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Carrier 30AWH004HB / 30AWH006HB / 30AWH008HB / 30AWH012HB. Service Manual - page 4

30AW

Inverter control size 012NX

Electrical connections

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30AW

GMC control size 012NX

Electrical connections

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30AW

Inverter control size 015HB

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30AW

GMC control size 015HB

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30AW

Inverter control size 015XB

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30AW

GMC control size 015XB

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30AW

Control management

GMC controller

Inverter controller

30AWH012_
30AWH015_

30AWH004_
30AWH006_
30AWH008_

Wired remote (RC1)

Code: 33AW-RC1_

Wired remote (CS1)

Code: 33AW-CS1_

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30AW

Control management

5.1 Introduction

5.2 Unit Control

USER INTERFACES

GMC CONTROL

INVERTER CONTROLLER

Users can select the desired operating

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Control is based on the GMC platform developed by Carrier. For the
30AWH AquaSnap PLUS inverter chiller / heat pump a new GMC board
has been developed as well as new algorithms have been implemented.
The GMC control elaborates the request from the user interface and
translates it into a message for the chiller unit control. It continuously
analyzes the water, indoor ambient conditions and the customer
requests sending updated signals to the chiller unit control.
The chiller unit control takes care of the system reliability and satisfies

The main flow of logic in this control is as follows: The control reads
in inputs from discrete inputs, analog inputs, communications. These
inputs are then processed by mode control. After the mode control
comes the protections that protect the unit from damage. After the
protections, the outputs are energized or de-energized. Then the loop
repeats itself.
High voltage communications is used to communicate from the GMC

the requests coming from Inverter control tuning chiller unit fan, PMV,
compressor.
The chiller unit control continuously sends back signals to the Inverter
control.

board to inverter control.
Maximum values are maximum compressor frequency allowed unless
limited by a protection or message received from the User Interface.
The User Interface can limit the maximum compressor frequency from

A2W

Size

Inverter

Capacity

(kW)

GMC Control

returned to Inverter

(HP)

Minimum

Cooling

(Hz)

Maximum

Cooling

(Hz)

Minimum

Heating

(Hz)

Maximum

Heating

(Hz)

1,25

1,75

10,2

100

10,2

104

10,2

104

10,2

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30AW

Control management

When power supply is reset

Fail Mode

Anti Freeze Protection in Off Mode

When a unit is powered up, depending on its Auto Start configuration, it will start up with its last operating parameters, or
OFF Mode.

The EEPROM is available for saving the operating environment of the control in the event of a power-reset condition. If not
configured for auto start, at the power up the system will remain in OFF Mode.

All the NUI codes will be restored on a power up condition.

When the unit has a diagnostic failure, fail mode is executed.

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case of not recoverable error and Water pump remains energized. In addition and if connected, the same message code
will be sent to NUI and, as an alternative, the alarm relay output should be activated as defined.

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that can also select the Antifreeze Temperature. An hysteresis of - 0°C /+2°C should be applied.

AF:

Anti-

Freeze
NUI Code 2

HOME

ANTIFREEZE

STATUS

CHILLER

UNIT: OFF

WP: OFF after

35 sec. if

was ON

NUI: OFF

Mode: ON Heat

WSP: 35°C

WP: ON

NUI: Display Antifreeze

CHILLER UNIT: OFF

WP: OFF after 30 sec. if

was ON

NUI: OFF + Antifreeze

START

Disable

enable

T< AF Value

T AF Value

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Control management

Operating mode selection

The operating mode is selected based on the command chosen by the remote control.

Cooling Mode

Depending by the system configuration and when the operating mode is cool, the system could operate as follows:
With Comfort NUI (CS1).
With SUI (RC1) / Dry inputs.
The WSP (Water Set Point) will be defined as follow:

- Fixed WSP: as per the appropriate variable value (Standard and Eco)
- Climatic Curve depending by OAT (see the controls manuals and the paragraph 7.3.5 )

For more information about the cooling mode logics used to determine the WSP, refers to the SUI or NUI manuals.

