Carrier 50PEC09-18 Aquazone Operation manual

Copyright 2008 Carrier Corporation Form 50PEC-1PD
Single-package console water source
heat pump with self-contained line
voltage thermostats.
• Puron (R-410A) non-ozone
depleting refrigerant
• Suitable for either geothermal or
boiler/tower applications with
operating temperature range from
20 F to 110 F.
• Thermostatic expansion valve
(TXV) provides efficient and reliable
refrigerant flow
• Rubber grommet mounted
compressors for quiet operation
• Sloped top cabinet with powder
paint finish
• Right or left hand piping connection
• Multiple unit-mounted and remote
thermostat options
• Adaptable cabinet and subbase
configurations
• Factory-mounted flow regulators and
control valves for easy installation
• Flexible and reliable controls
accommodate all systems
Features/Benefits
Carrier’s Aquazone console
water source heat pumps are
a flexible, attractive
alternative for all finished
interior space, under-window
style installations.
Operating efficiency
Aquazone water source heat pump
(WSHP) units are designed for quality
and performance excellence over their
lifetime. Units offer standard cooling
EERs (energy efficiency ratios) up to
13.5 for boiler/tower systems and as
high as 21.3 for geothermal applica-
tions. Heating COPs (coefficients of
performance) are as high as 5.1,
among the highest in the industry.
AQUAZONE™
50PEC09-18
Water Source Heat Pumps
Console Unit
with PURON® (R-410A) Refrigerant
3/4to 11/2Nominal Tons
Product
Data
TM

2
Quiet operation
The Carrier console WSHP provides
exceptionally quiet operation for maxi-
mum comfort.
Design flexibility
Aquazone™ console WSHP units are
offered in 5 capacity sizes to meet indi-
vidual zone needs efficiently and effec-
tively. Standard and extended operat-
ing range units are available to suit a
variety of application requirements.
Safe, reliable operation
Standard safety features include: high
and low pressure monitoring and field
selectable water and air coil freeze pro-
tection sensing. All safety controls may
be reset at the thermostat. Each unit is
tested and run at the factory to ensure
proper operation of all components
and safety switches.
All components are carefully
designed and selected for endurance,
durability, and carefree day-to-day
operation.
The water-to-refrigerant heat
exchanger has copper inner and steel
outer tubing which is painted on the
outside to provide corrosion resistance
protection. Cupronickel heat exchang-
ers are available and should be used on
all open loop applications.
Units are rated and certified in ac-
cordance with ARI (Air Conditioning
and Refrigeration Institute)/ISO (Inter-
national Organization for Standardiza-
tion)/ASHRAE (American Society of
Heating, Refrigerating and Air Condi-
tioning Engineers) 13256-1 perfor-
mance standard, and are CSA (Canadi-
an Standards Association)/NRTL (Na-
tionally Recognized Testing Lab) listed.
Installation ease
The unit is packaged for simple, low
cost handling, with minimal time re-
quired for installation. The console unit
arrives at the jobsite fully assembled to
minimize installation time and reduce
installation cost. All units are pre-wired
and factory charged with R-410A
refrigerant.
Water connections are available in a
variety of configurations direct from
the factory. The standard configuration
is 5/8in. OD sweat connections for
maximum flexibility in the field. Both
FPT and MPT are available as factory-
installed options to improve installation
efficiency. Additionally, factory-
installed motorized water shutoff
valves are available for use on energy
conserving systems employing a
variable pumping technique.
The standard electrical connections
are made quickly and directly to a pow-
er distribution terminal block. To fur-
ther improve installation efficiency, a
fused or unfused disconnect switch as
well as a 20 amp plug and cord are
available as factory-installed options.
A 5/8in. ID vinyl condensate con-
nection is provided for connection to
the field-installed condensate line.
Compact cabinet design dimen-
sions are 12 in. deep, 48 in. wide and
24 in. tall (with 3 in. subbase). For flex-
ibility, the controls can be mounted on
the top right or left side. Additionally,
the sloped top design discourages the
use of the unit as a shelf or coffee hold-
er, preventing air blockage and any
spills from damaging the unit.
No-fuss maintenance and
serviceability
Regular maintenance or service to the
console WSHP units require little time.
Large service access panels enable
quick inspection for problem solving
and the control box swings down for
easy access to the controls.
Fan motor sleeve bearings are
permanently lubricated for worry-free
performance. If the unit does require
service, an easily removable cabinet
and slide-out fan section make access
simple.
Refrigerant circuit protection is de-
signed to result in fewer service calls.
Units are equipped with easily accessi-
ble service access ports on both the
suction and the discharge refrigerant
lines for on-site testing and environ-
mentally correct refrigerant recovery.
Filter racks provide easy filter access
for cleaning.
Maximum control flexibility
Aquazone water source heat pumps
provide reliable control operation using
a standard microprocessor board.
Flexible alternatives for many direct
digital controls (DDC) applications in-
clude the Carrier Comfort Network®
(CCN) and open protocol systems.
Carrier’s Aquazone standard unit
solid-state control system, the Com-
plete C, provides control of the unit
compressor, reversing valve, fan, safety
features, and troubleshooting fault indi-
cation features. The Complete C is
one of the most user friendly, low cost,
and advanced control boards found in
the WSHP industry. Many features are
field selectable to provide the ultimate
Features/Benefits (cont)
Table of contents
Page
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ARI/ISO Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-19
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20,21
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-26
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27-30
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Typical Control Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . .31-40
Typical Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42-45

