Greenheck ERH Installation Manual

Part # 461468

®

Models ERH, ERCH, and ERT

Installation, Operation, and Maintenance Manual

CAREL

pCO2 built-in terminal

WARNING

Disconnect and secure all electrical power to the “OFF” position on the unit prior to inspection or servicing.

Failure to comply with this safety precaution could result in serious injury or death.

Temperature Control Package

Table of Contents

Temperature Control Package Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Sensor Locations...........................................................................2

Sequence of Operation - Summer .............................................................2

Sequence of Operation - Winter ............................................................... 2

Navigating the Controller ....................................................................3

Programming Loops ........................................................................3

Getting Started ............................................................................3

Status Loop ............................................................................... 3

Set Point Loop............................................................................. 4

Time and Holiday Loop ......................................................................5

Unit Set-Up Loop......................................................................... 5-6

Options ..................................................................................7

Controller Wiring ...........................................................................7

Remote Interface Panel......................................................................8

Troubleshooting ...........................................................................8

Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one
year from the shipment date. The energy recovery wheel is warranted to be free from defects in material
and workmanship for a period of five years from the shipment date. Any units or parts which prove to be
defective during the warranty period will be repaired or replaced at our option when returned to our factory,
transportation prepaid.

Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by
Greenheck prove defective during this period, they should be returned to the nearest authorized motor
service station. Greenheck will not be responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.

Temperature Control Package Description

The Temperature Control Package enables models ERH, ERCH, or ERT to temper outdoor air to desired
temperature and relative humidity. The controller and accompanying sensors are mounted in the unit, wired,
and fully programmed at the factory. Default settings are pre-programmed, but are field adjustable. This unit
has been programmed for either discharge or room control. Discharge control will temper the outdoor air to the
desired discharge condition. Room control will temper the outdoor air to meet the desired room air conditions
with the use of a remote thermostat. An optional humidistat is available for tighter control of room humidity
conditions.

Sensor locations

Outdoor air sensor

1

(summer/winter changeover)

After-wheel temperature sensor

2

(energy savings readout, coil freeze protection)

After-coil cooling temperature sensor (on units

1 432

3

with cooling)

4

Discharge temperature sensor

Summer Sequence of Operation

1. Outdoor air sensor detects high enthalpy and
activates summer operation mode.

2. The energy wheel cools and dehumidifies the
outdoor air.

No Room Thermostat or Humidistat

3a. After-coil temperature sensor sends signal to

controller to regulate condensing unit stages or
chilled water valve. DX or chilled water will cool air
to the specified after-coil set point.

3b. Sensor detects discharge air temperature (for

reheat). Controller adjusts hot water valve, electric
heat, or indirect fired furnace stages to meet the
summer heat setting.

Room Thermostat only

3a. When the room temperature set point is met, the

DX or chilled water coil will cool air to the specified
after-coil set point. If the unit is equipped with
reheat, the air will be reheated to the specified
summer heat setting.

3b. When the room temperature is above the summer

set point, the after-coil temperature will drop to
the specified after-coil override setting and the
discharge temperature will drop to the summer
heat override setting (i.e. turn the heater off) .

4

1

3

Room Humidistat only

3a. When the humidity set point is satisfied, the DX or

chilled water coil will cool air to the specified after­coil set point. If the unit is equipped with reheat,
the air will be reheated to the specified summer
heat setting.

3b. When the humidity in the space is too high, the DX

or chilled water coil will drop to the specified after­coil override setting with no change in reheat.

Room Thermostat and Humidistat

3a. When the room temperature and humidity set

points are satisfied, the DX or chilled water coil
will cool air to the specified after-coil set point.
If the unit is equipped with reheat, the air will be
reheated to the specified summer heat setting.

3b. If the temperature is met, but the humidity is high,

the after-coil temperature will drop to the specified
after-coil override setting with no change in reheat.

3c. If the temperature is high (regardless of the

humidity conditions in the space), the after-coil
temperature will drop to the specified after-coil
setting and the discharge temperature will drop
to the summer heat override setting (i.e. turn the
heater off).

Winter Sequence of Operation

1. Sensor detects that the outdoor air enthalpy
has fallen below the summer/winter changeover
enthalpy and activates winter operation mode
which disables the unit’s cooling capabilities.

2. The energy wheel heats and humidifies the
outdoor air.

No Room Thermostat

3. Discharge air sensor senses temperature.
Controller adjusts hot water valve, IG furnace, or
electric heat stages to the winter heat setting.

2

1

4

With Thermostat

3a. When room temperature set point is met, the unit

will discharge air at the winter heat setting.

3b. When room temperature is below the set point, the

unit will discharge air at the heat override setting.

Navigating the Controller

Alarm indicator for water coil freeze protection

Access Set Point loop (See page 4)

Return to the Status screens (See page 3)

Used to scroll through the screens and
change set points.