Heating Mode

Depending by the system configuration and when the operating mode is Heat, the system could operate as follows:
With Confort NUI (CS1).
With SUI (RC!) / Dry inputs

The WSP will be defined as follow:

- Fixed WSP: as per the appropriate variable value (Standard and Eco)
- Climatic Curve depending by OAT (see the controls manuals and the paragraph 7.3.5 )

Off Mode

If the Operating Mode is OFF then:

- All outputs must be de-energized except those turn on by protections.
- Send Forced OFF Message to the unit
- Water pump is de-energized AFTER 30 SEC.
- Antifreeze and all protections algorithms will be always operative
- Sanitary Hot Water management in OFF mode is based on code 153 (1: always active 2: active only in HTG or CLG

mode)

In case of User Interface is Simple User Interface (dry contacts). The code 100 must be 0 or 1 & code 101 must be 0.

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Cooling mode and in SHW demand. Every time the compressor turns on a timer restarts to count the Compressor Run
Time (CRT).

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- If CRT < 18 minutes the compressor frequency is progressively reduced from the current to the
minimum value until CRT >18 minutes.

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OAT:

Outdoor

Air
Temperature

WSP:

Water Set Point

Compressor Frequency Calculation

- When the Frequency reduction mode is activated through the NUI Bus, RS 485 bus or Limitation Frequency Input, the

max compressor frequency

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- When the Unit Mode is OFF, the unit operates in cool/heat satisfied mode with a compressor frequency of zero, F(n) =0.

Calculating Frequency

The calculated water temperature exiting exchanger and calculated set point are continuously monitored. The frequency
is calculated on the values of LWT and WSP. If the leaving water temperature changes causing a positive delta or if the
calculated set point changes, a normal demand calculation is performed every 90 seconds (60 in heat mode). Now the
frequency is calculated on the values of E(n) and ΔE(n).

Demand vs. Satisfied

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max (Fhmin, F(n)) ) , and demand calculations execute every 90 (60 in Heat mode)

seconds.

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- When the compressor is on send the Cool/Heat Demand message to the unit.

Water pump is always energized

LWT:

Leaving water

temperature

WSP:

calculated water
set point

F(n):

frequency

sent to the
unit, clamped
between zero
and Fcmax

E(n)=

LWT- WSP

E(n):

E(n-1)-E(n)

Fcmax:

maximum com-
pressor
speed allowed
in cooling

Fcmin:

minimum
compressor
speed allowed
in cooling

Fhmax:

maximum
compressor
speed allowed
in heating

Fhmin:

minimum
compressor
speed allowed
in heating

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Control management

Dehumidifier activation (X and H terminal block pins 11 – N)

Compressor Short Cycling Protection (Timeguard)

Minimum Compressor Run Time

Water Freeze Protection

External dehumidifier source is based on NUI Relative Humidity value, (For this feature is necessary install 33AW-CS1
interface).
Two codes shall be accesses through NUI:
Code 108:
It is for defining availability of external dehumidifier.

1 = Alarm or Defrost
2 = External Dehumidifier activation

Code 107:

- It is Relative Humidity Limit value to activate the heat source.
- If Relative Humidity is higher than Humidity Limit, Output PINS 11-N must be forced ON and display dry mode icon on

NUI.

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Protections are activated based on operative Mode.

NUI code 108
and 107

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seconds. During that time F(n) = 0, and a Cool Satisfied or Heat Satisfied message is sent to the Unit depending on the
mode.

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last on cycle was shorter than 10 minutes. (The maximum number of cycles for hours is six).

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Water Pump remains always ON during Timeguard.

For reliability purposes this algorithm forces the compressor to run for a minimum amount of time.

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This protection is ignored when:

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6TFSSFRVFTUTUIFVOJUUPUVSOPò

- A/C Power Interruption
- A mode change occurs
- 20 second loss of high voltage communications
- High temperature protection

When the water starts gets too cold, there is the risk of freezing in the heat exchanger.
Certain actions are taken to prevent freezing.
This protection starts if TR or Tw go down particular values as per conditions below.

While in Zone N or H the frequency can’t increase.
While in Zone M the frequency is forced to decrease until Fcmin.

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Tw:

Min(Actual
Water
Temperature
Entering,
Actual Water
Temperature
Exiting)

Fr(n):

real frequency
from the Unit

Fcmin:

minimum
compressor
speed allowed
in cooling

TR:

Refrigerant
temperature

Compressor OFF

4 °C

2 °C

5 °C

-5 °C

-7 °C

-3 °C

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Control management

High Temperature Protection

Anti frost protection

A/C Power Interruption

Envelope Limitation Protection

When the water starts to get to hot, this is a sign that the pressure in the system is increasing.
Certain actions are taken to decrease the pressure.

While in Zone N or L the frequency can’t increase.
While in Zone M the frequency is forced to decrease until Fcmin.

