Space Pak SCM-036, SCM-060 Installation, Operation & Maintenance Manual

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Page 1

MODEL SCM

INSTALLATION,

OPERATION

& MAINTENANCE

MANUAL

Air-To-Water

Reverse Cycle Heat Pumps

3 and 5 Ton

SCM2-0118

W30-WG0593

SECTION 1: READ BEFORE PROCEEDING

Model SCM overview .................................................................. 2

SECTION 2: SCM FIELD ADJUSTABLE PARAMETERS SECTION 3: SPECIFICATIONS AND RATINGS SECTION 4: DIMENSIONS SECTION 5: LOCATION & MOUNTING

Prepare the unit .......................................................................... 11

Location ...................................................................................... 11

Handling ...................................................................................... 11

Mounting pad .............................................................................. 11

SECTION 6: RECOMMENDED PIPING DIAGRAM SECTION 7: GLYCOL/WATER SYSTEM

Glycol/water system design ................................................. 13

Glycol/water system installation .................................................. 14

SECTION 8: START-UP AND TEST

BEFORE starting the unit ............................................................ 15

Start the SpacePak heat pump .................................................... 15

Anti-freeze cycle ......................................................................... 16

24-Hour follow-up ........................................................................ 16

Electric heat ................................................................................. 16

Qualied installer only —

This product must be installed

only by a qualied service technician. The installation must be done using recognized industry practices, and in compliance with this manual and all applicable codes. Failure to comply could result in death, serious injury or substantial property damage.

SECTION 9: ELECTRICAL CONNECTIONS

Overcurrent protection & wire sizing ........................................... 17

SpacePak heat pump wiring ............................................. 17

Multiple air handler applications .......................................... ........ 18

SECTION 10: TROUBLESHOOTING SECTION 11: ANNUAL MAINTENANCE

Glycol/water mixture ................................................................... 23

Perform annual inspection .......................................................... 23

Preparing the SCM for shut down ............................................... 23

To restart after shutdown ............................................................ 23

SECTION 12: REPLACEMENT PARTS SECTION 13: LIMITED WARRANTY

For information not included in this

manual, see the following: This manual

includes only basic information for installation, operation and maintenance of SpacePak air to water heat pumps. For more advanced applications and information not shown in this manual, contact SpacePak Technical Support for assistance and supplemental instructions. Call

413-564-5530 in Westeld, MA or visit our

website at www.spacepak.com to send an e-mail or review technical literature.

IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX (413) 564-5815

IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 (905) 670-5888 / FAX (905) 670-5782

Page 2

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 1: READ BEFORE PROCEEDING

Hazard denitions

The following terms are used throughout this manual to bring attention to the presence of potential hazards or to important information concerning the product.

Indicates an imminently hazardous situation which,

if not avoided, WILL result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which,

if not avoided, COULD result in death, serious injury or substantial property damage.

Indicates an imminently hazardous situation which,

if not avoided, MAY result in minor injury or property damage.

Used to notify of special instructions on installation,

operation or maintenance which are important to equipment, but not related to personal injury hazards.

Model SCM overview

The SpacePak Model SCM heat pump is a self contained reverse-cycle heat pump that provides a continuous supply of heated or chilled water for various purposes, such as: residential or small commercial building heating and cooling; and specialty applications, such as computer room cooling or

industrial/agricultural conditioning and dehumidication.

Model SCM heat pumps are available in three- and ve-ton

nominal capacities. Both use the same general design and operating principals.

Each heat pump contains TWO isolated refrigeration systems of equal size to cool or heat the delivered water supply. The two systems can operate individually or in tandem to achieve 50% or 100% capacity. The major components of each system are:

• A hermetically sealed refrigeration compressor & motor.

• An outside coil to reject heat (in cooling) or absorb heat (in heating) from the surrounding ambient air.

• A fan and motor to force air over the outside coil.

• A shell-and-tube refrigerant-to-water heat exchanger to absorb heat (in cooling) or supply heat (in heating) to the deliv-

ered water ow.

• An electronic expansion valve to throttle the refrigerant ow

in both heating and cooling modes of operation, responding to varying load on the system.

• A reversing valve (to select between heating and cooling operation).

• Sensors and safety circuits to monitor and protect the equipment from potentially damaging or dangerous operating conditions.

