Carrier WeatherMaster 50HCQ Operation manual

50HCQ
High Efficient
Packaged Rooftop Heat Pump Units
3to10Tons
Product Data
C10222
the environmentally sound refrigerant
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.

2
TABLE OF CONTENTS
PAGE
FEATURES AND BENEFITS 3....................
MODEL NUMBER NOMENCLATURE 4............
FACTORY OPTIONS & ACCESSORIES 5...........
AHRI CAPACITY RATING 8......................
SOUND PERFORMANCE 9.......................
PHYSICAL DATA 10.............................
ELECTRIC HEAT--ELECTRICAL DATA 12..........
WEIGHTS & DIMENSIONS 20....................
OPTION/ACCESSORY WEIGHTS 31...............
APPLICATION DATA 32.........................
PAGE
COOLING TABLES 33...........................
HEATING CAPACITIES 40.......................
STATIC PRESSURE ADDERS 47..................
FAN PERFORMANCE 48.........................
ECONOMIZER, BAROMETRIC RELIEF
AND PE PERFORMANCE 59......................
ELECTRICAL INFO 61...........................
MCA / MOCP 64................................
TYPICAL WIRING DIAGRAMS 80................
SEQUENCE OF OPERATION 86...................
GUIDE SPECIFICATIONS 89......................
Your Carrier Packaged Heat Pump rooftop unit (RTU) was designed by customers for customers. With no--strip screw
collars, handled access panels, and more we’ve made your unit easy to install, easy to maintain and easy to use.
Easy to install:
All WeatherMastertunits are field--convertible to horizontal air flow; no special kit required on 04--09 models. Supply
duct kit required for 12 size only. Convertible airflow design makes it easy to adjust to unexpected job site complications.
Lighter units make easy replacement. Carrier 3 -- 10 ton 50HCQ rooftops fit on existing Carrier curbs dating back to 1989.
Also, our large control box gives you room to work and room to mount Carrier accessory controls.
Easy to maintain:
Easy access handles by Carrier provide quick and easy access to all normally serviced components. Our “no--strip” screw
system has superior holding power and guides screws into position while preventing the screw from stripping the unit’s
metal. Take accurate pressure readings by reading condenser pressure with panels on. Simply remove the black, composite
plug, route your gauge line(s) through the hole, and connect them to the refrigeration service valve(s). Now, you can take
refrigeration system pressure readings without affecting the condenser airflow.
Easy to use:
The newly designed, master terminal board by Carrier puts all your connections and troubleshooting points in one
convenient place, standard. Most low voltage connections are made to the same board and make it easy to find what you’re
looking for and easy to access it.
Reliable:
Each unit comes with precision sized and tested scroll compressor that is internally protected from over temperature and
pressures. Each refrigerant circuit is further protected with a high pressure, loss of charge and freeze protection switch. In
addition, a liquid line filter drier and suction line accumulator protects each circuit. Each unit is factory tested prior to
shipment to help ensure units operation once properly installed.
50HCQ

3
FEATURES AND BENEFITS
SUp to 28% lighter than similar industry units. Lighter rooftops make easier replacement jobs.
S3 -- 10 ton units fit on existing Carrier rooftop curbs which saves time and money on replacement jobs.
SStandardized components and layout. Standardized components and controls make service and stocking parts easier.
SScroll compressors on all units. This makes service, stocking parts, replacement, and troubleshooting easier.
SCrankcase heater on all models (except 04 size) provides added protection in all applications.
SPrecision--sized refrigerant suction line accumulator provides high reliability by preventing liquid from entering the
compressor during low ambient conditions and reverse cycle switch over.
SFiled convertible from vertical to horizontal airflow on all models. No special kits required on 04--09 models. Supply
duct kit required for 12 size model only.
S4--way reversing valve rapidly changes the flow of refrigerant to quickly changeover from cooling to heating and heating
to cooling.
SEasy--adjust, belt drive motor available on all sizes. Carrier provides a factory solution for most points in the fan
performance table. There’s no need for field--supplied drives or motors.
