Chiltrix Inc. www.chiltrix.com
Onboard External Relay/T-Stat Control
The internal T-Stat allows a heat pump thermostat or other external controller to control switching the
heating, cooling and standby modes of the cx50 via relay. This method of control generally requires a single-
stage standard heat pump thermostat, a installer provided 24 vac transformer and two relays, (Eg. Tyco K10P-
11A15-24, w/ two relay sockets, 27E487). The relays can be located in the chiller next to the IPM. The
transformer can be located in the home near the standard thermostat or other controller.
NOTE: THIS SHOULD NEVER BE USED FOR A HEATING OR COOLING “CALL”. IT IS ONLY FOR MODE
SELECTION. Heating or cooling calls are not needed or allowed with cx50, as it monitors the returning water
temperature and always knows what it needs to do.
NOTE: Before removing any jumper or connecting any relays, make sure of the following:
1. Enable/disable DHW, as applicable, at P08. Your selection will follow along with a change between heating and
cooling. If DHW is active (Parameter P08=1) DHW will work even when external relay control has the system “off”
(standby).
2. Use the controller Mode button to switch modes and set the target temperatures of each mode Heat, Cool and DHW,
before proceeding.
3. Auto-switchover (based on outdoor temp) at P42/P43 cannot be used when using this feature.
4. In order to use this function you must enabled P111.
27
IMPORTANT
The C,H, Com terminals are
DRY CONTACTS. Do NOT apply
Voltage to the contacts. Only connect
relays as explained.
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