Energy Recovery Set-up
(See page 101 for more information)
The Energy Recovery Set-up menu contains parameters that
relate to or are used to control the enthalpy wheel and exhaust
fan when a unit is equipped with an optional energy recovery
wheel system.
Table 34: Energy Recovery
Energy Rvcy is an adjustable item which turns the optional
energy recovery system on /off.
ER Wheel is a status only item used to indicate whether the
energy recovery wheel is currently on or off.
Wheel Speed is a status only item that indicates the energy
wheel variable speed supply air fan speed.
Wheel Spd Cmd is a status only item that indicates the current
energy wheel variable speed supply air fan commanded speed.
ER LAT is status only item which displays the current
discharge air temperature leaving the optional energy recovery
wheel.
ER EAT is status only item which displays the current exhaust
air temperature leaving the optional energy recovery wheel.
Min Exh T Diff is an adjustable item that sets a differential
below the calculated potential energy recovery exhaust air
frosting point. When the ER Exh T falls below the calculated
frosting point by more that this value, the energy wheel will be
driven to its minimum speed, or turned off, to prevent frosting.
Max Exh T Diff is an adjustable item that sets a differential
above the calculated potential energy recovery exhaust air
frosting point. Once the wheel is driven to minimum speed,
or turned off, to prevent frosting, it is driven back to maximum
speed, or turned on, only when ER Exh T rises back above the
calculated frosting point by more that this value.
ER Whl Stg Tm is an adjustable item used to set a minimum
time period for operating at either the minimum or maximum
speed before action is taken to change speed during the frost
protect mode of operation.
ER Whl Off Tm is an adjustable item used to set the minimum
amount of time the energy wheel will remain off after being
turned off due to a frosting/condensation condition.
Rel Humidity is a status only item that indicates the current
relative humidity reading of the sensor.
Min Whl Spd is an adjustable item used to set the energy
recovery minimum wheel speed.
Intersect Pt is a status only item used to indicate the current
intersection point value from the psychometric chart where
potential for wheel frosting exists.
Fst Mgmt Meth is an adjustable item used to select the frost
protection method to be used on a constant speed energy
wheel application.
OA Fst Temp is an adjustable item used to set the outside air
frost temperature.
Defrost Time is an adjustable item used to set the duration of
a defrost cycle.
Defrst Period is an adjustable item used to set how often a
defrost cycle will be initiated.
Defrst On Tm is an adjustable item used to select how long
the constant speed energy wheel is energized during defrost.
Defrst Off Tm is an adjustable item used to select how long
the constant speed energy wheel is de-energized during
defrost.
ER Whl Period an adjustable item which sets the “sampling
time” used in the PI control function.
ER Whl Gain is an adjustable item which sets the “Gain” used
in the PI control function.
ER Whl PAT is an adjustable item which sets the “project
ahead time” used in the PI control function.
ER Max Chg is an adjustable item that sets the maximum
value for an increase or decrease of the energy recovery wheel
speed.
Item Display
Name
Default
Setting
Range
Password
Level
Energy Rvcy= Yes Yes, No 4
ER Wheel= — On, Off 4
Wheel Speed= — 0–100% 4
Whl Spd Cmd= — 0–100% 4
ER LAT= — -50.0–200.0°F 4
ER EAT= — –50.0–200.0°F 4
Min ExhT Diff= 2.0°F 1.0–20.0°F 4
Max ExhT Diff= 6.0°F 1.0–20.0°F 4
ER Whl Stg Tm= 5min 1–100min 4
ER Whl Off Tm= 20min 1–100min 4
Rel Humidity= — 0–100% 4
Min Whl Spd 5% 0–100% 4
Intersect Pt= — -146.2.0–150.0°F 2
Fst Mgmt Meth= Timed Timed ExhAir 4
OA Fst Temp= -20.56°C -40.0 – 37.78°C 4
Defrost Time= 5min 0–60min 4
Defrst Period= 60min 0–1440min 4
Defrst On Tm= 1s 0–999s 2
Defrst Off Tm= 24s 0–999s 2
ER Whl Period= 30.0s 0–999.0s 2
ER Whl Gain= 1.0 0–100 2
ER Whl PAT= 30.0s 0–999.0s 2
ER Max Chg= 10% 0–100% 2
coMMIssIon unIt
www.DaikinApplied.com 57 OM 1141-3 • MICROTECH UNIT CONTROLLER
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