32
Actuators — In the AC.T.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 the
three economizer actuators (2 outdoor air and 1 return air), hy-
dronic/steam or humidifier actuators.
NOTE: Once a calibration has been started, the user cannot
exit test mode or select any other test mode operation until
complete.
Humidi-Mizer
®
System — In the Humidi-MiZer
(HMZR) sub-menu, it will be possible to control and calibrate
the Humidi-MiZer modulating valves (gas bypass and con-
denser) while the unit's compressors are OFF. Calibration is a
mode in which the unit software will first over-drive each
valve completely shut and to establish the "zero" open posi-
tion. The controller then keeps track of the valve's position for
normal operation. During this calibration phase, a light ratchet-
ing sound may be heard and will serve as proof of valve opera-
tion and closure. Note that the calibration feature in Service
Test is only provided as an additional troubleshooting tool.
This is to ensure that the valve will automatically go through
the calibration process anytime the unit is powered down, unit
power is cycled, or anytime there is a loss of communication
between the EXV board and the valve. There should be no
need to manually calibrate the valves under normal circum-
stances.
This sub-menu also allows manual manipulation of RHV
(reheat 3-way valve), the bypass valve, and condenser valve.
With the compressors and outdoor fans off, the user should
hear a light ratcheting sound during movement of the two
modulating valves. The sound can serve as proof of valve
operation.
Service Test
HMZR
RHV (Humidi-MiZer 3-Way Valve)
— On Humidi-MiZer equipped units, this item allows the user
to switch the reheat valve from ON to OFF or OFF to ON
when compressors are in the OFF position. When RHV is
switched to the ON position, the three-way valve will be ener-
gized. When RHV is switched to the OFF position, the three-
way valve will be deenergized. To exercise this valve with a
Circuit B compressor commanded ON, go to (Service Test
COOL
RHV). To view the actual valve position at any time,
the user can use the Outputs menu (Outputs
COOL
RHV).
Service Test
HMZR
C.EXV (HMV-1: Condenser EXV
Position) — On Humidi-MiZer equipped units, this item al-
lows the user to exercise the valve that controls flow to the Cir-
cuit B condenser. The valve default position is 100% (com-
pletely open). The user will be able to adjust the valve from 0
to 100% through this function. As confirmation that the valve
is operational, the user should hear a light ratcheting sound as
the valve opens and closes. Note that this function is only oper-
ational when Circuit B compressors are OFF. To exercise this
valve with a Circuit B compressor commanded ON, go to
(Service Test
COOL
C.EXV). To view the actual valve
position at any time, the user can use the Outputs menu (Out-
puts
COOL
C.EXV).
Service Test
HMZR
B.EXV (HMV-2: Bypass EXV
Position) — On Humidi-MiZer equipped units, this item al-
lows the user to exercise the valve that controls discharge gas
bypass around the Circuit B condenser. The valve default posi-
tion is 0% (completely closed). The user will be able to adjust
the valve from 0 to 100% through this function. As confirma-
tion that the valve is operational, the user should hear a light
ratcheting sound as the valve opens and closes. Note that this
function is only operational when Circuit B compressors are
OFF. To exercise this valve when a Circuit B compressor is
ON, go to (Service Test
COOL
B.EXV). To view the
actual valve position at any time, the user can use the Outputs
menu (Outputs
COOL
B.EXV).
Service Test
HMZR
C.CAL (Condenser EXV Calibrate)
— On Humidi-Mizer configured units, this item allows the
user to calibrate the valve that controls flow to the Circuit B
condenser. Switching C.CAL to ON will instruct the unit soft-
ware to over-drive the valve in the closing direction. This is to
ensure that the valve is completely shut and to establish the
"zero" open position. The controller then keeps track of the
valve's position for normal operation. During this calibration
phase, a light ratcheting sound may be heard and will serve as
proof of valve operation and closure. Note that the calibration
feature in Service Test is only provided as an additional trou-
bleshooting tool. The valves will automatically go through the
calibration process anytime the unit is powered down, unit
power is cycled, or anytime there is a loss of communication
between the EXV board and the valve. There should be no
need to manually calibrate the valves under normal circum-
stances.
Service Test
HMZR
B.CAL (Bypass EXV Calibrate) —
On Humidi-Mizer configured units, this item allows the user to
calibrate the valve that controls discharge gas bypass around
the Circuit B condenser. Switching B.CAL to ON will instruct
the unit software to over-drive the valve in the closing direc-
tion. This is to assure that the valve is completely shut and to
establish the "zero" open position. The controller then keeps
track of the valve's position for normal operation. During this
calibration phase, a light ratcheting sound may be heard and
will serve as proof of valve operation and closure. Note that the
calibration feature in Service Test is only provided as an addi-
tional troubleshooting tool. The valves will automatically go
through the calibration process anytime the unit is powered
down, unit power is cycled, or anytime there is a loss of com-
munication between the EXV board and the valve. There
should be no need to manually calibrate the valves under nor-
mal circumstances.
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 Set
Point). Upon entering the cooling sub-menu, the static
pressure control item will default to the unit's static pres-
sure set point. Thereafter, as mechanical cooling com-
mences and the fan starts, the static pressure can be
manually adjusted during the cool mode without affect-
ing the configured set point for normal runtime opera-
tion. 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 will
be “read-only” and reflect the current staging state. In
addition, this item will automatically clamp the cooling
stages to its pre-configured maximum.
• Manual relay control of individual compressors. If the
cooling stage pattern request is set to zero, the user will
have the ability to manually control compressors. 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. Compres-
sor diagnostics are active, monitoring for high discharge
pressure, low suction pressure, etc. The user can also
turn the minimum load valve on and off and set the digi-
tal scroll capacity (on units equipped with this device).
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