CARRIER Air Conditioner/heat Pump(outside Unit) Manual L1001423

User Manual: CARRIER CARRIER Air conditioner/heat pump(outside unit) Manual CARRIER Air conditioner/heat pump(outside unit) Owner's Manual, CARRIER Air conditioner/heat pump(outside unit) installation guides

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AQUAZONE TM
50VS
Vertical Stack Water Source Heat Pump
with PURON® (R-410A) Refrigerant

Installation, Start-Up, and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS
.........................
GENERAL ...........................................

Page
1
1

INSTALLATION
...................................
2-17
Step 1 -- Check Jobsite .............................
2
Step 2 -- Check Unit .................................
8
• STORAGE
• PROTECTION
• INSPECT UNIT
Step 3 -- Locate Unit ................................
8
Step 4 -- Install Drywall .............................
8
Step 5 -- Install Cabinet and Riser ...................
8
• SYSTEM PIPING ARRANGEMENTS
• RISER MATERIAL, SIZING AND INSTALLATION
• RISER EXPANSION
• RISER CONNECTIONS
• COMMERCIAL WATER LOOP APPLICATION
• GROUND-LOOP
HEAT PUMP APPLICATION
• OPEN-LOOP GROUND WATER SYSTEMS
Step 6 -- Wire Field Power Supply Connections
.... 13
• ELECTRICAL-LINE
VOLTAGE
• POWER CONNECTION
• 208/230-VOLT OPERATION
Step 7 -- Wire Field Control Connections
..........
15
Step 8 -- Clean and Flush System ..................
15
Step 9 -- Install Hose Kit ...........................
15
Step 10Install Chassis into the Cabinet .........
16
Step 11 -- Install Return Panel .....................
16
Step 12Install Supply Grille .....................
17
PRE-START-UP ..................................
17,18
System Checkout ...................................
18
FIELD SELECTABLE
INPUTS ....................
18,19
DIP Switch Settings and Operation
.................
18
Standard 24-vac Sequence of Operation ............
19
START-UP .......................................
19,20
Operating
Limits ....................................
20
Lockout Mode ......................................
20
SERVICE ...........................................
Water Coil Maintenance
............................
Filters ..............................................
Condensate
Drain ..................................
Compressor
........................................
Fan Motors .........................................
Evaporator
Coil .....................................
Cabinet .............................................
Refrigerant
System .................................
TROUBLESHOOTING
............................
Lockout Modes .....................................
START-UP

CHECKLIST

.......................

IMPORTANT:
starting
installation.
Read the entire instruction

SAFETY
be

21
21
21
21
21
21
21
21
21
21,22
21
CL1,CL2

manual

before

CONSIDERATIONS

Installation and servicing of air-conditioning
hazardous
due to system
pressure

equipment can
and electrical

components.
Only trained and qualified service personnel
should install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions such as 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 literature, tags and labels attached to the unit,
and other safety precautions that may apply.
hnproper 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 a local
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.
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 (AX). When this symbol is displayed 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 installation and start-up instructions
Aquazone TM water source heat pump systems.

literature

is for

The 50VS water source heat pump (WSHP) is a vertically
stacked unit with electronic controls designed for year-round
cooling and heating.
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.

Manufacturer reserves the right to discontinue, or change at any time, specifications
Catalog No. 04-53500046-01
Printed in U.S.A.
Form 50VS-1SI

or designs without notice and without incurring obligations.
Pg 1
10-08
Replaces: New

INSTALLATION

The 50VS units are designed for indoor installations. Units
are typically installed in a floor-level closet or a small mechanical room. Be sure to allow adequate space around the unit for
servicing. See Fig. 1-5 for unit dimensions.

Step 1 E Check Jobsite E Installation, operation and
maintenance instructions are provided with each unit. Before
unit start-up, read all manuals and become 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 Table 1 for unit
physical data.

To avoid equipment damage, do not use 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
which may cause system damage.

IMPORTANT:
This equipment
is designed for indoor
installation
ONLY. Extreme variations
in temperature,
humidity and corrosive water or air will adversely affect
the unit performance, reliability and service life.

Table 1 -- Physical Data -- 50VS Unit

COOLING CAPACITY

UNIT

50VSA,B

50VSC,D

50VSE,F

50VSG,H

50VSI,J

50VSK,L

50VSM,N

(Btuh)

9,200

11,700

16,500

18,000

22,500

28,500

32,700

12,500

16,000

22,500

24,500

31,000

38,000
170

45,000

HEATING
CABINET

CAPACITY (Btuh)
WEIGHT (Ib)

CHASSIS

WEIGHT (Ib)

120

105

119

COMPRESSOR (1 each)
High Side Pressure (psig)

R-410A

Airflow (cfm)

(oz)

27.5

36.7

41.6

49.4

63.5

61.8

7.08
]

6.69

450

9.21

540

640

x 9.99

820

1120

1300

6.5

8.5

9.5

4.8

7.2

10.2

1.48

1.81

1.48

SIDE DATA

Flow Rate (gpm)

2.6
Size (FPT) (in.)

Water Side Pressure
Condensate

Scroll

(in. wg)

Water Connection

205

198

PSC/2 speed

370

WATER/CONDENSATE

]

170

CHARGE

Fan Motor Type/Speeds
Blower Wheel Size (Depth x Width) (in.)
Std/High Static
Static Pressure

187

550

Low Side Pressure (psig)
FACTORY REFRIGERANT
FAN DATA

122

Rotary

Drop (psi)

Connection

5.8

]
1/2

3.2

]

5.8

4.5

5.2

3/4
11.5

11.8
3/4

Size (in.)

AIR COIL DATA
Total Face Area (sq ft)

1.48

Tube Size (in.)
Fin Spacing (FPI)
Number of Rows
CABINET

12
2

1.81

1.48
3/8

DATA

Depth (in.)

Height (in.)

Width (in.)
Standard Filter -- 1 in. Washable

LEGEND
FPI
PSC

---

Fins Per Inch
Permanent Split Capacitor

14-1/4 x 18-1/2

24
14-1/4 x 22-1/2

19 x 28-3/4

2 1/2"

DIMENSION A
(in.)

WATER
CONNECTION
SIZE (FPT) (in.)

50VSA,B

1/2

50VSC,D

1/2

50VSE, F

3/4

50VSG,H

3/4

50VSI,J

241/4

3/4

50VS K, L

241/4

3/4

50VSM,N

241/4

3/4

UNIT

0
o

0
0

COIL
CONNECTION
SIZE (in.)

SWAG E

SUPPLY

6 1/8"
13

13/16"

GRILLE

OPTIONAL 24V
THERMOSTAT
LOCATION

2 3/8"

21/4"

CONTROL
ACCESS

' FILTER

BOX

104" to 115"

REGULATOR

FLOW
LOCATION

FACTORY-INSTALLED
SUPPLY AND RETURN
FEEDERS WITH BALL
VALVES

f
55 1/2"
65 1/4"

HOSE KITS

I
RETURN

PUMPCHASSIS

AIR COIL
DRAIN
-3--

PAN
ACOUSTICAL

FACTORY
5 5/8"

RISER
TAILPIECE

Fig. 1 -- 50VS Unit Dimensional Data

P-TRAP

5/8-in.

I
I

2_in.

DIMENSIONAL

DATA

Grille Size (in.)

Cabinet
Height

W (in.)

H (in.)

A (in.)

B (in.)

C (in.)

16 x 14

STD

157/16

137/16

14 x 12

STD

133/8

113/8

12 x 10

STD

117/16

10x8

STD

97/16

NOTES:
1. Single deflection grilles include adjustable vertical blades for controlling horizontal path of discharge.
2. Double deflection grilles include adjustable vertical and horizontal blades for controlling horizontal and vertical path of
discharge air (recommended).
3. Dimensions are in inches.
4. All dimensions are 4- 1/4 inch.
5. Discharge grilles are shipped loose for field installation.
6. Construction is roll formed aluminum frame and blades.
7. Standard finish is powder coated and will be the same color as the return grille.
8. Installation of grille on adjacent unit sides may require a duct extension to prevent air bypass around discharge grilles.
9. Mounting hardware included.

Fig. 2 -- Single and Double Deflection Aluminum Discharge Grille

5/8"

--O

1
\
I

' I

DIMENSIONAL

3 1/8"

DATA

Grille Size (in.)

Cabinet
Height

W (in.)

H (in.)

A (in.)

B (in.)

16 x 14

STD

153/16

133/16

173/4

14 x 12

STD

133/16

113/16

153/4

12 x 10

STD

113/16

93/16

10x8

STD

93/16

73/16

C (in.)

