Hoffman Controls 890-DSQ Series Complete Installation & Operating Instructions page 11

Installation Con't
The 890-DSQ Sequencer is conformally coated but
must be protected from moisture and condensation
if installed in high humidity areas or outdoors.
The 890-DSQ Series Sequencers may be installed using a range of inputs, staged relay
outputs, and continuously variable speed EC motors or SCR outputs. Refer to Figures 5
thru 8, (pages 12 thru 15), for the appropriate wiring diagram(s) for this application. More
than one wiring diagram's information may be required when installing the 1) Modbus
connection, 2) secondary set point contact closure, 3) 0 - 10 VDC input or 4) VS (variable
stage) EC motors or SCRs.
1) Wiring must comply with local and national electrical codes.
Disconnect power from the condenser fan motors
and heating system to ensure the motors and
heater elements are electrically disabled prior to
2) Disconnect all factory wiring connecting the load (motors, SCRs etc.) to the line.
3) Refer to Figure 4, Location of 890-DSQ Sequencer's Variable Stage Output,
(below), for the location of the sequencer's variable stage's PWM and VDC output
terminals.
4) Refer to Figure 5, 890-DSQ Wiring Diagram 1, (on page 12) for applications
using staged relay outputs with temperature sensor inputs. Also see Figure 6, Liquid
Line Temperature Sensor Mounting (on page 13 ) for liquid line temperature sensor
mounting.
a. Mount temperature sensor on top of the liquid line where the line exits the condenser
coil.
11
NOTE:
WARNING:
installation.
JP1
T
P