Carrier 50RTG User Manual

Rooftop Water Source Heat Pump Units

Installation, Start-Up, and

Service Instructions

TM

50RTG

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . .1,2

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• STORAGE

• PROTECTION

• INSPECT UNIT

Step 3 — Location of Unit . . . . . . . . . . . . . . . . . . . . . . . . 3

Step 4 — Mounting the Unit . . . . . . . . . . . . . . . . . . . . . . 6

Step 5 — Condensate Drain . . . . . . . . . . . . . . . . . . . . . . 6

Step 6 — Piping Connections . . . . . . . . . . . . . . . . . . . . 6

• WATER LOOP APPLICATIONS

• GROUND-WATER APPLICATIONS

• GROUND-LOOP APPLICATIONS

Step 7 — Electrical Wiring. . . . . . . . . . . . . . . . . . . . . . . . 7

• SUPPLY VOLT AGE

• 208-VOLT OPERATION

• BLOWER SELECTION

Step 8 — Low Voltage Wiring. . . . . . . . . . . . . . . . . . . . 14

• THERMOSTAT CONNECTIONS

• WATER FREEZE PROTECTION

• AIR COIL FREEZE PROTECTION

• ACCESSORY CONNECTIONS

• WATER SOLENOID VALVES

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15

System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

FIELD SELECTABLE INPUTS . . . . . . . . . . . . . . . .15,16

C Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

C Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Jumper Settings . . . . . . . . . . . . . . . . . . . . 15

D Control DIP Switches . . . . . . . . . . . . . . . . . . . . . . . 15

D Control Accessory Relay Configurations . . . . . 16

Water Valve (Slow Opening) . . . . . . . . . . . . . . . . . . . 16

Outside Air Damper (OAD) . . . . . . . . . . . . . . . . . . . . 16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-18

Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Scroll Compressor Rotation. . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Cooling Mode . . . . . . . . . . . . . . . . . . . . . 17

Unit Start-Up Heating Mode . . . . . . . . . . . . . . . . . . . . . 17

Flow Regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . . . 18

Ground Coupled, Closed Loop and Plateframe

Heat Exchanger Well Systems . . . . . . . . . . . . . . . . 18

Page

OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Units with Aquazone™ Complete C Control . . . . . 19

Units with Aquazone Deluxe D Control . . . . . . . . . . 19

SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19,20

Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Aquazone Deluxe D Control LED Indicators . . . . . 20

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-22

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Wat er Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Condensate Drain Pans . . . . . . . . . . . . . . . . . . . . . . . . . 21

Refrigerant System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Condensate Drain Cleaning . . . . . . . . . . . . . . . . . . . . . 21

Air Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Condenser Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Checking System Charge . . . . . . . . . . . . . . . . . . . . . . . 22

Refrigerant Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Air Coil Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . 22

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 22-25

Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Control Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . CL-1, CL-2

IMPORTANT: Read the entire instruction manual before
starting installation.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo­nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func­tions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precau­tions in the li terature, t ags and labe ls attached to the uni t, and
other safety precautions that may apply.

Improper installation, adjustment, alteration, service, main­tenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the individ­ual instructions packaged with the kits or accessories when
installing.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4
Ta b 5 a 5 a

PC 111 Catalog No. 535-004 Printed in U.S.A. Form 50R-2SI Pg 1 8-02 Replaces: New

Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and the National Electrical Code (NEC)
for special installation requirements.

Understand the signal words — DANGER, WARNING,
and CAUTION. DANGER identifies the most serious hazards
which will result in severe personal injury or death. WARN­ING signifies hazards that could result in personal injury or
death. CAUTION is used to identify unsafe practices , which
would result in minor personal injury or product and property
damage.

Recognize safety information. This is the safety-alert
symbol ( ). When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.

Electrical shock can cause personal injury or death. Before
installing or servicing system, always turn off main power
to system. There may be more than one disconnect switch.
Turn off accessory heater power if applicable.

