITION
(AQ.MN)
100 700 INSIDE/OUTSIDE CO
2
DIFFERENTIAL
AQ
DIFFERENTIAL
LOW (AQD.L)
AQ
DIFFERENTIAL
HIGH (AQD.H)
C11476
Fig. 8 -- Economizer Minimum Position
IA.CF = 2 (Override IAQ)
When IA.CF = 2, the IAQ algorithm maintains the damper at Econ
Min at Max Fan Speed (ConfigurationECONMP.MX)when
the indoor fan speed is at Supply Fan Maximum Speed
(ConfigurationI.FANFS.MX) or along the curve on Fig. 7
when the indoor fan speed is at the Commanded Fan Speed
(OutputsFANSF. S P D ) until the override condition triggers.
The override triggers when the IAQ/OAQ differential is greater
than AQ Differential High (ConfigurationAIR.QAQD.H).
The IAQ Override Position (ConfigurationAIR.QOVR.P)
sets the damper position during override. The economizer
damper will return to the Econ Min at Max Fan Speed (MP.MX)
or MP.MX curve at other fan speeds when the IAQ/OAQ
differential is less than the AQ Differential Low
(ConfigurationAIR.QAQD.L).
The override algorithm will operate whenever the building is
occupied and the indoor fan is operating or whenever the IAQ
algorithm has caused the indoor fan to operate. The IAQ Analog
Fan Config (ConfigurationAIR.QIA.FN) determines whether
or not the IAQ algorithm can turn on the indoor fan. If the indoor
fan is not operating, the economizer position will be zero. If the
override is not active and the building is unoccupied, the
economizer position will be zero. The damper position may exceed
Econ Min at Max Fan Speed (MP.MX) or IAQ Override Position
(OVR.P) to provide economizer cooling.
ComfortLINK v2.X
- 48/50HC 04---28 1
- Single Package Rooftop Units 1
- SAFETY CONSIDERATIONS 2
- BASIC CONTROL USAGE 3
- Accessory Navigator Display 4
- Operation 4
- CCN Tables and Display 4
- Force Hierarchy 5
- Generic Status Display Table 5
- START-UP 6
- Condenser Fans and Motors 7
- Return--Air Filters 7
- Outdoor--Air Inlet Screens 7
- Accessory Installation 7
- Orifice Change (48HC) 7
- Gas Heat (48HC) 8
- Economizer 9
- SERVICE TEST 12
- THIRD PARTY CONTROL 13
- CONTROLS OPERATION 14
- General Operation 15
- Occupancy Determination 16
- Cooling Mode Control 18
- Staging Control 18
- Compressor Control 19
- Outdoor Fan Control 19
- Heating Mode Control 19
- Heat Relay Control 20
- Economizer Position % 21
- Fan Speed % 21
- Free Cooling 22
- Thermostat Control 22
- Space Sensor Control 22
- Unoccupied Free Cooling 22
- Power Exhaust (CV units) 22
- Power Exhaust (SAVt units) 23
- IAQ (Analog Input) 23
- IAQ (Switch Input) 24
- Fan Enable (Switch Input) 24
- Dehumidification Demand 25
- Reheat Modes 25
- Temperature Compensated Start 29
- Carrier Comfort Network (CCN) 30
- Configuration 30
- Demand Limit 30
- TROUBLESHOOTING 31
- Complete Unit Stoppage 32
- Restart Procedure 32
- Alarms and Alerts 32
- MBB --- Main Base Board 37
- Green LED 39
- Yellow LED 39
- Cooling Troubleshooting 40
- Economizer Troubleshooting 42
- Heating Troubleshooting 43
- IDM – Induced-Draft Motor 44
- “AUTO” position 44
- Phase Loss Protection 46
- Thermistor Troubleshooting 46
- CIRCUIT “B” 49
- CIRCUIT “A” 49
- Transducer Troubleshooting 50
- Forcing Inputs and Outputs 50
- MAJOR SYSTEM COMPONENTS 53
- RED LED - STATUS GREEN LED 62
- LEN (LOCAL EQUIPMENT NETWORK) 62
- YELLOW LED 62
- CCN (CARRIER COMFORT NETWORK) 62
- INSTANCE JUMPER (SET TO 1) 62
- RED LED-STATUS 66
- 48/50HC 04--14 Units — 67
- 48/50HC 17--28 Units — 68
- Central Terminal Board (CTB) 68
- Scrolling Marquee Display 70
- Accessory Navigatort Display 70
- Interface 70
- Protective Devices 72
- Field-Installed Accessories 72
- MODE — RUN STATUS 75
- MODE — RUN STATUS (cont) 76
- MODE — SERVICE TEST 78
- MODE — TEMPERATURES 78
- MODE — PRESSURES 78
- MODE — INPUTS 79
- MODE — OUTPUTS 79
- MODE — SET POINTS 79
- MODE — CONFIGURATION 80
- MODE — TIME CLOCK 85
- CCN ONLY TABLES 85
- MODE — OPERATING MODES 86
- MODE — OPERATING MODES (cont) 87
- MODE — ALARMS 89
- VFD Diagnostics 95
- Table 32 — FAULT CODES (cont) 96
- Table 33 – ALARM CODES 97
- INDICATE UNIT SETTINGS BELOW 98
- MODE — CONFIGURATION (cont) 100
- ComfortLINK v2.X 100
- ELECTRICAL 103
- TEMPERATURES 103
- PRESSURES 103
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