S3--5 ton models come standard with an Electric Drive X13, 5 speed/torque motor to provide exact performance in many
applications. Belt drive motor optional on all three phase voltage models.
SProvisions for bottom or side condensate drain.
SCapable of thru--the--base or thru--the--curb electrical routing.
SDependable time/temperature defrost logic provides a defrost cycle, if needed, every 30, 60, 90 or 120 minutes and is
adjustable.
SSingle--point electrical connection.
SSloped, composite drain pan sheds water; and won’t rust.
SStandardized controls and control box layout. Standardized components and controls make stocking parts and service
easier.
SClean, easy to use control box.
SStandard coils are copper round tube, aluminum plate fin with optional coil coatings and copper fin design.
SColor--coded wiring.
SLarge, laminated wiring and power wiring drawings which are affixed to unit make troubleshooting easy.
SSingle, central terminal board for test and wiring connections.
SFast--access, handled, panels for easy access to the blower and blower motor, control box, and compressors.
S“No--strip” screw system guides screws into the panel and captures them tightly without stripping the screw, the panel, or
the unit.
SExclusive, newly--designed indoor refrigerant header for easier maintenance and replacement.
SStandard mechanical cooling (125_Fto30_For52_Cto--1_C) .
S2--in. (51mm) disposable filters on all units.
SHigh capacity refrigerant filter drier and TXV metering device on each circuit.
SHigh pressure switch, loss of charge switch and freeze protection adds greater unit reliability.
50HCQ

4
MODEL NUMBER NOMENCLATURE
123456789101112131415161718
5 0 H C Q A 0 6 A 0 A 6 A 0 B 0 A 0
____________ ____
Series Weathermaster Packaging
50HC = Packaged Rooftop 0=Standard
High Efficiency 1=LTL
Heat Size Electrical Options
Q=HeatPump A=None
C = N o n --- f u s e d d i s c
D=Thruthebase
Refrig. System Options F = Non ---fused & thru the base
A = 1---stage cooling models
D = 2--- stg. cooling models Service Options
0=None
Cooling Tons 1 = Unpowered convenience outlet
04 = 3 Ton 08 = 7.5 Ton 2 = Powered convenience outlet
05 = 4 Ton 09 = 8.5 Ton 3 = Hinged Panels
06 = 5 Ton 12 = 10 Ton 4 = Hinged Panels Unpowered CO
07 = 6 Ton 5 = Hinged Panels Powered CO
Intake / Exhaust Options
A=None
Sensor Options B=Tempeconow/barorelief
A=None F = Enthalpy econo w/ baro relief
B = RA smoke detector K = 2 position damper
C = SA smoke detector
D=RA&SAsmokedetector Base Unit Controls
E=CO
2sensor 0 = Electromechanical
F = RA smoke detector & CO21 = PremierLink™ DDC controller
G = SA smoke detector & CO22 = RTU Open multi--- protocol DDC controller
H=RA&SAsmokedetector&CO
2
Design Rev
Indoor Fan Options Factory assigned
0 = Electric drive X13 motor (04---06)
1 = Standard static option --- Belt drive Voltage
2 = Medium static option --- Belt drive 1 = 575/3/60
3 = High static option --- Belt drive 3 = 208--- 230/1/60
C = High static option with High Eff. Motor --- Belt Drive (12 only) 5 = 208--- 230/3/60
6 = 460/3/60
Coil Options (Outdoor --- Indoor --- Hail Guard)
A = Al/Cu --- Al/Cu
B = P r e c o a t A l / C u --- A l / C u
C = E --- c o a t A l / C u --- A l / C u
D = E --- c o a t A l / C u --- E c o a t A l / C u
E = C u / C u --- A l / C u
F = Cu/Cu --- Cu/Cu
M = A l / C u --- A l / C u --- L o u v e r e d H a i l G u a r d s
N = P r e c o a t A l / C u --- A l / C u --- L o u v e r e d H a i l G u a r d s
P = E --- c o a t A l / C u --- A l / C u --- L o u v e r e d H a i l G u a r d s
Q = E --- c o a t A l / C u --- E --- c o a t A l / C u --- L o u v e r e d H a i l G u a r d s
R = C u / C u --- A l / C u --- L o u v e r e d H a i l G u a r d s