GENERAL

This Installati on and Start-Up Instructions liter ature is for
Aquazone™ Rooftop W ater Source Heat Pump systems.

Rooftop Water Source Heat Pumps (WSHP) are single­package outdoor units with electronic controls desi gned for
year-round cooling and heat ing.

IMPORTANT: The installation of water source heat pump
units and all associated components, parts, and accessories
which make up the installation shall be in accordance with
the regulations of ALL authorities having jurisdiction and
MUST conform to all applicable codes. It is the responsi­bility of the installing contractor to determine and comply
with ALL applicable codes and regulations.

INSTALLATION

Step 1 — Check Jobsite —

maintenance instructions are provided with each unit. Before
unit start-up, read all manuals and becom e familiar with the
unit and its operation. Thoroughly check out the system before
operation. Complete the inspections and instructions listed
below to prepare a unit for installation. See Ta ble 1 f or u nit
physical data.

To avoid equipment damage, do not use these units as a
source of heating or cooling during the construction
process. The mechanical components and filters used in
these units quickly becomes clogged with construction
dirt and debris whic h may cause system dam age.

Step 2 — Check Unit —

the jobsite, carefully check the shipment against the bill of
lading. Make sure all units have been received. Inspect the car­ton or crating of each unit, and inspect each unit for damage.
Ensure the shipping company makes proper notation of any
shortages or damage on all copies of the freight bill. Concealed

Installation, operation and

Upon receipt of shipment at

damage not discovered during unloading must be reported to
the shipping company within 15 days of receipt of shipment.

NOTE: It is the responsibility of the purchaser to file all
necessary claims with the shipping company.

1. Verify unit is correct model for entering water tempera­ture of job.

2. Be sure to provide freeze protection for piping, as re­quired. Well water applications are espec ially susceptible
to freezing.

3. Be sure the installation location is isolated from sleeping
areas, private offices and other acoustically sensitive
spaces.

4. Check local codes to be sure a secondary drain pan is not
required under the unit.

5. Be sure unit is mounted at a height sufficient to provide
an adequate slope of the condensate l ines. If an appropri­ate slope cannot be achieved, a field-supplied condensate
pump may be required.

6. Provide sufficient space fo r duct connection.

7. Provide adequate clearance for filter replacement and
drain pan cleaning. Do not allow piping, conduit, etc. to
block filter access.

8. Provide sufficient access to allow maintenance and
servicing of the fan and fan motor, compressor and coils.

9. Provide an unobstructed path to the unit. Space should be
sufficient to allow removal of unit if necessary.

10. Provide ready access to water valves and fittings, and
screwdriver access to unit side panels, discharge collar,
and all electrical connections.

11. Where access to side panels is limited, pre-removal of the
control box side mounting screws may be necessary for
future servicing.

STORA GE — If the equi pment is not installed immediately
upon its arrival at the jobsite, it should be left in its shipping
carton and stored in a clean, dry area of the building or in a
warehouse. Units must be stored in an upright position at all
times. If unit stacking is necessary, stack 50RTG03-10 units a
maximum of 2 high. Do not stack units larger than 50RTG10.
Do not remove any equipment from its shipping package until
it is needed.

PROT ECT ION — Onc e the units are properly positioned on
the jobsite, they must be covered with either a shipping carton,
vinyl film, or an equivalent protective covering. Open ends of
pipes stored on the jobsite must be capped. This precaution is
especially important in areas where painting, plastering, or
spraying of fireproof material, etc. is not yet complete. Foreign
material that is allowed to accumulate within the units can pre­vent proper start-up and necessitate costly clean-up operations.

Before installing any of the system components, be sure to
examine each pipe, fitting, and valve, and remove any dirt or
foreign material found in or on these components.

DO NOT store or install units in corrosive environments or
in locations subject to temperature or humidity extremes
(e.g., attics, garages, rooftops, etc.). Corrosive conditions
and high temperature or humidity can significantly reduce
performance, reliability, and service life. Always move
units in an upright position. Tilting units on their sides may
cause equipment damage.