3
in field installation flexibility. The
overall features of this standard control
system include:
50-va transformer —Assists in
accommodating accessory loads.
Anti-short cycle timer —Provides a
minimum off time to prevent the unit
from short cycling. The 5-minute timer
energizes when the compressor is
deenergized, resulting in a 5-minute
delay before the unit can be restarted.
Random start relay — Ensures a
random delay in energizing each differ-
ent WSHP unit. This option minimizes
peak electrical demand during start-up
from different operating modes or after
building power outages.
High and low pressure refrigerant
protection —Safeguards against
unreliable unit operation and prevents
refrigerant from leaking.
Condensate overflow sensor —
Electronic sensor mounted to the drain
pan. When condensate pan liquid
reaches an unacceptable level, the unit
is automatically deactivated and placed
in a lockout condition. The sensor
recognizes thirty continuous seconds
of overflow as a fault condition.
High and low voltage protection —
Safety protection for excessive or low
voltage conditions.
Automatic intelligent reset —Unit
shall automatically restart 5 minutes
after shutdown if the fault has cleared.
Should a fault occur 3 times sequen-
tially, lockout will occur.
Accessory output —In applications
such as variable speed pumping, a
24-v output cycles a motorized water
valve or damper actuator with
compressor.
Performance monitor (PM) —
Unique feature monitors water temper-
atures to warn when the heat pump
is operating inefficiently or beyond
typical operating range. A field select-
able switch initiates a warning code on
the unit display.
Water coil freeze protection
(selectable for water or anti-
freeze) —Field selectable switch for
water and water/glycol solution sys-
tems initiates a fault when tempera-
tures exceed the selected limit for
30 continuous seconds.
Air coil freeze protection (check
filter operation) —Field selectable
switch for assessing excessive filter
pressure drop initiates a fault when
temperatures exceed the selected limit
for 30 continuous seconds.
Alarm relay setting — Selectable
24-v or pilot duty dry contact provides
remote alarm activation.
Electric heat option —Output pro-
vided on the controller for operating
two stages of emergency electric heat.
Service Test mode with diagnostic
LED (light-emitting diode) —Test
mode allows service personnel to
check the operation of the WSHP and
control system efficiently. Upon enter-
ing Test mode, time delays speed up,
and the Status LED flashes a code
indicating the last fault. This mode
provides easy fault diagnosis; based on
the fault code the status LED flashes,
Carrier provided troubleshooting tables
provide easy reference to typical
problems.
LED visual output —An LED panel
indicates high pressure, low pressure,
low voltage, high voltage, air/water
freeze protection, condensate over-
flow, and control status.
PremierLink™ controller adds
reliability, efficiency, and
simplification
The PremierLink direct digital control-
ler can be ordered as a factory-installed
option. Designed and manufactured
exclusively by Carrier, the controller
can be used to actively monitor and
control all modes of operation as well
as monitor the following diagnostics
and features: unit number, zone tem-
perature, zone set point, zone humidity
set point, discharge air temperatures,
fan status, stages of heating, cooling
stages, outdoor-air temperature,
leaving-air temperature, leaving water
temperature, alarm status, and alarm
lockout condition.
This controller has 38.4 kilobaud
communications capability and is com-
patible with ComfortLink™ controls,
CCN and ComfortVIEW™ software.
The scrolling marquee and Navigator™
device are optional tools used for pro-
gramming and monitoring the unit for
optimal performance. Adding the
Carrier CO2sensor in the conditioned
space provides ASHRAE 62-99 com-
pliance and demand controlled ventila-
tion (DCV). A DCV control strategy is
especially beneficial for a water source
heat pump system to minimize the en-
ergy used to condition ventilation air.
The DCV approach enhances the en-
ergy efficient performance of the
Aquazone units.
The PremierLink peer-to-peer,
Internet ready communicating control
is designed specifically for constant vol-
ume and variable volume temperature
applications. This comprehensive con-
trols system allows water source heat
pumps to be linked together, creating a
fully functional HVAC (heating, ventila-
tion, and air conditioning) automation
system.
Puron® (R-410A) refrigerant
Puron (R-410A) refrigerant is a non-
chlorine based refrigerant. Puron
(R-410A) refrigerant characteristics,
compared to R-22, have:
• Binary and near azeotropic mixture
of 50% R-32 and 50% R-125.
• Higher efficiencies (50 to 60%
higher operating pressures).
• Non-ozone depleting potential and
low global warming potential.
• Virtually no glide. Unlike other alter-
native refrigerants, the two compo-
nents in Puron (R-410A) refrigerant
have virtually the same leak rates.
Therefore, refrigerant can be added
if necessary without recovering the
charge.
E-coated (electro-coated) air
coils
Carrier’s 50PEC units are available
with an optional E-coated air coil. This
electro-coating process will provide
years of protection against corrosion
from airborne chemicals. Modern
building materials, such as counter-
tops, floor coverings, paints and other
materials, can “outgas” chemicals into
the indoor air. Some of these chemi-
cals are suspected of contributing to
corrosion in the air coils found in both
traditional and geothermal heating and
cooling equipment. Corrosion often re-
sults in refrigerant leaks and eventual
failure of the air coil costing hundreds
of dollars to replace. Studies have also
shown that these air coil coatings im-
prove moisture shedding and therefore
improve a units moisture removal ca-
pability resulting in a more comfortable
indoor environment. The 50PEC units
assure both maximum air coil life and
comfort.

