Carrier 50HCQA Installation Manual download pdf (Page 12)

SERVICE TEST

The Service Test function can be used to verify proper operation of

compressors, heating stages, Humidi--MiZert System, indoor fan,

power exhaust fans, economizer, and the alarm relay. Use of

Service Test is recommended at initial system start up and during

troubleshooting (See Table 4 for point details).

Service Test mode has the following changes from normal

operation:

S Outdoor air temperature limits for cooling circuits, economizer,

and heating are ignored. Normal compressor time guards and

other staging delays are reduced to 30 seconds or less.

S Circuit alerts are limited to 1 strike (versus 3) before changing to

alarm shut down state.

S The status of ALM.N is ignored so all alerts and alarms are

broadcast on CCN.

S The words “SERVICE TEST” are inserted into every alarm

message.

Service test can only be turned ON/OFF at the unit display. Once

turned ON, other entries may be made with the display or through

CCN. To turn Service Test on, change the value of TEST to ON.

To turn service test off, change the value of TEST to OFF.

NOTE: Service Test mode may be password protected. Refer to

Basic Control Usage section for more information. Depending on

the unit model, factory--installed options, and field--installed

accessories, some of the Service Test functions may not apply.

Independent Outputs

The independent (INDP) submenu is used to change output status

for the economizer, power exhaust stages, crankcase heaters, alarm

relay, and outside air unit.. These independent outputs can operate

simultaneously with other Service Test modes. All outputs return to

normal operation when Service Test is turned off. When the

economizer is using the factory default Digital Control Type

(ConfigurationECONE.CTL is 1 or 2) then the Economizer

Calibration feature may be used to automatically check and reset

the economizer actuator range of motion. Refer to the economizer

operation section of more details. On EnergyX equipped units, use

the outside air unit (OAU) points to test the ERV components.

Fan Test

The fans (FANS) submenu is used to change output status for the

indoor fan. On single speed fan units the indoor fan contactor can

be energized or de--energized using the IDF1 test. For units with a

VFD the indoor fan speed test (F.SPD) is available. F.SPD runs the

fan at the desired speed entered. IDF Fan Mode (F.MOD) will run

the fan at the programmed speed for each mode. IDF2 and IDF3

are reserved for future use.

Cooling Test

The cooling (COOL) submenu is used to change output status for

the individual compressors. Compressor starts are staggered by 15

seconds. The fans (FANS) and heating (HEAT) service test outputs

are reset to OFF for the cooling service test. Indoor fans and

outdoor fans are controlled normally to maintain proper unit

operation. If LEN VFD fan is configured, then the indoor fan

speed will default to the Mech. Cooling Fan Speed configuration

point (ConfigurationI.FANFS.CL) when one compressor is

turned on. The Reduced Cool Fan Speed (F.SPD) can only be

changed while one stage is running. If more then one stage is on

the actual fan speed will be 100%. F.SPD shows the reduced speed

not actual speed. On single stage units, actual fan speed will be

100% when the compressor is on. All normal cooling alarms and

alerts are functional.

NOTE: Circuit A will always be operated with Circuit B.

Humidi--MiZert Test

For units with the factory Humidi-MiZer option, the Humidi-MiZer

(HZMR) submenu is used to change the output status to operate the

circuits in different Humidi--MiZer modes or to separately test the

Humidi--MiZer valve operations. Refer to the Humidi-MiZer operation

section for details on these modes and valves. The fans (FANS),

cooling (COOL), and heating (HEAT) service test outputs are reset to

OFF for the Humdi--MiZer service test. Indoor and outdoor fans are

controlled normally to maintain proper unit operation. If LEN VFD

fan is configured, then the indoor fan speed will default to the Reheat2

Fan Speed configuration point (ConfigurationI.FANFS.RH)

when Reheat2 test is turned on. The Reheat2 fan speed (F.SPD) only

reflects the speed setting for testing Reheat2 circuits, and can only be

changed when a circuit is in Reheat2. Actual speed may be different if

Reheat 1 tests are being performed. All normal cooling alarms and

alerts are functional. Refer to the Humidi--MiZer operating section for

more information.

NOTE: Circuit A will be operated with Circuit B.

Table 4 – Service Test Modes and Submodes Directory

DISPLAY MENU/

SUB-- MENU/

NAME

EXPANDED NAME VALUES

SERVICE TEST

TEST Field Service Test Mode Off/On

INDP Test Independent Outputs

ECON Economizer Position Test 0 to 100%

E.CAL Calibrate Economizer Off/On

PE.1 Power Exhaust 1 Test Off/On

PE.2 Power Exhaust 2 Test Off/On

ALRM Alarm Relay Test Off/On

OA.DM OAU 2-position Damper Close/Open

WHL OAU Wheel Test 0 to 100%

OA.OF OAU OA Fan Speed Test 0 to100

OA.XF OAU PE Fan Speed Test 0 to100

OA.HT OAU Tempring Heater Test 0 to 100

FANS Te st Fa n s

F. S P D Indoor Fan Speed Test 0 to 100

F. M O D IDF Fan Mode 0to7

IDF.1 Indoor Fan 1 Test Off/On

IDF.2 Indoor Fan 2 Test Off/On

IDF.3 Indoor Fan 3 Test Off/On

COOL Test Cooling

CMP.A Cool A Test Off/On

CMP.B Cool B Test Off/On

F. S P D Reduced Cool Fan Speed 60 to 100

HMZR Te s t H u m i d i --- M i Z e r

RH1.B Reheat1 B Test Off/On

RH1.C Reheat1 C Test Off/On

RH2.A Reheat2 A Test Off/On

RH2.B Reheat2 B Test Off/On

F. S P D Reheat2 Fan Speed 0 to 100

CRC Cool->Reheat1 Valve Test Off/On

RHV.A Reheat2 Valve A Test Off/On

RHV.B Reheat2 Valve B Test Off/On

HEAT Te st He a t i n g

HT.1 Heat Stage 1 Test Off/On

HT.2 Heat Stage 2 Test Off/On

F. S P D Reduced Heat Fan Speed 0 to 100

ComfortLINK v2.X

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Carrier 50HCQA Installation Manual Page 12

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