V.a) Installation Scheme; V.a.1) Scheme 1/17 - Basic; V.a.2) Scheme 2/17 - One Tank - Order; V.a.3) Scheme 3/17 - Two Collectors, Two Pumps - TECH ST-402N PWM User Manual

ST-402N User's Manual v 1.0.3
V.a) Installation Scheme
In order for the solar installation to operate correctly, it is necessary to properly select the appropriate
installation scheme (SERVICE MENU > INSTALLATION SCHEME), as well as to adequately configure the
additional options of the selected system.
CAUTION
During the selection of the installation scheme, the number of a given sensor is found near the values
of the sensors' temperatures. Relevant sensors should be connected to the relevant sensor slot
according to these numbers (in order from the left):
(1) – Collector Sensor (PT1000),
(3) - Additional Sensor 1 (PT1000), (4) – Additional Sensor 2 (PT1000).

V.a.1) Scheme 1/17 - Basic

Installation 1/17 Operates:
 The Collector Pump.
 The Accumulation Tank.
 One direction of the collectors' location.
 Additional peripherals.
Installation Sensors:
 The Collector's sensor.
 The Accumulation Tank's sensor.
V.a.2) Scheme 2/17 – One Tank - Order
Installation 2/17 Operates:

The Collector Pump.
 The Switching Valve (top-bottom).
 The Accumulation Tank with top and bottom circulation.
 One direction of the collectors' location.
 Additional peripherals.
Installation Sensors:
 The collector's sensor,
 The two sensors of the Accumulation Tank – top and bottom.
Additional Parameters to be Adjusted:
 Valve Hysteresis.
 Oscillation charging.
 The oscillation pause time.
 Maximum heating time Z2.
V.a.3) Scheme 3/17 – Two Collectors, Two Pumps
Installation 3/17 Operates:
 The two Collector Pumps (the pumps operate independently,
each according to its own circulation).
 The Accumulation Tank.
 The two directions of the collectors' location.
 Additional peripherals.
Installation Sensors:
 The two collector sensors.
 The Accumulation Tank's sensor.
Note:
Setting the Solar Collector option (SERVICE MENU > SOLAR COLLECTOR) applies equally to collectors
situated in both directions.
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(2) – Container Sensor (PT1000),