4
Model number nomenclature
Aquazone™ Water Source Heat Pump
Console Unit with Puron® (R-410A)
Refrigerant
**
NRTL/C
As an ENERGY STAR® Part-
ner, Carrier Corporation has
determined that this product
meets the ENERGY STAR
guidelines for energy efficiency.
LEGEND
*See table for autoflow regulator sizing.
†Right and left hand orientation is determined by looking at front of unit.
**Sizes 09-12 only.
NOTES:
1. Standard 60 Hz unit controls are ETL listed.
2. Complete C controllers take 50-va transformers. Deluxe D controllers take
75-va transformers. All DDC controllers take 75-va transformers.
3. The 50PEC09-15 unit cabinets are 48 in. with ½ in. water connections. The
50PEC18 unit cabinet is 54 in. with ¾ in. water connections.
DDC — Direct Digital Control
AUTOFLOW REGULATOR SIZING
50PEC
UNIT SIZE 2.25 gpm/ton 3.0 gpm/ton
09 2.0 2.5
12 2.5 3.0
15 3.0 3.5
18 3.5 4.0
a50-8312

5
LEGEND NOTES:
1. Ratings are in accordance with and certified to ARI/ISO Standard
13256-1:2007.
2. Cooling capacities based upon 80.6 F db, 66.2 F wb entering air
temperature.
3. Heating capacities based upon 68 F db, 59 F wb entering air tem-
perature.
4. All airflow is rated on high speed. Units factory-shipped on medium
and low motor taps.
5. All ratings based upon operation at lower voltage of dual voltage
rated models.
Physical data
50PEC
UNIT
SIZE
WATER LOOP HEAT PUMP GROUND WATER HEAT PUMP GROUND LOOP HEAT PUMP
Cooling 86 F Heating 68 F Cooling 59 F Heating 50 F Cooling 77 F Heating 32 F
Capacity
(Btuh)
EER
(Btuh/W)
Capacity
(Btuh) COP Capacity (Btuh)
EER
(Btuh/W)
Capacity
(Btuh) COP Capacity (Btuh)
EER
(Btuh/W)
Capacity
(Btuh) COP
09 8,600 13.3 11,400 4.6 9,200 18.6 9,500 4.0 8,800 14.9 7,300 3.3
12 11,300 13.3 14,900 4.9 12,500 18.7 12,100 4.1 11,800 15.1 9,300 3.7
15 14,100 13.5 18,200 5.1 16,600 21.3 14,800 4.3 15,100 15.8 11,400 3.5
18 16,200 13.0 20,100 4.5 17,600 19.5 16,500 4.0 16,500 15.0 13,200 3.4
COP — Coefficient of Performance
db — Dry Bulb Temperature
EER — Energy Efficiency Ratio
wb — Wet Bulb Temperature
BASE UNIT 50PEC 09 12 15 18
NOMINAL COOLING CAPACITY (Btuh) 9,300 12,300 13,800 16,000
COMPRESSOR Rotary
BLOWER
Motor Horsepower
Wheel Size D x W (in.) 2 each
1/20
51/4x 61/4
1/12
51/4x 61/4
1/8
51/4x 61/4
1/8
51/4x 61/4
FILTER SIZE (in.) Bottom Return (Qty) 10 x 30 x 1 (1) 10 x 30 x 1 (1) 10 x 30 x 1 (1) 10 x 16 x 1(2)
FILTER SIZE (in.) Front Return (Qty) 7 x 291/2x 1/8(1) 7 x 291/2x 1/8(1) 7 x 291/2x 1/8(1) 7 x 311/2x 1/8(1)
UNIT WEIGHT (lb)
Shipping
Operating
185
175
190
180
200
190
232
220
REF. TO AIR HEAT EXCHANGER
Face Area (sq ft)
No. of Rows Deep
Copper Tube Size OD (in.)
Fin Spacing (FPI)
1.4
2
3/8
13
1.4
3
3/8
13
1.8
3
3/8
13
1.8
3
3/8
12
REFRIG. CHARGE (R-410A)/CKT (oz)
No. of Circuits
28
1
29
1
37
1
39
1
UNIT CABINET WITH BOTTOM RETURN WITH STANDARD
5 in. SUBBASE Width x Height x Depth (in.) 48 x 26 x 12 48 x 26 x 12 48 x 26 x 12 54 x 26 x 12
UNIT CABINET WITH FRONT RETURN
(NO SUBBASE) Width x Height x Depth (in.) 48 x 21 x 12 48 x 21 x 12 48 x 21 x 12 54 x 21 x 12
WATER IN/OUT SIZE OD SWEAT (in.) 1/21/21/23/4
CONDENSATE SIZE ID VINYL (in.) 5/85/85/85/8
ARI/ISO capacity ratings