A single water circuit connects both internal heat exchangers, and contains sensors to measure entering and leaving water

temperatures. A mechanical ow switch safety ensures continuous water ow while either of the two refrigerant

systems is operating. All components are contained within a

supporting structure and enclosure sufcient to allow stand-

alone outdoor installation in all temperate climates.

All operation and protections are managed by a microprocessor controller which operates the individual systems, determines all operating parameters, and monitors the condition of each system. A simple interface communicates with the indoor air handler, heat exchanger, or other load.

Failure to comply with all of the guidelines

BELOW could result in death, serious injury or substantial property damage.

Codes and electrical requirements

• This product must be installed in accordance with all applicable codes. Where instructions in this manual differ

from specic local requirements, defer to the local codes.

• The electrical installation must also comply with the latest edition of: in the U. S. — National Electrical Code ANSI/ NFPA No. 70; in Canada — CSA C22.1 Canadian Electrical Code Part 1. Wiring must be N.E.C. Class 1. Use only copper wire, rated for 120°F and sized for the load listed in this manual.

• Electrical shock hazard — Disconnect all electrical power before servicing the unit. Also, the unit must be grounded in accordance with the Electrical Code listed above.

Refrigerant

• The refrigeration system is factory charged with R410A refrigerant, and requires no additional service during installation. Any repair, diagnosis or maintenance service to the refrigeration

system must be performed by a qualied technician. No

alternate refrigerants, lubricants or additives are approved for this unit. Any use of alternate or non-approved materials in the refrigeration system may result in personal injury or equipment damage, and will void the manufacturer’s warranty.

Liquid side

The uid in the liquid side of the Model SCM

must be an anti-freeze/water mix.

• The antifreeze percentage must be at least 10%. Follow

guidelines in this manual to nd the required antifreeze mix for the application. Thoroughly ush the system before lling.

• The system must be supplied with a pump sized to provide

the minimum ow rates specied in this manual. Pump

selection must consider the pressure loss through the system and its components plus the pressure loss through the SCM’s heat exchanger and internal components. The pump must be rated for use with chilled water/glycol mixture.

• Install a y-strainer at the liquid input of the heat pump as shown in this manual to prevent damage to the heat exchanger from sediment.

• DO NOT use for potable water heating. The single-wall heat exchanger is not suitable for the application.

Ambient limits

• See information in this manual for heating and cooling performance versus ambient temperature.

• For applications requiring cooling at outdoor temperatures below 55°F, contact SpacePak Technical Support for assistance.

• DO NOT disconnect power in cold temperatures. Power must be on to allow the anti-freeze cycle to operate.

SCM controller

• The SCM controller provides adjustability of various operating

parameters to address specic applications. See Section 2

for detailed instructions to adjust these parameters.

– 2 –

Page 3

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Figure 1

Section 2: SCM Field Adjustable Parameters

Keypad

The keypad is used to set the unit operating values (see Parameters/alarms – Keypad combinations).

– 3 –

Page 4

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 2: SCM Field Adjustable Parameters (continued)

Figure 2 Menu Structure

Save in the EEPROM

parameters r*

parameters P*

parameter

values

regulation

alarm

main menù

setting password

parameters F-r*

software

parameters H*

unit setting

And

For 5”

parameters /*

probe settings

parameters F*

parameter level

parameters A*

antifreeze

parameters b*

probes

parameters c*

compressor

parameters D*

defrost

fan

1F eulav level1F sretemarap1F seulav retemarap

Programming and Saving the Parameters (See Figure 1 for Button Locations)

1. Press " " and "sel" for 5 seconds;

Prg

parameters Fn

2. the heating and cooling symbol and the gure "00" are displayed;



3. use " " and " " to set the password and conrm by pressing "sel";



4. use " " and " " to select the parameter menu (S-P) or levels (L-P) and then press "sel";



5. use " " and " " to select the parameter group and then press "sel";



6. use " " and " " to select the parameter and then press "sel";

7. after making the changes to the parameter, press "sel" to conrm or " " to cancel the changes;

8. press " " to return to the previous menu;

Prg

9. to save the modications, press " " repeatedly until reaching the main menu.



