Emerson XM678D - XM678 D Controller Association and Replacement; Associating XM678 D with Case Control Circuit in E2

MODBUS Termination Blocks Default Parameter Map • 53
Fnd 1
Fan delay after
defrost
0 to 255
min
Time interval between the ending of
defrost
and the starting of the
evaporator fans.
FCt 10
Temperature
differential t
o avoid
short cycles of fans
[0°F to 90°F]
[0
.0°C to 50.0
°C]
If the difference of temperature between
the evaporator and the roo
m probes is
mo
re than the value of the FCt
parameter, the fans will start.
FSt 99
Fan stop
temperatur
e
[-67°F to 122°F]
[-55.0°C to 50.0°C]
Evaporator probe temperature above
which the fan is always OFF.
FHY 2 Fan stop differential
[1°F to 45°F]
[0.1°C to 25.5
°C]
When stopped, the fan restarts when the
fan
probe r
eaches [FSt – FHY] value of
temperature.
tFE n
Fan thermostat
during d
efrost
n; Y
n = fan follows FnC setti
ng during
defrost without temperature control
y = fan follows FnC set
ting during
defrost with FSt temperature control
Fod 0
Fan activation time
after defrost
(with
out
compressor)
0 to 255min
Forces fan activation for the indicated
ti
me.
Fon 0 Fan ON time 0 to 15min
With [FnC = C-n or C-Y
] (fan
activated in parallel with compressor),
it sets the evaporator fan ON cycling
time when the compressor is OFF. With
[Fon = 0] and [FoF ≠ 0], the fan is
always OFF. With [Fon = 0] and 
[Fo
F = 0], the fan i
s always OFF.
FoF 0 Fan OFF time 0 to 15min
With [FnC = C-n or C-Y
] (fan
activated in parallel with compressor),
it sets the evaporator fan OFF cycling
time when the compressor is OFF. With
[Fon = 0] and [FoF ≠ 0], the fan is
always OFF. With [Fon = 0] and 
[FoF = 0], the fan
i
s
always OFF.
trA UAL
Kind of PWM
regulation
UAL; rEG
; AC
PWM output if CoM value is different
from OA7.
UAL = th
e o
utput is at FSA value
(manua
l value).
rEG = th
e output is regulated with fan
algorithm described in fan section.
AC = anti-sweat heaters control
(requ
ire XW
EB5000 system).
SOA 0
Manual value of the
analog outp
ut
AMi to AMA
Value for the output if 
[trA = UAL] (0 to 100%).
SdP 55
Default Dewpoint
value (o
r safety
value in case of
XWEB link lost)
[-67°F to 122°F]
[-
55.0
°C to 50.0°C]
Default value of dewpoint used when
th
ere is no supervising sy
stem
(XWEB5000). Used only if 
[trA = AC].
Label Value Description Range Notes
Table 24-1 - Default Parameter Map