Controller inputs and outputs – WattMaster WM-WCC3-TGD-01B User Manual
Page 774
VAV/Zone Controller Technical Guide
Operator Interface
6
3 Stage Heating Applications
If three stages of electric heat are confi gured, relays #2 and #3 will stage
in a staggered sequence. This allows you to achieve 3 stages of heating
using only relays #2 and #3. Each of the 3 heating elements should be
sized for ⅓ of the total KW output required. Both the 2nd and 3rd stage
heating contactors (C2 & C3) must be connected to Relay Output #3.
See Table 1 for relay sequencing information.
Stage No.
Relay Output #2
Relay Output #3
#1
ON (C1)
OFF (C2 & C3)
#2
OFF (C1)
ON (C2 & C3)
#3
ON (C1)
ON (C2 &C3)
Table 1: Relay Sequencing For 3 Stage Heating
24 VDC Power Terminals (+V & GND)
These terminals can supply 24 Volts DC for a 24 VDC hot water valve
actuator if desired. This output is rated at 12 Watts maximum load.
Analog Output
If you are using hot water or steam heating via a modulating steam
or hot water valve, this output can supply a 0-10 Volts DC signal for
proportional control of the valve.
Controller Inputs and Outputs