Prg

Note:

a. The parameters that have been modied without being conrmed using the "sel" button return to the previous value. b. If no operations are performed on the keypad for 60 seconds, the controller exits the parameter modication menu by timeout

and the changes are cancelled.

c. The appropriate passwords refered to in Step 2 can be found in the right-most column of the chart on the following page.

– 4 –

Page 5

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 2: SCM Field Adjustable Parameters (continued)

SCM Controller

The SCM controller allows the adjustment of heating & cooling setpoints, differentials, and defrosting parameters.

The following chart depicts the factory default values for the most commonly adjusted parameters.

Certain read only parameters are available to evaluate performance or troubleshoot faults. These are accessed through the same parameter menu and are listed below.

DISPLAY DESCRIPTION MIN MAX UOM DEFAULT MEANING PASSWORD

A01 Low Temp Alarm A07 A04 °F 34.0 Water temperature below which the Low Temp alarm A1 will activate 22 A02 Alarm differential 0.3 122.0 °F 4.0 Alarm A1 turns off at A01 + A02 22 A04 Aux heater setpoint A01 r16 °F 36.0 Water temperature below which the pump and electric heater, if present, engage. A05 Differential for aux heater 0.3 50.0 °F 5.0 Pump and heater turns off at A04+A05 22 A07 Antifreeze alarm set point limit -40.0 176.0 °F 32.0 Minimum temperature that A01 can be set to 66 A08 Auxiliary heater set point in heating mode A01 r15 °F 90.0 Water temperature below which the electric heater, if present, engages in heating mode 22 A09 Auxiliary heater differential in heating mode 0.3 50.0 °F 5.0 Electric heater turns off at A08 + A09 in heating. 22

b00 Default display value 0 10 Flag 0 b00 = 0 Displays return water temperature b00 = 01 displays supply water temperature 22 b01 Probe B1 reading - - °F - Read only, real time return water temperature 00 b02 Probe B2 reading - - °F - Read only, real time sys 1 HX leaving water temp 00 b03 Probe B3 reading - - °F - Read only, real time Sys 1 OS coil surface temperature 00 b04 Probe B4 reading - - °F - Read only, real time ambient air temperature 00 b05 Probe B5 reading °F - Read only, real time supply water temperature 00 b06 Probe B6 reading °F - Read only, real time sys 2 HX leaving water temp 00 b07 Probe B7 reading - - °F - Read only, real time Sys 2 OS coil surface temperature 00

c10 Accumulated compressor #1 hours (System 1) - - hrs x 100 - Value x 100 is the accumulated compressor run time in hours 00 c12 Accumulated compressor #3 hours (System 2) hrs x 100 - Value x 100 is the accumulated compressor run time in hours 01 C15 Accumulated pump hours - - hrs x 100 - Value x 100 is the accumulated pump run time in hours 00

d01 Defrost cycle 0 1 Flag 0 Defrost feature currently disabled 22 d02 Defrost logic 0 2 Flag 0 Defrost on timed cycle 22 d03 Start defrosting temperature 0.0 d04 Bar 3.2 Coil temperature below which Defrost initiates 22 d04 End defrosting temperature 0.0 176.0 °F 45 End defrost temperature 22 d06 Min. duration of a defrosting cycle 0 150 Second 60 Minimum defrost duration even if all conditions are satised. 22 d07 Duration of a defrosting cycle 1 150 Minute 5 Time duration of a defrost cycle for one system. 22 d08 Time between defrost cycle 10 150 Minute 45 Run time between defrost cycle starts in one system 22 d09 Delay between two circuits 0 150 Minute 10 Minimum delay between start of defrost of one cuircuit to start of defrost of other circuit 22 d11 Immersion heaters on during defrost 0 1 Flag 1 Turns on electric immersion heater to offset heat loss during defrost cycle. 22 d16 Forced ventilation time at the end of the defrosting 0 360 Second 45 Duration of fan operation at full speed to clear water from coil 66 d17 Defrost with compressors OFF 0 80.0 °F 55.0 Temperature above which defrost occurs with fans only. 66