D (in.)

153/4

N/A

47/8

133/4

67/8

N/A

133/4

113/4

57/8

N/A

113/4

93/4

47/8

N/A

NOTES:
1. The opposed blade damper allows control of air volume (cfm) and path of discharge air. Recommended for applications requiring unequal airflow or side discharge grille(s) with additional top discharge air opening.
2. Dimensions are in inches.
3. All dimensions are 4- 1/4 inch.
4. Discharge grilles are shipped loose for field installation.
5. Construction is roll formed aluminum frame and blades.
6. Standard finish is powder coated and will be the same color as the return grille.
7. Installation of grille on adjacent unit sides may require a duct extension to prevent air bypass around discharge grilles.
8. Mounting hardware included.

Fig. 3 -- Double Deflection with Opposed Damper Aluminum Discharge Grille

STANDARD PERIMETER BYPASS
ALLEN LOCK, REMOVABLE

OPTIONAL PERIMETER
BYPASS ALLEN LOCK OR
KEY LOCK, HINGED

OPTIONAL LOUVERED
ALLEN LOCK, REMOVABLE

2.95

21.13
26.28

24.19

55L.35

63.15

58.00

'r
r

17.68
2.38

30.38*

] .......................................
_
*ROUGH-IN

STANDARD PERIMETER BYPASS
ALLEN LOCK, REMOVABLE

NOTE: All dimensions

OPENING

PLUS

1/4-in.

OPTIONAL PERIMETER
BYPASS ALLEN LOCK OR
KEY LOCK, HINGED

OPTIONAL LOUVERED
ALLEN LOCK, REMOVABLE

are in inches.

Fig. 4 -- Return Panel and Frame Dimensions -- 50VSA-VSH Units

STANDARD PERIMETER BYPASS
ALLEN LOCK, REMOVABLE

OPTIONAL PERIMETER
BYPASS ALLEN LOCK OR
KEY LOCK, HINGED

OPTIONAL LOUVERED
ALLEN LOCK, REMOVABLE

32.28
2.95

27.13

30.19

58.75

63.90

61.86
|

24.91

m
|

19.68

2.38

2438.
STANDARD PERIMETER BYPASS
ALLEN LOCK, REMOVABLE

* ROUGH-IN

OPENING

PLUS

1/4-in.

OPTIONAL PERIMETER
BYPASS ALLEN LOCK OR
KEY LOCK, HINGED

OPTIONAL LOUVERED
ALLEN LOCK, REMOVABLE

NOTE: All dimensions are in inches,

Fig. 5 -- Return Panel and Frame Dimensions -- 50VSI-VSN Units

Step 2 -- Check Unit

-- Upon receipt of shipment at
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
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
necessary claims with the shipping company.

to file all

1. Be sure that the location chosen for unit installation provides ambient temperatures maintained above freezing.
Well water applications
are especially
susceptible to
freezing.
2.

Be sure the installation
areas, private offices
spaces.

DO NOT store or install units in corrosive enviromnents 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.
INSPECT UNIT -- To prepare the unit for installation,
plete the procedures listed below:

com-

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

location is isolated from sleeping
and other acoustically
sensitive

NOTE: A sound control accessory package may be used
to help eliminate sound in sensitive spaces.

Do not remove
installation.

Check local codes to be sure a secondary
required under the unit.

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

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

Inspect all electrical connections. Be sure connections
clean and tight at their terminations.

Remove
blower.

drain pan is not

the packaging

any blower support

until the unit is ready for

cardboard

are

from inlet of the

Provide sufficient space for duct connection.
Do not
allow the weight of the ductwork to rest on the unit.

Locate and verify any accessory kit located in compressor
and/or blower section.

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

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

Provide sufficient access to allow maintenance
and
servicing of the fan and fan motor, compressor and coils.
Removal of the entire unit from the closet should not be
necessary.

Provide an unobstructed path to the unit within the closet
or mechanical room. Space should be sufficient to allow
removal of unit if necessary.

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

10.

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

STORAGE -- If the equipment is not needed ilmnediately 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 carton stacking is
necessary, stack units a maximum of 3 cartons high. Do not remove any equipment from its shipping package until it is needed for installation.
PROTECTION -- Once the units are properly positioned on
the jobsite, cover them with either a shipping carton, vinyl fihn,
or an equivalent protective covering. Cap open ends of pipes
stored on the jobsite. This precaution is especially flnportant in
areas where painting, plastering, or spraying of fireproof lnaterial, etc. is not yet complete. Foreign material that accumulates
within the units can prevent proper start-up and necessitate
costly clean-up operations.
Before installing any of the system components,
examine each pipe, fitting, and valve, and remove
foreign material found in or on these components.

be sure to
any dirt or

Step

3 _

Locate

Unit _

should be considered

The

when choosing

following

guidelines

a location for a WSHP:

•

Units are for indoor use only.

•

Locate in areas where ambient temperatures are between
39 F and 102 F and relative humidity is no greater than
75%.
Provide sufficient
connections.

space

for water,

electrical

and

duct

Locate unit in an area that allows easy access and removal
of filter and access panels.
Allow enough
maintenance.

space

for service

personnel

to perform

Return air must be able to freely enter the space if unit needs
to be installed in a confined area such as a closet.

Step 4 _ Install Drywall _ All rough-in instructions
and drawings ar e designed for a single layer of 5/s in- thick drywall. Refer to Fig. 6. Rough-in dimensions will be affected if
drywall thickness is different than 5/8 in., the return panel will
not fit snugly to the wall and form a tight seal. Install drywall
using conventional
construction methods. Drywall cannot be
fastened to the studs with adhesive alone; a mechanical fastener such as drywall screws must be used.
Vacuum all drywall dust and construction debris from coils,
drain pans and blower discharge plenum after cutting out supply and return holes for grilles. When installation is complete,
cover cabinet supply and return air openings.
Do not allow paint or wall texture over-spray to contact coil,
fan or other unit components. Warranties are void if paint or
other foreign debris is allowed to contaminate internal unit
components.

Step 5 -- Install Cabinet

and Riser

SYSTEM PIPING ARRANGEMENTS -- Figure 7 shows
some of the colmnon piping layouts for water source heat
pumps. 2-pipe systems are depicted but the same methods can
be applied to 4-pipe systems.

The direct return system shows the most common piping arrangement. This is the most cost effective method of piping to
install since the water is supplied and returned to a riser column
at the same place, at the bottom or top of the building. However, this type of system requires more effort to individually balance water flow to the units. The risers are normally capped at
the ends opposite the main supply and return piping and may
require a field-installed flush and vent loop.
The first reverse return system shows a system, which is
commonly used to minimize individual unit water flow balancing and is often referred to as "self balancing." This riser arrangement has a natural affinity to balance the flow to each unit
in the riser column. However, individual unit balancing may
still be required. This piping system is used on 2-pipe systems
only and has an individual return for each riser column.
The second reverse return system shows a system with a
common reverse return riser installed separately from the
individual unit riser columns. This riser arrangement allows for
more flexibility in individual unit riser sizing but has the same
general characteristics as the "reverse return" system described
above. It may also be a better fit for the particular structural and
architectural requirements of the building. This piping system
may also be used on 4-pipe systems.
Regardless of the system selected, optimum performance
can only be achieved through adjustlnent to the recommended
water flow at each individual unit (see Table 1 for individual
unit water flow requirements).
RISER MATERIAL,
SIZING, AND INSULATION
-Some of the factors affecting riser application and sizing are
noise, tube erosion and economics. Water source heat pumps
maybe supplied with factory-installed risers; the riser material,
diameter, length and insulation thickness must be determined
for each unit based on its positioning within the building.
Figure 8 displays riser robe diameter sizes as a function of flow
(gpm), friction loss and water velocity. For maxilnum riser
velocity on pressure drop per 100 ft, refer to ASHRAE (American Society of Heating, Refrigeration,
and Air Conditioning

Engineers) Fundamentals
Handbook for Riser Sizing. Generally, riser copper type, size, length and insulation thickness are
determined by the location of the water source heat pump unit
in the building. Chilled water and hot water risers are available
in Type-M, Type-L copper, varying diameters from 3/4 to
21/2 in., and with either no insulation, 1/2 or 3/4 in. thick closed
cell foam insulation. Condensate risers are available in Type-M
copper, varying diameters from 3/4 to 11/4 in., and with no
insulation, 1/2 or 3/4 in. thick closed cell foam insulation. All
factory-supplied risers and riser extensions are insulated for the
full length of the riser, eliminating the need for field insulation.
Insulation is not required on loop water piping except where
the piping runs through unheated areas, outside the building or
when the loop water temperature
is below the minimum
expected dew point of the pipe ambient conditions. Insulation
is required if loop water temperature drops below the dew
point (insulation is required for the ground loop applications in
most clilnates).
Riser sizing is generally based on the water flow requirements of each unit and the units on higher and lower floors that
tie into the same riser column depending on the piping system
chosen. Water piping is often designed at approximately 5 ft/s.
Keeping this in mind, risers can be reduced in size as the water
flow decreases froln floor to floor. For low-rise buildings, riser
sizes can be of a single diameter.
The reduced material handling on site will often offset the
extra costs associated with the larger risers.
RISER EXPANSIONGenerally, in medium to high-rise
buildings, allowances must be made for pipe expansion. In applications supplemented
with factory (or field) supplied between the floor riser extensions, assemble and install extensions before installing cabinet.
NOTE: Riser assemblies
are designed to accommodate
a
maximum of 11/8 in. expansion and contraction up to a total
movement of 21/4 inches. If the total calculated rise expansion
exceeds 21/4 in., expansion
devices must be used (field
provided).

