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Carrier
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AC350
Carrier AC350 User Manual
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T
-304
5-
-
10
04/08
j.
T
he
superheat
ma
y
cycle
from
a
lo
w
t
o
high
reading.
Monit
or
t
he
s
uperheat
t
aking
r
eadings
ev
ery
3-
-
5
min-
utes
f
or
a
t
otal
of
5
-
-
6
readings.
Calc
ulate
the
super
-
heats
,
add
t
he
readings
and
div
ide
by
t
he
number
of
readings
t
aken
t
o
deter
mine
aver
age
superheat
.
T
he
superheat
s
hould
be
18
±
3
°
F.
k.
If
super
heat
is
not
within
t
oleranc
e,
r
eplace
t
he
valv
e.
40
42
Table of Contents
Default Chapter
2
Air Conditioning Unit
2
Table of Contents
3
Paragraph Number
7
Safety Summary
7
Safety--1
7
Description
9
Introduction
9
Table 1--1 AC310 Models
9
Table 1--2 AC 350 Models
9
Table 1--3 Additional Support Manuals
9
General Description
10
Rooftop Unit
10
Condensing Section
10
Figure 1--1 AC310/350 Rooftop Units
10
Evaporator Section
12
Drivers Evaporator (Optional)
14
Compressor Assembly
14
System Operating Controls and Components
15
280P & 282P (PWM) Electronic Thermostat Controller
15
CSDD BT--324 (Carrier--Sutrak Digital Display) Microprocessor
15
Motor Fault Board (Optional)
15
Refrigeration System Component Specifications
15
Electrical Specifications -- Motors
15
Safety Devices
16
Air Conditioning Refrigeration Cycle
16
Heating Cycle
16
Figure 1--6 Refrigerant Flow Diagram -- Cooling (Dual Loop)
17
Figure 1--8 Refrigerant Flow Diagram, Cooling (Single Loop) AC350
19
Figure 1--9 Sheet 1 -- Electrical Control Board (280P)
20
Figure 1--9 Sheet 2 Legend
21
Figure 1--10 AC350 with BT324 Control
22
Figure 1--11 Motor Fault Board (Optional)
23
OPERATION (Manual Controller)
24
Starting, Stopping and Operating Instructions
24
Starting
24
Stopping
24
Pre--Trip Inspection
24
Figure 2.1 Control Switches (Typical)
24
Modes of Operation
25
Temperature Control
25
Cooling Mode
25
Heating Mode
25
Boost Pump (Optional)
25
Vent Mode
25
Compressor Unloader Control (Only with 05G or 05K Compressors)
25
Override Mode -- AC310 (Dehumidification)
25
Table 2--1 Unloader UV1 Relay
25
Table 2--2 Unloader UV2 Relay
25
Evaporator Fan Speed Selection
26
Compressor Clutch Control
26
(A--6, Tm--16, Tm--21)
26
Sequence of Operation (280P / 282P)
26
Electronic Thermostat
26
Figure 2.2 280P / 282P Thermostat
26
OPERATION BT324 Controller
27
Starting, Stopping and Operating Instructions
27
Starting
27
Stopping
27
Pre--Trip Inspection
27
Figure 3--1 Bus Dash with A/C Switch & BT324 CSDD Controller
27
Sequence of Operation Bt324 Csdd
28
Function of Keys When "Engine On" and Controller Active
28
Illuminating Indications (Display)
28
Operating Instructions BT324
28
Display
28
Interior Temperature Control
28
Ventilation
28
Figure 3--2 BT324 CSDD Controller
28
Reheat (Optional)
29
Temperature Indication
29
Changing between 5F (Fahrenheit) and 5C (Celcius )
29
Troubleshooting
30
System will Not Cool
30
System Runs but Has Insufficient Cooling
30
Abnormal Pressures
30
Abnormal Noise or Vibrations
30
Table 4--1 General System Troubleshooting Procedures
30
No Evaporator Air Flow or Restricted Air Flow
31
Expansion Valve Malfunction
31
Heating Malfunction
31
Service
32
Maintenance Schedule
32
Removing Evaporator Cover
32
Removing Condenser Cover
32
Installing Manifold Gauge Set
32
Installing R--134A Manifold Gauge/Hose SET
33
Pumping the System down or Removing the Refrigerant Charge
34
System Pump down for Low Side Repair
34
Removing Entire System Charge
34
Refrigerant Leak Check
34
Evacuation and Dehydration
34
General
34
Figure 5--2 In--Line Service Connections
34
Preparation
35
Procedure for Evacuation and Dehydrating System
35
Adding Refrigerant to System
35
Checking Refrigerant Charge
35
Adding Full Charge
35
Checking for Noncondensibles
35
Checking and Replacing High or Lowpressure Cutout Switch
35
Replacing High or Low Pressure Switches
35
Checking High or Low Pressure Switches
36
Filter-Drier
36
To Check Filter--Drier
36
To Replace Filter--Drier Assembly
36
Servicing the Heat Valve
37
Coil Replacement
37
Internal Part Replacement
37
Replace Entire Valve
37
Servicing the Liquid Line Solenoid Valve
37
Coil Replacement
38
Internal Part Replacement
38
Replace Entire Valve
38
Service Valves
38
Replacing Return Air Filters
39
Thermostatic Expansion Valve
39
Valve Replacement
40
Superheat Measurement
40
Table 5--1 R-134A Temperature - Pressure Chart
42
Electrical
43
Introduction
43
4
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Carrier AC350 Specifications
General
Brand
Carrier
Model
AC350
Category
Air Conditioner
Language
English
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