2

INSP EC T UNIT — To prepare the unit for installation, com­plete the procedures listed below:

1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.

2. Verify that the unit is the correct model for the enteri ng
water temperature of the job.

3. Do not remove the packaging until the unit is ready for
installatio n.

4. Verify that the refrigerant tubing is free of kinks or dents,
and that it does not touch other unit components.

5. Inspect all electrical connections. Be sure connections are
clean and tight at the terminals.

6. Compressors are internally spring-mounted. Compressors
equipped with external spring vibration isolators must
have bolts loosened and shipping clamps removed.

7. Remove any blower support cardboard from inlet of the
blower if present.

8. Locate and verify any accessory kit located in compressor
section.

9. Remove any access panel screws that may be difficult to
remove once unit is installed.

Step 3 — Location of Unit —

The following guide­lines should be considered when choosing a location for
WSHP. Refer to Fig. 1 and 2 for unit dimensional data:

• Provide sufficient space for water, electrical and duct

connections

• Locate unit in an area that allows for easy access and

removal of filter and access panels

• Allow enough space for service personnel to perform

maintenance

Table 1 — Physical Data — Aquazone™ 50RTG03-20 Units

UNIT 50RTG 03 04 05 07 08 10 12 15 20
OPERATING WEIGHT (lb) 735 785 835 880 1080 1125 1175 1770 1960
SHIPPING WEIGHT (lb) 750 800 850 900 1100 1150 1200 1800 2000
REFRIGERANT TO AIR HEAT EXCHANGER

Face Area (sq ft) 5 5 5 7.5 9.3 9.3 10.5 20 20
Rows Deep 233333344
Copper Tube Size (in.)

No. Fins per Inch 12 12 12 12 12 12 12 12 12
REFRIGERANT CHARGE R-22/Ckt (oz) 52 68 86 132 68 86 88 141 160
NUMBER OF CIRCUITS 111122222
BLOWER DATA

Diameter (qty-in.) 1-10 1-10 1-10 1-12 1-15 1-15 1-15 2-15 2-15

Width (in.) 6 6 10 11 11 11 11 11 11
FILTER DATA

Size (in.) 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20 16 x 20

Quantity 4444666106

3

/

3

8

/

3

8

/

3

8

/

3

8

/

3

8

/

3

8

/

3

8

/

8

3

/

8

3

OUTSIDE AIR

OPENING

D

AIR

OUTSIDE

NOTES:

AIR

RETURN

AIR

FLOW

.

8

/

1

AIR

RETURN

1" FPT

CONDENSATE DRAIN

C

TOP

AIR

SUPPLY

and specification of each product at the time of order may be changed with-

out notice.

1. All dimensions are in inches.

2. Carrier works continuously to improve its products. As a result, the design

3. Assembly tolerances ±

9-13/16

VIEW

SIDE

AIR

SUPPLY

VIEW

F

5-13/16

E

DIMENSIONS (in.)

Water

Outside Air

UNITS

50RTG

4

/

3

In/Out (FPT)

Opening Size

ABCDEF

03/04 39.52 43.90 81.00 12.32 4.692 6.614 12.57 x 30.00

PIPE CHASE

4

4

2

/

/

/

1

1

1

ELECTRICAL &

Fig. 1 — 50RTG Dimensional Data

B

FRONT

VIEW

A

05 39.52 43.90 81.00 12.32 4.692 6.614 12.57 x 30.00 1

07 39.52 43.90 81.00 12.32 4.692 6.614 12.57 x 30.00 1

08 45.40 49.90 91.07 16.48 5.692 6.614 18.95 x 36.00 1

10/12 45.40 49.90 91.07 16.48 5.692 6.614 18.95 x 36.00 1

15/20 50.62 88.00 91.07 16.48 4.543 6.566 18.95 x 74.00 2

4

RETURN AIR

TRANSITION

SUPPLY AIR

TRANSITION

E

(TYP)

J

3.000 3.000

(TYP)

REQUIREMENTS

BY CONTRACTOR'S

HEIGHT DETERMINED

K

3-7/8"

TO THE NOTED DIMENSIONS. THIS IS TO ALLOW

CLEARANCE FOR MOUNTING UNIT TO CURB.