50VS

UNIT

DIMENSIONS

SIZE

(in.)

245/8

3011/16

245/8

6311/16

50VSI-VSN

307/8

3611/16

305/8

647/18

EXISTING

WALL

fA_
RISERS

RETURNDRAINSUPPLY-

\RETURN

PANEL

\
\_

DRYWALL

TOP VIEW
DRYWALL
EXISTING

WALL

STUD _4__.f]

_
"_[_

UNIT CABINET

j_\

DETAIL A

Fig. 6 -- Framing Rough-In Detail

50VSA-VSH

1 11/16in.

MIN

FRAME
FASTENERS

BY OTHERS

_ RETGAsKETURNPANEL

DIRECT
Flush/Vent

Loop

RETURN
Capped

Roof

REVERSE

RETURN

REVERSE RETURN
WiTH A COMMON REVERSE
RETURN RISER

Risers

Roof

¢
•4

3rd Floor

=1
=i

3rd Floor

i
i

2nd Floor

2rid Floor
k

I st Floor

R--

s ===e,

=!
-1

|
i

• •

1st Floor

tgR

Mains

Basement

Fig. 7 -- System Piping Arrangements
All riser modifications necessitated by variations in flooPtofloor dimensions including cutting off or extending risers is the
sole responsibility of the installing contractor.
Additional expansion compensation
must be made in the
riser system in the field where movement is expected to exceed
the factory allowances. Figure 9 displays the expansion characteristics of risers compared to water temperature differential.
Assuming
a lninimum
water temperature
of 20 F and a
maxilnum water temperature of 120 K the temperature difference of 100 F indicates 90 feet of riser will expand or contract
1 inch. To eliminate stress, a riser system must be anchored at
least once to the building structure. Technical information on
pipe expansion, contraction and anchoring can be found in the
ASHRAE HVAC Systems and Equipment Handbook and various other technical publications. Riser expansion and the anchoring of each unit is the responsibility of the design engineer
and installing contractor.
RISER CONNECTIONSInstall cabinet with risers as
follows:

_E
"5
ft.
g

3.0

4.0

1o
9.0
8.0
7.0
6.o

5.06.07.08.0

I /I

I',...,_

T-

5.0

......

3.0

["-

1 6"s

-.._/ I 17"42,
80

5 ft

/'f'-4d

"_-

lit

N4'_s

2.0

=
O..

1.o ,
3.0

40 5todbrbso 10

1.0

Water

Flow

30 40 50 507080100

Rate - GPM

Fig. 8 -- Friction Loss of Risers

550

Keep risers off the floor while moving the cabinet. Failure
to heed this warning could result in equipment damage.

500
i

Be sure that all the copper fittings are clean and flee of
dirt. Raise the cabinet upright and lower it into the riser
from the floor below.

X_. 400
W

Center risers in the pipe chase and shim the cabinet level.
Plumb risers in two planes to assure proper unit operation
and condensate drainage.

350

'
T-

300

280

,..=
200

Attach the cabinet assembly to the floor and the building
structure on at least two sides using sheet metal angles
(field provided). A field-provided base vibration dampening pad can be used to help eliminate transfer of any vibration to the structure. If vibration dampening pads are
used some rough-in dimensional changes will need to be
considered before installation due to style and thickness
of the pads. Additional anchorage can be provided by installing brackets at the top of the cabinet (field provided).
DO NOT attach drywall studs to the equipment

450

NOTE: The top of each riser is equipped with a 3 in. deep
swaged connection. There is sufficient extension at the
bottom to allow insertion of approxhnately
2 in. of the
riser into the swaged top of the riser below.

3.0

1. Move cabinet into position.

6.8

d__/ /

I/'--J
[/

100

4.0

50 607080

2
t--

•_

150

100

---

100

120

140

160

Water TemperatureDifference - F

cabinet.

Fig. 9 -- Allowable
Riser Lengths
Between
System Expansion
Loops
10

When all units on a riser are anchored into place, complete riser joints as follows:
a. Verify that all riser joints are vertically aligned and
that risers penetrate at least 1 in. into the swaged
joint of the riser below. DO NOT let riser joint bottom out.
b.

Piping Installation
-- All earth loop piping materials should
be limited to polyethylene fusion only for in ground sections of
the loop. Galvanized or steel fittings should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded fittings should be avoided due to their potential to leak
in earth coupled applications. A flanged fitting should be substimted. P/T plugs should be used so that flow can be measured
using the pressure drop of the unit heat exchanger.

Braze riser joints with a high-temperature
alloy
using proper Phos-copper
of Silfos. Soft solder 5050, 60-40, 85-15, or 95-5 or low temperature alloys
are not suitable riser weld materials.

Earth loop temperatures can range between 25 and 110 F.
Flow rates between 2.25 and 3.0 gpm per ton of cooling capacity is recommended in these applications.

Anchor built-in risers to the building structure with
at least one contact point. To accommodate
vertical
expansion and contraction
DO NOT fasten risers
rigidly within the unit.

Verify that unit shut-off valves are closed. DO
NOT OPEN VALVES until the system has been
cleaned and flushed.

Pressures of at least 100 psi should be used when testing.
Do not exceed the pipe pressure rating. Test entire system
when all loops are assembled.

Flush system; refer to System Cleaning
ing section for more information.

Install vents in piping loop as required to bleed the
system of air accumulated
during installation.

Flushing the Earth Loop -- Upon completion of system installation and testing, flush the system to remove all foreign objects and purge to remove all air.

Install supply duct extension(s) provided
by folding the tabs down to secure
cabinet.

Test individual horizontal loop circuits before backfilling.
Test vertical U-bends and pond loop assemblies
prior to
installation.

and Flush-

Antifreeze -- In areas when minilnum entering loop temperarares drop below 40 F or where piping will be routed through
areas subject to freezing, antifreeze is required. Alcohols and
glycols are commonly used as antifreeze; however your local
Carrier distributor should be consulted for the antifreeze best
suited to your area. Freeze protection should be maintained to
15 F below the lowest expected entering loop temperature. For
example, if 30 F is the lninilnum expected entering loop temperature, the leaving loop temperature would be 25 to 22 F and
freeze protection should be at 15 F. Calculation as follows:
30F15F= 15F.

with the cabinet
extension(s)
to

COMMERCIAL
WATER LOOP APPLICATION
-- Coinmercial systems typically include a number of units connected
to a common piping system. Any unit plumbing maintenance
work can introduce air into the piping system; therefore, air
elimination equipment is a major portion of the mechanical
room plumbing. In piping systems expected to utilize water
temperatures below 50 F, 1/2 in. closed-cell insulation is required on all piping surfaces to eliminate condensation. Metal
to plastic threaded joints should never be used due to their tendency to leak over time.

All alcohols should be premixed and pumped from a reservoir outside of the building when possible or introduced under
the water level to prevent fumes. Calculate the total volume of
fluid in the piping system. Then use the percentage by volume
shown in Table 2 for the amount of antifreeze needed. Antifreeze concentration
should be checked from a well mixed
sample using a hydrometer to measure specific gravity.