F02 Fan operating logic 0 2 Flag 1

F05 Temperature for fans off in cooling -40.0 °F 75.0 Coil temperature below which fans turn off (if F02=2) (See Fig 1) 22 F06 Temperature differential to turn fans back on 0.0 50.0 °F 10.0 Fans turn back on at F05+F06 (if F02=2) (See Fig 1) 22

r01 Cooling set point r13 r14 °F 42.0 Primary cooling setpoint (See Fig 3) 00 r02 Cooling differential 0.3 50.0 °F 8.0 Cooling differential/hysteresis 00 r03 Heating set point r15 r16 °F 120.0 Primary heating setpoint (See Fig 5) 00 r04 Heating differential 0.3 50.0 °F 8.0 Heating differential/hysteresis 00 r13 Min. Cooling set point -40.0 r14 °F 36.0 Minimum allowable cooling setpoint 22 r14 Max. Cooling set point r13 176.0 °F 60.0 Maximum allowable cooling setpoint 22 r15 Min. Heating set point -40 -40.0 °F 55.0 Minimum allowable Heating setpoint 22 r16 Max. Heating set point r15 176.0 °F 125.0 Maximum allowable Heating setpoint 22 r17 Cooling compensation constant -5.0 +5.0 °F 0.0 Slope of Outdoor reset curve, Deg water temp/Deg ambient temp. Cooling mode (See Fig 5) 22 r18 Maximum distance from the set point 0.3 20.0 °F 8.0 Maximum deviation from setpoint that can be achieved by outdoor reset (See Fig 5 & Fig 6) 22 r19 Start compensation temperature in cooling mode -40.0 176.0 °F 85.0 Ambient air temp above which Outdoor Reset is active in Cooling (See Fig 5) 22 r20 Start compensation temperature in heating mode -40.0 176.0 °F 30.0 Ambient air temp below which Outdoor Reset is active in Heating (See Fig 6) 22 r31 Heating compensation constant -5.0 +5.0 °F 0.0 Slope of Outdoor reset curve, Deg water temp/Deg ambient temp. Heating mode (See Fig 6) 22

0=Fans on whenever unit is on, 1=both fans on when either compressor is running, 2=both fans on when either compressor is running and coil temp is above threshold

– 5 –

Page 6

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

FAN STATUS

SCM LOW AMBIENT COOLING

SOLSTICE OUTDOOR RESET, COOLING

WATER TEMPERATURE SP,

OUTDO

R RESET, HEA

Section 2: SCM Field Adjustable Parameters (continued)

Figure 3 SCM Fan Speed Control, Cooling

If the fan control logic, parameter F02, is set to 02, the fans will

OFF

F06

F05

OUTDOOR COIL SURFACE TEMPERATURE, °F

Figure 4 SCM Outdoor Reset, Cooling Figure 5 SCM Outdoor Reset, Heating

shut off if the outside coil surface temperature (as read by sensors b03 & b07, whichever is greater) falls to the value established by parameter F05 (75°F, factory default) and remain off until the coil surface temperature rises above F05 plus F06 (75°F + 10°F=85°F, factory default) when the fans will turn on again.

r01

r17 (<0 AS SHOWN)

EMPERATURE SP, °F

WATER

OUTDOOR AMBIENT TEMPERATURE, °F

If the cooling compensation constant, parameter r17, is set to a value other than zero, the water temperature setpoint will be the value established by parameter r01, (42°F factory default) until the outdoor ambient temperature rises to the value of parameter r19 (85°F factory default). Then, as the outdoor temperature continues to increase, the water temperature setpoint will change (increase if r17 is greater than zero, decrease if r17 is less than zero) by the ratio of change in water temperature setpoint to change in ambient temp. For example, if r17 is set to a value of -.5, the setpoint will decrease by 0.5°F for every 1.0°F increase in outdoor ambient temperature. This will continue, until the difference between the new setpoint and the original setpoints matches the value established by parameter

r18 (8.0°F factory default), So the nal setpoint (42°F - 8°F=34°F factory default) will remain xed even if the ambient temperature

continues to rise.

