WFCO EM-15 Guida per l'amministratore

Installation & Operator’s Manual

WF-9900 Series

EM-15 / EM-20 Energy Management Switch

SAFETY INFORMATION ........................................................................................................... 3

EM-15 / EM-20 OPERATION

Introduction ................................................................................................................................... 3

Product Description ....................................................................................................................... 3

Modes of Operation ..................................................................................................................... 4

EM-15 Power Relay Mode ....................................................................................................... 4

EM-20 Power Relay Mode w/ Short Delay ............................................................................5

EM-20 Power Relay Mode w/ Long Delay ............................................................................ 5

EM-20 Logic Relay Mode w/ Short Delay ............................................................................. 5

EM-20 Logic Relay Mode w/ Long Delay ............................................................................ 6

EM-20 Remote Control ................................................................................................................ 6

EM-20 Remote Panel Functions .................................................................................................. 7

EM-15 / EM-20 INSTALLATION

Mounting the Enclosure ................................................................................................................ 7

Mounting to a Wall or Floor ........................................................................................................ 8

Mounting to a WF-89xxPEC ...................................................................................................... 8

Mounting to a WF-85xx ............................................................................................................... 8

Mounting the EM-20 Remote Control ....................................................................................... 9

EM-15 / EM-20 WIRING

System Wiring Diagram ..............................................................................................................10

Internal EM-15 / EM-20 Wiring ............................................................................................... 11

Wiring Instructions ..................................................................................................................... 12

Air Conditioner Logic Wiring for the EM-20 ......................................................................... 12

EM-15 / EM-20 TROUBLESHOOTING .......................................................................13

SPECIFICATIONS ............................................................................................................. 14

APPENDIX A ........................................................................................................................ 15

Timing Diagram Example ........................................................................................................... 15

GENERAL COMPLIANCE INFORMATION ............................................................ 16

TABLE OF CONTENTS

!WARNING!

Risk of Electrical Shock. Disconnect or isolate all power supplies before making electrical

connections. More than one disconnection or isolation may be required to completely

de-energize equipment. Contact with components carrying hazardous voltage can cause

electric shock and may result in severe personal injury or death.

!IMPORTANT!

All wiring must conform to local, national, and regional regulations. Use copper conductors

only for all wire connections. Do not exceed the electrical ratings for the EM-15 / EM-20 or the

equipment connected to it.

!CAUTION!

is product should be installed by an experienced technician. CAUTION and care must be

taken when servicing this equipment. To prevent severe shock or electrocution, consult your

servicing dealer.

!WARNING!

is unit employs components that can produce arcs or sparks. To prevent re or explosion, do

not install in compartments containing batteries or ammable materials (LP gas). is product

is NOT ignition protected.

EM-15 / EM-20 OPERATION

Introduction

e EM-15 / EM-20 is a cost-ecient, energy management branch circuit expander. is

product is designed to share the power from a single branch circuit between two mid-to-large

power loads that normally require their own breaker. Potential applications include microwaves,

replaces, hairdryers, water heaters, or even two air conditioners. RVs with two or more air

conditioners frequently require 50A AC service; however, the EM-20 can be employed to

manage two air conditioners in an RV with 30A service.

All WFCO products are designed to better meet the needs of RV owners while also making

the job simpler for the installer. e EM-20 oers three exible mounting options, as well as, a

number of unique features – like four basic power modes and a remote panel for manual energy

management – making it easy for RV owners to assign energy to the circuit they need at any

particular time. e EM-15 also oers three exible mounting options, and can quickly be

utilized wherever there is a need for energy management on a 15A branch circuit.

Product Description

e EM-15 / EM-20 is an Energy Management Switch designed to be used in recreational

vehicles to share the power from a single 15A / 20A branch circuit between two mid- to large-

loads. e device applies power to both loads until the total loaded current exceeds

approximately 13.5A / 18A. It then cuts the power to the secondary load to prevent the 15A /

20A circuit breaker from tripping while maintaining the primary load. e secondary load will

be restored automatically when the total loaded current drops below a preset level (~5A).

e EM-15 / EM-20 default primary (priority) branch is Circuit A. e secondary load (which

may be shut o) shall be wired to Circuit B.