Teflon tape thread sealant is recommended for use in system
piping to minimize internal fouling of the heat exchanger. Do
not over tighten connections and route piping so as not to interfere with service or maintenance access. Hose kits include shut
off valves, pressure/temperature
(P/T) plugs for performance
measurement,
high pressure stainless steel braided hose, and
hose adaptors.
Balancing
also be used.

valves and variable

speed pumping

Table 2 -- Antifreeze Percentages
TYPE

systems my
Methanol
100% USP Food Grade
Propylene Glycol
Ethanol*

The piping system should be flushed to remove dirt, pipe
shavings, chips, and other foreign material prior to operation.
See System Cleaning and Flushing section. The flow rate is
usually set between 2.25 and 3.5 gpm per ton for most
applications of water loop heat pumps. To ensure proper maintenance and servicing, P/T ports are imperative for temperature
and flow verification, as well as performance checks.

by Volume

MINIMUM TEMPERATURE FOR LOW
TEMPERATURE PROTECTION
10 F

15 F

20 F

25 F

25%

21%

16%

10%

38%

25%

22%

15%

29%

25%

20%

14%

*Must not be denatured with any petroleum based product.

OPEN - LOOP GROUND WATER SYSTEMS -- Shut off
valves should be included for ease of servicing. Boiler drains or
other valves should be "tee'd" into the lines to allow acid flushing of the heat exchanger. P/T plugs should be used so that
pressure drop and temperature can be measured. Piping materials should be limited to copper or PVC SCH80.

Water loop heat pump (cooling tower/boiler) systems typically utilize a common loop, maintained between 60 to 90 E
The use of a closed circuit evaporate cooling tower with a secondary heat exchanger between the tower and the water loop is
recommended.
If an open type cooling tower is used continuously, chemical treatment and filtering will be necessary.
GROUND-LOOP
HEAT PUMP APPLICATION

NOTE: Due to the pressure
SCH40 is not recommended.

and temperature

extremes,

PVC

Water quantity should be plentiful and of good quality. Consult Table 3 for water quality guidelines and recommendations.
Copper is recommended for closed loop systems and open loop
ground water systems that are not high in mineral content or
corrosiveness. In ground water situations where scaling could
be heavy or where biological growth such as iron bacteria will
be present, an open loop system is not recommended. Heat exchanger coils may over time lose heat exchange capabilities
due to build up of mineral deposits. Heat exchangers must only
be serviced by a qualified technician, as acid cleaning agents
and special pumping equipment are required.

NOTE: In most commercial
building applications using a
frame style or plate style heat-exchanger
should be used to isolate the water source heat pump units from the ground water
loop increasing system performance, equipment longevity.
Pre-Installation
-- Prior to installation, locate and mark all existing underground utilities, piping, etc. Install loops for new
construction
before sidewalks, patios, driveways, and other
construction has begun. During construction, accurately mark
all ground loop piping on the plot plan as an aid in avoiding potential furore damage to the installation.
11

Inareas
withextremely
hardwater,
theownershould
beinformed
thattheheatexchanger
mayrequire
additional
system
maintenance
andoccasional
acidflushing.

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.

Water Supply and Quality -- Check water supply. Water supply should be plentiful and of good quality. See Table 3 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. This damage is not the
responsibility of the manufacturer.

Table 3 -- Water Quality Guidelines
CONDITION

MATERIAL*
HX

REClRCULATINGt
CLOSED

OPEN LOOP AND REClRCULATING

Scaling Potential -- Primary Measurement
Above the given limits, scaling is likely to occur, Scaling indexes should be calculated
pH/CalciUmHardness
Method

All

Index Limits for Probable Scaling

Situations

N/A
(Operation

outside

<100 ppm

is not recommended.)

Scaling indexes should be calculated at 150 F for direct use and HWG applications,
implemented.
Ryznar Stability Index

using the limits below,
pH < 7.5 and Ca Hardness,

these limits

WELL**

and at 90 F for indirect HX use. A monitoring plan should be

All

N/A

6.0 - 7.5
If >7.5 minimize steel pipe use.

All

N/A

-0.5 to +0.5
If <-0.5 minimize steel pipe use.
Based upon 150 F HWG and direct well, 85 F indirect well HX.

Iron Fe 2+ (Ferrous)
(Bacterial Iron Potential)

All

N/A

<0.2 ppm (Ferrous)
If Fe2+ (ferrous) >0.2 ppm with pH 6 - 8, 02<5 ppm check for iron bacteria.

Iron Fouling

All

N/A

<0.5 ppm of Oxygen
Above this level deposition will occur.

All

6 - 8.5
Monitor/treat as needed.

6 - 8.5
Minimize steel pipe below 7 and no open tanks with pH <8.

All

N/A

At H2S>0.2 ppm, avoid use of copper and cupronickel piping or HXs.
Rotten egg smell appears at 0.5 ppm level.
Copper alloy (bronze or brass) cast components are okay to <0.5 ppm.

All

N/A

Langelier Saturation

Index

Iron Fouling

Corrosion

Preventiontt

pH
Hydrogen Sulfide (H2S)

Ammonia Ion as Hydroxide,
Chloride, Nitrate and Sulfate
Compounds
Maximum Chloride Levels

<0.5 ppm

Maximum allowable at maximum water temperature.
50 F (10 C)
<20 ppm
<150 ppm
<400 ppm
<1000 ppm
>1000 ppm

75 F (24 C)
NR
NR
<250 ppm
<550 ppm
>550 ppm

100 F (38 C)
NR
NR
<150 ppm
<375 ppm
>375 ppm

Copper
CuproNickel
304 SS
316 SS
Titanium

N/A
N/A
N/A
N/A
N/A

All

<10 ppm of particles and
a maximum
velocity
of 6
fps.
Filtered for
maximum
800 micron size.

<10 ppm (<1 ppm "sandfree" for reinjection) of particles and a maximum velocity of 6 fps. Filtered for maximum 800 micron size. Any particulate that is not removed can potentially clog components.

All

N/A

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

Erosion and Clogging
Particulate Size and Erosion
Brackish

HWG-HX
-N/A -NR
SS

---

LEGEND
Hot Water Generator
Heat Exchanger
Design Limits Not Applicable Considering
Potable Water
Application Not Recommended
Stainless Steel

ttlf

Recirculating

*Heat exchanger materials considered are copper, cupronickel,
304 SS (stainless steel), 316 SS, titanium.
fCIosed recirculating system is identified by a closed pressurized
piping system.
**Recirculating open wells should observe the open recirculating
design considerations.

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.
To convert ppm to grains per gallon, divide by 17. Hardness in
mg/I is equivalent to ppm.

Step
6
-Connections

Wire

Field

Power

Supply

serial plate. Line and low voltage wiring must be done in
accordance with local codes or the NEC, whichever is applicable.

POWER CONNECTION
Units Equipped with Disconnect
-- Connect incoming line
voltage to the disconnect switch and ground wire to the ground
lug provided inside the electrical compartment.

Electrical shock can cause personal iniury or death. When
installing or servicing system, always turn off main power
to system. There may be more than one disconnect switch.

Units without Disconnect -- Line voltage connection is made
by connecting the incoming line voltage wires to the line
side(s) of the contactor.
208/230-VAC
OPERATION--All
colmnercial
208/230-v
units are factory wired for 208-v single-phase operation. For
230-v single-phase operation the primary voltage to the transformer must be changed. Remove the red lead from the compressor contactor capping it with a wire nut and connecting the
orange 230-vac lead wire from the transformer to the compressor contactor.

ELECTRICAL-LINE
VOLTAGE -- All field-installed wiring, including electrical ground, must comply with the National
Electrical Code (NEC) as well as all applicable local codes. Refer to Tables 4 and 5 for fuse sizes. Refer to Table 6 for blower
speed wiring. See Fig. 10 for field connections or the electrical
diagram located on the back of the electrical compartment front
panel. All electrical connections must be made by the installing
(or electrical) contractor. All final electrical connections must
be made with a length of flexible conduit to minhnize vibration
and sound transmission to the building.

NOTE: Failure to change the primary voltage lead when using
240-vac line voltage may result in electrical component damage and intermittent system failure.