F

ROOF DECK/ROOFING

FLASHING

14.00 (REF)

ROOF CURB ASSEMBLY DETAILS

(FIELD SUPPLIED)

TRANSITION DETAIL

G

H

IMPORTANT NOTE: WHEN INSTALLING CURB, FLASHING MUST CONFORM

BASE PAN OF UNIT

CURB WALL

STRUCTURAL SUPPORT

C

B

A

23.000

Fig. 2 — 50RTG Roof Curb Dimensional Data

14-15/16

Return Air Transition Supply Air Transition

DIMENSIONS (in.)

GH J K GH J K

ABCEF

ROOF CURB

50RTGACURBCAAA 35.25 72.25 18.00 1.50 12.50 22.00 16.00 39.25 33.25 27.00 21.00 39.25 33.25

50RTGACURBBAAA 41.25 82.25 21.00 1.50 12.50 25.00 19.00 45.25 39.25 27.00 21.00 45.25 39.25

Return Air

Supply

Air

50RTGACURBAAAA 78.875 82.25 21.00 5.00 9.00 25.00 19.00 82.875 76.875 27.00 21.00 82.875 76.875

2.00 TYP.

14.00 (REF)

5

Step 4 — Mounting the Unit —

For proper opera­tion, units must be mounted on a roof curb as shown in Fig. 3.
Follow these guidelines when installing the roof curb:

1. Set unit on curb.

2. Align unit so that its return and supply air direction match
the return and supply air opening in the roof curb frame.

3. Run both the return and supply loop piping, as well as the
electrical supply line, through the pipe chase provided in
the curb.

Step 5 — Condensate Drain

1. Install a condensate trap at each unit with the top of
the trap positioned below the unit condensate drain
connection.

2. Design the length of the trap (water seal) based on the
amount of positive or negative pressure on the drain pan.
As a rule, 1 in. of trap is required for eac h inch of nega­tive pressure on the unit.

Note that condensate is allowed to drain onto the roof.

Step 6 — Piping Connections —

application, there are 3 types of WSHP piping systems to
choose from: water loop, ground-water and ground loop. Refer
to Piping Section of Carrier System Design Manual for addi­tional information.

All WSHP units use low temperature soldered female pipe
thread fittings for water connections to prevent annealing and
out-of-round leak problems which are typically associated with
high temperature brazed connections. Refer to Table 1 for con­nection sizes. When making piping connections, consider the
following:

• Use a backup wrench when making screw connections to

unit to prevent internal damage to piping.

• Ins ulat ion may b e re quir ed on pipin g t o avoi d co nden sa-

tion in the case where fluid in loop piping operates at

temperatures below dew point of adjacent air.

• Piping systems that contain steel pipes or fittings may

be subject to galvanic corrosion. Dielectric fittings may

be used to isolate the steel parts of the system to avoid

galvanic corrosion.

Depending on the

50 RTG
UNIT

WA TER LOOP APPLICATIONS — Water loop applications
usually include a number of units plumbed to a common pip­ing system. Maintenance to any of these units can introduce air
into the piping system. Therefore, air elimination equipment
comprises a major portion of the mechanical room plumbing.

The flow rate is usually set between 2.25 and 3 gpm per ton
of cooling capacity. For proper maintenance and servicing,
pressure-temperature (P/T) ports are necessary for temperat ure
and flow verification.

In addition to complying with any applicable codes, consid­er the following for system piping:

• Piping systems utilizing water temperatures below

50 F require

1

/2-in. closed cell insulation on all pipi ng

surfaces to eliminate condensation.

