How To Connect Dry Contact - ECO2 Systems SANCO2 GS4-45HPC Installation Manual

How to Connect Dry Contact

Dry Contact Purpose
 U NIT START INPUT
・
Allow External ON/OFF switching of the Heat Pump –
Commonly used in Utility programs or other installations where having control of the Heat
Pump other than Tank temperature is required.
Note: Even should the unit be in the OFF mode via the Dry Contact the Freeze Protection
 If the unit is connected to Demand Response power and hot water consumption has
program may still start the unit depending on Ambient and Water temperatures.
been higher than normal, hot water might not be available until the next power
supply cycle.
 E RROR SIGNAL OUTPUT
・
Send an error to Utility programs.

Daily frequency and amount of hot water consumption may also affect the duration
of the heating cycle operation.
Installation of Dry Contact switching
Remove the pipe cover.
Locate the Dry Contact loop.
Figure 9: Outline of electrical system connections
Cut the loop and strip wire from the two ends.
Wire to external utility, note the maximum
voltage and current requirements.
CAUTION : If voltage is applied to the Dry contact terminal from the outside switch, the
equipment will be damaged.
Unit Operation
・
UNIT START INPUT
When the switch is in the OPEN position the unit is OFF
(Exception – Unit will run if Freeze protection mode is activated)
When the switch is in the CLOSED position the unit is ON
The unit will now be controlled by the Tank Temperature Thermistor
Unit will run if the Tank temperature is below 113°F as sensed by the thermistor
 E RROR SIGNAL OUTPUT
・
When an error has occurred, the switch is open.
The basic system installation is now complete; the unit is The basic system installation is now complete; the unit is
now ready for initial water filling, bleeding and then start up now ready for initial water filling, air purge and then start up
Check the Installation against the Installation Check list
Check the Installation against the Installation Check list
provided at the end of this manual
provided at the end of this manual
Ensure that the work site is tidy; Sanden International recommends the use of Slim Duct or
Fortress product to cover water piping on the outside of the house.
Cut
To Utility
208/230V Power
Ground Wire
SANCO
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SANCO Heat Pump – Installation Manual
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Page 16 of 44
UNIT START INPUT
Contact specification
Caution
Voltage 5V
Use copper wiring Current 2mA
Breaker Box
ERROR SIGNAL
OUTPUT