6
Factory-installed options
Cupronickel heat exchangers are available for higher
corrosion protection for applications such as open tower,
geothermal, etc. Consult the water quality guidelines for
proper application and selection of this option.
Thermostat options include a unit-mounted manual
changeover (MCO) or auto changeover (ACO) thermostat.
The temperature set point knob and pushbutton switches
for fan speed and cool/heat mode (MCO) selection are
conveniently located on the top. The thermostat senses the
return-air temperature. The thermostat sends the appro-
priate signal to the controller for cooling or heating mode
of operation.
Options R and S allow connection to a remote wall-
mounted thermostat. The Complete C controller requires a
heat pump thermostat. The Deluxe D controller can be
configured for heat pump or heat/cool thermostat.
Extended range is provided to insulate the coaxial coil to
prevent condensation, and therefore potential dripping
problems, in applications where the entering water
temperature is below the normal operating range (less than
60 F).
Cabinet options include a locking control panel for
added security. Bottom or front return with left or right
hand configurations are available for ease of installation.
Available with 3 or 5 in. subbase, with or without motor-
ized damper.
Motorized fresh air damper with the unit-mounted
thermostat. Opens when LOW or HIGH fan speed selec-
tions are made from the push button switches. When
STOP or FAN ONLY selections are made the spring return
on the damper motor closes the damper. With remote
thermostat the motorized fresh air damper opens when the
fan is running.
Piping connections can be provided on either the right
or left hand side of the unit, for easy installation. Orienta-
tion is determined by facing the unit from the front side.
Automatic flow regulators include internally mounted
2.25 or 3.0 gpm per ton automatic flow regulating valves
for easier installation.
Two-way motorized control valve can be provided with
a copper or cupronickel heat exchanger for applications
involving open type systems or variable speed pumping.
This valve will slowly open and close in conjunction with the
compressor operation to shut off or turn on water to the
unit. Standard two-way valve performance includes coeffi-
cient of velocity (Cv) of 2.9 and maximum operating pres-
sure differential (MOPD) of 125 psi.
Mute package includes high density noise suppression
material on front, right, and left sides of compressor
compartment and 1/2-in. fiberglass insulation on all
insulated surfaces, for extra-quiet operation in the most
critical applications.
Deluxe D control system provides the same functions
as the Complete C while incorporating additional flexibility
and functions to include:
Thermostat input capabilities — Accommodate emergency
shutdown mode and night setback with override (NSB)
potential. Night setback from low temperature thermostat
with 2-hour override is initiated by a momentary signal
from the thermostat.
Compressor relay staging — Used with dual stage units
(units with 2 compressors and 2 Deluxe D controls) or in
master/slave applications.
Boilerless electric heat control system — Allows automatic
changeover to electric heat at low loop water temperature.
Intelligent reversing valve operation — Minimizes reversing
valve operation for extended life and quiet operation.
Thermostat type select (Y, O or Y, W) — Provides ability to
work and select heat pump or heat/cool thermostats (Y, W).
Reversing valve signal select (O or B) — Provides selection
for heat pump O/B thermostats.
Dehumidistat input — Provides operation of fan control for
dehumidification operation.
Multiple units on one thermostat/wall sensor — Provides
for communication for up to three heat pumps on one
thermostat.
Boilerless changeover temperature — Provides selection of
boilerless changeover temperature set point.
Accessory relays — Allow configuration for multiple appli-
cations including fan and compressor cycling, digital night
setback (NSB), mechanical night setback, water valve oper-
ation, and outside air damper operation.
Night low limit — If the unit operation is turned OFF from
either the push button switches, remote thermostat or the
energy management system, it is possible that the space
temperature could drop uncontrollably. The night low limit
feature, with Deluxe D controller, helps maintain the space
temperature at a level that is the best compromise between
energy consumption and a safe space temperature. A ther-
mostat located near the return air filter activates the blower
and compressor operation when the space temperature
falls below 50 F. When return-air temperature is raised
above 55 F the compressor and blower stop.
Override function — An override function is available for
units operating in occupied/unoccupied mode under the
DESCRIPTION
FACTORY-
INSTALLED
OPTIONS
FIELD-
INSTALLED
ACCESSORIES
Cupronickel Heat Exchangers X
Thermostat Options X
Extended Range X
Cabinet Options X
Motorized Fresh Air Damper X
Piping Connections X
Automatic Flow Regulators X
Two-Way Motorized Control Valve X
Mute Package X
Deluxe D Control System X
PremierLink™ Controller X
LONMark® Compliant Controller X
Aquazone™ Thermostats X
Aquazone System Control Panel X
Fire-Rated Hoses X
Ball Valves X
Y Strainers X
Solenoid Valves X
Hose Kit Assemblies X
Remote Sensors X
PremierLink Accessories X
Options and accessories

