Evaporator Fans; Condenser Fans - Eliwell Coldface EWHT800LX Series Manual

band, always positive) and switches off when the value is SEt+db-diF.
SEt = 20.0°C Cooling SetPoint; db = 2.0°C temperature intervention half-band, always positive
diF = differential = 2.0
COMPRESSOR
Digital output OUT4 is configured as compressor relay. The compressor is active if the cold room
temperature detected by Pb1 exceeds the value of SP1 + differential diF. The compressor stops if the
cold room temperature detected by Pb1 falls below the SP1 value. The instrument includes compres-
sor on/off protection*

EVAPORATOR FANS

Digital output OUT5 is configured as evaporator fan relay and is activated in the required cases, ac-
cording to delays and parameter settings*
Default fan settings
dt = 0 min. drip time; dFd = Y. Fans off during defrosting
LIGHT
Digital output OUT8 is configured as light relay. The light is activated by pressing and holding the
LIGHT key (G).
Since digital input D.I. 1 is configured as door switch, relay OUT8 (light) is activated when the door is
opened. The light also switches on with the instrument in standby*.

CONDENSER FANS

Probe Pb4 is configured as NTC condenser fan temperature probe. It is adjusted according to the
temperature of the probe (see parameter F02=1) in cooling mode (see parameter F01=C). The con-
denser fan functions independently from the compressor, e.g. the fan is on even if the compressor is
off (see parameter F16=1)
Note: Analogue output AO is enabled as 0-10V output (F00=4) for piloting an external fan module.*
AUXILIARY (AUX1/2) - ventilation fans
Digital output OUT6 is configured as ventilation fans relay.
The auxiliary output is activated manually by pressing and releasing the AUX1-2 key (H)*
AUXILIARY (AUX1/2) - destratification fans
Digital output OUT7 is configured as destratification fans relay.
The auxiliary output is activated manually by pressing and releasing the AUX1-2 key (H). To prevent
stratification, e.g. when hot air inside the room rises to the ceiling and cold air falls to the floor, use
probe Pb3 as a stratification probe, positioning it in accordance with the room probe wiring (one
near the ceiling, the other near the floor). The fans switch on if Pb1-Pb3 as an absolute value (posi-
tive value) is greater than the SFd "difference" value and switch off after SFd-diS temperature differ-
ential.
SFd = 4.0°C difference to be compared with |Pb1-Pb3|
diS = 1.0°C differential
MINIMUM / MAXIMUM PRESSURE SWITCH
Digital input D.I. 3 is configured to manage the minimum pressure switch (low pressure)
Digital input D.I. 4 is configured to manage the maximum pressure switch (high pressure)
Pressure switch setting (default)
PEn = 15. Maximum number of low/high pressure error messages
PEi=99 min. The time interval, in minutes, for counting errors indicated by PEn. If during this interval the
number of responses from the pressure switch exceeds the indicated threshold, the instrument will report
a pressure switch error and power to the compressor, defrost and fans will be cut off. See Alarms Table*
*FOR MORE INFORMATION READ the manual, p/n 9MA10024
EWHT800LX 8 - EN