Troubleshooting guide
MAGNUM VERSION 8 MANUAL REVISION 3.1
5
7.38.
H
OT
G
AS
R
EHEAT
(H
UMIDITY
)
C
ONTROL
.............................................................................................................................. 51
7.39.
E
XTRA
L
IQUID
L
INE
S
OLENOID
C
ONTROL
.............................................................................................................................. 53
7.40.
O
UTSIDE
A
IR
E
CONOMIZER
/F
LUID
C
OOLER WITH
A
NALOG
O
UTPUT
C
ONTROL
................................................................... 53
Economizer Set up ........................................................................................................................................................... 53
7.40.1.
Sequence of Operation .................................................................................................................................................... 53
7.40.2.
Outside Air Supply Economizer ...................................................................................................................................... 55
7.40.3.
Mechanical Cooling Enabled ......................................................................................................................................... 55
7.40.4.
Example: Fluid Cooler with VFD condenser fan .......................................................................................................... 55
7.40.5.
Example: Fluid Cooler with condenser compressor fans ............................................................................................. 57
7.40.6.
7.41.
H
IGH
S
UCTION
S
UPERHEAT
S
AFETY
........................................................................................................................................ 58
7.42.
L
OW
T
EMPERATURE
S
AFETY AND
U
NLOAD
(L
OW
S
ATURATED
S
UCTION
T
EMPERATURE
) ................................................. 58
7.43.
E
LECTRONIC
E
XPANSION
V
ALVE
C
ONTROL
L
OGIC
(EXV) .................................................................................................... 59
EXV Related Setpoints. .................................................................................................................................................... 63
7.43.1.
EXV Control States .......................................................................................................................................................... 63
7.43.2.
EXV Maximum Operating Pressure ............................................................................................................................... 64
7.43.3.
Tandem EXV Setup .......................................................................................................................................................... 64
7.43.4.
Refrigerant Level Control ............................................................................................................................................... 66
7.43.5.
EXV control methods for Step Loading Compressors ................................................................................................... 66
7.43.6.
7.44.
N
EW
S
ETPOINT
F
UNCTIONS
(08.00-A) .................................................................................................................................... 67
7.45.
V
OLTAGE
S
ENSOR
(08.00-R) ................................................................................................................................................... 67
7.46.
M
OTOR
A
MPS
(08.00-R) .......................................................................................................................................................... 68
7.47.
C
USTOM DISPLAY DESCRIPTION OF CIRCUIT
(08.00-R) ........................................................................................................... 68
7.48.
U
SER
L
OGIC
RO
D
ELAY
B
EFORE
O
FF
(08.00-R) .................................................................................................................... 68
7.49.
A
DDITIONAL
I
NFORMATION
M
ESSAGES
(08.00-U) ................................................................................................................. 68
7.50.
P
UMP
R
OTATION
(08.01-C) ...................................................................................................................................................... 68
7.51.
P
ROCESS
P
UMP
A
DDITION AND
R
OTATION
(08.01-C) ............................................................................................................ 68
7.52.
MOP
C
ONTROL
O
PTION TO
EXV
L
OGIC
(08.01-G) ............................................................................................................... 68
7.53.
D
ELTA
T
EMPERATURE
E
VAPORATOR
(08.01-G) .................................................................................................................... 68
7.54.
C
ONDENSER
L
OW
A
MBIENT
(08.01-O) ................................................................................................................................... 68
7.55.
N
EW
P
RESSURE
S
ENSOR
S
UPPORTED
(08.01-V) ..................................................................................................................... 68
7.56.
C
ENTRIFUGAL
V
ANE
C
ONTROL
(08.01-C) .............................................................................................................................. 68
7.57.
E
XTERNAL
C
ENTRIFUGAL
P
URGE
C
ONTROL
(08.01-P) .......................................................................................................... 69
7.58.
MCS
T
OUCH
S
CREENS
I
NTERFACE
(08.00-U) ........................................................................................................................ 69
7.59.
S
ENSOR
A
VERAGING
(08.00-R) ............................................................................................................................................... 69
7.60.
V
IRTUAL
P
OINTS
S
EPARATED
F
ROM
R
EAL
P
OINTS
(08.00-A) ............................................................................................... 69
7.61.
MDP
TO
EXV
C
ONTROL
L
OGIC
(8.01-X) ............................................................................................................................... 69
7.62.
L
OW
D
ISCHARGE
S
UPERHEAT
A
DJUSTMENT TO
EXV
L
OGIC
(8.01-X) ................................................................................. 69
7.63.
N
ORMAL
C
ONDENSER
D
ISCHARGE
C
ONTROL
B
YPASS
(8.02-A) ........................................................................................... 70
7.64.
T
EST FOR
V
OLTAGE
O
UT OF
B
ALANCE
(8.02-A) .................................................................................................................... 70
7.65.
E
XPANDED
T
ESTING OF
L
OW AND
H
IGH
O
FF
(8.02-E) ........................................................................................................... 70
7.66.
E
XPANDED
C
OMPRESSOR
R
OTATION TO
C
HECK FOR
M
AXIMUM
R
UN
T
IME
(8.02-E) .......................................................... 70
7.67.
N
EW
O
PTION TO TEST FOR
L
OW
S
UPERHEAT ON
S
UCTION OR
D
ISCHARGE
PSI
(8.02-E) ..................................................... 70
7.68.
N
EW
L
ARGE
C
HARACTER
S
CREEN
D
ISPLAYING
C
ONTROL
I
NFORMATION
(8.03-B)............................................................. 70
7.69.
C
IRCUIT
A
MP
V
ALUE ADDED TO
C
IRCUIT
S
TATUS
S
CREEN
(8.03-B) .................................................................................... 70
7.70.
L
OW
D
ISCHARGE
S
UPERHEAT
T
EST TO
E
CONOMIZER
(8.03-F) ............................................................................................. 70
7.71.
T
ONNAGE AND
KW
I
NFORMATION
(8.03-F) ........................................................................................................................... 71
KW Sensors ...................................................................................................................................................................... 71
7.71.1.
Tonnage Sensors ............................................................................................................................................................. 71
7.71.2.
Configuring KW and Tonnage ........................................................................................................................................ 72
7.71.3.
7.72.
O
IL
F
LOW
S
AFETY
(8.03-J) ...................................................................................................................................................... 74
7.73.
RTC
A
CCESS TO
U
SER
L
OGIC
(8.03-J) .................................................................................................................................... 74
7.74.
C
ONDENSER
C
ONTROL
L
OGIC
................................................................................................................................................. 74
RO Step Condenser Cut In – Out Logic ......................................................................................................................... 76
7.74.1.
RO Step Condenser with Variable Speed Fan ............................................................................................................... 76
7.74.2.
Condenser Control .......................................................................................................................................................... 76
7.74.3.
7.75.
B
OILER
/P
UMP
C
ONTROL
.......................................................................................................................................................... 87
MCS-Config Requirements ............................................................................................................................................. 87
7.75.1.
The following set points are required by the Boiler Logic ............................................................................................ 88
7.75.2.
Status of Boiler Logic displayed by MCS Connect ........................................................................................................ 90
7.75.3.