Service Test; Independent Outputs; Fan Test; Cooling Test - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

SERVICE TEST

The Service Test function can be used to verify proper opera-
tion of compressors, heating stages, Humidi-MiZer system, in-
door 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 6 for point details).
Service Test mode has the following changes from normal
operation:
• Outdoor air temperature limits for cooling circuits, econo-
mizer, and heating are ignored. Normal compressor time
guards and other staging delays are reduced to 30 seconds
or less.
• Circuit alerts are limited to 1 strike (versus 3) before
changing to alarm shut down state.
• The status of ALM.N is ignored so all alerts and alarms are
broadcast on CCN.
• 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. Depend-
ing on the unit model, factory-installed options, and field-in-
stalled accessories, some of the Service Test functions may not
apply.

Independent Outputs

The independent (INDP) submenu is used to change output sta-
tus 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 out-
puts return to normal operation when Service Test is turned off.
When the economizer is using the factory default Digital Control

Type (Configuration ECON
omizer 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 contac-
tor can be energized or de-energized using the IDF.1 test. For
units with a VFD the indoor fan speed test (F.SPD) is avail-
able. 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. IDF.2 and IDF.3 are reserved for future use.

Cooling Test

The cooling (COOL) submenu is used to change output status
for the individual compressors. Compressor starts are stag-
gered 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
when one compressor is turned on. The Reduced Cool Fan
Speed (F.SPD) can only be changed while one stage is run-
ning. 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

E.CTL is 1 or 2) then the Econ-
 
I.FAN FS.CL)
compressor is on. All normal cooling alarms and alerts are
functional.
NOTE: Circuit A will always be operated with Circuit B.
Humidi-MiZer ® 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 sep-
arately 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 nor-
mally to maintain proper unit operation. If LEN VFD fan is
configured, then the indoor fan speed will default to the Re-
heat2 Fan Speed
 
tion 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 cir-
cuit 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 6 — Service Test Modes and Submodes
DISPLAY MENU/
SUB-MENU/ EXPANDED NAME
NAME
SERVICE TEST
TEST Field Service Test Mode
INDP Test Independent Outputs
ECON Economizer Position Test
E.CAL Calibrate Economizer
PE.1 Power Exhaust 1 Test
PE.2 Power Exhaust 2 Test
ALRM Alarm Relay Test
OA.DM OAU 2-position Damper
WHL OAU Wheel Test
OA.OF OAU OA Fan Speed Test
OA.XF OAU PE Fan Speed Test
OA.HT OAU Tempring Heater Test
FANS Test Fans
F.SPD Indoor Fan Speed Test
F.MOD IDF Fan Mode
IDF.1 Indoor Fan 1 Test
IDF.2 Indoor Fan 2 Test
IDF.3 Indoor Fan 3 Test
COOL Test Cooling
CMP.A Cool A Test
CMP.B Cool B Test
F.SPD Reduced Cool Fan Speed
HMZR Test Humidi-MiZer
RH1.B Reheat1 B Test
RH1.C Reheat1 C Test
RH2.A Reheat2 A Test
RH2.B Reheat2 B Test
F.SPD Reheat2 Fan Speed
CRC Cool->Reheat1 Valve Test
RHV.A Reheat2 Valve A Test
RHV.B Reheat2 Valve B Test
HEAT Test Heating
HT.1 Heat Stage 1 Test
HT.2 Heat Stage 2 Test
F.SPD Reduced Heat Fan Speed
15
configuration point (Configura-
Directory
VALUES
Off/On
0 to 100%
Off/On
Off/On
Off/On
Off/On
Close/Open
0 to 100%
0 to100
0 to100
0 to 100
0 to 100
0 to 7
Off/On
Off/On
Off/On
Off/On
Off/On
60 to 100
Off/On
Off/On
Off/On
Off/On
0 to 100
Off/On
Off/On
Off/On
Off/On
Off/On
0 to 100