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Tw:

Max(Actual
Water
Temperature
Entering,
Actual Water
Temperature
Exiting)

Tr:

Actual

Refrigerant
Temperature

Fr(n):

real frequency
from the chiller
unit

Fhmin:

minimum
compressor
speed allowed
in heating

This function shall run when the unit is manually stopped or shutdown due to alarm. It shall protect the water exchanger
against freezing risk because of low outside temperature conditions.
The following logic shall be used:

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o Trace Heater (first intervention) (when installed).
o Water Pump (second intervention)

P6OJU0OJO)FBU.PEF BOE5)0ò

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P6OJU0ò BOE5)0O
P8BUFS1VNQ0ò
P5SBDFIFBUFS0ò

DELTA SP:

NUI CODE

109

WP:

Water Pump

TH:

Trace heater

HP:

Heat Pump

OAT:

Outdoor Air

Temperature

EWT:

Enter Water

Temperature

LWT:

Leaving Water

Temperature

This algorithm handles the case of losing A/C line cycles.

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cool satisfied or heat satisfied until time guard expires.

This function limits frequency based on a combination of OAT and LWT, in order to guarantee the unit envelope. The

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HEATING
-20 °C ≤OAT≤30 °C
20 °C≤LWT≤60 °C

COOLING
0 °C ≤ OAT ≤ 46 °C
4 °C ≤ LWT ≤ 18 °C

For more details see par 2.4 Operation Limits
When the OAT and/or LWT values are out of these limits the Aquasnap unit doesn’t stop but it works in particular
conditions in order to preserve the compressor (frequency and for uptime limitation).

OAT:

Outdoor Air

Temperature

LWT:

Leaving Water

Temperature

Threshold A

[(EWT or LWT < (DELTA SP + 4°C))]

OFF

Threshold B

[(EWT or LWT < (DELTA SP + 3°C))]

OFF

Threshold C

[(EWT or LWT < (DELTA SP + 2°C )]

OFF

Threshold D

[(EWT and LWT > (DELTA SP + 5°C)]

OFF

Compressor OFF

61 °C

60 °C

62 °C

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30AW

Control management

Unit Status and Defrost output or Tair Setpoint status

Based on the NUI code 147 set-up, the Output J7 Pin 2 (N-5 on the terminal block) could play for one of these Functions:

- ALARM: The intent of this output is to point out the alarm condition. This signal could be
used by an external control to verify if the Unit is able to operate with the requested function.
- Tair SETPOINT STATUS: The intent of this output is to give signal to a potential Fan Coil System when the T ambient

set-up measured by the NUI is reached. A hysteresis of +1°C / – 1°C is used. This signal could be used like a window
contact by the Fan Coil to stop the fans and/or the water valves.

NUI code 147

Sanitary water Input and 3 Way Valve Output

The combination of the Sanitary Water Inputs and Outputs should be able to manage an external Sanitary Water Boiler
and this is the logic that is driving this function:

- When an external Sanitary Water Boiler needs hot water from the units, it close the dry contact Pins 13-15 on the

terminal block.

- The routing that is always running in order to verify Input changes detect this need and the unit mode, whichever

it is the current status, become in HEAT mode at the max allowed WSP admitted as per the Enveloped Limitation
protection.

- In case of no alarm or defrost is active, the 3 Way Valve Output (pins N-10-18 on terminal block) become ON while, vice
versa, this output is always OFF in case of alarm and/or Defrost
- In addition, the NUI, if available, will display the relative Icon.

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or Cool Mode the SHW logic is always actives.

NOTE: when SHW is ON, EHS is always OFF

SHW:

Sanitary

Hot Water

EHS:

External

Heat Source

WSP:

water set-point

NUI code 153

Water Pump On / Off Management

The water pump should be always ON apart if any alarms are active or if the unit is in OFF mode (selected or forced by the
unit itself ).
When the system turn OFF the water pump must be ON for additional 30 seconds.

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for few seconds increases the life time of the pump.