If r17 is set to zero, the water temperature setpoint will remain

xed at the value established by parameter r01 through the

entire range of cooling operation.

r19

r18

°F

r31 (<0 AS SHOWN)

r18

r03

r20

OUTDOOR AMBIENT TEMPERATURE, °F

If the heating compensation constant, parameter r31, is set to a value other than zero, the water temperature setpoint will be the value established by parameter r03, (120°F factory default) until the outdoor ambient temperature falls to the value of parameter r20 (30°F factory default). Then, as the outdoor temperature continues to fall, the water temperature setpoint will change (decrease if r31 is greater than zero, increase if r31 is less than zero) by the ratio of change in water temperature setpoint to change in ambient temp. For example, if r31 is set to a value of

-.5, the setpoint will increase by 0.5°F for every 1.0°F decrease in outdoor ambient temperature. This will continue, until the difference between the new setpoint and the original setpoints matches the value established by parameter r18 (8.0°F factory

default), So the nal setpoint (120°F + 8°F=128°F factory default) will remain xed even if the ambient temperature continues to fall.

If r31 is set to zero, the water temperature setpoint will remain

xed at the value established by parameter r03 through the

entire range of heating operation.

– 6 –

Page 7

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 3: Specications and Ratings

Figure 6 Model SCM rating data

Model SCM - 036 SCM - 060

Heating Capacity 36,840 BTUh (10.8 kW) 52,200 BTUh (15.3 kW)

Heating COP 2.65 2.65

Cooling Capacity 36,000 BTUh (10.5 kW) 48,000 BTUh (14.1 kW)

Voltage 230v/1ph/60Hz 230v/1ph/60Hz

Min Supply Temp 36°F (2.2°C) 36°F (2.2°C)

Max Supply Temp 125°F (51.7°C) 125°F (51.7°C)

Rated Water Flow 10 GPM (37.8 l/Min) 12 GPM (45.4 l/Min)

dP @ Rated Flow 15.8 ft (47.7 kPa) 24.2 ft (72.4 kPa)

Heating Current 18.0 amps 25.6 amps

Cooling Current 16.7 amps 24.8 amps

Noise Level 56 dB (A) 56 dB (A)

Compressor Rotary x 2 Rotary x 2

Installed Weight 354 lbs (161 kg) 407 lbs (185 kg)

All heating data at 47°F ambient, 120°F supply. All cooling data at 95°F ambient, 44°F supply.

Figure 7 Model SCM coding

Typical model

Position 1 2 3 4 5 6 7 8

Designation Unit Type Capacity Series

Values

Examples

Standard equipment

• Heat pump, including two refrigeration systems, factoryprogrammed controller, fans and all required internal components

S C M 0 6 0 A 4

Refrigerant

SCM = SpacePak Heat Pump Module

036 = 3 ton nominal 060 = 5 ton nominal

A = Series “A” 4 = R410A

SCM-036-A-4 = 3 ton nominal, series A, using R410A referigerant, SpacePak Heat Pump Module

SCM-060-A-4 = 5 ton nominal, series A, using R410A referigerant, SpacePak Heat Pump Module

Additional components required

• Pump and piping by others

• Expansion tank, properly sized for system volume

• Powder-coated enclosure

• Auxiliary electric immersion heater (3 kW, 230V/1/60) — requires separate electrical power circuit, 15-amp minimum breaker

type

– 7 –

Page 8

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 3: Specications and Ratings (continued)

SCM-036 HEAT ING PERFORMANCE

HEATING CAPACITY, BTU/hr

SCM-036 COOLING PERFORMANCE

45,000

COOLING CAPACITY, BTU/hr

SCM-036 Heating Operation SCM-036 Cooling Operation

Supply

Water

Temp °F

100

110

120

All data based upon pure water @ 10.0 GPM

Ambient

Temp °F

Capacity

BTU/hr

Water DP

ft WC

17 23,397 12.0 2,742 2.50 32 33,075 12.0 2,801 3.46 95 33,872 12.0 3,528 2.40 47 42,754 12.0 3,008 4.16 105 30,579 12.0 4,497 1.70 17 21,718 12.0 3,190 1.99 32 30,703 12.0 3,258 2.76 95 36,000 12.0 3,750 2.50 47 39,687 12.0 3,499 3.32 105 32,500 12.0 4,100 1.80 17 20,160 12.0 3,710 1.59 32 28,500 12.0 3,790 2.20 95 39,338 12.0 4,522 2.80 47 36,840 12.0 4,070 2.65 105 35,514 12.0 5,822 2.00