• All plastic to me tal threaded fittings should be avoided

due to the potential to leak. Use a flange fitted substitute.

• Teflon tape thread sealant is recommended to minimize

internal fouling of the heat exchanger.

• Use backup wrench. Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• The piping system should be flushed prior to operation to

remove dirt and foreign materials from the system.
GROUND-WATER APPLICATIONS — In addition to com-

plying with any applicable codes, consider the following for
system piping:

• Install shut-off valves for servici ng.

• Install pressure-temperature plugs to measure flow and

temperature.

• Boiler drains and other valves should be connected using

a “T” connector to allow acid flushing for the heat

exchanger.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Use PVC SCH80 or copper piping material.
NOTE: PVC SCH40 should not be used due to system high

pressure and temperature extremes.
Water Supply and Quantity

— Check water supply. Water
supply should be plentiful and of good quality. See Table 2 for
water quality guidelines.

IMPORTANT: Failure to comply with the above required
water quality and quantity limitations and the closed­system application design requirements may cause damage
to the tube-in-tube heat exchanger that is not the responsi­bility of the manufacturer.

GASKET

CURB

Fig. 3 — 50RTG Curb Installation

FLASHING

ROOF

In all applications, the quality of the water circulated
through the heat exchanger must fall within the ranges listed in
the Water Quality Guidelines table. Consult a local water treat­ment firm, independent testing facility, or local water authority
for specific recommendations to maintain water quality within
the published limits.

GROUND-LOO P APPL ICATIONS — Te mp erat ure s b etw een
25 to 110 F and a cooling capacity of 2.25 to 3 gpm of fl ow per
ton is recommended. In addition to complying with any appli­cable codes, consider the following for system piping:

• Piping materials should be limited to only polyethylene

fusion in the buried sections of the loop.

• Galvanized or steel fittings should not be used at any

time due to corrosion.

• All plastic to me tal threaded fittings should be avoided

due to the potential to leak. Use a flange fitted substitute.

• Do not overtighten connections.

• Route piping to avoid service access areas to unit.

• Pressure-temperature (P/T) plugs should be used to mea-

sure flow of pressure drop.

6

Step 7 — Electrical Wiring

To avoid possible injury or death due to electrical shock,
open the power supply disconnect switch and secure it in
an open position during installation.

Use only copper conductors for field-installed electrical
wiring. Unit terminals are not designed to accept other
types of conductors.

All field installed wiring, including the electrical ground,
MUST comply with the National Electrical Code (NEC) as
well as applicable local codes. In addition, all field wiring must
conform to the Class II temperature limitations described in the
NEC.

Refer to unit wiring diagram Fig. 4 for a schematic of the
field connections which must be made by the installing (or
electrical) contractor.

Consult the unit wiring diagram located on the inside of the
compressor access panel to ensure proper electrical hookup.
The installing (or electrical) contractor must make the field
connections when using field-supplied disconnect.

Operating voltage must be the same voltage and phase as
shown in Electrical Data shown in T able 3.

Make all final electrical connections with a length of flexi­ble conduit to minimize vibration and sound transmission to
the building.

SUPPLY VOLTAGE — Operating voltage to unit must be
within voltage range indicated on unit nameplate.

On 3-phase units, voltages under load between phases must
be balanced within 2%. Use the following formula to deter­mine the percentage voltage imbalance:

% Voltage Imbalance

= 100 x
Example: Supply voltage is 460-3-60.

max voltage deviation from average voltage

average voltage

AB = 452 volts
BC = 464 volts
AC = 455 volts

A verage Voltage =

452 + 464 + 455

1371

=

3

3

= 457
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 v

(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v

Maximum deviation is 7 v.
Determine percent voltage imbalance.

% Voltage Imbalance = 100 x

7

457

= 1.53%

This amount of phase imbalance is satisfactory as it is

below the maximum allowable 2%.

Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electri­cal components.

NOTE: If more than 2% voltage imbalance is present, contact
local electric utility.

