Installation manual

IM-487 Page 13
Controls, Settings, and Functions
Table 2: Controls, settings and functions
SYMBOL DESCRIPTION FUNCTION RESET LOCATION SETTING RANGE DIFFERENTIAL PART NO.
DAT Discharge air
temperature sensor
Senses discharge air
temperature.
N/A Discharge air
section
N/A 3K ohms at
77°F (25°C)
N/A 060004705
DHL Duct high limit
switch
Prevents excessive VAV duct
pressures; shuts off fan.
Auto Main control
panel
3.5” w.c (871.8 Pa) 0.05-5.0” w.c.
(12.5-1245.4 Pa)
.05" w.c.
(12.5 Pa), fixed
065493801
EFT Entering fan air
temperature sensor
Senses entering fan air
temperature
N/A Inlet of supply
fan
N/A 3K ohms
at 77°F (25°C)
N/A 060004705
FS1 Freezestat Shuts off fans, opens heating
valve and closes outdoor
damper if low air temperature
at coil is detected.
Auto Heating
section
38°F (3°C)
or as required
35°F - 45°F
(2°C - 7°C)
12°F (7°C), fixed 065830001
OAE Enthalpy control
(electromechanical)
Returns outside air dampers
to minimum position when
enthalpy is too high.
Auto Economizer
section
"B" or as required A — D Temperature:
3.5°F (2°C)
Humidity:
5% fixed
030706702
Enthalpy control
(electronic)
Returns outside air dampers
to minimum position when
outside air enthalpy is higher
than return air empalthy
(use RAE)
Auto Economizer
section
Fully CW past "D"
(when used
with RAE)
A — D N/A 049262201
OAT Outside air
temperature sensor
Senses outside air
temperature.
N/A N/A 3K ohms at
77°F (25°C)
N/A 060004705
PC5 Dirty Filter switch Senses filter pressure drop. Auto First Filter
section
As required .05-5” w.c.
(12.5-1245.4 Pa)
.05” w.c.
(12.5 Pa)
065493801
PC6 Dirty Filter switch Senses filter pressure drop. Auto Final Filter
section
As required .05-5” w.c.
(12.5-1245.4 Pa)
.05” w.c.
(12.5 Pa)
065493801
PC7 Air flow proving
switch
Senses supply fan pressure
to prove airflow.
Auto Supply fan
section
.10" w.c. (25 Pa) .05-5” w.c.
(12.5-1245.4 Pa)
.05” w.c.
(12.5 Pa), fixed
060015801
RAE Return air enthalpy
sensor
Used to compare return air
enthalpy to outside air
enthalpy (used with OAE).
N/A Economizer
section
N/A N/A N/A 049262202
RAT Return air
temperature sensor
Senses return air
temperature.
N/A Return air
section
N/A 3K ohms at
77°F (25°C)
N/A 060004705
SD1 Smoke detector,
supply air
Initiates unit shutdown if
smoke is detected.
Manual Discharge air
section
N/A N/A N/A 04925001
SD2 Smoke detector,
return air
Initiates unit shutdown if
smoke is detected.
Manual Return air
section
N/A N/A N/A 04925001
SPS1 Static Pressure
Sensor Duct # 1
Converts static pressure
signals to voltage signals.
N/A Main control
box
N/A 0—5” w.c.
(0—1245.4 Pa)
1—6 VDC out
N/A 049545005
SPS2 Static Pressure
Sensor Duct # 2
Converts static pressure
signals to voltage signals and
sends them to MicroTech II
controller.
N/A Main control
box
N/A 0—5” w.c.
(0—1245.4 Pa)
1—6 VDC out
N/A 049545005
Static Pressure
Sensor: Building
(Space) Pressure
Converts static pressure
signals to voltage signals.
N/A Main control
box
N/A -025—0.25” w.c.
(-62.3—62.3 Pa)
1—5 VDC out
N/A 049545006
S1 System Switch Shuts off entire control circuit
(except crankcase heaters)
N/A Main control
box
N/A N/A N/A 001355000
S7 ON-OFF-AUTO
switch
Used to manually switch unit. N/A Main control
box
N/A N/A N/A