S = C u / C u --- C u / C u --- L o u v e r e d H a i l G u a r d s
50HCQ

5
FACTORY OPTIONS AND/OR ACCESSORIES
Table 1 – FACTORY INSTALLED OPTIONS AND FIELD--INSTALLED ACCESSORIES
CATEGORY ITEM
FACTORY
INSTALLED
OPTION
FIELD
INSTALLED
ACCESSORY
Cabinet
Hinged access doors X
T h r u --- t h e --- b a s e e l e c t r ic a l c o n n e c t i o n s X X
Suuply duct kit--- Horizontal air applications (size 12 only) X
Coil Options
Cu/Cu indoor and/or outdoor coils X
Pre--- coated outdoor coils X
Premium, E--- coated outdoor coils X
Condenser Protection Condenser coil hail guard (louvered design) X X
Controls
Thermostats, temperature sensors, and subbases X
PremierLink DDC communicating controller X X
RTU Open Multi---protocol controller X
Smoke detector (supply and/or return air) X
Time Guard II compressor delay control circuit X
Phase Monitor X
Economizers
& Outdoor Air
Dampers
EconoMi$er IV (for electro--- mechanical controlled RTUs) X X
EconoMi$er2 (for DDC controlled RTUs) X X
Motorized 2 position outdoor air damper X X
Manual outdoor air damper (25% and 50%) X
Barometric relief1X X
Power exhaust X
Economizer Sensors &
IAQ Devices
Single dry bulb temperature sensors2X X
Differential dry bulb temperature sensors2X
Single enthalpy sensors2X X
Differential enthalpy sensors2X
CO2sensor (wall, duct, or unit mounted)2X X
Electric Heat Electric Resistance Heaters X
Single Point Kit X
Indoor Motor & Drive Multiple motor and belt drive packages X
Electric Drive, X13, 5---speed/torque (3--- 5 ton) X
Low Ambient Control Motormaster head pressure controller3X
Power
Options
Convenience outlet (powered) X
Convenience outlet (unpowered) X
Non --- fused disconnect X
Roof Curbs Roof curb 14--- in. (356mm) X
Roof curb 24--- in. (610mm) X
NOTES:
1. Included with economizer.
2. Sensors for optimizing economizer.
3. See application data for assistance.
50HCQ

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FACTORY OPTIONS AND/OR ACCESSORIES (cont.)
Economizer (dry bulb or enthalpy)
Economizers save money. They bring in fresh, outside air
for ventilation; and provide cool, outside air to cool your
building. This is the preferred method of low ambient
cooling. When coupled to CO2sensors, economizers can
provide even more savings by coupling the ventilation air
to only that amount required.
Economizers are available, installed and tested by the
factory, with either enthalpy or dry bulb temperature
inputs. There are also models for electromechanical as
well as direct digital controllers. Additional sensors are
available as accessories to optimize the economizers.
Economizers include gravity controlled, barometric relief
which equalizes building pressure and ambient air
pressures. This can be a cost effective solution to prevent
building pressurization.
CO2Sensor
Improves productivity and saves money by working with
the economizer to intake only the correct amount of
outside air for ventilation. As occupants fill your building,
the CO2sensor detects their presence through increasing
CO2levels, and opens the economizer appropriately.
When the occupants leave, the CO2levels decrease, and
the sensor appropriately closes the economizer. This
intelligent control of the ventilation air, called Demand
Control Ventilation (DCV) reduces the overall load on the
rooftop, saving money.
Smoke Detectors
Trust the experts. Smoke detectors make your application
safer and your job easier. Carrier smoke detectors
immediately shut down the rooftop unit when smoke is
detected. They are available, installed by the factory, for
supply air, return air, or both.
Louvered Hail Guards
Sleek, louvered panels protect the condenser coil from
hail damage, foreign objects, and incidental contact.