208-VOLT OPERATION — A ll 208-230 volt units are factory
wired for 208 volts. The transformers may be switched to
230-volt operation (as illustrated on the wiring diagram) by
switching the red (208 volt) wire with t he orange (230 volt)
wire at the L1 terminal.

BLOW E R SEL EC TI O N — All water source heat pumps are
factory set with the appropriate motor and sheave combination
to achieve the desired airflow performance. Performance is
selected by matching the desired performance with the appro­priate region in Tables 4-12. Per the table notes, regions desig­nated by A, B, C and D represent motor drive options.

NOTE: Factory-installed sheaves are field adjustable. Refer to
T ables 4-12 for adjustment points.

Table 2 — Water Quality Guidelines

CONDITION ACCEPTABLE LEVEL
pH
Total Hardness
Iron Oxides
Iron Bacteria
Corrosion*

Brackish

*If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious corrosion

problems exists.

†Sulfides in the water quickly oxidize when exposed to air, requiring that no agitation occur as the sample is taken.

Unless tested immediately at the site, the sample will require stabilization with a few drops of one Molar zinc acetate
solution, allowing accurate sulfide determination up to 24 hours after sampling. A low pH and high alkalinity cause sys­tem problems, even when both values are within ranges shown. The term pH refers to the acidity, basicity, or neutrality
of the water supply. Below 7.0, the water is considered to be acidic. Above 7.0, water is considered to be basic. Neutral
water contains a pH of 7.0.

NOTE: To conver t ppm to grains per gallon, divide by 17. Hardness in mg/l is equivalent to ppm.

7 to 9 range for copper. Cupro-nickel may be used in the 5 to 9 range.
Calcium and magnesium carbonate should not exceed 20 grains per gallon (350 ppm).
Less than 1 ppm.
No level allowable.

Ammonia, Ammonium Hydroxide 0.5 ppm Cu
Ammonium Chloride, Ammonium Nitrate 0.5 ppm Cu
Ammonium Sulfate 0.5 ppm Cu
Chlorine/Chlorides 0.5 ppm CuNi
Hydrogen Sulfide† None Allowable —

Use Cupro-nickel heat exchanger when concentrations of calcium or sodium chloride are greater
than 125 ppm are present. (Seawater is approximately 25,000 ppm.)

Max Allowable Level Coaxial Metal

7

50RTG03-07 WITH ECONOMIZER AND COMPLETE C CONTROLLER

Ground

24V

L1

L2

L3

SEE
NOTE 7

BLU

CB

C

YEL

R

Y

P1

Y

W

O

G

R

C

AL1
AL2

A

GRY

Alarm
Relay

BR

Disconnect

OR
CB

(Optional)

GRY

BC

BRG

Test Pins

FP1
FP2

JW1

SEE NOTE 6

Power Supply

Refer to Data Plate

Use copper conductors only.

RED
(208V)

VIO or
BLK/RED

(460V)

BLU

or

BLK

SEE

NOTE 3

ORG

230V

Compressor

Y

Cooling

O

Fan

G

24 V A C

R

Common

C

Alarm

L

Typical T-stat

SEE NOTE 5

LEGEND

AL — Alarm Relay Contacts
BC — Blower Mtr Contactor
CB — Circuit Breaker
CC — Compressor Contactor
ECR — Economizer Relay
EH1 — Auxiliary Heat Stage 1
EH2 — Auxiliary Heat Stage 2
ES — Enthalpy Sensor
FP1 — Sensor, Water Coil Freeze Protection
FP2 — Sensor, Air Coil Freeze Protection
HP — High Pressure Switch
JW1 — Jumper, Alarm Mode
LAR — Low Ambient Relay
LOC — Loss-of-Charge Pressure Switch
MAS — Mixed Air Sensor
NEC — National Electrical Code
OAT — Outside Air Thermostat

