McQuay RoofPak RAH 047C, Руководство по установке и обслуживанию

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McQuay IM 487-4 15
Introduction
Controls, Settings, and Functions
Table 2 below lists all of the unit control devices. Included in
the table are the device symbol, a description of the device, its
function, and any reset information, its location, any device setting, any setting ranges, differentials, and the device part
number.
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 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 N/A 060004705
FP1, 2
Evaporator frost
protection Senses low refrigerant
temperature
N/A
Return bends of
evaporative coil
Opens at 30°F
Closes at
45°F
N/A N/A 072501901
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
MCB Main control board Processes input information N/A Main control box N/A N/A N/A 060006101
OAE
Enthalpy control
(electro-mechanical)
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 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
Airflow 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 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 049545007
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 049545007
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
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