Heat Pump SCM036 Series

PERFORMANCE

Watts COP

Supply

Water

Temp °F

Ambient

Capacity

Temp °F

82 36,225 12.0 3,019 3.20

82 38,500 12.0 3,208 3.60

82 42,070 12.0 3,825 3.80

BTU/hr

Water DP

ft WC

Watts COP

45,000

40,000

35,000

30,000

25,000

20,000

15,000

10,000

15 20 25 30 35 40 45 50

SCM-036 Heating Performance

SCM-036 Cooling Performance

40,000

35,000

OUTDOOR AMBIENT TEMPERATURE, °F

All data based upon pure water @10.0 GPM

SupplyWater

Temp °F

120

110

100

4.00

3.00

2.00

Coeffi cient of Performance

1.00

SupplyWater

Temp °F

30,000

25,000

20,000

15,000

80 85 90 95 100 105 110

OUTDOOR AMBIENT TEMPERATURE, °F

All data based upon pure water @10.0 GPM

– 8 –

4.0

3.0

2.0

1.0

Coeffi cient of Performance

Page 9

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 3: Specications and Ratings (continued)

SCM- 060 HEAT ING PERFORMANCE

SCM- 060 COOLING PERFORMANCE

COOLING CAPACITY, BTU/hr

SCM-060 Heating Operation SCM-060 Cooling Operation

Supply

Water

Temp °F

100

110

120

All data based upon pure water @ 12.0 GPM

Ambient Temp °F

Capacity

BTU/hr

Water DP

ft WC

17 33,075 13.5 3,880 2.50 32 46,828 13.5 3,970 3.45 95 45,163 13.5 5,510 2.40 47 60,580 13.5 4,263 4.16 105 34,343 13.5 6,285 1.60 17 30,703 13.5 4,513 1.99 32 43,468 13.5 4,618 2.76 95 48,000 13.5 5,622 2.50 47 56,234 13.5 4,959 3.32 105 36,500 13.5 5,938 1.80 17 28,500 13.5 5,249 1.59 32 40,350 13.5 5,371 2.20 95 52,451 13.5 5,485 2.80 47 52,200 13.5 5,768 2.65 105 39,885 13.5 5,840 2.00

Heat Pump SCM060 Series

PERFORMANCE

Watts COP

Supply

Water

Temp °F

Ambient

Capacity

Temp °F

82 54,102 13.5 5,281 3.00

82 57,500 13.5 5,262 3.20

82 62,832 13.5 5,411 3.40

BTU/hr

Water DP

ft WC

Watts COP

64,000

56,000

48,000

40,000

32,000

HEATING CAPACITY, BTU/hr

24,000

16,000

15 20 25 30 35 40 45 50

64,000

56,000

SCM-060 Heating Performance

OUTDOOR AMBIENT TEMPERATURE, °F

All data based upon pure water @12.0 GPM

SCM-060 Cooling Performance

13.00

SupplyWater

Temp °F

120

110

100

5.00

4.00

3.00

2.00

1.00

Coeffi cient of Performance

SupplyWater

Temp °F

48,000

40,000

32,000

24,000

16,000

80 85 90 95 100 105

OUTDOOR AMBIENT TEMPERATURE, °F

All data based upon pure water @12.0 GPM

– 9 –

4.0

3.0

2.0

1.0

Coeffi cient of Performance

Page 10

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 4: Dimensions

Figure 8 Model SCM dimensions (ALL DIMENSIONS IN INCHES)

A B D D1 D2 E F G H J K W W1 W2

Model

SCM-036

SCM-060

Leg

Front to

height

return

1 10 17

Cabinet

depth

Mounting

lug

depth

Mounting

lug

centers

Bottom

return

Bottom

supply

– 10 –

Base to

bottom edge

of lower fan

Overall

Height

Return

connec-

25 53 1" NPT 1" NPT 43

tion

Supply

connec-

tion

Overall

width

Mounting

lug

centers

Lug

center

to edge

Page 11

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 5: Location & Mounting

Failure to comply with all of the guidelines

IN THE FOLLOWING could result in death,

serious injury or substantial property damage.

The installation must comply with all applicable

local codes.

Prepare the unit

• Inspect the unit for shipping damage. DO NOT use if there is a risk that the damage could affect unit operation.

• Make sure all required components are available.

• Install optional immersion heater, if used. See instructions provided with the heater.

Location

• DO NOT locate where the unit could be sprayed by sprinklers.