BRN

SEE
NOTE 4

BLK

BLK

BLK

4

CCG

LAR

BRN

Compressor
Relay

Dip Switch

Off On

L1

L2

L3

Power

Distribution

Block

3

CC

PM

1
2

Not Used

Status

G

LED

YEL

C

Microprocessor

Control Logic

PM — Performance Monitor
P1 — Field Wiring Terminal Block
RVS — Reversing Valve Solenoid

Relay Contactor Coil

Solenoid Coil

Thermistor

Ground

Field Line Voltage Wiring

Field Low Voltage Wiring

Printed Circuit Trace

HP

LOC

FP1

FP2

RV

CO

CO

24V
DC

EH1
EH2

BLK

BLK

BLK

BLK

BLK

BLK

P2

P3

1

2
3

4
5

6
7

8
9

10

12

SEE
NOTE 7

Not Used

115V / 1PH

L1

BLK

L2

BLK

L3

BLK

CC

BLK

BLK

BLK

BC

BRN

VIO

BRN

TR1

TR S

RED
RED
BLU
BRN
GRY
GRY
VIO
VIO
BRN
ORG

T1

T2

T3

Compressor

Blower Motor

ES

-

+

+

4

YEL

8

NOTES:

1. Compressor and blower motor thermally protected
internally.

2. All wiring to the unit must comply with NEC and
local codes.

3. 208/230 v transformers will be connected for
208 v operations. For 230 v operations, discon­nect Red lead at L1, and attach Orange lead to
L1. Close open end of Red Lead with insulating
tape.

4. FP1 jumper provides freeze protection for
WATER. When using ANTI-FREEZE solutions, cut
FP1 jumper.

5. Typical ther mostat wiring shown. Refer to thermo­stat Installation Instructions for wiring to the unit.

6. 24 v alarm signal shown. For dry alarm contact,
cut JW1 jumper and dry contact will be available
between AL1 and AL2.

7. Transformer secondary ground via Complete C
board standoffs and screws to control box.
(Ground available from top two standoffs as
shown.)

Logic Module

(Damper Actuator)

BLUGRY

600 150

Ohm Ohm

+2

5

S

RO

2

BLK

YEL

3

YEL

6

OAT

R

7

WHT TAN

ECR

BRN

HP

LOC

FP1

FP2

RVS

BRN

ECR

WHT
GRN

Field

BLK

Wiring

GFI

(Optional)

MAS

GRY BRN

134TT1P

CC

B

BRN

LAR

ORG

P1

Fig. 4 — Typical Aquazone™ Complete C Control Wiring

8

Table 3 — 50RTG Electrical Data

UNIT

50RTG

03

04

05

07

08

10

12

15

20

LEGEND

FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA — Lock Rotor Amps
RLA — Rated Load Amps

NOTE: Contact factory for oversize blower motor electrical data.