Used to enter a screen to change set points and
advance to the next set point

Access Unit Set-Up Loop (See pages 5-6)

Access Time and Holiday Loop (See page 5)

Getting Started

Figure 1: Start-up screen

Greenheck Fan Corp.

Version: 2.xx

Temperature Control

Cooling setting: 0

Table 1: Cooling settings

Cooling Method Cooling Setting

0 Chilled Water

1 1-stage DX

2 2-stage DX

CAREL

pCO2 built-in terminal

Figure 1 shows the screen that appears when power is initially
supplied to the controller. It lists the program version and the cooling
setting.

The cooling settings are as shown in Table 1. Compare the settings
on the screen with the options on the unit. Jumpers control all
the settings on the first screen. If there is a discrepancy between
what was ordered and the first screen, compare the wiring on the
controller to the wiring diagram on page 7 or on the unit’s control
center door and adjust accordingly.

To allow the fans and energy wheel in the unit to operate, wire a
switch or jumper between terminals 2 and 3 in the unit’s control
center.

Programming Loops

Several programming loops may be accessed to
change settings on the controller. Navigation through
the loops remains the same throughout the program.

1. To scroll through the screens, use the and

keys.

2. To enter a screen to change a set point, press .

3. Use and to change the set points.

Status Loop

The Status Loop monitors the following conditions:

1) Date and Time

2) System set points

3) Outdoor air conditions

4) Tempering status

5) Energy savings calculation

To enter the Status Loop, press .

4. Press

to advance to the next set point on the

screen.

5. When the set points have been changed, press
until a solid box appears in the upper left corner
of the screen. You may then resume scrolling
through the screens.

Time 00:00
Date: 00/00/00

Sunday

Status
After Wheel: 00.0F
After Coil: 00.0F
Disch Temp: 000.0F

Outdoor Air
Temp: 00.0F
RH: 00.0%
Enthalpy: 00.0B/lb

Tempering Status
Heat (%): 000
Cool Stage 1: Off
Cool Stage 2: Off

Energy Savings

00.0 Tons

3

Set Point Loop

All temperature settings may be accessed in the set point loop; default temperature settings are shown on the
left. To access the Set Point Loop, press .

Heat Settings
Summer 60.0F
Winter 70.0F

Heat Override
Summer 45.0F
Winter 95.0F

After Coil Setting
Typical 55.0F
Override 45.0F

Heat Settings

No Room Thermostat

If reheat in the summer is required, adjust the summer heat setting to the desired
discharge temperature. If no reheat is required, set the summer temperature
below the after-coil setting. Adjust the winter set point to the desired discharge
temperature.

With Room Thermostat

The winter heat setting is the temperature the unit will discharge when the
thermostat is satisfied.

Heat Override

Only applicable on units with Room Thermostat

The summer set point is the temperature the unit will discharge when the
thermostat is calling for cooling in the summer. The winter set point is the
temperature the unit will discharge when the unit is calling for heat in the winter.

After-Coil Setting

No Room Thermostat or Humidistat

The typical setting is the desired temperature leaving the cooling coil. The
override setting is not applicable when no thermostat or humidistat is hooked to
the controller.

With Room Thermostat and/or Humidistat

The typical setting is the temperature after the cooling coil when the thermostat
is satisfied. The Override is the after-coil temperature when the room is above the
summer thermostat setting or when the room humidity is higher than the humidity
set point.

Operating Set Points
Change Enth 21.0B/lb
Freeze 35.0F

Economizer
Set 21.0 B/lb
Band 3.0 B/lb

Mode

Unit: Auto

Ret to Fact Defaults

Off

Operating Set Points

Change Enth

Change Enth is the enthalpy at which the controller will switch from summer to
winter operation. This set point has a factory programmed 0.5 btu/lbm dead­band built-in to prevent the unit from rapidly switching from summer to winter
operation.

Freeze (Visible with Chilled Water Coil only)

The controller protects chilled water coils from freezing. When conditions before
the coil fall below the field-adjustable set point, the controller opens the water
valves completely, shuts down the supply fan and energy wheel, and sounds an
alarm on the controller in the unit. The controller also outputs a 10 VDC signal that
may be monitored remotely.

Economizer (Visible with Internal Economizer only)

“Set” is the enthalpy at which the energy wheel will be de-energized for “free
cooling” conditions.

“Band” is the range above and below the set point that the wheel will be de­energized. (i.e. For the default setting, the wheel will be de-energized between 18
and 24 Btu/lb.)

Mode

“Auto” allows all features to operate as programmed on the controller.
“On” overrides the functionality of the controller (i.e. the supply blower, exhaust
blower and the energy wheel will always be energized).

Ret to Fact Defaults

“On” returns all settings to the original factory settings. Once “On” is selected and
is pressed, the display resets to the “Off” selection.

