34
MACHINE DEPENDENT CONFIGURATIONS
Some configurations are linked to the physical unit and must
not be changed. The configurations are provided in case a field
replacement of a board occurs and the settings are not pre-
served by the download process of the new software. The fol-
lowing configurations apply to all machine control types
(C.TYP) except 4 and 6. These configurations are located at the
local display under Configuration
UNIT. See Table 33.
Table 33 — Machine Dependent Configurations
*Dependent on unit.
Unit Size (SIZE)
There are several unit sizes (tons) for the A Series control. Make
sure this configuration matches the size called out by the model
number of the unit. This is important as the cooling stage tables
are directly determined based on this configuration.
Refrigerant Type (RFG.T)
This configuration specifies the type of refrigerant used in the
unit. Configuration RFG.T is set to 0 if the refrigerant used is
R-22. Configuration RFG.T is set to 1 if the refrigerant used is
R-410A. Make sure this configuration matches the refrigerant
called out by the model number of the unit.
Condenser Type (CND.T)
This configuration specifies the type of condenser installed in
the unit. Configuration CND.T is set to 0 if the condenser is a
round tube, plate fin coil (RTPF). Configuration CND.T is set to
1 if the condenser is a microchannel heat exchanger (MCHX)
coil. Make sure this configuration matches the condenser type
called out by the model number of the unit.
SETPOINTS
The setpoints for both cooling and heating are located at the lo-
cal display under Setpoints. See Table 34.
SUPPLY AIR RESET CONFIGURATION
Supply Air Reset can be used to modify the current cooling supply
air setpoint. Supply Air Reset is applicable to control types,
C.TYP = 1, 2, 3, and 5. The configurations for reset can be found
at the local display under Configuration
EDT.R. See Table 35.
EDT Reset Configuration (RS.CF)
This configuration applies to several machine control types
(Configuration
UNIT
C.TYP = 1,2,3, and 5).
• 0 = NO RESET
No supply air reset is in effect.
•1 = SPT RESET
Space temperature will be used as the reset control vari-
able along with both RTIO and LIMT in the calculation of
the final amount of reset to be applied (Inputs
RSET
SA.S.R).
• 2 = RAT RESET
Return-air temperature will be used as the reset control vari-
able along with both RTIO and LIMT in the calculation of
the final amount of reset to be applied (Inputs
RSET
SA.S.R).
• 3 = 3RD PARTY RESET
The reset value is determined by a 4 to 20 mA third party
input. An input of 4 mA would correspond to 0ºF reset. An
input of 20 mA would correspond to 20ºF reset. Configur-
ing the control for this option will cause RES.S to become
enabled automatically with the CEM board. To avoid
alarms make sure the CEM board and third party input are
connected first before enabling this option.
Reset Ratio (RTIO)
This configuration is used when RS.CF is set to 1 or 2. For ev-
ery degree that the controlling temperature (space/return) falls
below the occupied cooling setpoint (OCSP), the calculated
value of the supply air reset will rise by the number of degrees
as specified by this parameter.
Reset Limit (LIMT)
This configuration is used when RS.CF is set to 1 or 2. This
configuration places a clamp on the amount of supply air reset
that can be applied.
EDT 4-20 mA Reset Input (RES.S)
This configuration is automatically enabled when Configura-
tion
EDT.R
RS.CF is set to 3 (third party reset).
Table 34 — Setpoints
Table 35 — Supply Air Reset Configuration
ITEM EXPANSION RANGE
CCN
POINT
DEFAULTS
UNIT UNIT CONFIGURATION
SIZE
Unit Size (20 to
60)
20 to 60 UNITSIZE *
RFG.T REFRIG 0 to 1 REFRIG_T *
CND.T CND HX TYP 0 to 1 COILTYPE *
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
OHSP Occupied Heat Setpoint 40 to 99 dF OHSP 68
OCSP Occupied Cool Setpoint 40 to 99 dF OCSP 75
UHSP Unoccupied Heat Setpoint 40 to 99 dF UHSP 55
UCSP Unoccupied Cool Setpoint 40 to 99 dF UCSP 90
GAP Heat-Cool Setpoint Gap 2 to 10 ^F HCSP_GAP 5
V.C.ON VAV Occ. Cool On Delta 0 to 25 ^F VAVOCON 3.5
V.C.OF VAV Occ. Cool Off Delta 1 to 25 ^F VAVOCOFF 2
SASP Supply Air Setpoint 45 to 75 dF SASP 55
SA.HI Supply Air Setpoint Hi 45 to 75 dF SASP_HI 55
SA.LO Supply Air Setpoint Lo 45 to 75 dF SASP_LO 60
SA.HT Heating Supply Air Setpt 90 to 145 dF SASPHEAT 85
T.PRG Tempering Purge SASP –20 to 80 dF TEMPPURG 50
T.CL Tempering in Cool SASP 5 to 75 dF TEMPCOOL 5
T.V.OC Tempering Vent Occ SASP –20 to 80 dF TEMPVOCC 65
T.V.UN Tempering Vent Unocc. SASP –20 to 80 dF TEMPVUNC 50
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
EDT.R EVAP.DISCHRGE TEMP RESET
RS.CF EDT Reset Configuration 0 to 3 EDRSTCFG 0
RTIO Reset Ratio 0 to 10 RTIO 2
LIMT Reset Limit 0 to 20 ^F LIMT 10
RES.S EDT 4-20 ma Reset Input Enable/Disable EDTRSENS Disable
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