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VCCX2 Controller Technical Guide
RSMZ Inputs Wiring
The RSMZ monitors and controls one refrigeration circuit of
the HVAC unit. The RSMZ is used on RZ units and on RN-E
units with Danfoss compressors. The module is designed for
R410-A refrigerant.
The RSMZ is connected to the VCCX2 Controller. Three or six
RSMZ Modules can be connected, depending on the size of the
system. There are two E-BUS Expansion Ports which allow the
use of communicating sensors and E-BUS modules. There is a
MODBUS terminal block which allows wiring to the Reheat
Expansion Module or VFD Compressor.
The RSMZ must be connected to an 18-30 VAC power source.
When wiring the RSMZ Controller, its relay outputs must be
wired as wet contacts (connected to 24 VAC). See Figure 38,
this page for input wiring.
WARNING: Observe Polarity! All boards must be wired
with GND-to-GND and 24 VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
ALARM
UP
DOWN
ENTERMENU
18-30 VAC
GND
Line Voltage
Size transformer for correct total
load. RSMZ Controller = 18 VA
COM
+
BK
RD
WH
RSMZ
Head Pressure
Transducer
Discharge
Temperature
Sensor
Compressor 1 Status
Compressor 1 Status
Oil Level Switch
Condenser Fan
Figure 38: RSMZ Inputs Wiring
WIRING
RSMZ Inputs
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