General Line Voltage Wiring
-Be sure the available
power is the same voltage and phase shown on the unit

Table 4 -- Cabinet Electrical Data -- 50VS Unit
S U P PLY
VOLTAGE
V-Hz-Ph

MOTO R
VOLTAGE
V-Hz-Ph

FAN MOTOR
FLA (A)

MOTOR POWER (W)

50VSA,B

208/230-1-60

0.30

130

6.5

50VSC,D

208/230-1-60

0.40

142

8.6

50VSE,F

208/230-1-60

0.88

180

11.9

50VSG,H

208/230-1-60

1.18

240

12.5

50VSI,J

208/230-1-60

1.60

304

16.2

50VSK,L

208/230-1-60

1.80

368

19.5

50VSM,N

208/230-1-60

2.06

442

21.0

UNIT

MIN CIRCUIT
AMP

MAX FUSE SIZE (A)

LEGEND
FLA

Full Load Amps

Table 5 -- Chassis Electrical

Data -- 50VS Unit

UNIT

SUPPLY
VOLTAGE
V-Hz-Ph

50VSA,B

208/230-1-60

6.5

3.27

4.0

3.75

4.60

50VSC,D

208/230-1-60

8.6

4.40

4.0

5.25

6.25

50VSE,F

208/230-1-60

11.9

6.30

5.4

7.07

8.80

50VSG,H

208/230-1-60

12.5

6.70

7.6

7.50

9.00

50VSI,J

208/230-1-60

16.2

8.20

8.0

9.20

11.70

50VSK,L

208/230-1-60

19.5

11.00

10.4

12.20

14.10

50VSM,N

208/230-1-60

21.0

12.70

16.0

13.65

16.50

MIN CIRCUIT
AMP

MAX FUSE
SIZE (A)

COMPRESSOR
(LRA)

COOLING
CURRENT (A)

MAX COOLING
CURRENT (A)

LEGEND
LRA

Locked Rotor Amps

Table 6 -- 50VS Unit Blower Performance and Speed Wiring
UNIT

FAN SPEED
AND WIRING

RATED
CFM

MIN
CFM

0.01

0.05

0.1

50VSA,B

LOW (Black)
HI (Blue)

360

260

361
316

358
310

341
294

321
278

294
262

50VSC,D

LOW (Blue)
HI (Red)

420

300

424
361

421
358

398
341

376
321

350
305

50VSE,F

LOW (Black)
HI (Blue)

540

390

551
470

549
465

535
455

521
439

509
428

50VSG,H

LOW (Blue)
HI (Red)

630

455

626
551

622
549

604
535

592
521

577
509

50VSI,J

LOW (Orange)
HI (Brown)

820

600

821
768

817
765

814
762

812
759

802
751

50VSK,L

LOW (Black)
HI (Blue)

1080

780

1081
956

1075
951

1070
942

1049
928

1024
911

50VSM,N

LOW(Blue)
HI (Red)

1220

850

1222
1102

1219
1096

1194
1091

1160
1070

1129
1044

NOTE: Operation not recommended

in shaded area.

EXTERNAL
0.15

STATIC

PRESSURE

(in. wg)

HEATING
CURRENT (A)

MAX HEATING
CURRENT (A)

BLOWER SPEED WIRING

Unit
208-230160/1
PowerSupply

!
BI k

Unit

Orange

Brown

Black

Blue

Red

50VSA,B

Low

High

50VSC,D
50VSE,F

---

Low
--

High
Low

-High

---

50VSG,H

Low

High

50VSI,J
50VSK,L

Low
--

High
--

-Low

-High

---

50VSM,N

Low

High

0plonaI
Note

4
Oap

-White
©range-

Note

I
BRt

o
Transformer

io-:
.........

oo
See Chart
Above

Pl
Orange

YlC_
(_

........

......I-Yell°w
I
/_W[liLe!

SWl ollot

.....
xq@o_

Note,I_51.......
I-=.o-*--A
SUPPLY

RETURN

SUPPLY AIR TO ROOM

T RETURN AIR FROM ROOM

LEFT

RIGHT

CABINET

Field-supplied
and installed piping
Cross hoses in slave cabinet
(36 in. hoses required in slave unit)

FRONT

Supply Grille Sizes and Arrangements
UNIT

DISCHARGE
Single Double
10x8

(in.)
Triple

50VSA,B
(Small Cabinet)

14xl 2

50VSC,D
(Small Cabinet)

14xl 2

10x8

50VSE,F
(Small Cabinet)

14x12

10x8

50VSG,H
(Small Cabinet)

14x12

10x8

50VSI,J
(Large Cabinet)

16x14

12x10

50VSK, L
(Large Cabinet)

16x14

12x10

50VSM,N
(Large Cabinet)

16x14

12x10

SLAVE

"_1

I"_'-

MASTER

10x8
Dimension to suit local codes
and installer

LEGEND
C -RS --

Condensate
Return
Supply

Drain

NOTES:
1, Refer to the table and the airflow arrangements above to determine grille
size and location based on the type and size of the unit cabinet/chassis
combination,
2, The riser compartment is defined as being the rear of each unit, Supply air
grilles and return air/access panel can be any side except rear,
3, Return air location also denotes the control location and servicing access,
4, Single discharge openings are not recommended for 50VSI-VSN units,
Triple discharge openings are not recommended for 50VSA-VSD units,

Fig. 12 -- 50VS Unit Airflow Arrangements
17

Table 9 -- Limits of Operation
Air Limits

Cooling (F)

Heating (F)

Ambient Air Maximum

Ambient Air Minimum

1O0

80,6
80,6/66,2

68
68

100/83

50-110

30-70

120

Rated Ambient Air
Rated Entering Air (db/wb)
Entering Air Maximum (db/wb)
Entering Water Minimum*
Entering Water (Normal)
Entering Water Maximum

IMPORTANT: Jumpers and DIP switches should only
be clipped when power to control board has been turned
off.
Table 10-

5.
6.

insulation when operating below the dew point,

Unit fan: Manually rotate fan to verify flee rotation and
ensure that blower wheel is secured to the motor shaft. Be
sure to remove any shipping supports if needed. DO NOT
oil motors upon start-up. Fan motors are pre-oiled at the
factory. Check unit fan speed selection and compare to
design requirements.
Condensate line: Verify that condensate
properly pitched toward dram.

(PC)

1 -- Test/Normal

2 -- FP1 15 F/32 F

ON
ON

ON or
OFF

OFF

4 -- RV Cooling
Off/On

5 -- Com2/Coml

OFF

6 -- Corn2 Modbus
Address

OFF

7 -- Corn2 Modbus
Address

OFF

8 -- Corn2 Modbus
Address

OFF

LEGEND
----

Dual In-Line Package
Personal Computer
Printed Circuit Board

Table 11 -- BacNet TM Control Board (PCB)
DIP SWITCH NUMBER

Checkout
for
set

System pH: Check and adjust water pH if necessary to
maintain a level between 6 and 8.5. Proper pH promotes
longevity of hoses and fittings.

Cooling tower/boiler:
points and operation.

Check

equipment

for proper

Standby pumps: Verify that the standby pump is properly
installed and in operating condition.

System controls: Verify that system controls function and
operate in the proper sequence.

Low water temperature cutout: Verify that low water
temperature cutout controls are provided for the outdoor
portion of the loop. Otherwise, operating problems may

DIP -PCB --

OFF

5
6

OFF
OFF

OFF

Dual In-Line Package
Printed Circuit Board

DIP Switch

Settings

DIP SWITCH

1 (Test Mode = Off/Normal

and Operation
Mode = On)

Test Mode -- Test mode is used to speed up the operation
sequence of the unit, therefore creating a more timely troubleshooting technique. All time delays are shorted by 10 times
with the exception of the high-pressure
lockout which is
instantaneous
regardless of which mode the switch is positioned. DIP switch 1 must be placed into the Normal mode to
resume proper operation of the unit.

set

DIP SWITCH

2 (FP 1 at 15 F = Off/FP

1 at 32 F = On)

Water Side Freeze Protection Setting -- DIP switch 2 is used
to determine the loop freeze protection setting. Depending on
the brine concentration of the liquid source, the temperature
can be set at 15 F or 32 F. The switch MUST be set to the "On"
position if pure water is used as the source brine. This is normally the case in open loop systems. Set the DIP switch to the
"OIF' position for closed loop systems that contain a brine concentration that allows liquid temperatures to fall to, or below,
15E

occur.

System control center: Verify that the control center and
alarm panel have appropriate set points and are operating
as designed.

FIELD SELECTABLE

POSITION OFF/ON

LEGEND

System flushing: Verify that all hoses are connected end
to end when flushing to ensure that debris bypasses the
unit heat exchanger, water valves and other components.
Water used in the system must be potable quality initially
and clean of dirt, piping slag, and strong chemical cleaning agents. Verify that all air is purged from the system.
Air in the system can cause poor operation or system
corrosion.

LonWorks

DIP
PC
PCB

Unit controls: Verify that the microprocessor
DIP (dual
m-line package) switches are set for proper operation and
system configuration.

1. System water temperature: Check water temperature
proper range and also verify heating and cooling
points for proper operation.
2.