Convenience Outlet (powered or unpowered)
Lower service bills by including a convenience outlet in
your specification. Carrier will install this service feature
at our factory, powered or unpowered. Provides a
convenient, 15 amp, 115V GFCI receptacle.
Non--fused Disconnect
This OSHA--compliant, factory installed, safety switch
allows a service technician to locally secure power to the
rooftop.
Power Exhaust Pressure Relief
Superior internal building pressure control. This
field--installed accessory may eliminate the need for
costly, external pressure control fans.
PremierLink
This CCN controller regulates your rooftop’s performance
to tighter tolerances and expanded limits, as well as
facilitates zoning systems and digital accessories. It also
unites your Carrier HVAC equipment together on one,
coherent CCN network. The PremierLink can be factory
installed, or easily field--installed.
RTU Open, Multi--protocol Controller
Connect the rooftop to an existing BAS without needing
complicated translators or adapter modules using the RTU
Open controller. This new controller speaks the 4 most
common building automation system languages (Bacnet,
Modbus, N2, and Lonworks). Use this controller when
you have an existing BAS.
Time Guard II Control Circuit
This accessory protects your compressor by preventing
short--cycling in the event of some other failure, prevents
the compressor from restarting for 30 seconds after
stopping. Not required with PremierLink, RTU Open, or
authorized commercial thermostats.
Motorized 2--Position Damper
The new Carrier 2--position, motorized outdoor air damper
admits up to 100% outside air. Using reliable, gear--driven
technology, the 2--position damper opens to allow
ventilation air and closes when the rooftop stops, stopping
unwanted infiltration.
Manual OA Damper
Manual outdoor air dampers are an economical way to
bring in ventilation air. The dampers are available in 25%
and 50% versions.
50HCQ

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FACTORY OPTIONS AND/OR ACCESSORIES (cont.)
Motormaster Head Pressure Controller
The Motormaster motor controller is a low ambient, head
pressure controller kit that is designed to maintain the
unit’s condenser head pressure during periods of low
ambient cooling operation. This device should be used as
an alternative to economizer free cooling when
economizer usage is either not appropriate or desired. The
Motormaster will either cycle the outdoor fan motors or
operate them at reduced speed to maintain the unit
operation, depending on the model.
Alternate Motors and Drives
Some applications need larger horsepower motors, some
need more airflow, and some need both. Regardless of the
case, your Carrier expert has a factory installed
combination to meet your application. A wide selection of
motors and pulleys (drives) are available, factory
installed, to handle nearly any application.
Thru--the--Base Connections
Thru--the--base connections, available as either an
accessory or as a factory option, are necessary to ensure
proper connection and seal when routing wire and piping
through the rooftop’s basepan and curb. These couplings
eliminate roof penetration and should be considered for
main power lines, as well as control power.
Electric Heaters
Carrier offers a full line of field--installed accessory
heaters. The heaters are very easy to use and install. All
are pre--engineered and certified.
Hinged Access Panels
Allows access to unit’s major components with
specifically designed hinged access panels. Panels are:
filter, control box, fan motor and compressor.
50HCQ

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Table 2 – AHRI COOLING RATING TABLES
COOLING MODE
UNIT NOM. CAPACITY
(TONS)
NET COOLING CAPACITY
(BTUH)
TOTAL POWER
(kW) SEER EER IEER
A04 336,400 2.8 15.60 12.70 N/A
A05 447,000 3.6 15.80 12.80 N/A
A06 558,500 4.6 15.00 12.50 N/A
A07 672,000 6.0 N/A 12.00 12.8
D08 7.5 90,000 7.4 N/A 12.10 12.8
D09 8.5 100,000 8.3 N/A 12.00 12.5
D12 10 119,000 9.8 N/A 12.30 13.0
NA Not applicable
HEATING MODE
UNIT HSPF HEATING, LOW HEATING, HIGH
CAPACITY (BTUH) COP CAPACITY (BTUH) COP
A04 8.00 18,400 N/A 34,000 N/A
A05 8.10 23,800 N/A 46,000 N/A
A06 8.20 28,600 N/A 55,000 N/A
A07 n/a 39,000 2.40 70,000 3.40
D08 n/a 47,000 2.40 84,000 3.50
D09 n/a 56,000 2.26 100,000 3.40
D12 n/a 65,000 2.40 116,000 3.50
LEGEND
AHRI --- Air Conditioning, Heating and Refrigeration
Institute
ASHRAE --- American Society of Heating, Refrigerating
and Air Conditioning, Inc.
