Energy Recovery - McQuay MicroTech III RAH Operation And Maintenance Manual

McQuay OM 920-1
DAT Htg Spt is an adjustable parameter which sets the heating discharge set point.
Htg Reset is an adjustable item used to set the type of heating reset to be used.
Min Htg Spt is an adjustable item which sets the minimum heating discharge set point for use
with a heating discharge air temperature set point reset schedule.
Min Htg Spt @ is an adjustable item which sets the value of the sensor input, selected with
the heating reset parameter, at which the heating setpoint is reset to the Min Htg Spt value.
Max Htg Spt is an adjustable item which sets the maximum heating discharge set point for
use with a heating discharge air temperature set point reset schedule.
Max Htg Spt @ is an adjustable item which sets the value of the sensor input, selected with
the heating reset parameter, at which the heating setpoint is reset to the Max Htg Spt value.
Min DAT Ctrl is an adjustable item used to activate or deactivate the low discharge
temperature limit function available on units equipped with modulating or multistage heat.
Min DAT Limit is a status only item which indicates the discharge air low limit temperature
on CAV zone control units. Heating will be activated to maintain this setting when the
discharge temperature falls below it during the Fan Only operating state. On VAV or CAV
discharge control units, the minimum discharge temperature limit is the DAT Clg Spt.
Occ Heating is an adjustable item which enables and disables the "daytime" heating mode of
operation. If the Occ Heating parameter is set to No, the unit will only go into heating during
the initial morning warm-up cycle. If the Occ Heating parameter is set to Yes, the unit can go
into the heating mode of operation any time during the day.

Energy Recovery

The Energy Recovery 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 16: Energy Recovery
Menu Display Name Item Display Name
Energy Recovery Energy Rec=
Wheel Speed=
Whl Spd Cmd=
ER DAT=
ER ExhT=
Min ExhT Diff=
Max ExhT Diff=
Stage Time=
Min Off Time=
Rel Humidity=
Min Whl Spd=
Energy Rvcy is an adjustable item which turns the optional energy recovery system on /off.
Wheel Speed a status only item that indicates the energy wheel VFD speed.
Wheel Spd Cmd is a status only item that indicates the current energy wheel VFD
commanded speed.
ER DAT is status only item which displays the current discharge air temperature leaving the
optional energy recovery wheel.
ER Exh T is status only item which displays the current exhaust air temperature leaving the
optional energy recovery wheel. Note: This sensor is present only when the unit is equipped
with the energy recovery wheel frost protection option
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
Keypad/Display Menu Structure
Default Setting
Yes
-
-
- -50.0-200.0°F
- -50.0-200.0°F
2.0°F
6.0°F
5min
20min
-
33%
Range Password Level
No 6
Yes
0-100% 6
0-100% 6
6
6
1.0-10.0°F 6
1.0-10.0°F 6
1-100min 6
1-100min 6
0-100% 6
0-100% 6
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