WARNING! When Return to Factory Defaults is turned to “On”, the blowers,

4

energy wheel and tempering options will be energized.

Time and Holiday Loop

To set the days and times the unit will be operating, access the Time and Holiday Loop by depressing and

simultaneously. Default operation is 24 hours a day, 7 days a week.

Set Time and Date

Time: 00:00
Date: 00/00/00

Operation Hours
24hr Operation: Y
Unit On Time: 07:00
Unit Off Time: 18:00

Operation Days
SUN: Y MON: Y TUE:Y
WED: Y THU: Y
FRI: Y SAT: Y

Holiday Operation
New Years Day: Y
Memorial Day: Y
4th of July: Y

Labor Day: Y
Thanksgiving: Y
Christmas Eve: Y
Christmas Day: Y

Set Time and Date

Set the current time and date. The controller does not adjust for daylight
savings time.

Operation Hours

24 Hour Operation: Set to “Y” if the unit will be operating 24 hours per
day. Set to “N” if the unit will not be. If “N” is selected, set the Unit On
Time and Unit Off time to the time of day the unit will be turning on and off,
respectively. All time settings are in military time.

Operation Days

For each day of the week, set to “Y” if the unit will be running, “N” if it will not.

Holiday Operation

Several holidays are listed. Set to “Y” if the unit will be in operation on those
days, “N” if it will not.

User Holiday: Y
Start: 00/00 MO/DAY
End: 00/00 MO/DAY

Unit Set-Up Loop

Summer Settings
SCFM: 00000
Ret Air Temp: 75.0ºF
Ret Air RH: 0.0%

Winter Settings
SCFM: 00000
Ret Air Temp: 70.0ºF
Ret Air RH: 0.0%

Heat Parameters
Band: 10.0ºF
Integration: 005S
Stage Delay: 05S

(Cont’d on
next page)

User Holiday

One User Holiday may be entered. If “N” is selected, set the day and month
the unit will cease operation and the day and month it will start up again.

Summer / Winter Settings

The controller is programmed to calculate the real-time energy savings
achieved by the use of the energy wheel in tons. The savings may be read
at the controller, or it may be field-wired (see Controller Wiring on page 7)
to track remotely by an analog output from the controller. 0-10 VDC output
corresponds to 0-50 tons of energy savings. To initialize the energy savings
analysis, set the outdoor air SCFM, as well as the return air temperature and
relative humidity. Set these values for both summer and winter.

Heat Parameters

Band The band is the dead-band around the heating set points. The

smaller the band setting, the more sensitive the controller will
be to small temperature changes.

Integration The integration setting (in seconds) is the time necessary for

the integer value to be doubled (i.e. increasing the time setting
decreases the response time).

Stage Delay The stage delay is the minimum time between activation of

stages for electric heat or 2-stage IG furnaces. The default
setting for electric heat is 5 seconds and 60 seconds for IG
furnaces.

5

Unit Set-Up Loop (cont’d)

IG Furnace Settings

Min Time On: 2 MIN

IG Furnace Settings (Visible with Indirect Fired Gas Furnace only)

Min Time On The minimum time the furnace stages on.

Cool Parameters
Band: 10.0F
Int: 005S
Time Off: 300S

DX Rotation
Btwn Stages: 060S
Btwn Starts: 300S

Cool Parameters

Band The dead-band around the cooling set points. The smaller the

band setting, the more sensitive the controller will be to small
temperature changes.

Integration The integration setting (in seconds) is the time necessary for

the integer value to be doubled (i.e. increasing the time setting
decreases the response time).

Time Off For DX cooling only. The delay (in seconds) before an “On”

signal is sent to the compressor upon initial power being
supplied to the controller. This feature provides a safety delay
for the compressors to prevent short-cycling during power
interruption to the controller. This delay will be in addition to
any time delays built into the compressor.

DX Rotation (2-stage condensers only)

To avoid short-cycling the condensing unit, a time delay between stages and
a time delay between starts may be set. The condensing unit may also have
delays built-in, so ensure compatibility between the times set in the controller
and condenser.

Btwn Stages Minimum time which must elapse between different

compressors turning on.

Btwn Starts Minimum time which must elapse between a compressor

turning off and turning on again.

The controller has stage auto-rotation programmed into it to equalize the
run time between the stages. On a call for cooling, the first stage will be
activated. If, after the time delay, the cooling load is not met, the second
stage will start. When the cooling load is satisfied, the first stage will turn off
and the second stage will continue to run.

