VEAB CWW, Manual

CWW / CWK / CFW / CFK

3

WATER CONNECTING

When connecting a heater/cooler to the water system, the 

following things should be considered:
1. 

The heater / cooler must be connected according to the 
applicable regulations. 

2.  The connecting pipes from the heat exchanger must 

under no circumstances be subjected to twisting or 

bending stresses when assembling the pipe connectors 

etc. Use suitable tools to counteract the twisting/bending 

moments during assembly.

3.  Ensure that forces due to expansion in the system and 

the inrinsic weight of the piping system itself  do not put 

loads on to the heat exchanger.

4.  The water inlet should normally be connected to the 

lowest pipe connector in order to facilitate venting of the 

heat exchanger. A venting valve should normally be 

installed near the heat exchanger or at the highest point 

in the system.

5.  The heater/cooler must be connected in such a way that 

the system is easy to empty in the event of repair work, 

a longer operational stop, or when there is a risk of 

freezing, etc.

6.  Immediately after the system has been filled with water, 

the duct heater and its connections must be checked for 

water leaks. Leaks can cause water damage.

Operational data: 

Max. operating temperature:  150°C

Max. operating pressure: 

1,0 MPa (10 bar)

WARNING!! 

If the water in the heat exchanger freezes, then it can burst, 

if this is the case water may leak from the system and cause 

water damage. Therefore, when there is a risk of freezing the 

heater/cooler must be protected by a freezing sensor which 

shuts down the system fans, shuts any outside air valves, opens 

the water valve to increase the water circulation through the 

heat exchanger, and activates the alarm circuit (if there is one). 

CLEANING

The heat exchanger must be cleaned regularly in order to 

retain the best performance from the heater/cooler. The 

cleaning interval depends entirely on the cleanliness of 

the air and how the filter and remainder of the system are 

maintained.

The heat exchanger is readily accessible for cleaning when 

the cover on the heater/cooler is removed. First, the air entry 

side of the heat exchanger is cleaned with a brush and then 

the whole heat exchanger can be cleaned with compressed 

air, water or steam. The dirt is blown or washed away in a 

direction away from the exit side towards the entry side. 

Cleaning is facilitated by using a mild detergent (check first 

that the detergent does not have a detrimental effect on 

copper and aluminium).

Be careful not to damage the thin fins on the heat exchanger.

CWK

Drain
G 1/2

MOUNTING

The heater/cooler is designed to be inserted into standard 

spiral ducting and is fixed to the ducting with screws.

The heater/cooler should not be fitted too close to a fan outlet 

or a bend in the ducting because then there is a risk that the 

air flow through the heat exchanger is uneven which can 

result in lower efficiency.

An effective filter is recommended in the system to reduce 

maintenance work. See under the heading Cleaning.

DUCT HEATER MODEL CWW / CFW

The duct heater can be fitted in a horizontal or a vertical duct 

with optional direction of airflow.  CWW/CFW duct heating 

for hot water in round ventilation ducts.  

CFW is insulated with 50 mm rock wool in a double-shell 

housing. To facilitate venting of the heat exchanger, the unit 

should be fitted with the longitudinal tubes horizontal. The 

heater is normally fitted after the fan. However it can be fitted 

before the fan, but then a check must be made that the fan 

motor and other components are approved for the elevated 

temperature after the heater.

DUCT COOLER MODEL CWK / CFK

The duct cooler must be fitted in a horizontal duct and the 

airflow must be in the direction of the arrow. The CWK/

CFK must be insulated externally to prevent the formation of 

condensation on its outside surfaces. 

CFW is insulated with 50 mm rock wool in a double-shell 

housing.  

Normally, the ducts that transport cold air must also be 

insulated to prevent condensation. A drain pipe is required 

to drain off any condensed water. To prevent unnecessary 

condensed water remaining in the duct cooler, it must be 

tilted at an angle of 10-15 degrees to the horizontal in 

the direction of the drain. See the picture below. Drain 

connection is G 1/2. The duct cooler must be connected to 

the drain in such a way that the connection is protected from 

pulling, pressing or twisting. Otherwise there is a risk of water 

leakage.

GB

/

CFK