Trane CGWF SE - Page 21

Page 22
7.2 CONDENSER
Condenser piping must follow the installation features represented in the paragraph 7.5 HYDRAULIC VERSIONS
Condensing temperature and water flow rate have to be in accordance with nominal values, unless the acknowledgement order
shows different indications. It is strictly necessary that in the presence of condenser side dirty or aggressive water, an intermediate
heat exchanger must be installed before the condenser.
Condenser nominal pressure (PN) = 16 bar.
7.3 WATER TREATMENT
Before putting the unit into operation, clean the hydraulic circuit. Proper water treatment reduces the risk of corrosion,
erosion, scaling, etc. Contact a local water treatment specialist.
Trane is not responsible for damage to or malfunctioning of 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
7.4 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 5ᴼC. 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 5ᴼC the unit must always be electrically supplied.
Moreover the customer water 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 kits (optional) for the protection of all the components of the
hydraulic circuit inside the unit (pumps, pipes and tank). For a proper selection and price please
contact your local Trane Sales & Service office.
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 anti-
freeze methods. Regularly verify, through routine checks, that appropriate anti-freeze protection is maintained.
Failure to follow the instructions above could result in damage to one or more of the unit’s components.
Damages caused by freezing are 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 CGWF SE/CGWF
HE/CXWF 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.