BacNet

line is open and

Water flow balancing: Record inlet and outlet water temperatures for each heat pump upon start-up. This check
can eliminate nuisance trip outs and high velocity water
flow that could erode heat exchangers.

System

Modbus

No
Network

3 -- Tstat Comm/
24-vae

Dry Bulb
Wet Bulb

*Requires additional

PROTOCOL

DIP SWITCH
NUMBER

LEGEND
db -wb--

Heat Pump Control Board (PCB)

DIP SWITCH 3 (Tstat at Cmmn= off/tstat at 24-vac = On)
Thermostat Selection -- DIP switch 3 is used to select the
type of thermostat that will be used to control the unit. A digital colr_numcatmg thermostat can be purchased with the unit
that will allow all fault signals to be displayed on the
thermostat. This allows for efficient troubleshooting
and does
not require that the technician access the electrical control box

INPUTS

Jumpers and DIP switches on the control board are used to
customize unit operation and can be configured in the field. See
Tables 10 and 11 for heat pump and BacNet control board DIP
switch settings.

todetermine
theuniterror.If adigitalcolmnunicating
thermostatisused
DIPswitch
3mustbesetinthe"Off"position.
If a
24-vac
thermostat
is usedsetDIPswitch3 intothe"On"
position.
DIPSWITCH
4 (RVatCooling
= Off/RVatCooling= On)

HEATING FIRST STAGE (Y1) -- When the microprocessor receives (Y1) at the 24-vac thermostat input connection the
unit will proceed with the cooling first stage sequence. The microprocessor must receive these signals for 2 continuous seconds before it recognizes the inputs as valid. Once the input
signals are determined to be valid the reversing valve will
energize/deenergize after 5 seconds. The microprocessor will
then verify that the anti short cycling delay has been satisfied.
Once the anti short cycling delay has been satisfied the compressor and will cycle "On." The blower will cycle "On" in low
speed 15 seconds after the compressor is cycled "On."
HEATING SECOND STAGE (Y1, Y2) -- When the microprocessor receives (Y1, Y2) at the 24-vac thermostat input
connection the unit will proceed with the heating second stage
sequence. The microprocessor must receive these signals for
2 continuous seconds before it recognizes the inputs as valid.
Once the input signals are determined to be valid the reversing
valve will energize/deenergize after 5 seconds.
The microprocessor will then verify that the anti short cycling delay has been satisfied. Once the anti short cycling delay
has been satisfied the compressor and will cycle "On." The
blower will cycle "On" in high speed 15 seconds after the compressor is cycled "On."
FAN ONLY MODE (G) -- The fan only mode can be used
only with a 24-vac thermostat and will energize the low speed
blower when a (G) input has been received at the 24-vac thermostat input connection. When the input is removed the blower will deenergize immediately.

Reversing Valve Operation -- DIP switch 4 is used to determine the reversing valve (RV) position in the Cooling mode
(deenergized/energized).
This function is used only when a 24vac thermostat is used and is determined by the reversing valve
output of the thermostat in the Cooling mode. If the thermostat
deenergizes the reversing valve in the Cooling mode then set
the DIP switch in the "Off" position. If the thermostat energizes the reversing valve in the Cooling mode set the DIP
switch in the "On" position.
DIP Switch 5

(Corn2 = Off/BacNet
(Coml

DIP Switch 6

(Corn2 modbus address)

DIP Switch 7

(Corn2 modbus address)

DIP Switch 8

(Corn2 modbus address)

Standard

or LonWorks(R))

= On!Colmnunicating

24-vac Sequence

Thermostat)

of Operation

RANDOM START DELAY -- When the unit is first powered "On" the control microprocessor
will generate a random
number to determine the start delay of the compressor operation (3 to 5 minutes). This delay is used to prevent multiple
units from cycling "On" at the same time. The purpose is to
prevent a large power load on the building electrical system after a power outage. After the number, or delay time, is generated the microprocessor
will use this thne to determine the minimum amount of time that must be delayed before the compressor is cycled "On" after a demand is received from the
thermostat.

START-UP
1. Turn on the line power to all heat pumps.
2. Turn the thermostat fan position to "ON." Blower should
start.

ANTI SHORT CYCLING DELAY -- After
the
random
start delay is generated the microprocessor
will use this time to
determine the minimum amount of time that must be delayed
before the compressor
is cycled "On" after a demand is
received from the thermostat. This allows the refrigerant system to equalize in pressure and prevents short-cycling of the
compressor.
MINIMUM COMPRESSOR
RUNTIME -- The minimum
compressor
mntime of each cycle, heating or cooling, is
60 seconds. Once the compressor is energized it will not deenergize, even if the thermostat input is removed, until the minimum mntime is satisfied.
COOLING FIRST STAGE (Y1, O) -- When the microprocessor receives (Y1, O) at the 24-vac thermostat input connection the unit will proceed with the cooling first stage sequence.
The microprocessor
must receive these signals for 2 continuous seconds before it recognizes the inputs as valid. Once the
input signals are determined to be valid the reversing valve will
energjze/deenergize
after 5 seconds.

Balance airflow at registers.

Adjust all valves to their full open positions. Room
temperature should be within the minimum-maximum
ranges of Table 9. During start-up checks, loop water
temperature entering the heat pump should be between
60 and 95 E

Two factors determine the operating limits of the 50VS
heat pumps: supply-water temperature and the return-air
temperature. When any one of these factors is at a minimum or maxhnum level, the other factor must be at a normal level to ensure proper unit operation.
a.

Adjust the unit thermostat to the warmest setting.
Place the thermostat
mode switch in the "COOL"
position. Slowly reduce thermostat setting until the
compressor activates.

Check for cool air delivery at the unit grille within
a few minutes after the unit has begun to operate.
NOTE: Units have a 3 to 5 minute time delay in
the control circuit that can be eliminated
on the
microprocessor
control
board.
See test mode
described in the DIP Switch Settings and Operation section.

The microprocessor
will then verify that the anti-short cycling delay has been satisfied. Once the anti short cycling delay
has been satisfied the compressor and will cycle "On." The
blower will cycle "On" in low speed 15 seconds after the compressor is cycled "On."
C.

COOLING
SECOND STAGE (Y1, Y2, O)When the microprocessor receives (Y1, Y2, O) at the 24-vac thermostat input connection the unit will proceed with the cooling second
stage sequence. The microprocessor must receive these signals
for 2 continuous seconds before it recognizes the inputs as valid. Once the input signals are determined to be valid the reversing valve will energize/deenergize
after 5 seconds. The microprocessor will then verify that the anti short cycling delay has
been satisfied. Once the anti short cycling delay has been satisfied the compressor and will cycle "On." The blower will cycle
"On" in high speed 15 seconds after the compressor is cycled
"On."
19

Check the elevation and cleanliness of the condensate lines. Dripping
may be a sign of a blocked
line. Check that the condensate trap is filled to provide a water seal.

Refer to Table 12. Check the temperature
of both
entering and leaving water. If temperature is within
range, proceed with the test. If temperature
is
outside of the operating range, see Troubleshooting
section.

Check air temperature
drop across the air coil
when compressor
is operating.
Air temperature
drop should be between 15 and 25 E

f. Turnthermostat
to"OFF"position.
A hissing
noise
indicates
properfunctioning
ofthereversing
valve.
g. Allow 5 minutesbetween
testsfor pressure
to
equalize
before
beginning
heating
test.
h. Adjustthethermostat
tothelowestsetting.
Place
the thermostat
position.

mode

switch

the

Slowly raise the thermostat to a higher temperature
until the compressor activates.

Check for warm air delivery within
after the unit has begun to operate.

Refer to Table 9. Check the temperature
of both
entering and leaving water. If temperature is within
range, proceed with the test. If temperature
is outside of the operating
range,
check refrigerant
pressures.
Check air temperature rise across the air coil when
compressor
is operating.
Air temperature
rise
should be between 20 and 30 F.

in. Check for vibration,

Lockout

Mode E If the microprocessor board is flashing
a system warning and the unit is locked out and not running,
the lockout can be cleared from the microprocessor
by a momentary shutdown
of incoming
line voltage (208-vac or
230-vac). A lockout that still occurs after line voltage shutdown means that the fault still exists and needs to be repaired.

"HEAT"

Extreme variations in temperature and humidity and/or corrosive water or air will adversely affect unit performance, reliability, and service life.

