Carrier 60 Service Manual download pdf (Page 26)

2-5

T--295

2.4.2 Control

NOTE

1 This procedure should be performed by an

HVAC technician who has been trained on

Carrier Model GR system design. Control

configuration is preset by the manufacturer

and resetting of the parameters should not

berequired.ItisrecommendedthatCarrier

Service or Engineering is contacted before

any control configuration is changed.

Carriercannotberesponsibleforfailuresor

damage resulting from unauthorized

changes.

2 If a replacement L ogic Module is installed,

it is necessary to match the configuration

jumpers (see Figure 1-10) to the original

board. Refer to paragraph 4.24.

a. Turn the A/C main power switch (located in the driv-

er’s area) to OFF.

b. Connect the Micromate to the service port located in

the return air section.

c. Unplug the logic board connector J3.

d. Turnthe A/Cmain power switchbackto the ONposi-

tion.

e. Activate the system by pressing the 1/0 key on the

Micromate panel.

NOTE

Be sure to reconnect J3 when testing is com-

pleted or the system will fail to operate when

the Micromate is disconnected.

NOTE

When modifying the setpoint temperature for

diagnostic purposes, be sure to reset the set-

point when testing i s complete.

2.4.3 Diagnostic Mode

Diagnostic mode can be entered by pressing the up and

down arrow keys simultaneously for 5 seconds.

Diagnostic mode allows alarms and system parameters

to be viewed. If there are any alarms stored, the most

recent alarm will be shown. To view additional alarm

information, refer to section 3. Press the up and down

arrow keys to view parameters.

2.4.4 System Parameters

Pressing the up/down arrow keys will allow the user to

scroll up or down through the parameters. If no key is

pressed for 30 seconds this mode is exited and the

display will revert back to the default display. Pressing

the on/off key any time will exit this mode and the

display will again indicate the default. The parameters

are shown in Table 2-3. When scrolling through the

parameters, the current parameter will be displayed for

two seconds. After two seconds, the display will show

the data for the current parameter. When the l ast

parameter is reached, the list will wrap back to P1.

2.4.5 Test Mode

With the system in normal operation,the controllermay

be placed in the test mode, by doing the following:

a. Enter the diagnostic mode by pressing the up and

downarrow keyssimultaneously for5 seconds. Enter

the test mode by pressing the COOL key five times.

b. In the test mode, the display will read “T##” where

“##” indicated the test number that is currently run-

ning.

c. The initial indication will be “T00”. This indicates

the controller is in the test mode and all relays arede--

energized. Press the arrow keys to scroll through and

perform each test When the highest test number is

reached, the display will increment back to the lowest

test number. A listing of tests is provided in

Table 2-2.

d. To terminate testing, press the I/0 key.

Table 2 -2. Controller Test List

TEST

OUTPUT STATE

T00 All Relays Of f

T01 Evaporator High On

T02 Evaporator Low On

T03 Condenser High On

T04 Condenser Low On

T05 Compressor On

T06 Unloader Valve 1 On

T07 Unloader Valve 2 On

T08 Fresh Air Damper On

T09 Heat On

T10 Fault On

T11 Boost On

T12 Spare/Motor Input On

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 55 56

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Carrier 60 Service Manual Page 26

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