POWER
SUPPLY

Voltage Hz Ph RLA LRA QTY HP FLA QTY

208/230 60 3 10.7 63.0 1 1 3.6 1 25 Amp 17.0

460 60 3 5.0 31.0 1 1 1.8 1 15 Amp 8.1

208/230 60 3 13.9 88.0 1 1 3.6 1 30 Amp 21.0

460 60 3 6.4 44.0 1 1 1.8 1 15 Amp 9.8
575 60 3 5.3 34.0 1 1 1.6 1 15 Amp 8.2

208/230 60 3 20.0 123.0 1 1 3.6 1 45 Amp 28.6

460 60 3 7.5 49.5 1 1 1.8 1 15 Amp 11.2
575 60 3 6.4 40.0 1 1 1.6 1 15 Amp 9.6

208/230 60 3 20.7 156.0 1 2 6.2 1 50 Amp 32.1

460 60 3 10.0 70.0 1 2 3.1 1 25 Amp 15.6
575 60 3 8.2 54.0 1 2 2.3 1 20 Amp 12.6

208/230 60 3 13.9 88.0 2 2 6.2 1 50 Amp 37.5

460 60 3 6.4 44.0 2 2 3.1 1 20 Amp 17.5
575 60 3 5.3 34.0 2 2 2.3 1 15 Amp 14.2

208/230 60 3 20.0 123.0 2 2 6.2 1 70 Amp 51.2

460 60 3 7.5 49.5 2 2 3.1 1 25 Amp 20.0
575 60 3 6.4 40.0 2 2 2.3 1 20 Amp 16.7

208/230 60 3 19.3 123.0 2 3 9.2 1 70 Amp 52.6

460 60 3 10.0 62.0 2 3 4.3 1 35 Amp 26.8
575 60 3 7.8 50.0 2 3 3.4 1 25 Amp 21.0

208/230 60 3 20.7 156.0 2 3 9.2 1 70 Amp 55.8

460 60 3 10.0 70.0 2 3 4.3 1 35 Amp 26.8
575 60 3 8.2 54.0 2 3 3.4 1 30 Amp 21.9

208/230 60 3 33.3 232.0 2 5 13.2 1 125 Amp 88.1

460 60 3 17.0 116.0 2 5 6.6 1 60 Amp 44.9
575 60 3 12.8 97.0 2 5 5.6 1 45 Amp 34.4

COMPRESSOR

(each)

BLOWER

MOTOR

MAX. FUSE

OR HACR

BREAKER

MINIMUM

CIRCUIT

AMPACITY

Table 4 — 50RTG03 Blower Performance

SCFM

AIRFLOW

975

1050

1125

1200

1275

1350

1425

LEGEND

BHP — Brake Horsepower
SCFM — Standard Cubic Feet Per Minute

NOTES:

1. Fan BHP includes drive losses.

2. Region “A” is standard drive package.

3. Regions “B” and “C” require optional drive packages.

4. For applications requiring higher static pressures, contact your local representative.

BHP 0.12 0.14 0.17 0.19 0.21 0.23 0.26 0.29 0.31 0.33

RPM 550 609 667 724 779 833 885 933 980 1024

Turns Out 5.0 3.5 4.5 3.5 2.5 1.5 1.0 0.0 2.0 1.5

BHP 0.14 0.17 0.19 0.22 0.24 0.26 0.30 0.32 0.35 0.37

RPM 580 636 691 745 798 849 898 946 991 1035

Turns Out 4.0 3.0 4.0 3.0 2.5 1.5 0.5 0.0 2.0 1.5

BHP 0.18 0.20 0.23 0.25 0.28 0.31 0.33 0.36 0.39 0.42

RPM 619 670 721 772 821 870 917 963 1008 1051

Turns Out 3.5 4.5 3.5 3.0 2.0 1.0 0.5 2.5 2.0 1.0

BHP 0.22 0.24 0.26 0.29 0.32 0.35 0.37 0.41 0.44 0.46

RPM 658 705 752 799 846 892 937 982 1025 1066

Turns Out 4.5 4.00 3.00 2.5 1.5 1.0 0.0 2.0 1.5 1.0

BHP 0.26 0.29 0.31 0.33 0.36 0.40 0.42 0.45 0.48 0.52

RPM 688 732 777 822 867 911 954 997 1038 1079

Turns Out 4.0 3.5 2.5 2.0 1.5 0.5 2.5 2.0 1.5 1.0

BHP 0.29 0.32 0.35 0.39 0.41 0.44 0.47 0.51 0.54 0.57

RPM 721 764 807 850 893 935 976 1017 1057 1096

Turns Out 3.5 3.0 2.5 1.5 1.0 0.0 2.0 1.4 1.0 0.5

BHP 0.4 0.40 0.42 0.44 0.46 0.50 0.53 0.56 0.61 0.64

RPM 763 803 843 883 923 963 1003 1041 1080 1118

Turns Out 3.0 2.5 1.5 1.0 0.5 2.5 2.0 1.5 1.0 0.5

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

B

EXTERNAL STATIC PRESSURE (in. wg)

A

C

9