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Space heating
All units can operate in space heating mode. The operation mode and setting temperature are set on the user
interface(2). Due to changes of the outdoor temperature and the required load indoors, multiple outdoor units
may operate at different times.
In cooling mode, SV3 (23.1) and P_C (23.2) keep OFF, P_O (5) keeps ON;
In heating mode, when both ZONE 1 and ZONE 2 work, P_C (23.2) and P_O (5) keep ON, SV3 (23.1) switches
between ON and OFF according to the set TW2.
In heating mode, when only ZONE 1 works, P_O (5) keep ON, SV2 (23.1) and P_C (23.2) keep OFF.
In heating mode, when only ZONE 2 works, P_O (5) keep OFF, P_C (23.2) keeps ON, SV3 (23.1) switches
between ON and OFF according to the set TW2.
AHS (Auxiliary heat source) Control
The AHS function is set on the user interface. (AHS function can be set valid or invalid in "OTHER HEATING
SOURCE" of "FOR SERVICEMAN".);AHS is only controlled by master unit. When master unit operate in heating
mode, AHS can be used for heating mode.
2) When AHS is set valid only in heating mode, it will be turned on in following conditions:
a. Turn on BACKUPHEATER function on user interface;
b. Master unit operates in heating mode. When inlet water temperature is too low, or while ambient
temperature is too low, the target leaving water temperature is too high, AHS will be turned on
automatically.
When AHS is valid, and the operation of AHS is controlled by M1M2. When M1M2 closes, AHS is turned on.
When master unit operates in DHW mode, AHS can't be turned on by closing M1M2.
1. Maximum 6 units can be cascaded in on system. One of them is master unit, the others are slave units.
Master unit and slave units are distinguished by whether connected to wired controller while powering
on. The unit with wired controller is master unit, units without wired controller are slave units. Only
master unit can operate in DHW mode. While installation, please check the cascade system diagram
and determine the master unit. Before powering on, remove all wired controllers of slave units.
2. SV2, SV3, P_O, T1, TW2, Tbt, AHS interface are only connected to corresponding terminals on main board
of master unit.
3. The system is with auto-addressing function. After initial powering on, the master unit will assign
addresses for slave units. Slave units will keep the addresses. After powering on again, slave units will
still use the previous addresses. The addresses of slave units aren't need set again.
4. If Hd malfunction occurs, please refer to 14.3 "Error codes"
5. It is suggested to use the reversed return water system in order to avoid hydraulic imbalance between
each unit in a cascade system
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