Transcript Product Training 48/50PD Series - digital

Product Training
48/50PD Series
Copyright © Carrier Corp. 2008
Agenda
1.
2.
3.
4.
5.
Overview
Applications
New Components
Start-Up
Resources
Centurion 48/50PD Overview
What is it?
The Centurion 48/50PD product line is a 4 or 5 ton unit with a variable
capacity digital scroll compressor and a variable speed indoor fan.
Product purpose?
• For use with either of the following two specific applications:
 Displacement Ventilation
 Single-Zone Variable Air Volume
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Reduced kW consumption during part-load
Reduced Indoor Sound Levels
Higher Base Unit Efficiencies
Increased Operational $ Savings
Optimum Comfort Control
Ideal for School Market Applications
Thermal Displacement Application
Overview Details
Same chassis as Centurion 48/50PG units: same footprint
and unit dimensions
Same roofcurbs as Centurion 48/50PG units
ComfortLink Controls standard in all 48/50PD units
All the same options & accessories as 48/50PG units
except:
- No EnergyX ERV option
- No Humidi-MiZer Adaptive Dehumidification option
- Requires a space temp sensor; cannot use a thermostat
Single Refrigerant Circuit Machine
Centurion 48/50PD Overview
Ton Range
5 ton
4 ton
1
2
3
4
5
Range
Range
48 / 50 PD
Variable Speed IFM Drive
can vary fan speed from 20% - 100%
Variable Capacity Digital Scroll
15% - 100% of full load
Overview - How it Works
Applications
• Displacement Ventilation (DV)
 Specific specification per job
 Specific Duct and installation (new construction)
 Unique unit software configuration settings
 Dry climate regions
• Single Zone VAV
 Standard duct and installation
 Not approved for multiple zone control
 Not applicable with 3V® Zoning
Displacement Ventilation Application
• Closely related to Underfloor Air
Distribution systems, but with a
rooftop unit and only for a single
zone
• Air introduced at floor level at ~65F
• Spreads along floor level until it
rises due to absorbing heat
• Return grill in ceiling
• Ideal for school classrooms
New Class Room - Test
Benefits of Displacement Ventilation
• Improved indoor air quality
• Superior acoustic performance
• Reduced cooling energy use (initial studies show as much as 35% less energy
usage compared to same size CV application)
• Initial equipment costs comparable to conventional mixing distribution
systems with a significant reduction in operating (energy) costs
Displacement Ventilation Concept
Thermal Plume – Vertical airflow pattern near occupant and equipment
References:
• 2008 ASHRAE HVAC Systems and Design Handbook, chapter 19
• 2008 ASHRAE Journal May 2008 article “Underfloor for Schools”
• Carrier White Paper “Displacement Ventilation Systems”
Single-Zone VAV Application
Single-Zone Variable Air Volume
Single zone (no bypass, no mixing box, etc)
Variable airflow IFM operation – controlled by a space temp sensor
Variable capacity compressor – controlled by factory installed
supply air temp sensor
Heating mode per conventional sequence of operation
A space temperature sensor is required; does not use a
conventional thermostat, thus no multiple zoning.
Can also use a space humidity stat/sensor for
dehumidification
When space humidity is above the setpoint, the unit will reduce the supply
air setpoint until the high humidity condition clears. Fan speed continues to
be controlled by the space temperature.
Single-Zone VAV Application
Good applications for Single-Zone VAV include any
situation where a constant volume unit would be used, but
one or more of the following criteria are desired:
More consistent space conditioning
With the combination of the modulating compressor and variable speed indoor fan, the unit will
be able to maintain a much more consistent space temperature and/or humidity level than a
traditional CV unit which must cycle the compressor on/off.
Energy savings
With the combination of the modulating compressor and variable speed indoor fan, the unit will
use less power over the cooling season if applied correctly
Reduced indoor fan noise
With the variable speed indoor fan, indoor airflow noise & fan start-up noise will be significantly
reduced.
High Humidity Applications
With the combination of the modulating compressor and variable speed indoor fan, when used
with a space humidity sensor or humidistat, the unit will be able to maintain comfortable
humidity conditions better than a conventional unit (without a Humidi-MiZer system).