Modes of Operation

EM-15 Power Relay Mode:

e EM-15 has a single mode of operation for the following application: sharing the

power between two appliances on a 15A breaker (for example: a microwave and a replace

or water heater).

is mode of operation functions as follows: Power is applied to the EM-15. Aer a short

delay of approximately 4 seconds, power will be supplied to both the primary and sec-

ondary circuits. e EM-15 constantly monitors current levels, and will shut down the

secondary circuit once levels reach approximately 13.5A. Once the current levels have

dropped below approximately 5A, power will return to the secondary circuit.

EM-20 Modes:

e EM-20 has 4 basic modes of operation.

1. Power Relay Mode w/ Short Delay

2. Power Relay Mode w/ Long Delay

3. Logic Relay Mode w/ Short Delay

4. Logic Relay Mode w/ Long Delay

e mode can be switched using the red & white switch located inside the EM-20. If the

mode is changed it will require the power to be cycled OFF then ON before the EM-20

will recognize the new mode. e EM-20 implements these modes through 4 dierent

internal relays (2 high current power relays and 2 low current logic relays).

Power Relay vs Logic Relay:

In Power Relay Mode, when faced with an over current condition, the power for the entire

secondary circuit shuts OFF.

In Logic Relay Mode, when faced with an over current condition, the power for the

secondary circuit always remains ON, while a “logic relay” switches states.

Logic Relay Mode expects the load to manage its’ own power. is is a very important

distinction! Logic Relay Mode shall NOT be used unless the load is designed to be used

with an energy management system, and has inputs which expect a simple, low power

relay switch closure.

Long Delay:

When an air conditioner is in operation, its compressor circulates refrigerant under high

pressure. Once OFF, it will take 2-3 minutes for this high pressure to equalize. For this

reason, the EM-20 adds an o-time delay of approximately 3 minutes. is delay will

prevent “short cycling” the compressor and will also be observable during the initial

power ON sequence of the EM-20.

EM-20 Power Relay Mode w/ Short Delay:

is mode shall be used when two appliances (without compressors) are sharing the same

circuit breaker (for example: a microwave and a replace or water heater).

Power is applied to the EM-20. Aer a short delay of approximately 4 seconds, power will be

supplied to both the primary and secondary circuits. e EM-20 constantly monitors current

levels, and will shut down the secondary circuit once levels reach approximately 18A. Once the

current levels have dropped below approximately 5A, power will return to the secondary circuit.

EM-20 Power Relay Mode w/ Long Delay:

is mode shall be used when attempting to combine two loads with compressors that are not

set up to use logic relays.

Power is applied to the EM-20. Aer a delay of approximately 3 minutes, power will be supplied

to both the primary and secondary circuits. e EM-20 constantly monitors current levels, and

will shut down the secondary circuit once levels reach approximately 18A. e “OFF time delay

timer” is then triggered. Once the timer has expired, and the current levels have dropped below

approximately 5A, power will return to the secondary circuit.

EM-20 Logic Relay Mode w/ Short Delay:

is mode shall be used when attempting to combine two air conditioners on one 20A breaker.

ese air conditioners shall be equipped with energy management system inputs and have the

ability to use logic relays for compressor control. THIS MODE SHALL ONLY BE SELECTED

IF THE AIR CONDITIONER CONTROL CIRCUITRY PROVIDES THE NECESSARY OFF-

TIME DELAY ITSELF TO PREVENT SHORT CYCLING THE COMPRESSOR.

