Humidi-Mizer System; Cooling - Carrier Weathermaster 48P2030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

®
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 condenser) while the unit's compressors are
OFF. Calibration is a mode in which the unit software will first
over-drive each 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 troubleshooting
tool. The valves will automatically go through the calibration
process anytime the unit is powered down, unit power is cy-
cled, or anytime there is a loss of communication between the
EXV board and the valve. There should be no need to manual-
ly calibrate the valves under normal circumstances.
This sub-menu also allows manual manipulation of RHV (re-
heat 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
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 energized.
When RHV is switched to the OFF position, the three-way
valve will be de-energized. To exercise this valve with a Cir-
cuit 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

SERVICE TEST HMZR
EXV POSITION)
On Humidi-MiZer equipped units, this item allows the user to
exercise the valve that controls flow to the Circuit B condenser.
The valve default position is 100% (completely 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 operational when Circuit
B compressors are OFF. To exercise this valve with a Circuit B
compressor commanded ON, go to Service Test
C.EXV. To view the actual valve position at any time, the user
can use the Outputs menu (Outputs

SERVICE TEST HMZR
POSITION)
On Humidi-MiZer equipped units, this item allows the user to ex-
ercise the valve that controls discharge gas bypass around the Cir-
cuit B condenser. The valve default position is 0% (completely
closed). The user will be able to adjust the valve from 0 to 100%
through this function. As confirmation that the valve is operation-
al, 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
view the actual valve position at any time, the user can use the

Outputs menu (Outputs COOL

SERVICE TEST HMZR
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 software 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.

RHV (HUMIDI-MIZER 3-WAY
 
COOL

C.EXV (HMV-1: CONDENSER

COOL
 
COOL C.EXV).

B.EXV (HMV-2: BYPASS EXV
 
COOL B.EXV). To

B.EXV).

C.CAL (CONDENSER EXV
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 clo-
sure. Note that the calibration feature in Service Test is only pro-
vided as an additional troubleshooting tool. The valves will auto-
matically go through the calibration process anytime the unit is
powered down, unit power is cycled, or communication is lost be-
tween the EXV board and the valve. There should be no need to
manually calibrate the valves under normal circumstances.
SERVICE
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 communication is lost between
the EXV board and the valve. There should be no need to man-
ually calibrate the valves under normal circumstances.

Cooling

The cooling sub-menu offers many different service tests.
• Service Test
Pos). It is possible to manually move the actuator during

the cooling test mode at all times, regardless if economizer
cooling is suitable or not.
RHV).
• Service Test
Upon entering the cooling sub-menu, the static pressure con-
trol 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 configured set point for nor-
mal 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
this item is set to a non-zero value, the current assigned com-

pression 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 au-
tomatically 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 mechan-
ical cooling, the unit will protect itself. Compressor diag-
nostics are active, monitoring for high discharge pressure,
low suction pressure, etc. The user can also turn the mini-
mum load valve on and off and set the digital scroll capac-
ity (on units equipped with this device).
• Service Test
On Humidi-MiZer equipped units, this item allows the user to
switch the reheat valve from ON to OFF and vice versa.
When RHV is switched to the ON position, a three-way valve
will be energized, allowing refrigerant flow to enter the reheat
coil as if in a dehumidification mode or reheat mode. When
RHV is switched to the OFF position, the three-way valve
will be deenergized and the unit will revert back to normal
cooling. Note that this function only allows manipulation of
RHV if a compressor on Circuit B has already been turned
38
 
TEST HMZR B.CAL
 
Cool E.POS (Econo Damper Command
 
COOL SP.SP (Static Pressure Set Point).
 
COOL CL.ST (Requested Cool Stage). If
 
COOL RHV (Humidi-MiZer 3-Way Valve).
(BYPASS EXV