product training 48/50pd series copyright © carrier corp. 2008
TRANSCRIPT
Product Training
48/50PD Series
Copyright © Carrier Corp. 2008
Agenda
1. Overview
2. Applications
3. New Components
4. Start-Up
5. Resources
Centurion 48/50PD OverviewWhat 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
• 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
Variable Capacity Digital Scroll
15% - 100% of full load
Ton Range 1 2 3 4 5
5 ton
4 ton
48 / 50 PD
Range
Range
Variable Speed IFM Drivecan vary fan speed from 20% - 100%
Overview - How it Works
Applications• Displacement Ventilation (DV)
Specific specification per jobSpecific Duct and installation (new construction)Unique unit software configuration settingsDry climate regions
• Single Zone VAVStandard duct and installationNot approved for multiple zone controlNot 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 - TestBenefits 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 ApplicationSingle-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 dehumidificationWhen 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 conditioningWith 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 savingsWith 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 noiseWith the variable speed indoor fan, indoor airflow noise & fan start-up noise will be significantly reduced.
High Humidity ApplicationsWith 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 – AUX1sends signal to modulate capacity and fan speed
Copeland Digital Scroll Controller – DSCoperates/modulates the compressor
Digital Scroll CompressorAllows variable capacity
Variable Frequency Drive – VFDoperates/modulates the indoor fan
New Component Layout
Modulation Board (AUX1)
FAN AUX BOARDPart number 32GB500442E
This is AUX1(the full feature board)Not the AUX2 – Depopulated
Outputs to the DSC and VFD
Allows LEN access for the ECB
J9J1
CH10CH9
J1 – 24vac
J9 – Duel LEN Communication
CH9 – 0-5vdc output – Commanded Compressor Capacity
CH10 – 0-10vdc output – Commanded Fan speed
LEN Address – 89 off off off on on off on off
Red and Green LED for diagnostics same as the MBB and ECB
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
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 andUnloader contacts (L2 = 24vac, L1 =
common)
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
MBB (ComfortLink) tells AUX1 what voltage to output to the DSC
1-5v scaled to 0-100% capacity0.04v per 1% starting with 1v. So 10%=1.4v
The DSC min allowed capacity is 11% = 1.44vComfortLink min capacity is 15% = 1.6v
For 0% capacity – CLINK outputs 1v
When CLINK outputs 1.6v or higherDSC closes M1/M2andpulses on/off the UC per input voltage
The pulse occurs within a 15 sec window
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 CompressorLoaded 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
0
2
4
6
8
10
12
14
16
Tim
e (
se
c)
0% 15% 30% 50% 75% 100%
Capacity
Time Unloaded vs Time Loaded determines the capacity
SecondsUnloaded
SecondsLoaded
Regardless of demand, CLINK soft starts compressor until required capacity is reached
1st 15 sec – output 15%
2nd 15 sec – output 35%
3rd 15 sec – output 55%
4th 15 sec – output 75%
After 1st min – 100%
VFD• Part Numbers
230v 3hp - HK30WA001460v 3hp - HK30WA008Motor (230/460v 2.4hp)– HD56FR651
• 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
VFDLow 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-installedBlue is common for discrete inputYellow (DI1) remote start/stopWhite (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
3 Data Lines - These are pre-programmed but can be changed
• Percent Speed (%SP)This is the % the VFD is
currently running the fanRange 0-100%At steady state this will match
the ComfortLink Fan speed being displayed
• Current (A)Actual running amps of the fan
• Analog Input (Vdc)The input signal from
ComfortLink (AUX1 board)2-10Vdc
Red/Green Status LED
Operating Status and direction Must be AUTO and CW (forward)
Soft key Functions
HAND key
OFF key used to manually stop the fan
Soft keys
AUTO key HELP key
INCREASE/DECREASE or SCROLL UP/DOWN keys
Time of Day if enabled
Target Speed in frequency (0-60 Hz)
VFD Parameters
Start-Up• Follow same procedure as PG and other
RTUs
• Use service test for air balancingMax 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 - PRB v1.18•Advanced Product Data manual - 48pd-01apd•Single-Zone VAV Application Tip - rooftop-08-12•Master Price Pages - 48pd-2ppg, 50pd-2ppg•Owners Manual - 48pdpg-01so•Copeland Application Bulletins - AE8-1328, AE21-1319•Displacement Ventilation white paper - Dec 08• Installation instructions - 48pd-01si, 50pd-01si•Controls & Operation manual - 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_FinalDVDesignGuide_2006-0630.pdf
QUESTIONS ?