COP --- Coefficient of Performance
EER --- Energy Efficiency Ratio
HSPF --- Heating Seasonal Performance Factor
IEER --- Integrated Energy Efficiency Ratio
SEER --- Seasonal Energy Efficiency Ratio
NOTES:
1. Rated and certified under AHRI Standard 210/240 or
340/360, as appropriate.
2. Ratings are based on:
Cooling Standard: 80_F(27_C) db, 67_F(19_C) wb
indoor air temp and 95_F db outdoor air temp.
IEER Standard: A measure that expresses cooling part---
load EER efficiency for commercial unitary air condition-
ing and heat pump equipment on the basis of weighted
operation at variable load capacities.
3. All 50HCQ units comply with ASHRAE 90.1 Energy
Standard for minimum SEER and EER requirements.
50HCQ

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Table 3 – MINIMUM -- MAXIMUM AIRFLOWS ELECTRIC HEAT
UNIT COOLING ELECTRIC HEATERS
MINIMUM MAXIMUM MINIMUM MAXIMUM
50HCQA04 900 1500 900 1500
50HCQA05 1200 2000 1200 2000
50HCQA06 1500 2500 1500 2500
50HCQA07 1800 3000 1800 3000
50HCQD08 2250 3750 2250* 3750
50HCQD09 2550 4250 2552* 4250
50HCQD12 3000 5000 3000* 5000
*Minimum electric heat CFM exceptions :
UNIT UNIT VOLTAGE HEATER kW UNIT
CONFIGURATION
REQUIRED MINIMUM
CFM
50HCQD08
50HCQD09 575 17.0 Horizontal or Vertical 2800
34.0 2350
50HCQD12
230 50.0 Vertical 3550
Horizontal 3420
43.5 Horizontal or Vertical 3040
575
50.0 Vertical 3150
33.5 3520
Horizontal 3420
26.5 Vertical 3610
Table 4 – SOUND PERFORMANCE TABLE
50HCQ OUTDOOR SOUND (dB)
A --- W E I G H T E D 63 125 250 500 1000 2000 4000 8000
A04 76 51.8 69.0 64.6 67.8 70.7 63.8 60.9 59.0
A05 79 56.1 69.6 68.7 72.5 72.8 68.9 65.0 61.2
A06 79 57.7 66.6 68.7 72.9 74.5 71.1 67.6 62.6
A07 81 86.7 82.7 79.1 78.4 75.4 71.2 67.8 62.9
D08 83 87.3 81.6 79.7 80.6 79.0 73.5 69.2 66.1
D09 87 61.7 74.7 77.4 82.6 84.9 81.9 78.8 75.9
D12 83 61.0 67.3 75.1 77.7 78.1 75.5 71.2 66.7
LEGEND
dB --- Decibel
NOTES:
1. Outdoor sound data is measured in accordance with
AHRI standard 270 ---95.
2. Measurements are expressed in terms of sound power.
Do not compare these values to sound pressure values
because sound pressure accounts for specific environ-
mental factors which do not match individual applica-
tions. Sound power values are independent of the envir-
onment and therefore more accurate.
3. A---weighted sound ratings filter out very high and very
low frequencies, to better approximate the response of
an “average” human ear. A ---weighted measurements for
Carrier units are taken in accordance with 270---95.
