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Parameters - XR160C – XR170C – XR162C – XR172C

XR160D –

XR170D Controllers with forced defrost & fan delay

Use fold out programming flow chart inside front cover

Parameter &

Label

Description Range Pr1

Pr2

Factory

Default

SP Set Point Sets the temperature at which the compressor stops LS to US Pr1 - 5 c

HY Differential Sets the number of degrees above Set Point at which the compressor

is re-started

0∃ 2 °÷ 12∃ 0 c

Pr1 2 c

LS Lower Set

Point Limit

Sets the lowest temperature to which the customer can adjust the Set

Point

- 57 c ÷

Set Point

Pr2 - 30 c

US Upper Set

Point Limit

Sets the highest temperature to which the customer can adjust the Set

Point

Set Point ÷ 99 c

Pr2 20 c

AC Anti Short

Cycle

Sets the minimum time period between the stopping of the

compressor and it’s next possible restart

0 ÷ 30 mins.

Pr2 1 min.

ALC Alarm

Configuration

Configures the alarm either to absolute temperatures or

to be relative to the Set Point ( i.e. so many degrees

above & below Set Point ) If “Relative”, when the Set Point is

altered the alarm levels will follow it

Note: (Only for XR150C with alarm relay):-

0 & 1 – Muting buzzer de-activates alarm relay

2 & 3 – Muting buzzer leaves alarm relay activated

0=Relative

1=Absolute

2=Relative

3=Absolute

Pr2 0

ALU Alarm

Level Upper

Sets the high temperature alarm level. If ALC=0 it sets how many

degrees above Set Point. If ALC=1 it sets a fixed alarm temperature.

Set Point ÷ 99 c

Pr2 10 c

ALL Alarm

Limit Lower

Sets the low temperature alarm level. If ALC=0 it sets how many

degrees below Set Point. If ALC=1 it sets a fixed alarm temperature.

-57c ÷ Set Point

Pr2 10 c

Ald Alarm Delay Sets the time delay between a temperature alarm condition being

sensed and the alarm being signaled during normal operation.

0 ÷ 120 mins.

Pr2 15 mins.

dAO Alarm

Delay at Start Up

Sets the initial temperature alarm delay time on start up so avoiding

unnecessary alarms during pull down.

0 ÷ 720 mins.

Pr2 90 mins.

Ods Delay of

Outputs on Start

Sets the time delay between the power to the controller being turned

on and any output relay starting to operate. This can be used to

prevent short cycling of the compressor following a momentary

power failure.

It can also be used to stagger the re-start of multiple units following a

power failure, to prevent everything trying to start at once and

blowing a fuse.

0 ÷ 120 mins.

Pr2 1 min.

CCt Fast Chill /

Freeze

The controller has a thermostat override facility. This parameter sets

the override time during which the compressor will run continuously

irrespective of the temperature. Setting time to 0 to disables this

function

0 ÷ 990 mins.

Pr2 240 mins

dAF Delay of

Defrost after fast

chill

Sets the period of time following a thermostat override after which

the controller will go into a defrost. The controller will then resume

normal operation

0 ÷ 120 mins.

Pr2 120 mins.

IdF Interval

Between defrosts

Sets the interval time between the start of successive defrosts

1 ÷ 120 hours

Pr2 6 hours

dSd Delay start

of defrost

When a defrost is due to commence ( after the IdF time), this

parameter adds a period of time during which the start of defrost is

delayed. Used to stagger defrosts between multiple controllers

0 ÷ 59 mins

Pr2 0 mins.

dF Length

Of Defrost

Sets the maximum duration time of the defrost

0 ÷ 120 mins.

Pr2 30 mins.

dtE Defrost

Termination

Temperature

Sets the evaporator temperature at which the controller will terminate

the defrost. This temperature is sensed by the evaporator probe.

- 57 ÷ 50 c

Pr2 8 c

dFd Display

During Defrost

This tells the controller what to display during defrost.

0 = Actual temperature, 1 = Temperature at start of defrost,

2 = Set Point, 3 = “DEF” label

Pr2 1

dAd Max display

after Defrost

After defrost, the temperature as it was at commencement of defrost

is displayed. Normal display is resumed once the actual temperature

drops below this point or the time set in this parameter has expired

0 ÷ 120 mins.

Pr2 30 mins.

tdF Defrost Type Configures the controller for defrost by electrical heaters or hot gas.

If set for hot gas, the compressor is kept running during defrost.

* Settings 2 & 3 are for special applications only. Refer to

manufacturer’s manual

0=Electrical

1=Hot Gas

2=*

3=*

Pr2 0

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 40 41

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Emerson Universal-R Manuel d'utilisateur Page 13

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