Document Part # 026-4280 Rev 1
Page 20 of 33
©2022 Emerson Digital Cold Chain, Inc. This document may be photocopied for personal use.
Visit our website at www.climate.emerson.com for the latest technical documentation and updates.
MdF
Maximum duration of defrost:
(ndt to 255 minutes) When
dPA
and
dPb
are not present, it sets the
defrost duration, otherwise it sets the maximum duration for defrost.
dSd
Start defrost delay:
(0 to 255 minutes) This is useful when different defrost start times are necessary
to avoid overloading the plant.
dFd
Display during defrost: rt
= real temperature; it = temperature reading at the defrost start;
Set
= setpoint;
dEF
= “dEF” label.
dAd
Defrost display time out:
(0 to 255 minutes) Sets the maximum time between the end of defrost and
the restarting of the real room temperature display.
Fdt
Drain down time:
(0 to 255 minutes) time interval between reaching defrost termination
temperature and the restoring of the control’s normal operation. This time allows the evaporator to
eliminate water drops that might have formed due to defrost.
dPo
First defrost after start-up: Y
= Immediately;
N
= after the IdF time
dAF
Defrost delay after continuous cycle:
(0 to 23.5 hours) time interval between the end of the fast
freezing cycle and the following defrost related to it.
PUMP DOWN
Pdt
Pump down type (nu, FAn, F-C)
nu:
pump down disabled
FAn:
pump down enabled. Fan is activated for pump down duration, compressor relay/solenoid valve
is switched off with CrE = N/Y o or activated with CrE = EUP or EU5.
F-C:
pump down enabled. Fan and compressor relay are activated for pump down duration. See above
for solenoid valve behavior.
Pdn
Pump down duration (0 to 255 minutes)
ON DEMAND DEFROST
Ctd
Differential for defrost start
(0.1°C to 25.5°C, 1°F to 45°F)
nbd
Minimum Compressor run time before defrost
0.0 to 24h00 minutes)
Mdb
Maximum Compressor run time before defrost
(0.0 to 24h00 minutes)
nct
Minimum coil temperature to trigger a defrost
(-55.0°C to 150.0°C; 67°F to 302°F]
FAN
FAP
Fan probe A
: (nP; P1; P2, P3, P4, P5) first probe used for fan.
FnC
Fan operating mode: C-n
= running with the solenoid valve, OFF during the defrost;
C-y
= running
with the solenoid valve, ON during the defrost;
O-n
= continuous mode, OFF during the defrost;
O-y
= continuous mode, ON during the defrost.
Fnd
Fan delay after defrost:
(0 to 255 minutes) The time interval between the defrost end and evaporator
fans start.
FCt
Temperature differential avoiding short cycles of fans
(0.0°C to 50.0°C; 0°F to 90°F) If the difference
of temperature between the evaporator and the room probes is more than the value of the Fct
parameter, the fans are switched on.
FSt
Fan stop temperature
: (-50 to 110°C; -58 to 230°F) setting of temperature, detected by evaporator
probe, above which the fan is always OFF.
FHy
Differential to restart fan:
(0.1°C to 25.5°C) (1°F to 45°F) when stopped, fan restarts when fan probe
reaches FSt-FHy temperature.
tFE
Fan regulation by temperature during defrost
(N,Y)
Fod
Fan activation time after defrost:
(0 to 255 minutes) it forces fan activation for indicated time.
Fon
Fan ON time
: (0 to 15 minutes)
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
are always off, with Fon=0 and FoF =0 the fan are always off.
Parameter
Description
Table 13-1 - Parameter List