50HCQ

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Table 5 – PHYSICAL DATA (COOLING) 3 -- 6 TONS
50HCQA04 50HCQA05 50HCQA06 50HCQA07
Refrigeration System
# Circuits / # Comp. / Type 1/1/Scroll 1/1/Scroll 1/1/Scroll 1/1/Scroll
Refrig. charge per circuit A/B(lbs---oz) 1 2 --- 8 / --- 1 5 --- 8 / --- 1 7 --- 8 / --- 1 5 --- 8 / ---
Metering Device TXV TXV TXV TXV
High pressure Trip / Reset (psig) 630 / 505 630 / 505 630 / 505 630 / 505
Loss of Charge Press. Trip / Reset (psig) 27 / 44 27 / 44 27 / 44 27 / 44
Compressor Capacity Staging (%) 100 100 100 100
Evap. Coil
M a t e r i a l --- Tu b e / F i n Cu / Al Cu / Al Cu / Al Cu / Al
Coil type 3/8” RTPF 3/8” RTPF 3/8” RTPF 3/8” RTPF
Rows / FPI 3 / 15 3/15 4/ 15 3/ 15
Tota l Fa ce Ar e a (ft2)5.5 7.3 7.3 8.9
Condensate Drain Conn. Size 3/4” 3/4” 3/4” 3/4”
Evap. Fan and Motor
Standard Static
1phase
Motor Qty / Drive Type 1/Direct 1/Direct 1/Direct N/A
Max BHP 1.0 1.0 1.0 N/A
RPM Range 600---1200 600--- 1200 600---1200 N/A
Motor Frame Size 48 48 48 N/A
Fan Qty / Type 1/Centrifugal 1/Centrifugal 1/Centrifugal N/A
Fan Diameter x Length (in) 10 x 10 10 x 10 11 x 10 N/A
Standard Static
3phase
Motor Qty / Drive Type 1/Direct 1/Direct 1/Direct 1/Belt
Max BHP 1.0 1.0 1.0 1.2
RPM Range 600---1200 600---1200 600--- 1200 489---747
Motor Frame Size 48 48 48 56
Fan Qty / Type 1/Centrifugal 1/Centrifugal 1/Centrifugal 1/Centrifugal
Fan Diameter x Length (in) 10 x 10 10 x 10 11 x 10 15 x 15
Medium Static
3phase
Motor Qty / Drive Type 1/Belt 1/Belt 1/Belt 1/Belt
Max BHP 1.5 1.5 2.0 2.9
RPM Range 819---1251 920--- 1303 1066---1380 733---949
Motor Frame Size 56 56 56 56
Fan Qty / Type 1/Centrifugal 1/Centrifugal 1/Centrifugal 1/Centrifugal
Fan Diameter x Length (in) 10 x 10 10 x 10 10 x 10 15 x 15
High Static
3phase
Motor Qty / Drive Type 1/Belt 1/Belt 1/Belt 1/Belt
Max BHP 2.0 2.0 2.9 4.0
RPM Range 1035---1466 1035---1466 1208--- 1639 909---1102
Motor Frame Size 56 56 56 145
Fan Qty / Type 1/Centrifugal 1/Centrifugal 1/Centrifugal 1/Centrifugal
Fan Diameter x Length (in) 10 x 10 10 x 10 10 x 10 15 x 15
Cond. Coil
Material--- Tube/Fin Cu/Al Cu / Al Cu / Al Cu / Al
Coil type 3/8” RTPF 3/8” RTPF 3/8” RTPF 3/8” RTPF
Rows / FPI 2 / 17 2/17 2/17 2/17
Tota l Fa ce Ar e a (ft2) 16.5 21.3 21.3 20.5
Cond. fan / motor
Qty / Motor Drive Type 1 / direct 1/direct 1/direct 2/direct
Motor HP / RPM 1/8 / 825 1/4 / 1100 1/4 / 1100 1/4 / 1100
Fan diameter (in) 22 22 22 22
Filters
RAFilter#/Size(in) 2/16x25x2 4/16x16x2 4/16x16x2 4/16x20x2
OA inlet screen # / Size (in) 1/20x24x1 1/20x24x1 1/20x24x1 1/20x36x1
50HCQ