SECTION 8: OPTIONAL HEATER CONFIGURATIONS
SECTION 8: OPTIONAL HEATER CONFIGURATIONS
8.1Distribution Duct Work for CTUB, CTUC and CTUD Heaters
CTUC heaters have the fans enclosed so that the heater may be connected to inlet ducting.
CTUD heaters are supplied with inlet and outlet duct spigots for mounting the heater into a customer designed duct system for use with an external fan system.
It is recommended that flexible duct connectors are used to reduce duct born noises.
When installing CTUD heaters onto ducting force the fan to run.
Do not rely on the fan thermostat to turn it on. Any such device must be in parallel with the fan thermostat so that the fan
Contact
8.1.1 CTUD Heaters
For CTUD heaters, it is essential that the airflow in the duct system is at least that specified in the Data Sheet on Page 6, Section 4.2 and in the correct direction across the heat exchanger as indicated by the arrow on the heater. Higher air flows are permitted, but will cause a lower exiting air temperature. It is recommended that the fan is positioned to blow the air through the heat exchanger.
The duct must be designed as described on Page 13, Section 8.1 and Figure 8 to ensure that there is a homogenous air flow across the whole of the heat exchanger.
Failure to provide a suitable air flow properly distributed across the heat exchanger will reduce the life of the heat exchanger.
The fan motor, or its control, must contain a method of overload protection. When installed remote from the heater, the fan must be supplied via a local electrical isolator positioned and properly labeled to prevent inadvertent operation.
Figure 8: Ducting
NOTE: Duct size will be full size of inlet and outlet. All joints between the heater and duct work should be made as air tight as possible.
Airflow Indicator
Minimum-
Twice
Dimension
“X”
Minimum-
Twice
Dimension
“X”
Dimension
“X”
Ducting
Flexible Flange
Ducting
13
