Carrier WEATHERMASTER 48/50Z030-105 - Manual (Page 38)

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Service Test Mode Logic — Operation in the Service
Test mode is sub-menu specific except for the INDP sub-
menu. Leaving the sub-menu while a test is being performed
and attempting to start a different test in the new sub-menu will
cause the previous test to terminate. When this happens, the
new request will be delayed for 5 seconds. For example, if
compressors were turned on under the COOL sub-menu, any
attempt to turn on heating stages within the HEAT sub-menu
would immediately turn off the compressors and 5 seconds lat-
er the controller would honor the requested heat stages.
However, it is important to note that the user can leave a
Service Test mode to view any of the local display menus (Run
Status, Temperatures, Pressures, Setpoints, Inputs, Outputs,
Configuration, Time Clock, Operating Modes, and Alarms)
and the control will remain in the Service Test mode.
Independent Outputs — The INDP sub-menu items
can be turned on and off regardless of the other category states.
For example, the humidifier relay or remote alarm/auxiliary re-
lay can be forced on in the INDP sub-menu and will remain on
if compressor stages were requested in the COOL sub-menu.
Fans — Upon entering the FANS sub-menu, the user will be
able to enact either a manual or automatic style of test opera-
tion. The first item in the sub-menu, Fan Test Mode Automatic
(Service Test → FANS → F.MOD), allows the fan and the con-
figured static pressure or building pressure control to begin as
in the application run mode. During this automatic mode, it is
possible to manually control condenser fans A and B.
If Fan Test Mode Automatic (Service Test → FANS →
F.MOD), is set to NO, then the user will have individual con-
trol over duct static pressure (VFD speed or IGV position),
building pressure and condenser fan control. Additionally, the
controller will protect the system from developing too much
static pressure. If the static pressure during manual control
rises above 3 in. wg or if the Static Pressure Set Point
(Setpoints → SPSP) is greater than 2.5 in. wg and static pres-
sure is 0.5 in. wg higher than SPSP, then all options in the
FANS menu will be cleared back to their default OFF states.
The power exhaust dampers can be individually energized
or together and their damper positions can be forced to any
position.
Actuators — In the ACT.C sub-menu, it will be possible to
control and calibrate actuators. Calibration is a mode in which
the actuator moves from 0% to the point at which the actuator
stalls, and it will then use this angular travel range as its
“control angle”. It will also be possible to view the “control
angle” adopted by the actuator after a calibration.
Within this sub-menu, the user may calibrate and control
economizer actuators 1 and 2, the inlet guide vane actuator, the
building pressure actuators 1 and 2, the hydronic heating coil
actuator, and the humidifier steam valve control actuator.
NOTE: Once a calibration has been started, the user cannot
exit test mode or select any other test mode operation until
complete.
Cooling — The cooling sub-menu offers many different
service tests.
• Service Test
→ Cool → E.POS (Econo Damper Command
Pos). It is possible to manually move the actuator during
the cooling test mode at all times, regardless if econo-
mizer cooling is suitable or not.
• Service Test → COOL → SP.SP (Static Pressure Setpoint).
Upon entering the cooling sub-menu, the static pressure
control item will default to the unit's static pressure set
point. Thereafter, as mechanical cooling commences and
the fan starts, the static pressure can be manually
adjusted during the cool mode without affecting the con-
figured set point for normal runtime operation. By
adjusting the static pressure set point, the user can
increase or decrease the supply airflow. Do not use a
static pressure that will exceed the system limits.
• Service Test → COOL → CL.ST (Requested Cool Stage).
If this item is set to a non-zero value, the current
assigned compression stage for this unit will be selected
and enacted. Thereafter, the individual compressor and
unloaders items will be “read-only” and reflect the cur-
rent staging state. In addition, this item will automati-
cally clamp the cooling stages to its pre-configured
maximum.
• Service Test → COOL → LD.LG (Lead/Lag Select Test).
This item may only be adjusted when the cooling stage
pattern request item is set to zero. If the request pattern is
zero, then the user may select whether the cooling stage
request is based on lead or lag staging.
• Manual relay control of individual compressors and
unloaders. If the cooling stage pattern request is set to
zero, the user will have the ability to manually control
compressors and unloaders. If the user energizes
mechanical cooling, the supply fan and the outdoor fans
will be started automatically. During mechanical cooling,
the unit will protect itself. Compressor diagnostics are
active, monitoring for high discharge pressure, low suc-
tion pressure, etc.
Heating — If unit has a thermostat connected (C.TYP = 3
or 4), install the RED jumper wires between TB202, terminals
R (1), W2 (3) and W1 (4). Terminal block TB202 is located in
the unit control box. Remember to disconnect these jumpers
when Test Mode is completed. The Heat Test Mode sub-menu
will offer automatic fan start-up if not a gas fired heat unit. On
gas heat units, the IGC feedback from the gas control units will
bring the fan on as required.
Within this sub-menu, control of the following is possible:
• Service Test
→ HEAT → HT.ST (Requested Heat Stage).
When this item is non-zero, the currently configured heat
type will energize the corresponding heat relay pattern
that reflects the requested stage. In addition the upper
limit will be clamped to reflect the maximum configured
number of stages. When non-zero, the heat relays will be
“read-only” and reflect the currently selected pattern.
• Service Test → HEAT → HT.1-6, Service Test → HEAT →
H.I.R (Manual Heat Relay Control). If the “Heat Stage
Request” item is set to zero, it will be possible to individ-
ually control the heat relays, including the heat interlock
relay.
• Service Test → HEAT → HTC.C (Ht Coil Command Posi-
tion). If configured for this heat type, the user will be
able to manually control the positioning of the actuator
which controls hot water (0 to 100%).
NOTE: When service test has been completed, if unit has a
thermostat connected (C.TYP = 3 or 4), remove the RED
jumper wires at TB202, terminals R (1), W2 (3) and W1 (4).
Terminal block TB202 is located in the unit control box. Store
these jumpers in the unit control box for future use.