If OAT < temperature set in code 148
The main water pump activation depending by the code 155 (0. always ON, 1. always OFF or 2. ON/ OFF depending by
EHS)

SHW:

Sanitary

Hot Water

EHS:

External

Heat Source

NUI codes 148,
155

Additional water Pump On / Off Management

The management for the additional water pump, linked to the pin 12 on the X and H terminal block, is the following:

If OAT > temperature set in code 148
The additional water pump activation depending by the code 156

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If OAT < temperature set in code 148
The additional water pump activation depending by the code 157 (0. always ON, 1. always OFF or 2. ON/ OFF depending
by EHS)

SHW:

Sanitary

Hot Water

EHS:

External

Heat Source

WP:

Water

Pump

ADD WP:

Additional
Water Pump

NUI codes 148,
156, 157

Flow Switch Protection

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1VNQXJMMCFGPSDFE0OPS0òBTQFSøPXTXJUDIPVUQVU

- If flow switch contact is open (no water flow) Unit and WP turn OFF.
- The system retries to start for 5 times before displaying alarm.

The compressor is allowed to turn on if requested to when the water is flowing through the heat exchanger (flow switch
contact OFF) and timeguard has expired.

Settings:
Size 4kW = 300 l/h
Other Sizes = 420 l/h

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30AW

Control management

Backup External Heat Source functionality

(X and H terminal block pins 5 – N)

This functionality is valid when user mode is HEATING MODE.
Between pins 5 and N of terminal strip (see paragraph 4.1) an output is available (1 ph ~ 230V, 2A max) to activate a
backup external heat source (such as Electric Heater or Boiler).
This functions is activates using the NUI.
NUI Codes for this function:

106: 1 for External heat source (2 for Defrost Output)
148: OAT limit for External heat source (-20°C / +65°C)
150: Auxiliary OAT limit. This code is defining the EHS threshold value under witch both HP and EHS will be operative as

per algorithm. (-20°C / +30°C)

151: Auxiliary Delay. Delay time before switching the back-up EHS ON min. (1 min / 60 min)
152: Auxiliary Hysteresis. Delta T needed to activate the Auxiliary Heater. (1°C / 20°C)
153: SHW in OFF MODE. This code is defining if, when System mode is OFF, the SHW logic can be activated.
154: EHS OUTPUT. This code is defining the EHS output status when EHS is activated and OAT<Code 148
155: Main water pump vs EHS OAT. This code is defining the water pump logic when EHS is activated and OAT<Code 148
156: Additional WP vs SHW (0 Trace heater Output active)
157: Additional WP ( X and H terminal block pins 12 – N)

If code 148 < OAT < code 150:

When LWT is below the water set-point minus the auxiliary hysteresis (code 152) starts the EHS timer (A). When the set delay
(code 151) is passed (B) the External Heat Source turns ON and the HP is regulated at the max frequency. The EHS turns
OFF when the LWT reached the water temperature set point (C) (EHS timer is set to 0). The additional water pump will be
activated depending by main water pump (always ON if main water pump is ON) and by the code 156 (ON or OFF as per SHW
activation).

If OAT < code 148:

The HP turns OFF (frost protection is active)
The EHS turns ON/OFF depending by setting of the code 154 (Always ON, Based on Room temperature or Water
Temperature).
The main water pump activation depending by the code 155 (always ON, always OFF or depending by EHS status)
The auxiliary water pump activation depending by the code 157 (always ON, always OFF or depending by EHS status)

NOTE:

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the above strategies based on OAT value.
In case of EHS installation it is mandatory to install a thermal switch on the water circuit to protect the system from too high
water temperatures. This protection item has to be located Immediately downsteam the EHS (according to local/national
legislations).

SHW:

Sanitary Hot

Water

EHS:

External Heat

Source

HP:

Heat Pump

OAT:

Outdoor Air

Temperature

WP:

Water Pump

NUI Codes
106, 148,
150, 151,
152, 153,
154, 155,
156, 157

OAT < T set in CODE 148

Water Temperature Set-point

Indoor Temperature Set Point

OFF

CODE 151

0=Always ON

1=ON/OFF based
on room T

OFF

2=ON/OFF based
on WSP

OFF

0=Always OFF

1=ON/OFF based
on EHS ON/OFF

2=Always ON

0=Always OFF
1=ON/OFF based
on EHS ON/OFF

2=Always ON

E 152

Auxiliary Hyst

HP System mode

OFF

Frost protection

OFF

EHS timer

OFF

AUX Delay

EHS OUTPUT

CODE 154

OFF

As per standard logic

Depending by EHS ON/OFF

T set in CODE 148 < OAT < T set in CODE 148

ADDITIONAL

WATER PUMP

CODE 157

OFF

Depending on main water pump or, when SHW is active, by

CODE 156

Depending by EHS ON/OFF

Max Frequency

OFF

MAIN WATER

PUMP

CODE

155

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30AW

Control management

System Diagnostics

Output test

Pulse Modulating Valve [PMV] control (cooling and heating operation)

The control contains diagnostic tests to verify the integrity of the system.
The On Board LED is located on the circuit board. It is used to display normal operation status and diagnostic fault code
information.
The control board status LED will flash at a rate of one (1) second ON and one (1) second OFF while the control is operating
normally.
When in a diagnostic fault code, it will blink out the fault code.
Once a failure occurs, the system is considered failed. The failure could be recoverable or not. The lowest diagnostic number
that is active will be the fault code that is displayed.

