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63-4309—2
PM7600B
PM7600B INPUT AND OUTPUT OPTIONS
Recommended
Variable Name
Variable Label
Functional Description/Program Options
Value
CONFIGURATION PARAMETERS (continued)
Cooling Reset Type
COOL_RESET_TYPE
Basis for resetting discharge air cooling
setpoint.
Programmable:
0 =
No reset
1 =
Reset from Space Temperature
2 =
Reset from Outdoor Air Temperature
3 =
Reset from Supply Fan Motor position
4 =
Reset from Return Air Temperature
Type of Economizer
ECONO_TYPE
Programmable:
0 = No economizer.
1 = Modulating with programmable
minimum position.
2 = Floating with external minimum
position equipment.
Economizer Motor
ECONO_MOTOR_
Programmable duration, in number of
Speed
SPEED
seconds, for full motor travel from 0-100%.
Range = 30-160 seconds, programmed to
specified motor speed; i.e., 60.
Default = 100 seconds.
Water Economizer
WTR_ECONO_SP
When condenser inlet temperature is below
50
°
F
Setpoint
this value, condenser water is used for cooling.
One degree accuracy, 30 to 100
°
F.
Condenser Low
CND_LO_LIM
When condenser temperature drops below
Temperature Limit
this limit, turn off mechanical cooling. This
variable is programmable from 1 to 255
°
F;
Unprogrammed (or 0
°
F only) disables this
feature. If this variable is programmed, the
analog input CNDTMP must be configured.
Condenser Pump and
CND_ECON_SYNC
Allows condenser pump to turn on with
Economizer Sync
economizer. When this variable is programmed
to 0, the condenser pump output turns on with
cooling stages only. When this variable is
programmed to 1, the condenser pump
output turns on with the cooling stages and
economizer. When this variable is
programmed to 1, the digital output CNDPMP
must be configured and either the digital
outputs ECONO+ and ECONO- or the analog
output A_ECON must be configured.
Economizer Select
ECON_SELECT
Select source of economizer enable:
0 = Disable economizer.
1 = Use Outdoor Air Enthalpy High digital
input (OD_ENT).
2 = Use Condenser Inlet Temperature
and Water Economizer Setpoint.
3 = Use the difference between two
analog input sensors (i.e., enable
when Sensor 1 is less than Sensor 2
minus the economizer offset).
If this variable is programmed to 2, the analog
input CNDTMP must be configured.
If this variable is programmed to 3, the two
configuration variables ECON_SENS1 and
ECON_SENS2 must be programmed.