7
control of an external timeclock or an energy management
system. A contact closure from the timeclock or energy
management system shorts the NSB and C terminal on the
Deluxe D controller signaling an unoccupied mode.
For units with the unit-mounted thermostat, pressing
override switch (located under control access door) will
override the unoccupied mode and allow the occupied
mode of operation to continue for a period of two hours.
The units with the remote wall-mounted thermostat
require a digital thermostat with the override function. In
unoccupied mode an accessory relay is energized on the
Deluxe D controller. The NO/NC contacts of the relay can
be used as appropriate input to the digital thermostat to
signal occupied/unoccupied mode. The thermostat selects
cooling/heating set points based on occupied/unoccupied
mode.
PremierLink™ controller is compatible with the Carrier
Comfort Network® (CCN) and other building automation
systems (BAS). This control is designed to allow users the
access and ability to change factory-defined settings thus
expanding the function of the standard unit.
LONMark® compliant controller contains the factory-
loaded Aquazone™ water source heat pump application
for an interoperable control solution.
Field-installed accessories
Carrier’s line of Aquazone thermostats (used with
remote thermostat units) are both attractive and multi-
functional, accommodating stand-alone water source heat
pump installations.
Programmable 7-day thermostat offers 2-stage heat,
2-stage cool, auto changeover, 7-day programmable with
copy command, 4 settings per day, fully electronic, 24 vac,
backlit LCD, keypad lockout, no batteries required,
5-minute compressor protection, NEVERLOST™ memory,
3 security levels, temperature display in degrees F or C.
Programmable 7-day light-activated thermostat offers
same features as the 7-day programmable thermostat and
includes occupied comfort settings with lights on, unoccu-
pied energy savings with lights off.
Programmable 7-day flush-mount thermostat offers the
same features as the 7-day programmable thermostat and
includes locking coverplate with tamper proof screws, flush
to wall mount, holiday/vacation programming, set point
limiting, dual point with adjustable deadband, O or B termi-
nal, and optional wall or duct-mounted remote sensor.
Programmable 5-day thermostat offers 2-stage heat,
2-stage cool, auto changeover, 5-minute built-in compres-
sor protection, locking cover included, temperature display
in degrees F or C, keypad lockout, backlit display, 5-1-1
programming, O or B terminal, dual set point with adjust-
able deadband, configurable display, self-prompting pro-
gram, 4 settings per day.
Non-programmable thermostat offers 2 heat stages, 2 cool
stages, auto changeover, 5-minute built in compressor pro-
tection, locking cover included, temperature display in
degrees F or C, keypad lockout, large display, back-lit dis-
play, O or B terminal, dual set point with adjustable dead-
band, backplate with terminals.
Aquazone system control panel includes a pre-
programmed, easy to use, Carrier Comfort Controller set
up for a WSHP system.
• Coordinates, monitors, and controls all WSHP units
and ancillary equipment including cooling towers, boil-
ers, and system pumps.
• 50RLP model nomenclature is used to customize the
panel to control all WSHP system requirements.
• Panel can be ordered to include 2, 4, 6, or 8 stages of
system heat rejection.
• Panel can be ordered to include 2, 4, 6, or 8 stages of
system heat addition.
• Panel can be ordered with unique WSHP zone operation
capabilities for stand alone systems (i.e., non-communicating)
to control 10 or 18 zones of WSHP units.
• Panel can be ordered to control variable frequency cool-
ing tower fan operation.
• System pumping operation can be configured for start/
stop, lead/lag, or variable frequency pump operation.
• Direct digital controls (DDC) compatible using the
Carrier Comfort Network (CCN) and WSHP units utiliz-
ing PremierLink CCN controllers.
Fire-rated hoses are 2 ft long and have a fixed MPT on
one end and a swivel with an adapter on the other end.
Hose kits are provided with both a supply and return hose
and can be either stainless steel or galvanized. Five sizes
are available (1/2, 3/4, 1, 11/4, 11/2in.).
Ball valves (brass body) used for shutoff and balancing
water flow. Available with memory, memory stop, and
pressure temperature ports. UL-listed brass body, ball and
stem type with Teflon* seats and seals. Five sizes are avail-
able (1/2, 3/4, 1, 11/4, 11/2in.).
Y strainers (bronze body) are “Y” type strainers with a
brass cap. Maximum operating pressure rating of
450 psi. Strainer screen made of stainless steel. Available
with blow down valves. Five sizes are available (1/2, 3/4, 1,
11/4, 11/2in.).
Solenoid valves (brass body) offer 3.5 watt coil,
24 volt, 50/60 Hz, 740 amps inrush, .312 amps holding.
Slow operation for quiet system application. Five sizes are
available (1/2, 3/4, 1, 11/4, 11/2in.).
Hose kit assemblies provide all the necessary compo-
nents to hook up a water-side system. Supply hose
includes a ported ball valve with pressure temperature
(P/T) plug ports, flexible stainless steel hose with swivel
and nipple. Return hose includes a ball valve, preset auto-
matic balancing valve (gpm) with two P/T ports, flexible
stainless steel hose with a swivel and nipple, balancing
valve, and low-pressure drop water control valve.
Remote sensors are available for Aquazone flush mount
thermostats. Sensors are available for wall (wired and wire-
less) or duct mounted applications.
PremierLink accessories are available to provide a fully
integrated WSHP DDC system. Accessories include supply
air temperature sensors (with override and/or setpoint
adjustment), communicating room sensors, CO2sensors
(for use in demand control ventilation), and linkage thermo-
stats (to control multiple units from one thermostat).
*Teflon is a trademark of E. I. du Pont de Nemours and Company.

8
Options and accessories (cont)
COOL
HEAT
AUTO
R
5-DAY PROGRAMMABLE/NON-PROGRAMMABLE
AUTO
Pm
COOL
HEAT
Carrier
®
AQUAZONE™ THERMOSTATS
(FOR USE WITH REMOTE THERMOSTAT UNITS)
7-DAY PROGRAMMABLE/LIGHT-ACTIVATED
PROGRAMMABLE 7-DAY PROGRAMMABLE FLUSH MOUNT
PREMIERLINK™ COMMUNICATING CONTROL

9
Dimensions
50PEC09-15 BOTTOM RETURN CABINET DIMENSIONS — RIGHT HAND PIPING
30°
11.5
(292) 4.9
(125)
3.5
(88.9)
*25.9
(658)
DAMPER OPENING*
48.0
(1219)
1.63
(41)
11.75
(298)9.81
(249)
0.59
(15)
21.0
(533)
4.9
(125)
REAR VIEW
Air
Inlet
Discharge
Air
1.56
(40)
3.5
(89)
0.75
(19)
R.H. Pipe &
Electric Area
1.0 (25)
1.0 (25)
4.5
(114)
20.0
(508)
12.0
(305)
10.0
(254)
BOTTOM VIEW
5.0
(127)
16.0
(406)
FRONT VIEW
Control Access Door
AIR INLET AREA
48.0
(1219)
33.5
(851)
1.75
(44.5)
48.0
(1219)
4.9
(99)
SIDE
VIEW
REAR
ACCESS
Filter located inside and at
top of air inlet area. Push
tabs up and back to release
filter for replacement.
*Dimension shown is with 3 in. subbase. Add 2 in. to dimension shown for 5 in. subbase.
NOTES:
1. Dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8313.eps

