Unit installation

11
SERVICE TEST
The Service Test function can be used to verify proper operation of
compressors, heating stages, 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, and alarm relay. 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.
Fan Test
The fans (FANS) submenu is used to change output status for the
indoor fan. On Direct Drive ECM fan units the indoor fan relays
can be energized or de--energized using the IDF1, IDF2, and IDF3
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.
Cooling Test
The cooling (COOL) submenu is used to change output status for
the compressor, loader, and the low ambient outdoor fan. 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
Supply Cooling Fan Speed configuration point
(Configuration→I.FAN→F. S P 2 ) when one compressor is turned
on. The Reduced Cool Fan Speed (F.SPD) can be used to change
the fan speed during cool test. When the compressor and loader are
turned on the fan will run at Supply Fan Maximum Speed
(FS.MX). On Direct Drive ECM units the fan will run Low Speed
when the compressor is turned on and will run High Speed when
the loader is turned on. The Reduced Cool Fan Speed (F.SPD) is
not used with ECM units. All normal cooling alarms and alerts are
functional. The low ambient outdoor fan test (L.ODF) can be
turned on and off while running the compressor.
Table 4 – Service Test Modes and Submodes Directory
DISPLAY MENU/ .
S U B --- M E N U / . .
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 T est Off/On
PE.2 Power Exhaust 2 T est Off/On
ALRM Alarm Relay Test Off/On
FANS Te s t Fa n s
F. S P D Indoor Fa n 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
LDR_A Cir A Loader Test Off/On
F. S P D Reduced Cool Fan Speed 0 to 100%
L.ODF Low Amb ODF Test 0 to 100%
HEAT Te s t H e a ti n g
HT.1 Heat Stage 1 Test Off/On
HT.2 Heat Stage 2 Test Off/On
F. S P D Reduced H eat Fan Speed 0 to 100%
Heating Test
The heating (HEAT) submenu is used to change output status for
the individual heat stages, gas or electric. The fans (FANS) and
cooling (COOL) service test outputs are reset to OFF for the
heating service test. Indoor and outdoor fans are controlled
normally to maintain proper unit operation. The fan will run at
Supply Fan Maximum speed (FS.MX) when running any heat
output. The Reduced Heat Fan Speed (F.SPD) is not used at this
time. All normal heating alarms and alerts are functional.
NOTE: Field terminal board terminal R must be connected to W1 for
the heat to operate in service test. Alert number T410 will occur as a
reminder if not done. If the normal unit control mode is thermostat
mode, then remove the R--W1 jumper after completing service test.
THIRD PARTY CONTROL
Third party controls may interface with the unit ComfortLink
controls through the connections described below. See other
sections of these instructions for more information on the related
unit control and configurations.
Cooling/Heating Control
The thermostat inputs are provided on the field connection terminal
board. The Unit Control Type configuration,
Configuration→UNIT→U.CTL, must be 2 to recognize the
below inputs. Terminal R is the 24vac source for the following:
S Y1 = First stage cooling
S Y2 = Second stage cooling
S W1 = First stage heating
S W2 = Second stage heating
S G = Indoor fan
Dehumidification Control
The HUM terminal can be used on the Field Connection board
when the isolation relay is installed between the MBB and TB.
Humidity Switch configuration, Configuration→UNIT→RH.SW,
identifies the normally open or normally closed status of this input
at LOW humidity.
NOTE: Dehumidification is considered a cooling function in the
software.
48/50LC