35
2. No compressors are on or requested on.
3. All compressors are available for staging.
The testing screen will display the following:
The compressor auto-component test functions by staging all
compressors ON and verifying a corresponding change in the
compressor CSB (compressor status board), and that circuit suc
-
tion pressure (
SP.A/SP.B
) decreases at least
AC_SP_DR.
AC_SP_DR
(Auto-Component Suction Pressure Drop) is the ex
-
pected suction pressure drop when starting a compressor. It is used
during the compressor auto component test. When a compressor is
staged, the control verifies the suction pressure drops by
AC_SP_DR
. The default value is 3, with a range of 0 to 10 psig.
Setting
CP.TS
=ON will perform the following automatically:
1. Turn supply fan and required condenser fans ON.
2. After 25 seconds, stage up one compressor.
3. Verify CSB changes state properly.
4. Verify circuit SP decreases by
AC_SP_DR
within
30 seconds.
5. Wait 30 seconds.
6. Repeat Steps 1-5 for next compressor until all compressors
are staged ON.
7. Stage all compressors down and verify CSB changes state
properly.
8. End test.
If a compressor is commanded ON and the corresponding CSB
indicates OFF, a “Compressor Failure” alert will be logged:
If a compressor is commanded ON and the corresponding CSB
indicates ON while a decrease in suction pressure is not detect
-
ed, the “Suction Pressure Alert” will be logged:
If a compressor is commanded OFF and the corresponding CSB
indicates ON, a “Compressor Stuck” alarm will be logged:
Selecting “RSLT” from the compressor auto-test screen will
display the compressor auto-test result screen. The following
display is an example where the A2 compressor failed the test:
Digital Scroll Compressor (A1)
Auto-Component Test
The digital scroll auto-component test requires the following
conditions:
1. Unit is not shut down due to failure (A152).
2.
DG.A1
=YES (digital scroll compressor installed on A1
and enabled).
3. OAT<DSMAXOAT (digital scroll maximum OAT).
4. No compressors are on or requested on.
5. Compressor A1 is available to start.
The testing screen will display the following:
The digital scroll auto-component test functions by running the
scroll compressor (
A1.CP
) at 50% and 100% while verifying a
change in average circuit suction pressure (
SP.AV
) of
AC_DS_SP
.
The digital scroll auto-component suction pressure drop
(
AC_DS_SP
) will default to 2.5 psig with a range of 0 to 10 psig.
Setting
DS.TR
=ON will perform the following:
1. Turn supply fan and condenser fans ON.
2. Wait for 25 seconds.
3. Set digital scroll capacity to 50%.
4. Verify circuit
SP.AV
decreases by
AC_DS_SP
within
30 seconds.
5. Wait 2 minutes.
6. Set digital scroll capacity to 100%.
7. Verify circuit
SP.AV
decreases
AC_DS_SP
within
30 seconds.
8. End test.
If
SP.AV
is verified to change properly at 50% and 100% ca
-
pacity, then
DS.RS
= PASS, otherwise
DS.RS
=FAIL.
EXV Auto-Component Test
The EXV auto-component test requires the following conditions:
1. Unit is not shut down due to failure (A152).
2. OAT>70°F.
3. No compressors are on or requested on.
4. A1, B1, B2 are available on a 75-ton unit; A1, A2, B1, B2
are available on 90, 105, 120, 130, and 150-ton units.
The testing screen will display the following:
CP.TS
ON
Run Compressor Auto-Test
CT.ST
Staging 1/8 Test Status and Timer
SP.A
188.5 psig Cir A Suction Pressure
SP.B
207.3 psig Cir B Suction Pressure
RSLT
Comps Auto-Test Results
T051
Circuit A, Compressor 1 Failure
T052
Circuit A, Compressor 2 Failure
T053
Circuit A, Compressor 3 Failure
T059
Circuit A, Compressor 4 Failure
T054
Circuit B, Compressor 1 Failure
T055
Circuit B, Compressor 2 Failure
T056
Circuit B, Compressor 3 Failure
T060
Circuit B, Compressor 4 Failure
T062
Circuit A, Suction Pressure Alert
T063
Circuit B, Suction Pressure Alert
A051
Circuit A, Compressor 1 Stuck On Failure
A052
Circuit A, Compressor 2 Stuck On Failure
A053
Circuit A, Compressor 3 Stuck On Failure
A059
Circuit A, Compressor 4 Stuck On Failure
A054
Circuit B, Compressor 1 Stuck On Failure
A055
Circuit B, Compressor 2 Stuck On Failure
A056
Circuit B, Compressor 3 Stuck On Failure
A061
Circuit B, Compressor 4 Stuck On Failure
A1
Passed
Comp A1 Auto-Test Result
A2
Failed
Comp A2 Auto-Test Result
A3
Passed
Comp A3 Auto-Test Result
A4
Passed
Comp A4 Auto-Test Result
B1
Passed
Comp B1 Auto-Test Result
B2
Passed
Comp B2 Auto-Test Result
B3
Passed
Comp B3 Auto-Test Result
B4
Passed
Comp B4 Auto-Test Result
DS.TR
ON
Run Dig Scroll Auto-Test
DS.DT
Running 1/1 Test Status and Timer
A1.CP
50%
Compressor A1 Capacity
SP.A
188.5 psig
Cir A Suction Pressure
SP.AV
185.5 psig
Avg Suction Pressure A
DS.RS
Running
Dig Scroll AutoTest Stat
EX.TR
ON
Run EXVs Auto-Test
XT.ST
Running CMPS Test Status and Timer
SH.SP
12.0 dF
EXV Superheat Ctrl SP
SH.A1
11.7 dF
Cir A EXV1 Superheat Temp
SH.A2
12.4 dF
Cir A EXV2 Superheat Temp
SH.B1
12.4 dF
Cir B EXV1 Superheat Temp
SH.B2
12.1 dF
Cir B EXV2 Superheat Temp
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...