10
Dimensions (cont)
50PEC18 BOTTOM RETURN CABINET DIMENSIONS — RIGHT HAND PIPING
30°
11.5
(292) 4.9
(125)
3.5
(88.9)
*25.9
(658)
DAMPER OPENING*
54.0
(1372)
1.63
(41)
11.75
(298)9.81
(249)
0.59
(15)
21.0
(533)
4.9
(125)
REAR VIEW
Air
Inlet
Discharge
Air
1.56
(40)
3.5
(89)
0.75
(19)
R.H. Pipe &
Electric Area
1.0 (25)
1.0 (25)
4.5
(114)
20.0
(508)
12.0
(305)
10.0
(254)
BOTTOM VIEW
5.0
(127)
16.0
(406)
FRONT VIEW
Control Access Door
AIR INLET AREA
54.0
(1372)
39.5
(1003)
1.75
(44.5)
54.0
(1372)
4.9
(99)
SIDE
VIEW
REAR
ACCESS
Filter located inside and at
top of air inlet area. Push
tabs up and back to release
filter for replacement.
*Dimension shown is with 3 in. subbase. Add 2 in. to dimension shown for 5 in. subbase.
NOTES:
1. Dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8314

11
50PEC09-15 BOTTOM RETURN CABINET DIMENSIONS — LEFT HAND PIPING
30°
11.5
(292) 4.9
(125)
3.5
(88.9)
*25.9
(658)
DAMPER OPENING*
48.0
(1219)
1.63
(41)
11.75
(298)9.9
(251)
0.59
(15)
21.0
(533)
4.9
(125)
REAR VIEW
Air
Inlet
Discharge
Air
12.0
(305)
BOTTOM VIEW
12.6
(320)
FRONT VIEW
Control Access Door
AIR INLET AREA
48.0
(1219)
33.5
(851)
1.75
(44.5)
48.0
(1219)
1.5
(38)
4.9
(99)
1.56
(40)
3.5
(89)
0.75
(19)
L.H. Pipe &
Electric Area
10.0
(254)
REAR
ACCESS
1(25)
1 (25)
4.5
(114)
20.0
(508)
SIDE
VIEW
Filter located inside and at
top of air inlet area. Push
tab up and back to release
filter for replacement.
*Dimension shown is with 3 in. subbase. Add 2 in. to dimension shown for 5 in. subbase.
NOTES:
1. Dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8315

12
Dimensions (cont)
50PEC18 BOTTOM RETURN CABINET DIMENSIONS — LEFT HAND PIPING
30°
11.5
(292) 4.9
(125)
3.5
(88.9)
*25.9
(658)
DAMPER OPENING*
54.0
(1372)
1.63
(41)
11.75
(298)9.9
(251)
0.59
(15)
21.0
(533)
4.9
(125)
REAR VIEW
Air
Inlet
Discharge
Air
12.0
(305)
BOTTOM VIEW
12.6
(320)
FRONT VIEW
Control Access Door
AIR INLET AREA
54.0
(1372)
39.5
(1003)
1.75
(44.5)
54.0
(1372)
1.5
(38)
4.9
(99)
1.56
(40)
3.5
(89)
0.75
(19)
L.H. Pipe &
Electric Area
10.0
(254)
REAR
ACCESS
1(25)
1 (25)
4.5
(114)
20.0
(508)
SIDE
VIEW
Filter located inside and at
top of air inlet area. Push
tab up and back to release
filter for replacement.
*Dimension shown is with 3 in. subbase. Add 2 in. to dimension shown for 5 in. subbase.
NOTES:
1. Dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8316

13
50PEC09-15 FRONT RETURN CABINET DIMENSIONS — RIGHT HAND PIPING
48.0
30°
3.5
(88.9)
21.0
(533)
21.0
(533)
REAR VIEW
Discharge
Air
REAR
ACCESS
1.0 (25)
1.0 (25)
4.5
(114)
20.0
(508)
12.0
(305)
5.0
(127)
16.0
(406)
FRONT VIEW
Control Access Door
48.0
(1219)
43.7
(1110)
7.9
(201)
21.0
(533)
R.H. Pipe &
Electric Area
(1219)
12.0
(305) BOTTOM VIEW
48.0
(1219)
SIDE
VIEW
Air
Inlet
Filter located behind return
air grille and requiresremoval of
cabinet front for access.
NOTES:
1. All dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8317

14
Dimensions (cont)
50PEC18 FRONT RETURN CABINET DIMENSIONS — RIGHT HAND PIPING
54.0
30°
3.5
(88.9)
21.0
(533)
21.0
(533)
REAR VIEW
Discharge
Air
REAR
ACCESS
1.0 (25)
1.0 (25)
4.5
(114)
20.0
(508)
12.0
(305)
5.0
(127)
16.0
(406)
FRONT VIEW
Control Access Door
54.0
(1372)
48.0
(1219)
7.9
(201)
21.0
(533)
R.H. Pipe &
Electric Area
(1372)
12.0
(305) BOTTOM VIEW
54.0
(1372)
SIDE
VIEW
Air
Inlet
Filter located behind return
air grille and requiresremoval of
cabinet front for access.
NOTES:
1. All dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8318

