Carrier 50HCQA Installation Manual Page 25
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Sensor Value at 4ma (ConfigurationAIR.QH.4M)setsthe%
display for a 4mA input from the relative humidity sensor. RH
Sensor Value at 20ma (ConfigurationAIR.QH.20M)setsthe
% display for a 20mA input from the relative humidity sensor.
Dehumidification Demand
When using a humidistat or switch input, the demand for
dehumidification is seen as Space Humidity Switch (Inputs
GEN.IHUM) being Low or High. A low value means
humidity level is good and a high value means that
dehumidification is needed. When using an RH sensor, the demand
is based on the Space Humidity Sensor (InputsAIR.QSP.RH)
value compared to the Space RH Occupied Setpoint
(SetpointsRH.SP) during the occupied period and Space RH
Unoccupied Setpoint (Setpoints RH.UN) during unoccupied
periods. If the Space Humidity Sensor (SP.RH) value is above the
Space RH Setpoint (RH.SP), then dehumidification is needed. If
the Space Humidity Sensor (SP.RH) value is below the Space RH
Setpoint (RH.SP) minus the Space RH Deadband
(SetpointsRH.DB), then dehumidification is no longer needed.
If the unit is configured for space sensor control
(ConfigurationUNIT U.CTL = 3), then the setpoint Reheat
Heat SP Deadband (SetpointsRH.HB) applies. This
configuration sets the offset above the heating set point at which a
unit in Reheat2 mode will turn off. This is a protection against over
cooling the space and causing a heat demand.
NOTE: When there is a dehumidification demand, the economizer
damper position is limited to it’s minimum damper position
(Operating ModeECONEC.MP).
Reheat Modes
Dehumidification (reheat) is a cooling mode function. Refer to
Cooling Operation for cooling mode control. With Humidi--MiZer
units there are three additional HVAC Mode (HVAC) expanded
texts available for the user: Reheat1, Reheat2, and
Reheat1/Reheat2. Selection of the reheat mode for each refrigerant
circuit is determined by the dehumidification demand and the
cooling demand. Table 8 shows the corresponding circuit mode
and output status for the different demand combinations. Units
with multiple circuits can operate with a combination of Reheat1
and Reheat2 circuits, as determined by the amount of space cooling
demand. See Appendix B for complete tables of unit operation
response to thermostat and humidity inputs.
NOTE: Compressor staging control for Humidi--MiZer units
requires that circuit A always operates when circuit B is on. This
applies to normal operation, service test, and for control alarm
responses. This operation difference is required due to the fact that
the Motormaster outdoor fan control senses circuit A only.
Operation of the revised refrigerant circuit for each mode is
described below.
NOTE: x = refrigerant circuit A or B
Normal Cooling
For 48/50HC04--12 units, refrigerant flows from the outdoor
condenser through the normally open Cooling Liquid Valve
(CLV.x) to the expansion device. Reheat Liquid Valve (RLV.x) and
Reheat Discharge Valve (RDV.x) are closed. (See Fig. 9.)
For 48/50HC14--28 units, refrigerant flows from the outdoor
condenser through the de--energized 3--way Liquid Diverter Valve
(LDV.x) to the expansion device. Reheat Discharge Valve (RDV.x)
is closed. (See Fig. 12.)
Reheat 1 (Subcooling Mode)
This mode increases latent cooling and decreases sensible cooling
compared to normal cooling.
For 48/50HC04--12 units, refrigerant flows from the outdoor
condenser, through the normally open Reheat Liquid Valve
(RLV.x), and through the reheat condenser coil to the expansion
device. Cooling Liquid Valve (CLV.x) and Reheat Discharge Valve
(RDV.x) are closed. (See Fig. 10.)
For 48/50HC14--28 units, refrigerant flows from the outdoor
condenser, through the energized 3--way Liquid Diverter Valve
(LDV.x), and through the reheat condenser coil to the expansion
device. Reheat Discharge Valve (RDV.x) is closed. (See Fig. 13.)
Reheat 2 (Hot Gas Reheat Mode)
This mode provides maximum latent cooling with little to no sensible
capacity. This mode can operate to provide dehumidification when
there is no cooling demand. Similar to Reheat 1 mode, refrigerant
flows from the outdoor condenser, through the normally open Reheat
Liquid Valve (RLV1.x), or through the energized 3--way Liquid
Diverter Valve (LDV.x), and through the reheat condenser coil to the
expansion device. Reheat Discharge Valve (RDV.x) is open which
provides some compressor discharge gas to the reheat condenser to
further increase the reheat of the evaporator air stream (See Fig. 11 or
14 based on unit and size).
Table 8 – Control Modes with Humidi--MiZert System
Output and Valve States versus Circuit Mode .x = Circuit A or B identifier
DEMAND AND MODE OUTPUTS 48/50HC 04--- 12 VALVES 48/50HC 14--- 28 VALVES
Space
Humidity
Circuit
Cooling
Demand
Circuit
Mode
Circuit
Compressor
(CMP.x)
Cooling---
Reheat
Control
(CRC)*
Reheat2
Valve
(RH2.x)
CLV.x
Valve
2 --- w a y
RLV.x
Valve
2---way
RDV.x
Valve
2 --- w a y
RLV.x
Valve
3---way
RDV.x
Valve
2---way
— — No power Off Off Off
Off
(open)
Off (open)
Off
(closed)
Off
Off
(closed)
Low No Off Off Off Off
Off
(open)
On
(closed)
Off
(closed)
Off
Off
(closed)
Low Ye s C ool On Off Off
Off
(open)
On
(closed)
Off
(closed)
Off
Off
(closed)
High Ye s Reheat1 On On Off
On
(closed)
Off (open)
Off
(closed)
On
Off
(closed)
High No Reheat2 On On On
On
(closed)
Off (open)
On
(open)
On On (open)
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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