___________________________________________________________________________ NT 1965 A - 03/201935
Correspondence between temperature sensors/Ohmic value:
Temperature
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Ohmic value
329.5
247.7
188.5
144.1
111.3
86.4
67.7
53.4
45.5
34
27.3
Temperature
5
10
15
20
25
30
35
40
45
50
55
Ohmic value
22
18
14.7
12.1
10
8.3
6.9
5.8
4.9
4.2
3.6
Temperature
60
65
70
75
80
90
95
100
105
110
Ohmic value
3
2.6
2.2
2
1.7
1.3
1.1
0.9
0.8
0.7
9.3
MAINTENANCE RANGE
Operation description
Frequency
Competence level
Average time
required (hours)
H
M
T
S
A
Other
Recovery unit
Check the unit for leaks (doors, panels, gaskets, etc.)
O
T
0.5
Check for pressure drops in the filters (replace if necessary)
O
T
0.2
Check the integrity of the filters excluding the absolute high
efficiency particulate air (HEPA) filter
O
T
0.5
Replace the pre-filters
O
T
1
Check the condition and tension of the belts
O
T
1
Perform an auditory check of the bearings and belts
O
T
0.2
Check and lubricate the bearings and rollers
O
T
0.2
Check the alignment of the pulleys
O
T
1
Measure the currents
O
T
0.2
Check the safety mechanisms, servo-systems and alarms
O
T
1
Measure the flow rates
O
T
0.5
Check the frost protection thermostats
O
T
0.5
Check the control system, the 3-way valves (V3V) and the
dampers
O
T
0.5
Check the flexible sleeves
O
T
0.2
Clean and disinfect the casing fans
O
T
1
Operate the isolation valves
O
T
0.2
Retighten the electrical connections
O
T
0.5
Check the condensate tank outflow and clean and prime the
siphons if necessary
O
T
0.5
Heating/cooling coils and heat recovery unit
Check the condition (dust, corrosion, leaks)
O
T
0.2
Check the upstream and downstream temperatures
O
T
0.2
Check the operation of the circulation pump for the recovery
unit coils
O
T
0.2
Clean, descale and remove sludge
O
T
0.1
Electrical cabinets/distribution boards
Perform a visual inspection
O
T
0.2
Clean the cabinet
O
T
0.5