Internal Economizer

Inactive

6

Internal Economizer

Select between Inactive and Active. Internal economizer is recommended
when the energy recovery unit provides 100% of the outdoor air. During
economizer mode, the energy wheel is de-activated to enable “free-cooling”.
Refer to page 4 to set the enthalpy at which economizer mode will be
activated.
The controller also has external economizer capabilities. External economizer
is recommended when the energy recovery unit is used in conjunction with
an air-handling unit that has its own economizer section. When the energy
recovery unit gets the economizer signal from the air handler, the supply
blower, outdoor damper, and energy recovery wheel are de-energized. Refer
to the wiring diagram on page 7 for wiring the external economizer contact
into the controller.

Options

Thermostat (Supplied by GREENHECK or others)

A summer and winter thermostat are required for use with this controller. The thermostat contacts must close on
a call for cooling in the summer and heating in the winter.

Humidistat (Supplied by GREENHECK or others)

The humidistat must close on the call for dehumidification.

Water Valves (Supplied by GREENHECK)

Water valves must be Normally Closed and use a 0-10 VDC control input.

Night Setback (Switch supplied by GREENHECK or others)

If a recirculation damper is provided on the unit, a remote switch or timer may be wired into the controller to put
the unit in night setback operation. Night setback will close the outdoor air and discharge damper, shut off the
energy wheel and exhaust blower, and open the recirculation damper to recirculate air during unoccupied mode.

Controller Wiring

T1A Discharge Temp Sensor

Legend

T2A After Coil Temp Sensor

T4A Supply Inlet Enthalpy Sensor

T5A After Wheel Temp Sensor

SW1 External Economizer Switch

SW2 Night Setback Switch

SW1 Unit on/off Switch

TS10 Winter Thermostat (Closes on

call for additional heat)

TS11 Summer Thermostat (Closes on

call for additional cooling)

JS1 Room Dehumidistat (Closes on

a call for dehumidification)

MULTI-VOLTA GE PRIMARY
24 SECONDARY

TS11

TS10
HS1

SW1

SW2

IG HEAT

1 STAGE DX (EN)

2 STAGE DX (EJ)

H4

X1

T1A
T2A

T5A

NTC

M

NTC

G+

TH

T4A

TR1

H3

H1

H2

G

GND

B1
B2

B5

BC4
B4

B3

ID1
ID2

ID3
ID4

ID5

ID6
ID7
ID8

C1
C4
C7
C8

X2

VG

VGOGO

IDC1

NO1
NO2
NO3
NO4
NO5

Y1

Y2

DGH CONTROLLER

Y3

Y4

NO8

NO6
NO7

16
17
18
19
20

H1
H2
H3

DX1

DX2

HWC

CWC

AFA

AES

1

DGH CONTROLLER

HEAT STAGE #1
HEAT STAGE #2
ELEC. HEAT STAGE #3
CONDENSOR STAGE #1
CONDENSOR STAGE #2

(CONDENSOR BY OTHERS)

HOT WATER/STEAM VALVE
(BY OTHERS OR GFC)

CHILLED WATER VALVE
(BY OTHERS OR GFC)

ANALOG FREEZE ALARM

(BY OTHERS)

ANALOG ENERGY SAVINGS
0-50 TONS (BY OTHERS)

S1

2

S1

3333

ENERGY WHEEL

15

SUPPLY FAN

14

EXHAUST FAN

1313

Note: When no jumpers or both jumpers are wired into ID7 and ID8, the unit is setup for chilled water control.

7

Remote Interface Panel

on/off alarm enter

If a Remote Interface Panel is ordered, it may be mounted in the
desired location in the building and connected to the controller in
the energy recovery unit by a telephone cable. The controller may
then be monitored and programmed from that location.

The face of the panel contains five buttons, but the face of the
panel may be flipped down to reveal more buttons.

Turns the unit on and off

Signals that the unit is in freeze protection mode

on/off alarm enter

Used to scroll through the screens and change
set points

Used to enter a screen to change set points and advance to the next set point

prog.

Used to access the Set Point loop (under the face of the panel)

set

Return to the Status Screen (under the face of the panel)

Used to access the Time and Holiday Loop

set

prog.

Used to access the Unit Set-Up Loop

Troubleshooting for Temperature Controller

Symptom Possible Cause Corrective Action

Unit not running Unit is in unoccupied mode Ensure date, time, and operational days are

set correctly.

Supply blower not running External economizer functioning

Freeze protection functioning

Exhaust blower not running Unit is in night setback mode Check field mounted night setback switch or

Energy wheel not running External economizer functioning

Internal economizer functioning

Freeze protection functioning

Unit is in night setback mode

Ensure economizer setting is correct.

Check for freeze alarm on the controller.
Check freeze protection set point.

timer for correct settings.

Ensure economizer mode setting is correct.

Check set point for internal economizer.

Check for alarm on the controller and the
freeze protection set point.

Check field mounted night setback switch or
timer for correct settings.

IOM Temperature Control Pkg.

Rev. 1 November 2001

Copyright © 2001 Greenheck Fan Corp.