• DO NOT locate near swimming pools, spas or any location that could cause chlorine or other contaminant to enter the unit.

• DO NOT locate where water run-off from adjacent structures could impinge on the unit.

• Maintain the clearances shown in Figure 10.

• LOW AMBIENT conditions — Contact SpacePak Technical Support to obtain low ambient adjustment instructions if cooling operation below 55°F is required.

• CORROSIVE ENVIRONMENTS — Do not install the unit in an area subject to sea air or other potential corrosive contaminants.

• INDOOR INSTALLATION — If the unit is installed inside a building, the building must be equipped with air openings

sufcient to ensure free discharge of heated (or cooled) air

generated by the heat pump. All clearances must be

maintained to ensure free air ow into and out of the

enclosure. Make sure no other equipment located in the

space will be affected by the unit’s air ow.

Handling

• See Figure 9.

• Place padding at pressure points to prevent damage to the enclosure.

• Use caution when handling. The unit is heavy and could cause severe injury or damage if dropped or handled incorrectly.

Figure 9 Handling with cables

Figure 10 Maintain clearances below

Minimum clearances (inches)

S T U V

20 59 40 20

Mounting pad

• The SpacePak heat pump must be mounted on a level, corrosion and weather-resistant mounting surface, preferably concrete. The structural support must be suitable for the operating weight of the unit and attached components, its mounting pad, snow loading and any other expected loads.

• The mounting pad must not be attached directly to a structure where noise transmission can occur.

• Vibration isolators supplied with the heat pump may be installed when desired to reduce transmitted vibration.

• The unit must be bolted securely to the pad. Where required by local jurisdiction, the mounting must also be analyzed for seismic loading capability.

• The mounting must ensure that there will be no debris

accumulation which might block air ow through the

enclosure openings. The lower edge of the lower fan opening must be above the typical snow line, including allowance for drifting.

• There must be no accumulation of water that could reach the bottom of the unit’s enclosure.

– 11 –

Page 12

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 6: Recommended Piping Diagram

BACKFLOW-PREVENTION

Figure 11 SpacePak heat pump with single air handler (See Section 7 for instructions)

RETURN FROM TERMINAL UNIT(S)

SUPPLY TO TERMINAL UNIT(S)

BUFFER TANK

DRAIN VALVE SHOULD BE LOCATED AT LOWEST POINT IN PIPING SYSTEM

AUTOFILL LOCATION IS SUGGESTED, BUT THE FINAL LOCATION TO BE MADE BY FIELD CONTRACTOR

SCM HEAT PUMP

SPL-WG0994-01_A

CIRCULATOR

DRAIN VALVE

BALL VALVE

STRAINER

EXPANSION TANK

AUTOMATIC AIR VENT

VALVE

PRESSURE RELIEF VALVE

PRESSURE GAGE

PRESSURE REDUCING

DEVICE

VALVE

– 12 –

Page 13

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 7: Glycol/Water System

Figure 12 SCM Glycol Concentrations (10% Minimum, 50% Maximum)

Ethylene Glycol % 10 20 30 40 50 Min. Ambient Temp for Operation 23°F/-5°C 14°F/-10°C 2°F/-17°C -13°F/-25°C -36°F/-38°C SpacePak Capacity Multiplier 0.98 0.96 0.93 0.91 0.89 Pressure Drop Multiplier (Cooling) 1.06 1.12 1.16 1.25 1.36 Pressure Drop Multiplier (Heating) 1.06 1.12 1.16 1.22 1.28 Minimum Expansion Volume / System Volume Heating and Cooling (Gallons) 1 gallon expansion per 15 gallons system volume Heating only, HP only (Gallons) 1 gallon expansion per 20 gallons system volume Heating Only, with Boiler (Gallons) 1 gallon expansion per 15 gallons system volume

Propylene Glycol % 10 20 30 40 50 Min. Ambient Temp for Operation 26°F/-3°C 18°F/-8°C 8°F/-13°C -7°F/-22°C -29°F/-34°C SpacePak Capacity Multiplier 0.99 0.98 0.96 0.93 0.88 Pressure Drop Multiplier (Cooling) 1.10 1.20 1.34 1.5 1.65 Pressure Drop Multiplier (Heating) 1.10 1.20 1.34 1.46 1.5 Minimum Expansion Volume / System Volume Heating and Cooling 1 gallon expansion per 15 gallons system volume Heating only, HP only 1 gallon expansion per 20 gallons system volume Heating only, with Boiler 1 gallon expansion per 15 gallons system volume

