16 EPU‐D Installation and Operation Manual
059840‐00 Rev. A
Heat‐Timer Corp.
Wiring the EPU‐D
Power Input Wiring
1. De‐energize the circuit that will provide power to the EPU‐D by turning off the appropriate circuit breaker.
2. Run the 120Vac power wiring through one of the knockouts located on the
bottom of the EPU‐D enclosure.
3. Connect the hot line to terminal 1 on the EPU‐D.
4. Connect the neutral line to terminal 2 on the EPU‐D.
5. Connect terminal 3 on the EPU‐D to earth ground.
DO NOT
use the neutral line
as the earth ground!
Output Wiring
NOTE: The EPU‐D outputs do not source power. If power is needed at a specific output, a separate power
source must be wired in series with the output. Each output relay can switch a 6A resistive load at 120Vac or
a 1A inductive load.
WARNING
ELECTRICAL SHOCK HAZARD! Disconnect electrical power to the device before servicing or making
any electrical connections. Failure to do so may result in severe personal injury or death.
Use a separate circuit breaker for the control. Do not share the control power with other major
equipment, pumps, or motors. Heat‐Timer recommends the installation of a surge suppressor and a
power switch before the power line connection.
Follow all local and state electrical codes when installing this unit. All wiring must meet or exceed
local, state, or federal codes and requirements.
CAUTION
The input power wires must be N.E.C. Class 1. Class 1 voltage wiring must
use a different enclosure knockout and conduit than any sensor wiring.
WARNING
ELECTRICAL SHOCK HAZARD! To avoid the risk of electric shock, DO NOT
re‐connect electrical power until ALL wiring to the EPU‐D is completed.
Failure to do so may result in severe personal injury or death.
CAUTION
Class 2 voltage wiring (low‐voltage sensor wires) must use a different enclosure knockout
and conduit than any Class 1 voltage wiring.
