Firmware V3.15
21.04.2021
30/401
•
•
5.4.7 Two temperature zones
These controller types generally allow of controlling a line-up of maximum four refrigerated display cases with
one temperature zone (pilot case and three add-on cases) or two temperature zones (two pilot cases each with
maximum one add-on case).
The pilot cases detect the temperatures necessary for control and input control actuations to the cooling relay.
Temperature sensors of the add-on cases are largely monitored or used for defrosting.
Cold-room temperature controllers UR 141 NK (NT) and UR 141 TK (LT) allow of independently controlling two
temperature zones (two evaporators). Where required, the evaporators in cold-rooms can each be fitted with
two defrost sensors.
5.4.8 Heating circuit control
Controller type: UR 141 NK (NT) and UR 141 TK (LT) only
5.4.9 Operation of cooling relay
Operation of the cooling relay conforms to refrigeration safety requirements and is determined by the controller
type selected:
UA 111, UA 111 D, UA 141, UR 141 NK (NT): N.O. control, i.e. cooling is OFF when the case controller is
de-energized.
UA 121, UA 131, UA 131 DD, and UR 141 TK (LT): N.C control, i.e. cooling is ON when the case controller
is de-energized.
Damage to equipment and goods!
Faulty adjustment of setpoints entails the risk of damage to the
system and merchandise! The setpoint for the heating circuit must be set lower than for cooling.
As an alternative to a second temperature zone, the temperature in coldrooms can be controlled with
an auxiliary heating circuit. Heating circuit control comprises plain on-off control. The heating circuit
control relay energizes when temperature reaches the setpoint and hysteresis. It de-energizes when
the temperature exceeds the dead band.
In this instance the second zone must
not
be selected. Only then is it possible to adjust the setpoints.
In order to deactivate the heating circuit regulation the parameter
Ht. Cir. Setp.
(Menu 211 i.e. 213)
must be set to "--".
Summary of Contents for UA 400
Page 26: ...Firmware V3 15 21 04 2021 26 401 Solenoid valve Relay for Solenoid Valve 1 ...
Page 172: ...Firmware V3 15 21 04 2021 172 401 Service Mode 6 7 2 SERVICE MOD ...
Page 244: ...Firmware V3 15 21 04 2021 244 401 ...
Page 361: ...Firmware V3 15 21 04 2021 361 401 FANS 2 Pos XXXXX Fan Delay Fan delay ...
Page 372: ...Firmware V3 15 21 04 2021 372 401 ...