Frequently Asked Questions
Features and options:
Are bypass units/pneumatic (air side) controls available?
How do I control my unit if pneumatic controls are not available?
Without being able to control the airflow across the coil you can control the water flowing through the coil to achieve the same result. The valves used with the units can be controlled using simple thermostatic control, for both heating and cooling, very similar to what would be used in a fan coil, without tying into the outside air controls.
Alternatively the valves used with the units can be tied to the control system of the air handler responsible for providing the outside air to the units.
Is the electric heat option that was from the bypass units still available?
The electric heat will need a control signal to operate, typically from the thermostat or the building automation controls (tying into the incoming air control). The micro switch has been replaced with a contactor, which can be used to operate the electric heat. When using electric heat it is recommended that the airside controls are tied into the electric heat controls. This will help avoid nuisance tripping of the built in electric heat safeties due to heat buildup when airflow is not present.
What additional controls are available?
Provide the details of the custom control request and we can provide a price or an alternative. If a specific controls component or manufacturer is requested that detail should be included, with the relevant cut sheet and part number.
In extreme cases of custom controls the specification can be provided for Zehnder Rittling to review.
Please contact customer service for more information.
Can controls be factory mounted?
Are enclosures available for induction units?
Using a mullion style enclosure with a bar grille outlet as the basis for most applications enclosure can be provided to address single unit, multiple unit or full wall run applications, enclosing everything from the unit, to the piping, duct runs and cut outs. Enclosure is made from heavy gauge sheet metal and finished in standard powder coat finish.
Typical design drawings are available or applications can be customized to meet the space needs.
Please contact customer service for more details.
Are valve packages available?
Can valve packages be provided?
Please contact custom service for more information.
Why does the standard drip pan not have a drain connection?
There is an option to add a drain connection to the pan in cases where the incoming air is not properly treated or operable windows are present, affecting the space humidity.
Why do some units require clearance from the floor or the wall?
The HC/H4C style units require a clearance before the coil/drain pan to ensure the necessary airflow due to the drain pan being located directly below the coil. This would block any airflow from directly below the unit. This limitation would not apply to a cabinet with a rear inlet, but the cabinet would require the clearance from the wall.
How do I order replacement parts?
Once customer service has the information they will provide you with a quote for the item, including price and availability.