Miscellaneous Service Parameters - McQuay MicroTech II Operation Manual

Miscellaneous Service Parameters

Table 25: Programmable Parameters
Keypad/Display ID
Menu Name Item Name
EFT Sensor= No
2nd P Sensor= None
RF/EF Ctrl= Tracking
Unit Configuration
Rem RF/EF Cap=
Eng Units= English
The Unit Configuration menu contains several miscella-
neous control parameters as listed in the table above. These
parameters are generally the type that are set at the factory
and might be adjusted when the equipment is started up and
generally do not required further adjustment. The following
sections describe these parameters.
EFT Sensor
When a unit is equipped with gas or electric heat, it is
equipped with an entering fan temperature (EFT) sensor.
This sensor senses the temperature of the air entering the dis-
charge air fan and is compared to the unit discharge air tem-
perature to obtain an indication of the temperature rise across
the gas or electric heat section. The controller uses this infor-
mation to assure the heat rise across the heater does not
exceed the safe limit for the heat exchanger. When the enter-
ing fan temperature sensor is installed the Entering Fan Sen-
sor Present Flag is set to "Yes." When the entering fan
temperature sensor is not installed the Entering Fan Sensor
Present Flag is set to "No." Setting this parameter to "No"
disables the alarm function associated with an open circuit at
the EFT temperature sensor input.
2nd P Sensor
The Second Pressure Sensor Present Flag is used to indicate
whether or not an optional building static pressure sensor is
installed in the "second sensor" input location.
Note: When the unit is equipped for zone (or space com-
fort) control, the "second sensor" input location is
OM 138
Parameter Name
Entering Fan Sensor
Present Flag
Second Pressure
Sensor Present Flag
Return/Exhaust Fan
Capacity Control
Flag
Remote
Return/Exhaust Fan
25%
Capacity Set Point
Engineering Units
Control Flag
design only for a building static pressure input.
There is no "first sensor" location.
The Second Pressure Sensor Present Flag should be set to
"None" when the Return/Exhaust Fan Capacity Control Flag
is set to "None" or "Position". When the Return/Exhaust Fan
Capacity Control Flag is set to "Bldg", the Second Pressure
Sensor Present Flag automatically reverts to "Bldg". For
detailed information regarding return fan capacity control,
refer to "Return Fan Capacity Control" on page 88.
RF/EF Ctrl
The Return/Exhaust Fan Capacity Control Flag is used to
select the type of return or exhaust fan capacity control, if
any, to be used. When the unit is not equipped with return
fan vanes or a VFD, the Return/Exhaust Fan Capacity Con-
trol Flag should be set to "None". When the unit is equipped
with return fan vanes or a VFD, the Return/Exhaust Fan
Capacity Control Flag can either be set to "Bldg" or "Posi-
tion".When the Return/Exhaust Fan Capacity Control Flag is
set to "Bldg", the return or exhaust fan capacity is controlled
to maintain the building static pressure at a building static
pressure set point. When the Return/Exhaust Fan Capacity
Control Flag is set to "Position", then the return or exhaust
fan capacity is controlled to the Remote Return/Exhaust Fan
Capacity Set Point. For detailed information regarding return
or exhaust fan capacity control, refer to"Return Fan Capacity
Control" on page 88 or "Energy Recovery" on page 86.
Rem RF/EF Cap
The the return or exhaust fan capacity is controlled to main-
tain the Remote Return/Exhaust Fan Capacity Set Point
when the Return/Exhaust Fan Capacity Control Flag is set to
"Position". The Remote Return/Exhaust Fan Capacity Set
Point is normally adjusted via a network signal but can also
be adjusted via the keypad/display in the absence of a net-
work connection to the parameter. For detailed information
regarding return or exhaust fan capacity control, refer
to"Return Fan Capacity Control" on page 88 or "Energy
Recovery" on page 86.
Eng Units
The Engineering Units Control Flag is used to select the sys-
tem of engineering units used for displaying data on the key-
pad. If this parameter is set to "English", the keypad data is
displayed in inch-pound (I-P) units. If this parameter is set to
"SI Canada", the keypad data is displayed in the Interna-
tional System of Units (SI) used in Canada. If this parameter
is set to "SI Europe", the keypad data is displayed in the
International System of Units (SI) used in Europe.
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