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HVAC26A Air Conditioner Controller

SPLat will be shutdown for the Christmas Holiday season from Thursday 20 December 2018 thru Sunday 6 January 2019. We will check emails periodically and will continue to process orders but at a slower pace. Santa hat
2-stage air conditioner controller replaces apac CA20

New HVAC26A, the CA20 replacement

APAC CA20

Original APAC CA20

HVAC26A controller is an advanced microprocessor based controller for 2 stage air conditioning units. It is a direct pin and size compatible replacement for the CA20 and comes preloaded with compatible control software. The use of latest FLASH based microprocessor technology has meant that additional functionality has been included whilst keeping costs down. This has also resulted in a design utilising fewer components, improving reliability.

To reduce wiring, all but the compressors are directly controlled by on board relays and most connections are plug in for ease of manufacture and service. As much of the control wiring as possible has been included on the board to further reduce manufacturing labour.

To prevent incorrect wiring, all connectors on the PCB are have differing numbers of pins or connector style, hence no two connectors are the same.

The controller is part of an intrinsically safe overall system. The safety interlock sensors/switches act directly by interrupting the 24 VAC power to the various control outputs, regardless of the microprocessor control. A relay on each stage bypasses the low-pressure switch contact to prevent nuisance fault tripping during defrosts. On-board fusing is also provided for both the control circuits and the thermostat 24 VAC supply.

As an improvement on the CA20, the HVAC26A has an integral 2 line by 16 character LCD display that is programmed to show operating status information and fault status. Two buttons provided on the board allow service personnel to access status and fault history information. Faults are remembered, even if the power to the controller is interrupted and can be read out by a technician to aid in fault finding. The fault history can also be cleared so that only the latest fault history is available at the next service visit.

The board has four option links to allow selection of the defrost time, enable lead/lag operation and enable system speed up to aid in fault finding.

In addition, the board has an expansion port to allow for future expansion interfaces, such as a BMS interface, data logging, internet access, extra I/O etc.

The HVAC26A has the following features:

For menu type applications, the user can choose to edit and store the operating parameters in the UI or on the master controller.

We have published some guides to help with troubleshooting this controller:

Block Diagram | Troubleshooting | Operating Manual

The software version in the controller determines it's behaviour. Both CA20 and HVAC26A controllers show the software version number when power is switched on. If you need an identical replacement, take note of the version number that's displayed then order one of the units listed below. They all have the same price.

HVAC26A
HVAC26A (C2.2)
2 Stage, 2 outdoor fan, reverse cycle, R22 refrigerant commercial air conditioner controller (CA20 replacement). Version C2.2. This is our most commonly used model.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

tp11027
TP11027
Thermistor, Stage 1 sensor for HVAC controllers, 2pin, 4m lead
  • 1 - 4AUD17exGSTUSD≈13
  • 5 - 9AUD16exGSTUSD≈12
  • 10 - 24AUD14exGSTUSD≈11

Shipping weight:
27g / 1oz

tp11028
TP11028
Thermistor. Stage 2 sensor for HVAC controllers, 3pin, 4m lead
  • 1 - 4AUD17exGSTUSD≈13
  • 5 - 9AUD16exGSTUSD≈12
  • 10 - 24AUD14exGSTUSD≈11

Shipping weight:
27g / 1oz

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HVAC26A (D1.1)
2 Stage, 1 outdoor fan, reverse cycle, R22 refrigerant commercial air conditioner controller (CA20 replacement). Version D1.1.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (F1.0)
2 Stage, 2 outdoor fan, cooling only, R22 or R407C refrigerant commercial air conditioner controller (CA20 replacement). Version F1.0.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (E1.0)
2 Stage, 1 outdoor fan, cooling only, R22 or R407C refrigerant commercial air conditioner controller (CA20 replacement). Version E1.0.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (C2.8)
2 Stage, 2 outdoor fan, reverse cycle, R22 refrigerant, stage 1 & 2 of 4 stage commercial air conditioner controller (CA20 replacement). Version C2.8.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (L2.7)
2 Stage, 2 outdoor fan, reverse cycle, R22 refrigerant, stage 3 & 4 of 4 stage commercial air conditioner controller (CA20 replacement).
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (P2.2)
2 Stage, 2 outdoor fan, reverse cycle, R407C refrigerant commercial air conditioner controller (CA20 replacement). Version P2.2.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (J1.1)
2 Stage, 1 outdoor fan, reverse cycle, R407C refrigerant commercial air conditioner controller (CA20 replacement). Version J1.1.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (A2.8)
Stage 1 & 2 of 4 stage commercial air conditioner, 2 outdoor fan, reverse cycle, R407C refrigerant. Version A2.8. (CA20 replacement when both controllers are HVAC26A types). See H2.7 for companion stage 3 & 4 controller.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (H2.7)
Stage 3 & 4 of 4 stage commercial air conditioner, 2 outdoor fan, reverse cycle, R407C refrigerant. Version H2.7. (CA20 replacement when both controllers are HVAC26A types). See A2.8 for companion stage 1 & 2 controller.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (T1.0)
Stage 1 & 2 of 4 stage commercial air conditioner, 2 outdoor fan, Cooling only, R22/R407C refrigerant. Version t1.0. (CA20 replacement when both controllers are HVAC26A types). See y1.0 for companion stage 3 & 4 controller.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz

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HVAC26A (Y1.0)
Stage 3 & 4 of 4 stage commercial air conditioner, 2 outdoor fan, cooling only, R22/R407C refrigerant. Version y1.0. (CA20 replacement when both controllers are HVAC26A types). See t1.0 for companion stage 1 & 2 controller.
  • 1 - 4AUD323exGSTUSD≈245
  • 5 - 9AUD234exGSTUSD≈178
  • 10 - 24AUD223exGSTUSD≈169

Shipping weight:
330g / 11.6oz