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Johnson Controls Unitary Products 501062-UAI-A-0909

OPERATION INSTRUCTIONS

DEMAND DEFROST CONTROL BOARD MODEL 340512/031-09178-000A

FOR USE WITH MODELS: AFFINITY, ECHELON, ACCLIMATE HEAT PUMP SERIES

FIGURE 1: Demand Defrost Control Module

ANTI-SHORT CYCLE DELAY

The control includes a five-minute anti-short cycle delay

(ASCD) timer to prevent the compressor from short cycling after

a power or thermostat signal interruption. The ASCD timer is

applied when the control is first powered from the indoor unit

thermostat and immediately following the completion of a com-

pressor run cycle. The compressor and the outdoor fan will not

operate during the five minutes that the timer is active.

The ASCD timer can be bypassed by connecting the TEST ter-

minals for three seconds while the thermostat is calling for com-

pressor operation (Y1 input signal energized).

LOW VOLTAGE DETECTION

The control monitors the transformer secondary (24 VAC) volt-

age and provides low voltage protection for the heat pump and

its components. In particular, the control prevents contactor

chatter during low voltage conditions. If the voltage drops below

approximately 19 VAC, the control will continue to energize any

relays that are already energized but will not energize any addi-

tional relays until the voltage level increases. If the voltage

drops below approximately 16 VAC, the control will immediately

de-energize the relay outputs and will not energize any relays

until the voltage level increases. The control will store and dis-

play the appropriate fault codes when low voltage conditions

occur.

CRANKCASE HEATER

The control energizes the crankcase heater terminal (CCH)

whenever line voltage is applied to the control and the outdoor

fan is not on. If the compressor is equipped with a crankcase

heater, it will be energized from the CCH terminal of the control.

TEST INPUT

The control includes a TEST input connector that can be used

for various testing functions during installation and service. The

TEST input connector is shown in Figures 1 & 2. The following

table summarizes the behavior of the control when the two

TEST pins are connected.

FIGURE 2: Jumper Inputs

1 2 3 4 5 6 ... 13 14

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Strany 1 - OPERATION INSTRUCTIONS

Johnson Controls Unitary Products 501062-UAI-A-0909OPERATION INSTRUCTIONSDEMAND DEFROST CONTROL BOARD MODEL 340512/031-09178-000AFOR USE WITH MODELS:

Strany 2

501062-UAI-A-090910 Johnson Controls Unitary ProductsThe temperatures shown on the side of the connector labeledLTCO are the LTCO temperature options.

Strany 3 - Wiring Related Fault Codes

501062-UAI-A-0909Johnson Controls Unitary Products 11Auxiliary Heat Defrost Operation – Air Handler ModeThe control will energize W1 Out 30 second pri

Strany 4 - LOCKOUT MODES

501062-UAI-A-090912 Johnson Controls Unitary ProductsBonnet Sensor – Fossil Fuel ModeThe heat pump may be equipped in the field with an optionalindoor

Strany 5 - DEFROST OPERATION

501062-UAI-A-0909Johnson Controls Unitary Products 13HIGH-PRESSURE SWITCH FAULTThe heat pump is equipped with a high-pressure switch that isconnected

Strany 6 - INITIATE CURVE

Strany 7

501062-UAI-A-09092 Johnson Controls Unitary ProductsLED DIAGNOSTIC INDICATORSThe control includes two LED’s that display various types ofdiagnostic in

Strany 8

501062-UAI-A-0909Johnson Controls Unitary Products 3The heat pump control informs the homeowner of the type ofcondition that is present using flash co

Strany 9 - BALANCE POINT (BP)

501062-UAI-A-09094 Johnson Controls Unitary ProductsFAULT CODE MEMORYDisplaying Stored Fault CodesThe control will store up to five fault codes in mem

Strany 10 - FOSSIL FUEL JUMPER (FFUEL)

501062-UAI-A-0909Johnson Controls Unitary Products 5Wiring or Setting Related LockoutsThe control will not operate the compressor when the followingfa

Strany 11

501062-UAI-A-09096 Johnson Controls Unitary ProductsCOOLING OPERATION (Single-Stage Heat Pump)During cooling operation, the control will receive therm

Strany 12 - SWITCH POINT

501062-UAI-A-0909Johnson Controls Unitary Products 7A thermostat call for first stage cooling (Y1+O) that has durationof less than 10 minutes.• Recycl

Strany 13 - SENSOR (OPTIONAL)

501062-UAI-A-09098 Johnson Controls Unitary ProductsWhen the ten-minute timer expires, the control will measure theliquid line temperature and determi

Strany 14 - Norman, OK 73069

501062-UAI-A-0909Johnson Controls Unitary Products 9The control will no longer force two-stage compressor when allof the following conditions are true

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