When a diagnostic is active the onboard LED will blink the fault code out. The sequence will be 4 seconds with the onboard

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fault code is less than 10 the delay will be 6 seconds between onboard LED flash sequences.
Fault Codes associated with diagnostic will be available through communications.
Fault code 14 and 8 shall be give top priority and shall by pass other fault codes. Fault codes priority order shall be the same
as in the given below table in absence of Fault codes 14 and 8.

SUI Alarm:

When any diagnostic is active and in case SUI is connected, SUI Alarm LED shall blink as just the same way as Onboard LED. In
absence of diagnostics SUI Alarm LED shall remain OFF.

Fault codes on NUI:

Main Board shall communicate the diagnostic with NUI. User or Installer can view these fault codes through an entry into
User settings mode or Installer settings Mode and scroll to the fault code as mentioned in the Variable table. NUI shall scroll all
the active fault codes. In absence of diagnostics, NUI shall display blank. NUI shall also manage to store the latest 4 fault codes
and Installer can view this value by scrolling to Fault code History parameter.
For more information about the fault code on controls NUI and/or SUI refer to their specific manuals.
For specification of fault code refer to the specific paragraph:

i(.$BMBSNDPEFTw

Recoverable:

self healing
diagnostic

Not
Recoverable:

Must cycle
power up to the
unit to fix the
system.

This test will be used by the Installer to test and/or to force ON the outputs, setting the code 104 on the NUI:

NUI Code 104

0. No test
1. Water pump
2. Alarm / Ambient temperature reached
3. External Heat Source / Defrost

4. Alarm + defrost / Humidity
5. Trace Heater / Additional Water Pump
6. 3 Way Valve
7. SUI Alarm
8. N.A.

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Pulse Modulation Valve is a refrigerant bi-flow electronic expansion device driven by a stepper motor.
It’s use to optimize refrigerant superheating and avoid refrigerant liquid back into the compressor.
1) The PMV is controlled with 50 to 500 pulses during the operation, respectively.

5IF1.7JTDPOUSPMMFEVTJOHUIFUFNQFSBUVSFEJòFSFODFCFUXFFO

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UFNQFSBUVSFEJòFSFODFGSPNUP,

3) During max loading conditions, the refrigerant circuit pressures & temperatures can increase excessively, so the PMV is
controlled by the TD sensor.

TS:

Suction

temperature

TR:

Refrigerant
temperature

TE:

Entering

(in Heat
exchanger)
temperature

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30AW

Control management

Discharge temperature release control

Current release control

1) This function controls the compressor frequency, when the discharge temperature has increased due to max load
condition or during PMV control. It subdivides the frequency control up to a unit of 0.6 Hz to stabilize the cycle.
2) When the discharge temperature is detected in an abnormal stop zone, the unit stops the compressor and restarts it after
2 minutes, 30 seconds (time guard). The error count is cleared when operation of 10 minutes without error occurs. If the
abnormal stop zone has been detected 4 times without clearing, an error code is displayed.
* Possible causes include excessive amount of refrigerant, defective PMV, or blockage in the refrigeration cycle.

30AWH004

117

112

108

105

30AWH006

117

112

108

105

30AWH008

117

107

103

100

30AWH012

111

106

100

30AWH015

111

109

106

103

TD:

Discharge

temperature

The output frequency and the output voltage are controlled by AC current detected on the P.C. board.
The max current value of the inverter are shown in table below.

Frequency down

Frequency holding

Frequency slow-up
(Based on command)

As command

Error stop ("P03" displayed after 4 error counts)

TD[

Frequency down

Hold

Normal operation

[A]

l1 value [A]

COOL

HEAT

30AWH004

6.3

30AWH006

8.5

10.8

30AWH008

10.1

30AWH012

30AWH015

14-03-2011 14:45:11

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