HIGH-PRESSURE
LOCKOUT (HP) -- The high-pressure
lockout will occur if the discharge pressure of the compressor
exceeds 600 psi. The lockout is ilrnnediate and has no delay
from the time the high-pressure
switch opens to the lockout.
Upon lockout the compressor will be deenergized ilmnediately.
The blower will be deenergized 15 seconds after the compressor is deenergized.

a few minutes

noise, and water leaks.

If unit fails to operate, perform troubleshooting
analysis
(see troubleshooting
section). If the check described fails
to reveal the problem and the unit still does not operate,
contact a trained service technician to ensure proper diagnosis and repair of the equipment.

When testing is complete,
comfort level.

set system to maintain

FREEZE PROTECTION
1 LOCKOUTThe freeze protection 1 lockout will occur if the liquid line temperature falls
below the set point (15 F or 30 F) for 30 continuous seconds.
See DIP switch 2 description in the DIP Switch Settings and
Operation section. The compressor will then be deenergized
and the blower will deenergize 15 seconds after the compressor
is deenergized.

desired

NOTE: If performance during any mode appears abnormal
refer to the troubleshooting section of this manual. To obtain
maximum performance, the air coil should be cleaned before
start-up. Use a coil cleaner for use on indoor evaporator refrigeration equipment.

FREEZE PROTECTION
2 LOCKOUT -- The freeze protection 1 lockout will occur if the air coil temperature falls below the set point 32 F for 30 continuous seconds. See DIP
switch 2. The compressor will then be deenergized and the
blower will deenergize
15 seconds after the compressor
is
deenergized.

Table 12 -- Temperature Change Through Heat
Exchanger

CONDENSATE
OVERFLOW
1 LOCKOUT
(CO1) -The unit contains one condensate overflow sensor located in
the chassis drain pan below the air coil. A condensate lockout
will occur if the sensor senses condensate for 30 continuous
seconds. The compressor will then be deenergized
and the
blower will deenergize
15 seconds after the compressor
is
deenergized.
OVER/UNDER
VOLTAGE PROTECTION
-- If the unit
control voltage is less than 18-vac or greater than 30-vac the
unit will shut down all inputs ilrnnediately. Once the voltage
has reached acceptable levels the unit microprocessor
will
power "On" automatically and resume previous operation.
LEAVING
WATER
TEMPERATURE
SENSOR
FAILURE (LWT)If the leaving water temperature
thermistor
fails it will not affect the operation of the unit. This sensor is for
monitoring purposes only.
DISCHARGE
AIR TEMPERATURE
SENSOR FAILURE
(DAT)If the discharge temperature thermistor fails it will
not affect the operation of the unit. This sensor is for monitoring purposes only.
FREEZE
PROTECTION
1 TEMPERATURE
SENSOR
FAILURE (FP1) --If the freeze protection 1 thermistor fails
for 30 continuous seconds an FP1 lockout will occur. The
compressor will then be deenergized and the blower will deenergize 15 seconds after the compressor is deenergized. The sensor must be replaced if this lockout occurs.
FREEZE
PROTECTION
2 TEMPERATURE
SENSOR
FAILURE (FP2) -- If the freeze protection 2 thermistor fails
for 30 continuous seconds an FP2 lockout will occur. The
compressor
will then be deenergized
and the blower will
deenergize 15 seconds after the compressor is deenergized. The
sensor must be replaced if this lockout occurs.

WATER FLOW GPM
For Closed Loop: Ground
Source or Closed Loop
Systems at 3 gpm per ton
For Open Loop: Ground Water
Systems at 1.5 gpm per ton

Operating

RISE IN
COOLING (°F)

DROP IN
HEATING (°F)

9-12

4-8

20-26

10-17

Limits

ENVIRONMENTUnits are designed for indoor installation only. Never install units in areas subject to freezing or
where humidity levels could cause cabinet condensation (such
as unconditioned spaces subject to 100% outside air).
POWER SUPPLY -- A voltage variation
plate utilization voltage is acceptable.

of_+ 10% of name-

STARTING
CONDITIONSStarting conditions vary depending upon model number and are based upon the following:
•

•
•

•

Conditions in Table 9 are not normal or continuous operating conditions. Minimuln/lnaximuln
limits are start-up conditions to bring the building space up to occupancy
temperatures. Units are not designed to operate under these
conditions on a regular basis.
Voltage utilization range complies with ARI Standard 110.
Determination
of operating limits is dependent primarily
upon three factors:
a.

Ambient

Return

c.
When
levels,
ensure

temperature
air temperature

Water temperature
any one of these factors is at lninimum or maximum
the other two factors should be at normal levels to
proper unit operation.
20

SERVICE

check to ensure amp draw is no more than 10% greater than indicated on serial data plate.

Evaporator

Coil -- The air coil must be cleaned to obtain maximum performance. Check once a year under normal
operating conditions and, if dirty, brush or vacuum clean. Care
must be taken not to damage the aluminum fins while cleaning.

Electrical shock can cause personal iniury or death. When
installing or servicing system, always turn off main power
to system. There may be more than one disconnect switch.

Use caution when cleaning the coil fins as the fin edges are
extremely sharp. Failure to heed this warning could result
in personal iniury.

The 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.

Cabinet

_ The cabinet can be cleaned using a mild
detergent. Do not allow water to stay m contact with the cabinet for long periods of thne to prevent corrosion of the cabinet
sheet metal.

Water Coil Maintenance

Refrigerant System -- To maintain

CLOSED LOOP SYSTEM (All Other Water Loop Applications) -- Generally water coil maintenance is not needed for
closed loop systems. However, if the piping is known to have
high dirt or debris content, it is best to establish a periodic
maintenance schedule with the owner so the water coil can be
checked regularly. Dirty installations are typically the result of
deterioration of iron or galvanized piping or components in the
system. Open cooling towers requiring heavy chemical treatment and mineral build-up through water use can also contribute to higher maintenance.
Should periodic coil cleaning be
necessary, use standard coil cleaning procedures, which are
compatible with both the heat exchanger material and copper
water lines. Generally, the more water flowing through the unit,
the less chance for scaling. However, flow rates over 3 gpm per
ton can produce water (or debris) velocities that can erode the
heat exchanger wall and ultimately produce leaks.

sealed circuit integrity, do not install service gages unless unit operation appears
abnormal. Verify that air and water flow rates are at proper levels before servicing the refrigerant circuit.

TROUBLESHOOTING

Lockout Modes

_ If the microprocessor
board is flashing a system warning and the unit is locked out and not running, the lockout can be cleared from the microprocessor by a
momentary shutdown of incoming line voltage (208-vac or
230-vac). A lockout that still occurs after line voltage shudown
means that the fault still exists and needs to be repaired.
HIGH-PRESSURE
LOCKOUT (HP) -- The high-pressure
lockout will occur if the discharge pressure of the compressor
exceeds 600 psi. The lockout is ilr_nediate and has no delay
from the time the high-pressure
switch opens to the lockout.
Upon lockout the compressor will be deenergized ilmnediately.
The blower will be deenergized 15 seconds after the compressor is deenergized.

OPEN LOOP SYSTEM (Direct Ground Water) -If the
system is installed m an area with a known high mineral content (125 ppm or greater) in the water, it is best to establish a
periodic maintenance schedule with the owner so the coil can
be checked regularly. Should periodic coil cleaning be necessary, use standard coil cleaning procedures, which are compatible with the heat exchanger material and copper water lines.
Generally, the more water flowing through the unit, the less
chance for scaling. Therefore, 1.5 gpm per ton is recolr_nended
as a minhnum flow. Minimum flow rate for entering water
temperatures below 50 F is 2.0 gpm per ton.

LOW-PRESSURE
LOCKOUT (LP) -The low-pressure
lockout will occur if the suction pressure falls below 40 psi for
30 continuous seconds. The compressor will then be deenergized and the blower will deenergize 15 seconds after the compressor is deenergized.
FREEZE PROTECTION
1 LOCKOUT -- The freeze protection 1 lockout will occur if the liquid line temperature falls
below the set point (15 F or 30 F) for 30 continuous seconds.
See DIP switch 2 description in the DIP Switch Settings and
Operation section. The compressor will then be deenergized
and the blower will deenergize 15 seconds after the compressor
is deenergized.

Filters

-- A clean filter must be used to obtain maximum
performance. Filters should be inspected every month under
normal operating conditions. It is especially flnportant to provide consistent washing of these filters (in the opposite direction of the normal airflow) once per month. Never operate a
unit without a filter, severe system damage can occur.

