Chiltrix Inc. www.chiltrix.com
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How to Use Automatic Switch-Over
This is now an on-board function and does not require a separate add-on
controller to operate. This function allows the cx50 to automatically select its
mode, either heating, cooling, or standby (off), according to outdoor
temperature. This can be particularly useful for example, if a single cx50 is
shared by two different tenants, allowing the property manager to
(automatically) select the mode according to the actual outdoor weather
conditions.
There is a minimum of 5C (9F) deadband built-in so as to limit daily switching.
A suggested setting would be to run in heating mode when outdoor
temperature is 60F or below, use cooling when outdoor temperature is 69F
or above, and between 60-69 the system will be in standby (off) mode.
If your cx50 is used with a Psychrologix controller, please make sure the
Psychrologix auto-switchover function is disabled and only use the on-board
automatic switchover function. Or, vice-versa. Only one method of external
control can be used on the same system. Likewise, this function cannot be
used on either controller if you are using C-H-COM remote relay mode control.
To use this function, follow these 6 steps:
1. Make sure that C-H-Com are NOT being used. The jumpers that are supplied
should remain in place as shown on page 28
2. You must enable P112.
3. Note that P42 and P43 temperatures are in C not F.
4. The settings P42and P43 must be at least 4C different between
each other.
5. Result: If outdoor air drops below P42 the system will switch to heating.
6. If outdoor temperature rises above P43 the system will switch to cooling.
7. The default setting of P42 and P43 is 0. This means the autoswitch
function is disabled. P112 must be enabled to operate auto switch over.
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