MTA HAST 080 N - Forced Ventilation of the Electrical Board; Antifreeze Control

MAINTENANCE AND OPERATING MANUAL
Functions and components of the unit
HAS T 070÷140
91
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
ATTENTION
MTA sets the level sensor to operate with sensitivity of 250kOhm (setting A=5, B=H on “Empty” side).
The level sensor is set by the producer and its calibration must not be modified.
ATTENTION
An anti-tamper label is applied over the setting trimmers (A and B).
Total or partial damage to this label will result in forfeiture of warranty rights.
7.6 Forced ventilation of the electrical board
The circulation fan is controlled by a thermostat positioned inside the electrical panel. It starts when the temperature inside
the electrical panel exceeds the thermostat’s set point.
The setpoint value is 40°C.
The differential value, 4°C, is fixed.
7.7 Antifreeze control
Antifreeze control actions depend on the temperature measured at the evaporator outlet.
When the temperature falls below the previously set antifreeze threshold value the controller generates an alarm that shuts
down the unit.
This alarm will remain active until the temperature returns to a value above the set-point + differential.
BA
Turn the trimmer B to change the sensitivity
range of the regulator A
L
250
 ÷ 5 K
S
5 K
 ÷ 100 K
H
50 K
÷ 500 K
ON
OFF
Electrical panel fan state
DIFFERENTIAL (Fixed)
SETPOINT
Temperature
Temperature inside
the electrical panel