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i. Precaution for very low outdoor temperatures
In case of installation conditions with a very low temperature:
If there is a storage on board the unit, insert electric resistances to be calculated by:
PrWatt = V x (10 – tmin) / 860
where: PrWatt is the resistance power (Watt) and tmin is the lower temperature (°C)
If there is no storage, maintain the water temperature higher than 10°C by inserting thermostatic resistance with
power calculated as in case 1.
ANTIFREEZE PROTECTION ON THE HEAT EXCHANGER
c.
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 (they are not included in the Low ambient kit down to -
10°C) for the protection of all the components of the hydraulic circuit inside the unit (pumps, pipes and tank).
For selection and price; contact your local Trane 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 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 pumps is not managed by the unit controller. The owner or
local maintenance personnel must provide appropriate solutions to prevent freezing.
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