out a LOW COOL or a HIGH COOL mode and maintain a
low or high cool supply air set point.
• C. TYP = 6 (SPT-2 STG)
This configuration will force the control to monitor the
space temperature sensor to make a determination of mode
and allow two stages of cooling.
MACHINE DEPENDENT CONFIGURATIONS -- Some
configurations are linked to the physical unit and must not be
SUPPLY AIR RESET CONFIGURATION -- Supply Air
Reset can be used to modify the current cooling supply air set
point. 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--gEDT.R. See Table 46.
EDT Reset Configuration (RS. CF) -- This configuration ap-
plies to several machine control types (Configuration--9
UNIT_: TYP 1,2,3, and 5).
changed. The configurations are provided in case a field re-
placement of a board occurs and the settings are not preserved
by the download process of the new software. The following
configurations apply to all machine control types (C. TYP) ex-
cept 4 and 6. These configurations are located at the local dis-
play under Configuration --+UNIT. See Table 44.
Table 44 -- Machine Dependent Configurations
,T OI I
UNIT [UNIT CONFIGURATION
SIZE [OnitSize(20-60)[20-60 IUNITSIZE [
RFG.T [REFRIG 10-1 IREFRIGT
CND.T ICNDHX TYP [0-1 ICOILTYPE
*Dependent on unit,
DEFAULTS
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.
0 = NO RESET
No supply air reset is in effect
1= SPT RESET
Space temperature will be used as the reset control variable
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 0° F reset. An
input of 20 mA would correspond to 20 ° F 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.
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 configu-
ration matches the refrigerant called out by the model number
of the unit.
Condenser Type ((_WD. T) -- This configuration specifies the
type of condenser installed in the unit. Configuration (_WD. T is
set to 0 if the condenser is a round tube, plate fin coil (RTPF).
Configuration (_WD. T is set to 1 if the condenser is a micro-
channel heat exchanger coil (MCHX). Make sure this configu-
ration matches the condenser type called out by the model
number of the unit.
SET POINTS -- The set points for both cooling and heating
are located at the local display under Setpoints. See Table 45.
Reset Ratio (RTIO) -- This configuration is used when
RS.CF is set to 1 or 2. For every degree that the controlling
temperature (space/return) falls below the occupied cooling set
point (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 1or 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 _bnfiguration--+EDT.R--+
RS. CF is set to 3 (third party reset).
COOLING CONFIGURATION-- Relevant configurations for
mechanical cooling are located at the local display under
Configuration _,COOL. See Table 47.
Table 45 -- Setpoints
OHSP
OCSP
UHSP
UCSP
GAP
V.C.ON
V.C.OF
SA SP
SA.HI
SA.LO
SA.HT
T.PRG
T.CL
T.VOC
T.VUN
ITEM DEFAULTEXPANSION
Occupied Heat Setpoint
Occupied Cool Setpoint
Unoccupied Heat Setpoint
Unoccupied Cool Setpoint
Heat-Cool Setpoint Gap
VAV Occ. Cool On Delta
VAV Occ. Cool Off Delta
Supply Air Setpoint
Supply Air Setpoint Hi
Supply Air Setpoint Lo
Heating Supply Air Setpt
Tempering Purge SASP
Tempering in Cool SASP
Tempering Vent Occ SASP
Tempering Vent Unocc. SASP
RANGE
40-99
40-99
40-99
40-99
2-10
0-25
1-25
45-75
45-75
45-75
90-145
-20-80
5-75
-20-80
-20-80
UNITS
dF
dF
dF
dF
deltaF
deltaF
deltaF
dF
dF
dF
dF
dF
dF
dF
dF
CCN POINT
OHSP
OCSP
UHSP
UCSP
HCSP GAP
VAVOCON
VAVOCOFF
SASP
SASP_HI
SASP LO
SASP_IEAT
TEMPPURG
TEMPCOOL
TEMPVOCC
TEMPVUNC
68
75
55
90
5
3.5
2
55
55
60
85
50
5
65
50
ITEM
EDT.R
RS.CF
RTIO
LIMT
RES. S
Table 46 -- Supply Air Reset Configuration
EXPANSION I RANGE I UNITS
EVAP.DISCHRGE TEMP RESET
EDT Reset Configuration 0 - 3
Reset Ratio 0 - 10
Reset Limit 0 - 20 deltaF
EDT 4-20 ma Reset Input Enable/Disable
] CCN POINT
EDRSTCFG
RTIO
LIMT
EDTRSENS
] DEFAULT
ODisable
10
38
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