Heating And Cooling Coils 26 En - CIAT Climaciat Instruction Manual

Belt type
SPZ
SPA
SPB
SPC
During commissioning, the belt tension must be checked after 48 hours of operation.
9.5 Heating and Cooling coils
• Take all necessary measures to prevent the water in the coils from freezing during operation or when the air handling unit is
powered off.
- Install thermostats and/or safety pressostats.
- Glycol protection: Metering should be based on the temperature (see table below).
- This gives the minimum glycol concentrations based on the freezing point:
Concentration %
Ethylene glycol °C
Propylene glycol °C
Other products are available. Refer to the manual provided by the antifreeze supplier.
ƒ If you use a concentrated dilutable solution to protect your hydraulic circuit, please follow the instructions below:
- Never add pure antifreeze product followed by water,
- Always prepare the correctly metered water + antifreeze + corrosion inhibitor mixture in a container before adding it to the
system,
- Add the water/antifreeze/inhibitor and pressurise using a hydraulic pump,
- Circulate the mixture throughout the system for at least 2 hours before starting up the unit,
- Check the final metering obtained with a density meter or a refractometer,
- Check the pH obtained using strips of pH paper or a pH-meter (see water quality table below),
- Affix, in a visible location, a label stating:
- That the system contains antifreeze,
- The name of the product and the supplier,
- The metering and pH at system start-up.
ƒ If a top-up is required, it must be done using a mixture identical to that originally used. Same products, same metering, same
procedure.
ƒ During complete or partial draining, the water or coolant must not be drained directly to the sewer or the rainwater network.
Consult the regulations in force at the installation site.
ƒ Do not exceed the permissible pressure and temperature values. Refer to the unit's technical specifications.
ƒ The water or antifreeze mixture circulating in the heat exchangers must be filtered and must not contain any impurities, to
prevent fouling. The performance of a fouled heat exchanger will be severely reduced.
ƒ The water or antifreeze mixture must be correctly treated to prevent corrosion or attacks on the materials used.
Recommendations concerning the quality of the water used for the heat exchangers: See table below or regulations in force at
the installation site.
Load to be applied
per belt
f (N)
25
50
75
125
0
0
0
Small pulley diameter
mm
56 ≤ 71
< 71 ≤ 90
< 90 ≤ 125
125
71 ≤ 100
< 100 ≤ 140
< 140 ≤ 200
200
112 ≤ 160
< 160 ≤ 224
< 224 ≤ 355
355
180 ≤ 250
< 250 ≤ 355
< 355 ≤ 560
560
10 20
-3 -7
-4 -8
EN - 26
Belt deformation for a pulley centre
distance of 100 mm - E (mm)
2.45
2.20
2.05
1.90
3.20
2.75
2.55
2.45
3.00
2.55
2.22
2.10
2.55
2.20
2.00
1.90
30 40
-14 -24
-12 -20
50
-35
-33