FREEZE PROTECTION
2 LOCKOUT -- The freeze protection 2 lockout will occur if the air coil temperature falls below the set point (32 F) for 30 continuous seconds. See DIP
switch 2 description in the DIP Switch Settings and Operation
section. The compressor
will then be deenergized
and the
blower will deenergize
15 seconds after the compressor
is
deenergized.

Condensate Drain-

In areas where airborne bacteria
may produce an algae build-up in the dram pan, it may be necessary to remove and treat the drain pan chemically with an algaecide approximately
every three months to minimize the
problem. The condensate pan may also need to be cleaned periodically to ensure indoor air quality. The condensate dram can
pick up lint and dirt, especially with dirty filters. Inspect the
dram twice a year to avoid the possibility of plugging.

Compressor

_ Conduct annual amperage checks to insure that amp draw is no more than 10% greater than indicated
on the serial data plate.

Fan Motors
odic maintenance
dirt accumulating
failure. Conduct

All units have lubricated fan motors. Perioiling is not recolmnended, as it will result in
in the excess oil and cause eventual motor
annual dry operation check and amperage

hasreached
acceptable
levels,theunitmicroprocessor
will
power
onautomatically
andresume
previous
operation.
LEAVINGWATERTEMPERATURE
SENSOR
FAILURE(LWT)-- If theleavingwatertemperature
thermistor
fails,it willnotaffecttheoperation
oftheunit.Thissensor
is
formonitoring
purposes
only.
DISCHARGE
AIRTEMPERATURE
SENSOR
FAILURE
(DAT)-- If thedischarge
temperature
thermistor
fails,it will
notaffecttheoperation
oftheunit.Thissensor
isformonitoringpurposes
only.
FREEZEPROTECTION
1 TEMPERATURE
SENSOR
FAILURE(FP1)--If thefreeze
protection
1thermistor
fails
for 30continuous
seconds
anFP1lockoutwill occur.The

compressor will then be deenergized and the blower will deenergize 15 seconds after the compressor is deenergized. The sensor must be replaced if this lockout occurs.
FREEZE PROTECTION 2 TEMPERATURE SENSOR
FAILURE (FP2) -- If the freeze protection 2 thermistor fails
for 30 continuous seconds an FP2 lockout will occur. The
compressor will then be deenergized and the blower will deenergize 15 seconds after the compressor is deenergized. The sensor must be replaced if this lockout occurs.
If unit performance during any mode appears abnormal, refer to Table 13.

Table 13 -- Troubleshooting
SYSTEM WARNING (FLASH)
LED1
LED2
LED3
LED4

SYSTEM LOCKOUT (STEADY
ON)
LED1
LED2
LED3
LED4

POSSIBLE

Er 1

OFF

FLASH

OFF

Low Airflow (Heating), Low
Water Flow (Cooling)

Er 2

OFF

FLASH

OFF

Low Refrigerant Charge

Er 4

OFF

FLASH

OFF

Water Temperature < 35 F
or < 15 F (Heating)

FAULTDESCRIPTION

ERROR CODE
(COMMTSTAT)

High Pressure Lockout
< 600 psi
Low Pressure Lockout
< 40 psi
Freeze Protection,
Side

Air

Freeze Protection,
Side < 35 F

Air

FAULT CAUSE

Er 5

OFF

FLASH

OFF

Blower Failure (Cooling)

Condensate Overflow

Er 9, Er 10

OFF

FLASH

OFF

FLASH

OFF

Clogged Drain Line

Over/Under Low Voltage
Protection, 18-vac >
voltage, 30-vac

Er 11

OFF

FLASH

OFF

Loss of Power, Brown Out

Er 13

FLASH

OFF

N/A

Sensor Resistance Above
or Below Specification

Er 14

FLASH

OFF

FLASH

N/A

Sensor Resistance Above
or Below Specification

Er 15

FLASH

OFF

FLASH

OFF

Sensor Resistance Above
or Below Specification

Er 16

FLASH

OFF

FLASH

OFF

Sensor Resistance Above
or Below Specification

LWT Sensor Failure (Low
Water Temperature)
DAT Sensor Failure
(Discharge Air
Temperature)
FP1 Sensor Failure
(Freeze Protection)
FP2 Sensor Failure
(Freeze Protection)
LEGEND
LED

-- Light-Emitting

Diode

NOTE: Warning LEDs and error codes are found on the system control board.

Copyright 2008 Carrier Corporation
Manufacturer reserves the right to discontinue,
Catalog No. 04-53500046-01
Printed in U.S.A.

or change at any time, specifications or designs without notice and without incurring obligations.
Form 50VS-1Sl
Pg 22
11-08
Replaces:

New

START-UP

CHECKLIST

CUSTOMER:

JOB NAME:

MODEL NO.:

SERIAL NO.:

DATE:

PRE-START-UP
DOES THE UNiT VOLTAGE CORRESPOND
HAVE THE POWER AND CONTROL
TIGHT?
(Y/N)_
HAVE WATER CONNECTIONS
(Y/N) __
HAS PUMP BEEN TURNED
HAS CONDENSATE

WITH THE SUPPLY VOLTAGE AVAILABLE?

WIRING

CONNECTIONS

(Y/N)

BEEN MADE AND TERMINALS

BEEN MADE AND IS FLUID AVAILABLE AT HEAT EXCHANGER?

ON AND ARE ISOLATION

CONNECTION

IS AN AIR FILTER INSTALLED?

VALVES OPEN?

(Y/N) __

BEEN MADE AND IS A TRAP INSTALLED?

(Y/N) __

II. START-UP
IS FAN OPERATING
IF 3-PHASE
(Y/N) __

WHEN COMPRESSOR

SCROLL COMPRESSOR

OPERATES?

(Y/N) __

IS PRESENT, VERIFY PROPER ROTATION PER INSTRUCTIONS.

UNIT VOLTAGE -- COOLING OPERATION
PHASE AB VOLTS

PHASE BC VOLTS
(if 3 phase)

PHASE CA VOLTS
(if 3 phase)

PHASE AB AMPS

PHASE BC AMPS
(if 3 phase)

PHASE CA MPS
(if 3 phase)

CONTROL VOLTAGE
IS CONTROL VOLTAGE ABOVE 21.6 VOLTS?
IF NOT, CHECK FOR PROPER TRANSFORMER

(Y!N) __
CONNECTION.

TEMPERATURES
FILL IN THE ANALYSIS

COAXIAL HEAT
EXCHANGER

AIR COIL

CHART ATTACHED.

COOLING CYCLE:
FLUID IN

FLUID OUT

PSI

FLOW

HEATING CYCLE:
FLUID IN

FLUID OUT

PSI

FLOW

COOLING
AIR IN

CYCLE:
F

AIR OUT

HEATING
AIR IN

CYCLE:
F

AIR OUT

CL-1

HEATING

CYCLE ANALYSIS
PSI
_\\\

SAT

oF
\\\\\\

,:", AIR ,_
\\COIL\\
oF

SUCTION

\\\\\\
\\\\\\
\

_ ,

COMPRESSOR

\\\\\\

EXPANSION
VALVE
,

\ \

DISCHARGE

\\\\\\

\\LJ

oF
LIQUID LINE

°F
PSI
WATER IN

COOLING

CYCLE

__PSI
WATER OUT

iii
Z

-7
¢h
iii
i-i-o
¢h
(D
Z

ANALYSIS

o,
<
i-__

\\\\\,
\\

PSI

SAT

oF
\\\\

x\\\\\

AIR
_COILO

SUCTION
oF

COMPRESSOR
_\\\\\
_\\\\,

EXPANSION
VALVE

,\\\\\

DISCHARGE

,\\\\,
x\\\\\
_\\\\\

_\\\\\
iii
Z
-7

_'F
LIQUID LINE

¢h
iii

i.°F

PSI
WATER IN

HEAT OF EXTRACTION

(ABSORPTION)

FLOW RATE (OPM) x

__?F

¢h
(D

__PSI
WATER OUT

OR HEAT OF REJECTION
TEMP. DIFF. (DEO. F) x

o,
<
i--

=
FLUID FACTOR*

=
(Btu/hr)

SUPERHEAT

SUBCOOLING

= SUCTION TEMPERATURE
= __
(DEG F)

- SUCTION

= DISCHARGE SATURATION
= __
(DEG F)

SATURATION

TEMPERATURE

- LIQUID LIN_ TEMPERATURE

*Use 500 for water, 485 for antifreeze.

Copyright 2008 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500046-01
Printed in U.S.A.
Form 50VS-1 SI
Pg CL-2
11-08
Replaces:

New

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CARRIER Air Conditioner/heat Pump(outside Unit) Manual L1001423

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