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SA E-BUS Controller Technical Guide

Inputs & Outputs

SA E-BUS Controller Outputs and SA Expansion Module I/Os

SA E-BUS Controller Outputs

AO1 - Water Side Economizer Valve Signal

This 2-10 VDC signal is used to modulate the Water Side Economizer

valve(s) of either a single SA Unit or a dual SA Unit during Water Side

Economizer operation.

AO2 - Supply Fan VFD

This voltage signal (0-10 VDC) can be connected to a Supply Fan VFD

or to Proportional Inlet Vanes to control the Duct Static Pressure. This

signal can also be connected to a 0-10 VDC Modulating Zoning Bypass

Damper Actuator to control Duct Static Pressure. When this signal is

used to control a Zoning Bypass Damper Actuator, the Zoning Bypass

Damper Actuator needs to be mechanically conﬁ gured to close the Zon-

ing Bypass Damper on an increase of the 0-10 VDC output signal. This

is necessary because the signal is Direct Acting and is not conﬁ gurable

as a Reverse Acting Signal on the SA E-BUS Controller.

R1 - Supply Fan (Enable)

This is reserved for the Supply Fan and cannot be conﬁ gured for any

other option.

R2-R5 - User-Conﬁ gurable Relays

These relays are conﬁ gurable by the user. For all the available conﬁ gura-

tion options, see Table 2 on page 40.

By using all (4) of the available relay outputs on the SA E-BUS Control-

ler, all (4) of the relay outputs on the SA Expansion Module, and all 12

of the relay outputs on the 12 Relay Expansion Module, you have the

ability to conﬁ gure up to a combined total of (20) relay outputs for Heat-

ing Stages, Cooling Stages, and options 3 through 10 listed in Table 2.

NOTE: The Binary Inputs require wet contacts (24 VAC only) to

recognize an active input. If you provide dry contacts, the contact

closure will not be recognized.

SA Expansion Module Inputs and

Outputs

AI1 - Entering Air Humidity Sensor Input

This input is used to connect an Entering Air Humidity Sensor that

when combined with the Entering Air Temperature Sensor reading is

used to calculate a Dewpoint Temperature. The Entering Air Dewpoint

Temperature is used to activate the Dehumidiﬁ cation Mode on Entering

Air conﬁ gured units.

AI2 - Indoor Air Humidity Sensor Input

The Indoor Air Humidity Sensor is used to activate Dehumidiﬁ cation

Mode when the unit is conﬁ gured for Supply Air Control or Space

Temperature Control on a VAV or CAV unit. This sensor can be used as

a reset sensor for Entering Air Controlled units.

AI3 - Suction Pressure A Input

The Suction Pressure Transducer (0-5 VDC input) is used to measure the

suction pressure at the HVAC Unit’s DX evaporator coil suction line. This

suction line pressure is converted to saturated refrigerant temperature by

the SA E-BUS Controller. This temperature is used by the SA E-BUS

Controller to accurately control the compressor’s cycle to provide opti-

mum performance from the system during Dehumidiﬁ cation operation.

AI4 - Suction Pressure B Input

The Suction Pressure Transducer (0-5 VDC input) is used to measure

the suction pressure at the HVAC Unit’s DX evaporator coil suction

line. This suction line pressure is converted to saturated refrigerant

temperature by the SA E-BUS Controller. This temperature is used

by the SA E-BUS Controller to accurately control the compressor’s

components to provide optimum performance from the system during

Dehumidiﬁ cation operation.

AO1 - Modulating Heating Signal

This output signal can be conﬁ gured for either a 0-10 VDC or 2-10

VDC output signal. This signal can be conﬁ gured for either Direct Act-

ing or Reverse Acting operation. This output signal is used to operate

a AAON

Modulating Heating Device to maintain the Heating Supply

Air Temperature Setpoint.

AO2 - Modulating Cooling Stage 1 Signal

This output is used to control either a Copeland Digital Scroll Com-

pressor

™

or a Modulating Chilled Water Valve to maintain the Cooling

Supply Air Temperature Setpoint. If used for a Copeland Digital Scroll

Compressor, the output is conﬁ gured for a 1.5-5.0 VDC operation. If

used for a Modulating Chilled Water Valve, the output is conﬁ gured

for either 0-10 VDC or 2-10 VDC operation and can be conﬁ gured for

direct acting or reverse acting operation.

AO3 - Modulating Cooling Stage 2 Signal

This output signal must be conﬁ gured for a 1.5-5.0 VDC output signal.

This output signal is used to operate a Copeland Digital Scroll

™

Compres-

sor to maintain the Cooling Supply Air Temperature Setpoint.

AO4 - Water Side Economizer Bypass Actuator

Valve A

This output signal is a Direct Acting 2-10 VDC output signal that is used

to modulate the Water Side Economizer Bypass Actuator on a Single

SA Unit or Unit A of a Dual SA Unit.

AO5 - Water Side Economizer Bypass Actuator

Valve B

This output signal is a Direct Acting 2-10 VDC output signal that is

used to modulate the Water Side Economizer Bypass Actuator of Unit

B of a Dual SA Unit.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 73 74

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