Power is applied to the EM-20. Aer a short delay of approximately 4 seconds, power will be

supplied to both the primary and secondary circuits. Both power relays will continue to stay on

for as long as there is power applied to the EM-20. e control is performed through the logic

relays. e EM-20 constantly monitors current levels, shutting down (energizing) the secondary

logic relay when levels reach approximately 18A. Once the current levels have dropped below

approximately 5A, the secondary logic relay will be de-energized.

EM-20 Logic Relay Mode w/ Long Delay:

is mode shall be used when attempting to combine two air conditioners on one 20A

breaker. ese air conditioners shall be equipped with energy management system inputs

and have the ability to use logic relays for compressor control. THIS MODE SHALL BE

SELECTED IF THE AIR CONDITIONER CONTROL CIRCUITRY DOES NOT PRO-

VIDE THE NECESSARY OFF-TIME DELAY ITSELF TO PREVENT SHORT CYCLING

THE COMPRESSOR.

Power is applied to the EM-20, aer a short delay of approximately 4 seconds, power will

be supplied to both the primary and secondary circuits (also triggering the “OFF time

delay timer” of approximately 3 minutes) and the logic relays will be energized. Both

power relays will continue to stay on for as long as there is power applied to the EM-20.

e control is performed through the logic relays. Once the “OFF time delay timer” has

expired the EM-20 de-energizes the logic relays, and will constantly monitor current

levels, shutting down (energizing) the secondary logic relay when levels reach

approximately 18A. e “o time delay timer” is then triggered. Once the timer has

expired, and the current levels have dropped below approximately 5A, the secondary logic

relay will be de-energized.

EM-20 Logic Relay Operation Detail:

e EM-20 logic relays provide dry relay contacts (simple low current switch closure) and

operate as follows: Under normal operation with both circuits ON, the logic relays will be

de-energized (relay common connected to the normally closed contacts). When the total

current exceeds the upper trip limit, the logic relay for the secondary channel is energized

(relay common connected to the normally open contacts).

For wiring air conditioners with energy management logic capabilities please refer to the

Air Conditioner Logic Wiring section.

EM-20 Remote Control

e EM-20 remote control allows the user to easily specify which circuit should always

remain ON, in the event that appliances on both branches require too much power. e

LEDs indicate which branch will be Primary, allowing the other branch to be shut OFF.

Pushing the button (until a so click is felt) will change the preference. e LED for the

circuit indicating the primary branch will change immediately as soon as the button is

pressed.e background relay activation will occur aer a short delay of approximately 4

seconds.

EM-20 Remote Panel Functions

Function: Set Circuit Priority

EM-15 / EM-20 INSTALLATION

Mounting the Enclosure

e EM-15 / EM-20 has primarily been designed for three dierent mounting congura-

tions. A simple rotation of the mounting bracket facilitates the dierent congurations.

1. Wall/Floor Mounting.

2. Back of WFCO WF-89xxPEC Power Centers.

3. Back of WFCO WF-85xx Power Centers.

Circuit A LED is Illuminated

NO Remote Installed

Circuit B LED is Illuminated

Circuit A is always available Circuit B is always available

Circuit B drops out on over-current

condition

Circuit A drops out on over-current

condition

Mounting to a Wall or Floor

Bracket Position:

Mounting to a WF-89xxPEC

Bracket Position:

e brackets will slide into the slots on the back of the power center, with the screws in the

top of the power center going through the bracket to hold it in place.

Mounting to a WF-85xx

Bracket Position:

No bracket is necessary. e mounting holes for the bracket on the EM-15 / EM-20 have

corresponding holes on the back of the 85xx series power centers. Remove the brackets

and use the bracket screws to mount the EM-15 / EM-20 directly to the back of the power

center.

Mounting the EM-20 Remote Control

e remote-control panel should be mounted in an easily accessible location. e supplied

remote cable shall be routed from the remote location to the EM-20.

EM-15 / EM-20 WIRING

System Wiring Diagram

For 20A applications, use 12AWG copper conductors only. For 15A applications, use

14AWG copper conductors only.

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