15
50PEC09-15 FRONT RETURN CABINET DIMENSIONS — LEFT HAND PIPING
48.0
30°
3.5
(88.9)
21.0
(533)
21.0
(533)
REAR VIEW
Discharge
Air
REAR
ACCESS
(114)
12.0
(305)
1.5
(38.1)
12.6
(320)
FRONT VIEW
Control Access Door
48.0
(1219)
43.7
(1110)
7.9
(201)
21.0
(533)
(1219)
12.0
(305)
BOTTOM VIEW
48.0
(1219)
4.5
1(25)
1 (25)
20.0
(508)
L.H. Pipe &
Electric Area
SIDE
VIEW
Air
Inlet
Filter located behind return
air grille and requiresremoval of
cabinet front for access.
NOTES:
1. All dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8319

16
Dimensions (cont)
50PEC18 FRONT RETURN CABINET DIMENSIONS — LEFT HAND PIPING
54.0
30°
3.5
(88.9)
21.0
(533)
21.0
(533)
REAR VIEW
Discharge
Air
REAR
ACCESS
(114)
12.0
(305)
1.5
(38.1)
12.6
(320)
FRONT VIEW
Control Access Door
54.0
(1372)
48.0
(1219)
7.9
(201)
21.0
(533)
(1372)
12.0
(305)
BOTTOM VIEW
54.0
(1372)
4.5
1(25)
1 (25)
20.0
(508)
L.H. Pipe &
Electric Area
SIDE
VIEW
Air
Inlet
Filter located behind return
air grille and requiresremoval of
cabinet front for access.
NOTES:
1. All dimensions are shown in inches. Dimensions in parentheses are in millimeters.
2. Optional autoflow valve, motorized water valve and disconnect box are shown.
a50-8320

17
LEGEND
*For installed dimension, add to dimension shown 2.9 in. with 3 in. subbase and 4.9 in. for 5 in. subbase. NOTES:
1. Dimensions shown are in inches. Dimensions in parentheses are in millimeters. 2. Optional autoflow valve, motorized water valve and disconnect box are shown. 3. Water connection in same location regardless of connection type.
EPT — External Pipe Thread IPT — Internal Pipe Thread
50PEC CHASSIS DIMENSIONS
Power Supply
Water In
Water Out
Blower Deck
Blower Access Panel
Compressor
Access
Panel
Control Box
7.5
(191)
0.87
(22)
3.88
(99) 11.54
(293)
3.43
(87)
*1.94
(49)
*7.06
(179)
*16.66
(423)
30°
3.01
(76)
5.36
(136)
0.75
(19)
0.75
(19)
4.46
(113)
1.84
(47)
20.50
(521)
3.28
(83)
40.98
(1040)
Condensate 5/8" ID Vinyl Hose
Optional Motorized Water Valve
Optional Autoflow Valve
Water Connections 5/8" (15.9 mm)
OD Copper, 1/2" IPT or 1/2" EPT
3.56
(90)
Optional Fused Disconnect Box
(mounted to cabinet
not chassis) Also Available in Non-Fused
1.843
(47)
LEFT HAND CONFIGURATION
a50-8321
RIGHT HAND CONFIGURATION
Power Supply
Water In
Water Out
Blower Deck
Blower Access Panel
Compressor
Access
Panel
Control Box
3.50
(89)
1.93
(49)
40.98
(1041)
4.49
(114) 0.75
(19) 0.75
(19)
20.44
(52)
3.88
(99)
11.54
(293)
*1.94
(49)
*16.66
(423)
*7.06
(179)
30°
0.87
(22)
3.01
(76)
5.36
(136)
Condensate 5/8" ID Vinyl Hose
Optional
Disconnect Box
(mounted to cabinet
not chassis)
Optional
Motorized
Water Valve
Optional
Autoflow
Valve
Water Connections 5/8" (15.9 mm) OD Copper, 1/2" IPT or 1/2" EPT
7.5
(191)
3.42
(87)
3.56
(90)
1.843
(47)
a50-8322

18
Dimensions (cont)
50PEC09-15 PIPING DIMENSIONS
RIGHT HAND CONFIGURATION
LEFT HAND CONFIGURATION
LEGEND
*For installed dimension, add to dimension shown 2.9 in. with 3 in. subbase and 4.9 in. for 5 in. subbase.
NOTE: Dimensions shown are in inches. Dimensions in parentheses are in millimeters.
EPT — External Pipe Thread
IPT — Internal Pipe Thread
Power Supply
Water In
Water Out
Compressor
Access
Panel
Control Box
7.5
(191)
0.87
(22)
3.88
(99) 11.54
(293)
3.43
(87)
*1.94
(49)
*7.06
(179)
*16.66
(423)
30°
3.01
(76)
5.36
(136)
0.75
(19)
4.46
(113)
1.84
(47)
3.28
(83)
Condensate
5/8" ID Vinyl Hose
3.56
(90)
1.843
(47)
a50-8323
Power Supply
Water In
Water Out
Blower Deck
Blower Access Panel
3.50
(89)
1.93
(49)
40.98
(1041)
4.49
(114) 0.75
(19)
3.88
(99)
11.54
(293)
*1.94
(49)
*16.66
(423)
*7.06
(179)
30°
0.87
(22)
3.01
(76)
5.36
(136)
Condensate
5/8" ID Vinyl Hose
7.5
(191)
3.42
(87)
3.56
(90)
1.843
(47)
a50-8324

