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47
SUPPLY AIR RESET CONFIGURATION
Supply air reset can be used to modify the current cooling sup-
ply air set point. Supply air reset is applicable to control types,
C.TYP
= 1, 2, 3, and 4. The configurations for reset can be
found at the local display under
Configuration
EDT.R.
See
Table 34.
EDT Reset Configuration (RS.CF)
This configuration applies to several machine control types
(
Configuration
UNIT
C.TYP
=
1,2,3, and 4).
• 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 fi-
nal amount of reset to be applied (
Inputs
RSET
SA.S.R
).
• 2 = RAT RESET
Return-air temperature will be used as the reset control
variable along with both
RTIO
and
LIMT
in the calcula-
tion of the final amount of reset to be applied (
Inputs
RSET
SA.S.R
).
• 3 = THIRD 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 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 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 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).
COOLING CONFIGURATION
Relevant configurations for mechanical cooling are located at
the local display under
Configuration
COOL
.
See Table 35.
Enable Compressor A1 (A1.EN)
This configuration is used to disable the A1 compressor in case
of failure for size 30 to 100 units.
Enable Compressor A2 (A2.EN)
This configuration is used to disable the A2 compressor in case
of failure for size 50 to 100 units. It is always disabled for size
30 to 40 units.
Enable Compressor A3 (A3.EN)
This configuration is used to disable the A3 compressor in case
of failure for size 90 and 100 units. It is always disabled for
size 30 to 75 units.
Enable Compressor B1 (B1.EN)
This configuration is used to disable the B1 compressor in case
of failure for size 30 to 100 units.
Enable Compressor B2 (B2.EN)
This configuration is used to disable the B2 compressor in case
of failure for size 40 to 100 units. It is always disabled for size
30 and 35 units.
Enable Compressor B3 (B3.EN)
This configuration is used to disable the B3 compressor in case
of failure for size 90 and 100 units. It is always disabled for
size 30 to 75 units.
Table 33 — Setpoints
Table 34 — Supply Air Reset Configuration
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 110
dF
UCSP
90
GAP
Heat-Cool Setpoint Gap
2 to 10
deltaF
HCSP_GAP
5
V.C.ON
VAV Occ. Cool On Delta
0 to 25
deltaF
VAVOCON
3.5
V.C.OF
VAV Occ. Cool Off Delta
1 to 25
deltaF
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
2
RTIO
Reset Ratio
0 to 10
RTIO
3
LIMT
Reset Limit
0 to 20
deltaF
LIMT
10
RES.S
EDT 4-20 ma Reset Input
Enable/Disable
EDTRSENS
Disable
Summary of Contents for Weathermaster 48P2030-100
Page 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Page 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Page 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Page 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Page 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Page 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Page 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Page 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Page 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Page 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...