New Components
Modulation Board – AUX1
sends signal to modulate capacity and fan speed
Copeland Digital Scroll Controller – DSC
operates/modulates the compressor
Digital Scroll Compressor
Allows variable capacity
Variable Frequency Drive – VFD
operates/modulates the indoor fan
New Component Layout
Modulation Board (AUX1)
FAN AUX BOARD
Part number 32GB500442E
J1
J9
This is AUX1
(the full feature board)
Not the AUX2 – Depopulated
Outputs to the DSC and VFD
CH9 CH10
Red and Green LED
for diagnostics same
as the MBB and ECB
J1 – 24vac
Allows LEN access for the ECB
LEN Address – 89
off off off on on off on off
J9 – Duel LEN Communication
CH9 – 0-5vdc output – Commanded Compressor Capacity
CH10 – 0-10vdc output – Commanded Fan speed
Digital Scroll Controller (DSC)
• Part Number – HK61EE001
• Has direct control of compressor
contactor
• Monitors discharge temperature
 DTT- Discharge Temperature
Thermistor (86k @ 25 degree C)
 For compressor high temp protection
• Cycles a solenoid (unloader) to
vary compressor capacity
 Similar to hot gas bypass
• Built in 2 minute anti-short delay
after compressor shutdown
• Activates unloader for first 0.1sec
compressor contactor is energized
and last 0.5sec before shutdown
• Has 7 Alert codes displayed by
LEDs for diagnostics
NO HIGH VOLTAGE
PASSED THROUGH THE
DSC… only low voltage
DSC – Alert Codes
DSC - Operation & Connections
MBB (ComfortLink) tells AUX1 what voltage
to output to the DSC
1-5v scaled to 0-100% capacity
0.04v per 1% starting with 1v. So 10%=1.4v
The DSC min allowed capacity is 11% = 1.44v
ComfortLink min capacity is 15% = 1.6v
INPUTS
24VAC/
24COM
Digital Scroll Controller Power from MBB
T1/T2
Compressor Discharge Temperature
(DTT - 86K ohm thermistor)
C1/C2
Compressor Capacity (1-5vdc signal)
L1/L2
Power for Compressor Contactor and
Unloader contacts (L2 = 24vac, L1 =
common)
For 0% capacity – CLINK outputs 1v
When CLINK outputs 1.6v or higher
DSC closes M1/M2
and
pulses on/off the UC per input voltage
The pulse occurs within a 15 sec window
OUTPUTS
A1/A2
Scroll Compressor Alarm
(input to MBB for alarm)
M1/M2
Compressor A Feedback to MBB and turn
on compressor contactor
U1/U2
Digital Scroll Unloader control and
feedback to MBB
Copeland Digital Scroll Compressor
• Compressor runs in 2 states
 Loaded or Unloaded
 Both states within 15 sec
• Must maintain 75PSI
 Between Suction and discharge
• Must use Solenoid
 EF28XZ121, EF19XZ061
Modulation of Scroll Compressor
Loaded State: Solenoid is De-energized = Compressor Capacity 100%
Unloaded State: Solenoid is Energized = Compressor Capacity 0% but still running
Capacity is an average % based on the time loaded (100%) vs time unloaded (0%)
within one 15 sec window
Time Unloaded vs Time Loaded determines
the capacity
Regardless of demand, CLINK
soft starts compressor until
required capacity is reached
16
14
1st 15 sec – output 15%
15 sec – output 35%
3rd 15 sec – output 55%
4th 15 sec – output 75%
After
1st
min – 100%
Time (sec)
2nd
Seconds
Unloaded
12
10
Seconds
Loaded
8
6
4
2
0
0%
15%
30%
50%
Capacity
75%
100%
VFD
• Part Numbers
 230v 3hp - HK30WA001
 460v 3hp - HK30WA008
 Motor (230/460v 2.4hp)– HD56FR651
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Motor Thermik is still first line defense
Only used to vary the supply fan RPM
No static or pressure reading used
Pre-programmed
No communication, No feedback
Must be in AUTO mode
VFD
Low Voltage Wiring
• 2-10vdc signal and jumpers
• Analog Input Dip switch (AI1)
 Must be set to off (towards “U” for vdc)
 Tells VFD to accept vdc or mA
• 2-10vdc signal form AUX1 wires to
the AI1 and common to AGND
• The data cable connects the remote
display to the base VFD
• Jumpers pre-installed
 Blue is common for discrete input
 Yellow (DI1) remote start/stop
 White (DI4) enable start
VFD
• The MBB determines a fan speed
then tells the AUX1 board to output
a voltage according
 The scale is 0-100% = 2-10vdc
 2vdc = 0 commanded speed
 1% = 0.08 vdc starting at 2v, so 10% =
2.8vdc
• ComfortLink is configurable for
minimum & maximum speed.
(FS.MN / SPEEDMIN & FS.MX /
SPEEDMAX)
• Cooling mode is only mode where fan
speed will vary between min and max
• Vent mode has a configurable speed
(FS.VM / SPEEDVNT)
• Heat mode will always run the fan at
configured max speed
VFD – High Voltage
• VFD is powered by the indoor fan
contactor (IFC)
• High voltage wiring per schematic
and VFD in Forward direction to
allow fan to run in correct rotation
• VFD pre-programmed to accept
2-10vdc as 0-100% and varies the
frequency (0-60Hz) according
VFD
Red/Green Status LED
Target Speed
in frequency
(0-60 Hz)
Operating Status and direction
Must be AUTO and CW (forward)
Time of Day
3 Data Lines - These are
pre-programmed but can
be changed
if enabled
Soft key Functions
• Percent Speed (%SP)
 This is the % the VFD is
currently running the fan
 Range 0-100%
 At steady state this will match
the ComfortLink Fan speed
being displayed
Soft keys
INCREASE/DECREASE or
SCROLL UP/DOWN keys
• Current (A)
 Actual running amps of the
fan
• Analog Input (Vdc)
 The input signal from
ComfortLink (AUX1 board)
 2-10Vdc
HELP key
AUTO key
OFF key
used to
manually
stop the fan
HAND key
VFD Parameters
Start-Up
• Follow same procedure as PG and other
RTUs
• Use service test for air balancing
Max fan speed must still be above min air flow for
heating
• Specific applications require configuration
changes. Table in start-up section of manual
Resources / Literature
• PRB selection and performance data
• Advanced Product Data manual
• Single-Zone VAV Application Tip
• Master Price Pages
• Owners Manual
• Copeland Application Bulletins
• Displacement Ventilation white paper
• Installation instructions
• Controls & Operation manual
- PRB v1.18
- 48pd-01apd
- rooftop-08-12
- 48pd-2ppg, 50pd-2ppg
- 48pdpg-01so
- AE8-1328, AE21-1319
- Dec 08
- 48pd-01si, 50pd-01si
- 48-50PD-01T
• ASHRAE article on DV - Must be an ASHRAE member to download.
http://bookstore.ashrae.biz/journal/journalarticle.php?filename=52008megerson.pdf
• Displacement Ventilation Design Guide - CA Energy Commission
http://www.archenergy.com/ieqk12/Public/Proj2_Deliverables/D2.9c_FinalDVDesignG
uide_2006-0630.pdf
QUESTIONS ?