19
50PEC18 PIPING DIMENSIONS
RIGHT HAND CONFIGURATION
LEFT HAND CONFIGURATION
LEGEND
*For installed dimension, add to dimension shown 2.9 in. with 3 in. subbase and 4.9 in. for 5 in. subbase.
NOTE: Dimensions shown are in inches. Dimensions in parentheses are in millimeters.
EPT — External Pipe Thread
IPT — Internal Pipe Thread
Power Supply
Water In
Water Out
Compressor
Access
Panel
Control Box
7.5
(191)
0.87
(22)
3.88
(99) 11.54
(293)
3.43
(87)
*1.94
(49)
*7.06
(179)
*16.66
(423)
30°
3.01
(76)
5.36
(136)
0.75
(19)
4.46
(113)
1.84
(47)
3.28
(83)
Condensate
5/8" ID Vinyl Hose
3.56
(90)
1.843
(47)
a50-8325
Power Supply
Water In
Water Out
Blower Deck
Blower Access Panel
3.50
(89)
1.93
(49)
46.98
(1193)
4.49
(114) 0.75
(19)
3.88
(99)
11.54
(293)
*1.94
(49)
*16.66
(423)
*7.06
(179)
30°
0.87
(22)
3.01
(76)
5.36
(136)
Condensate
5/8" ID Vinyl Hose
7.5
(191)
3.42
(87)
3.56
(90)
1.843
(47)

20
I Determine the actual cooling and heating
loads at the desired dry bulb and wet bulb
conditions.
Assume cooling load at desired dry bulb 80 F and
wet bulb 66 F conditions are as follows:
Given:
Total Cooling (TC). . . . . . . . . . . . . . .10,750 Btuh
Sensible Cooling (SC) . . . . . . . . . . . . .8,650 Btuh
Entering-Air Temperature db . . . . . . . . . . . . 80 F
Entering-Air Temperature wb . . . . . . . . . . . . .66 F
II Determine the following design parameters.
Determine entering water temperature, water flow
rate (gpm), airflow (cfm), water flow pressure drop
and design wet and dry bulb temperatures. Airflow
cfm should be between 300 and 450 cfm per ton.
For applications using multiple units, the water pres-
sure drop should be kept as close as possible across
units to make water balancing easier. Enter the
50PEC12 Performance Data tables and find the
proper indicated water flow and water temperature.
For example:
Entering Water Temp . . . . . . . . . . . . . . . . . 90 F
Water Flow (Based upon
10 F rise in temp) . . . . . . . . . . . . . . . . . . 3.1 gpm
Airflow Cfm . . . . . . . . . . . . . . . . . . . . . . 396 cfm
III Select a unit based on total cooling and total
sensible cooling conditions. Unit selected
should be closest to but not larger than the
actual cooling load.
Enter tables at the design water flow and water
temperature. Read the total and sensible cooling
capacities.
NOTE: Interpolation is permissible, extrapolation is
not.
For example:
Enter the 50PEC12 Performance Table at design
water flow and water temperature. Read Total
Cooling, Sensible Cooling and Heat of Rejection
capacities:
Total Cooling . . . . . . . . . . . . . . . . . .11,000 Btuh
Sensible Cooling . . . . . . . . . . . . . . . . 9,200 Btuh
Heat of Rejection . . . . . . . . . . . . . . .14,100 Btuh
NOTE: It is quite normal for water source heat
pumps to be selected on cooling capacity only since
the heating output is usually greater than the cooling
capacity. Heating capacity is selected based on
different entering water conditions than cooling
capacity.
IV Determine the correction factors associated
with the variable factors of dry bulb and wet
bulb using the Corrections Factor tables
found in this book.
Using the following formulas to determine the cor-
rection factors of dry bulb and wet bulb:
a) Corrected Total Cooling = tabulated total cooling
x wet bulb correction x airflow correction.
b) Corrected Sensible Cooling = tabulated sensible
cooling x wet/dry bulb correction x airflow
correction
V Determine entering air and airflow correction
using the Corrections Factor tables found in
this book.
The nominal airflow for 50PEC12 is 450 cfm. The
design parameter is 325 cfm.
396/450 = 88% of nominal airflow
Use the 89% row in the Correction Factors —
Airflow table.
The Entering Air Temperature wb is 66 F. Use the
66.2 F row in the Entering Air Correction table.
Using the following formulas to determine the cor-
rection factors of entering air and airflow correction:
Compare the corrected capacities to the load
requirements established in Step I. If the capacities
are within 10% of the load requirements, the equip-
ment is acceptable. It is better to undersize than
oversize as undersizing improves humidity control,
reduces sound levels and extends the life of the
equipment.
VI Water temperature rise calculation and
assessment.
Calculate the water temperature rise and assess the
selection using the following calculation:
For example, using the Corrected Heat of Rejection
from the last step:
If the units selected are not within 10% of the load
calculations, review what effect changing the gpm,
water temperature and/or airflow will have on the
corrected capacities. If the desired capacity cannot
be achieved, select the next larger or smaller unit
and repeat Steps I through VI.
Table Ent Air Airflow Corrected
Corrected
Total Cooling = 11,000 x 0.990 x 0.974 = 10,607
Corrected
Sensible Cooling = 9,200 x 1.030 x 0.974 = 9,230
Corrected
Heat of Rejection = 14,100 x 0.992 x 0.981 = 13,721
Actual Temperature
Rise =Correction of Heat Rejection
gpm x 500
Actual Temperature
Rise =13,721 = 8.9 F
3.1 x 500
Selection procedure (with 50PEC12 example)