Trane CCUF-R454B - Water Treatment Recommendations; Winter Evaporator Freeze Protection

Page 19
7.2 WATER TREATMENT
Before putting the unit into operation, clean the hydraulic circuit. Dirt, scales, corrosion residue and other extraneous material can
accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drops can increase, as well, thus reducing
water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc. The most appropriate water
treatment must be determined locally, according to the type of system and to the local characteristics of the process water.
Trane is not responsible for damage to or malfunctioning of the equipment caused by failure to treat water or by improperly treated
water
Table - Acceptable water quality limits
PH (25°C) 6,8÷8,0
Total Hardness
(mg CaCO
3
/ l)
< 200
Electrical conductivity
S/cm (25°C)
< 800 Iron (mg Fe / l)
< 1.0
Chloride ion
(mg Cl - / l)
< 200
Sulfur ion
(mg S
2-
/ l)
None
Sulphate ion
(mg SO
24-
/ l)
< 200
Ammonium ion
(mg NH
4+
/ l)
< 1.0
Alkalinity
(mg CaCO
3
/ l)
< 100
Silica
(mg SiO
2
/ l)
< 50
7.3 WINTER FREEZE PROTECTION ON THE EVAPORATOR EXCHANGER
Two or more protection methods should be foreseen when designing the system as a whole:
1. Continuous water flow circulation inside piping and exchanger when ambient air temperature is holding below 5 °C. This
implies what follows:
- if the water flow inside piping and exchanger of the unit is due to an external pump installed by the customer, the on/off
command of this pump must always be the one provided by the unit controller through the relevant free potential contact in
the electrical cabinet.
- as long as the ambient air temperature is holding below 5 °C the unit must always be electrically supplied. Moreover the
customer pump, if present, must always be electrically supplied alike and functioning properly.
2. Addition of an appropriate amount of glycol inside the water circuit.
3. Additional heat insulation and sufficient heating of exposed piping.
IMPORTANT: Trane can provide various optional kits called for the protection of all the components of the hydraulic
circuit inside the unit (pumps, pipes and tank). If you want to buy any please contact Trane .
4. Emptying and cleaning of the heat exchanger during the winter season.
It is the responsibility of the installer and/or of local maintenance personnel to ensure two or more of the described antifreeze
methods. Continuously verify, through routine checks, that appropriate anti-freeze protection is maintained.
Failure to follow the instructions above could result in damage to some of the unit’s components. Damage from freezing is not
covered by the warranty.
CAUTION: The unit water pipes are not protected against the risk of water freeze-up when the unit is not electrically powered and
when the power and control of the external water pump is not managed by the CCUF unit controller. The owner or local
maintenance personnel must provide appropriate solutions to prevent freezing.
CAUTION: A power loss of 15 minutes during freezing can damage the evaporator.