Carrier Weathermaster 48P2030-100, Controls, Start-Up, Operation, Service, And Troubleshooting

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OAQ High Reference (Configuration

IAQ

AQ.S.R

OQ.R.H)
This is the reference that will be used with a non-Carrier OAQ
sensor that may have a different characteristic curve. It rep-
resents the CO
2
level at 4 mA.
Diff. IAQ Responsiveness (Configuration

IAQ

AQ.SP

IAQ.R)
This is the configuration that is used to select the IAQ response
curves as shown in Fig. 14.
PRE-OCCUPANCY PURGE
The control has the option for a pre-occupancy purge to refresh
the air in the space prior to occupancy.
This feature is enabled by setting
Configuration

IAQ

IAQ.P

IQ.PG to Yes.
The IAQ Purge will operate under the following conditions:
• IQ.PG is enabled
• the unit is in the unoccupied state
• Current Time is valid
• Next Occupied Time is valid
• time is within two hours of the next occupied period
• time is within the purge duration (
Configuration

IAQ

IAQ.P

IQ.P.T )
If all of the above conditions are met, the following logic is used:
If OAT

IQ.L.O and OAT

OCSP and economizer is avail-
able then purge will be enabled and the economizer will be
commanded to 100%.
Else, if OAT <
IQ.L.O then the economizer will be positioned
to the IAQ Purge LO Temp Min Pos ( Configuration

IAQ

IAQ.P

IQ.P.L )
If neither of the above are true, then the dampers will be posi-
tioned to the IAQ Purge HI Temp Min Pos ( Configuration

IAQ

IAQ.P

IQ.P.H )
If this mode is enabled, the indoor fan and heat interlock relay
(VAV) will be energized.
IAQ Purge (Configuration

IAQ

IAQ.P

IQ.PG)
This is used to enable IAQ pre-occupancy purge.
IAQ Purge Duration (Configuration

IAQ

IAQ.P

IQ.P.T)
This is the maximum amount of time that a purge can occur.
IAQ Purge Lo Temp Min Pos (Configuration

IAQ

IAQ.P

IQ.P.L)
This is used to configure a low limit for damper position to be
used during the purge mode.
IAQ Purge Hi Temp Min Pos (Configuration

IAQ

IAQ.P

IQ.P.H)
This is used to configure a maximum position for the dampers
to be used during the purge cycle.
IAQ Purge OAT Lockout Temp (Configuration

IAQ

IAQ.P

IQ.L.O)
Nighttime lockout temperature, below which the purge cycle
will be disabled.
OPTIONAL AIRFLOW STATION
The
Comfort Link controls are capable of working with a factory-
installed optional airflow station that measures the amount of out-
door air entering the economizer. This flow station is intended to
measure ventilation airflows and has a limitation as to the maxi-
mum flow rate it can measure. The limits are 18,000 cfm for sizes
030-050 and 31,000 cfm for sizes 055-100.
All configurations for the outdoor airflow station can be found
in the Configuration

ECON

CFM.C , sub-menu. For this
algorithm to function, the Outdoor Air Cfm Sensor Configura-
tion ( OCF.S . ) must be enabled.
There are three set point configurations:
O.C.MN — Econ OACFM DCV Min Flow
O.C.MX — Econ OACFM DCV Max Flow
O.C.DB — Econ OACFM MinPos Deadbd
When the outdoor air cfm sensor is enabled, the Economizer
Min.Position ( Configuration

IAQ

DCV.C

EC.MN ) and the
IAQ Demand Vent Min.Pos ( Configuration

IAQ

DCV.C

IAQ.M ) will no longer be used. During vent periods, the control
modulates the damper to maintain the outdoor air intake quantity
between O.C.MX and O.C.MN . The indoor air quality algorithm
varies the cfm between these two values depending on Configura-
tion

IAQ

AQ.SP

DAQ.L and the Configuration

IAQ

AQ.SP

DAQ.H set points and upon the relationship between the
IAQ and the outdoor air quality (OAQ).
The economizer’s OA CFM Minimum Position Deadband
( O.C.DB ) is the deadband range around the outdoor cfm control
point at where the damper control will stop, indicating the control
point has been reached. See the Economizer section on page 72.
Humidification
The P Series Comfort Link controls can control a field-supplied
and installed humidifier device. The Comfort Link controls pro-
vide two types of humidification control: A discrete stage con-
trol (via a relay contact) and a proportional control type (com-
municating to a LEN actuator). The discrete stage control is
used to control a single-stage humidifier, (typically a spray
pump). The proportional control type is typically used to con-
trol a proportional steam valve serving a steam grid humidifier.
The
Comfort Link controls must be equipped with a controls
expansion module and an accessory space or return air relative
humidity sensor.
If a humidifier using a proportional steam valve is selected, the
Carrier actuator (Carrier Part No. HF23BJ050) must be adapted
to the humidifier manufacturer’s steam valve. Contact Belimo
Aircontrols for information on actuator linkage adapter packages
required to mount the actuator on the specific brand and type of
steam valve mounted by the humidifier manufacturer.
The actuator address must be programmed into the
Com-
fort Link unit’s humidifier actuator serial number variables.
SETTING UP THE SYSTEM
These humidity configuration are located in the local displays
under Configuration

HUMD . See Table 68. Related points
are shown in Table 69.
Humidifier Control Configuration (HM.CF)
The humidifier control can be set to the following configurations:
HM.CF = 0 — No humidity control.
HM.CF = 1 — Discrete control based on space relative
humidity.
HM.CF = 2 — Discrete control based on return air rela-
tive humidity.
HM.CF = 3 — Analog control based on space relative
humidity.
HM.CF = 4 — Analog control based on return air relative
humidity.
Humidity Control Set Point (HM.SP)
The humidity control set point has a range of 0 to 100%.
Humidifier PID Run Rate (HM.TM)
This is the PID run time rate.
Humidifier Proportional Gain (HM.P)
This configuration is the PID Proportional Gain.
Humidifier Integral Gain (HM.I)
This configuration is the PID Integral Gain.
Humidifier Derivative Gain (HM.D)
This configuration is the PID Derivative Gain.