Figure 13

Piping Pressure Losses*

Pressure Drop, Ft water/100Ft

Flow rate GPM 1" 1-1/4" 1-1/2" 2"

Pex Pipe

10 13.4 5.2 2.4 0.6 11 15.9 6.2 2.8 0.7 12 18.5 7.2 3.2 0.9 14 24.4 9.4 4.2 1.2

Copper Pipe (Type L)

10 7.1 2.6 1.1 0.3 11 8.4 3.1 1.3 0.3 12 9.9 3.6 1.5 0.4 14 13.2 4.8 2 0.5

*Remember to check the CV rating of your ttings and valves to make sure your getting the correct ow through the equipment.

Glycol/Water System Design

Each SCM Heat Pump has a recommended ow that should be

maintained during all times of operation. For the SCM-036, the

recommended ow is 10 GPM, at which the head loss through the

heat exchanger is 15.8 ft. WC, 6.8 PSI or 47 kPa. For the SCM-

060, the recommended ow is 12 GPM, at which the head loss

is 24.2 ft. WC, 10.4 PSI or 72 kPa. These head loss values are based upon pure water, see Figure 12 for multipliers to correct for various concentrations of anti-freeze solution.

Note: these are the recommended ow values. Should the ow drop signicantly below this value, the heat pump will shut down

and display the code FL on the display. This is not an indication

of a fault in the heat pump, but rather points to insufcient pump

or plumbing capacity, or air trapped within the system.

System Volume and Expansion Volume

To ensure smooth temperature control and minimize cycling of refrigeration system, all installations must have total circulating volumes equal to or greater than 7-1/2 gallons per nominal ton of the unit performance (The greater of either heating or cooling produced). In other words, in the case of a four ton heat pump the minimum total system volume is 4x7-1/2=30 gallons. Multiple heat

pump installations that are operating in a staged conguration follow

the same rule, so that only a single heat pump tonnage needs to be considered. Additionally, the system requires an expansion volume (air) to compensate for the change in volume of the glycol mixture as it heats and cools, see Figure 12 for expansion volume.

A typical multiple heat pump installation may actually have a volume far greater than the minimum required, and it is this entire volume that must be considered when sizing the expansion tank.

Note that the nominal expansion tank volume is not the same as the expansion volume. If the actual air volume is not published, consider it to be no more than half the nominal volume.

As an example, a four ton nominal heat pump, used for both heating and cooling, requires a minimum of thirty gallons of circulated system volume. A 40 gallon buffer tank is selected for best operation. When the system installation is complete, the total liquid volume of plumbing, air handlers, and heat pump is 45 gallons. (Note the expansion tank, no matter how large, is not considered circulated volume) This requires an acceptance

volume of 3 gallons. If the acceptance volume is not specied,

assume it is 50% of the total volume. Therefore, this system would require an expansion tank of 3 gallons acceptance volume, or six gallons nominal full volume.

Air Separator

Locate at least one high efciency air separator as shown in the

piping to remove any air from the system.

Glycol / Water Mixture

The water system must contain a mixture of

inhibited glycol and water with thermal protection

sufcient for the coldest expected temperature for

the installation. The inhibitor level can degrade over time, and may need to be adjusted periodically. The inhibitor is essential to prevent the glycol from accelerating corrosion of metal components in the system. The glycol and inhibitor levels must be checked regularly (no less than once annually).

The minimum allowable concentration of glycol is

10% by volume in all installations.

Automotive glycol is not suitable for use in the LAHP

system. Over time it may leave deposits which will degrade the performance and damage pumps or other devices in the system. Use only ethylene

glycol or propylene glycol mixtures specically

labeled for boiler or HVAC use.

– 13 –

Page 14

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 7: Glycol/Water System (continued)

Glycol/Water System Installation

Obtain all components specied in Figure 11. Make sure all

components and piping comply with applicable local codes.

DO NOT use galvanized pipe anywhere in the system. Galvanizing will react with the glycol and can cause glycol degradation and sludge in the system.

• Conrm charge of expansion tank is 12-15 PSIG (with no

water or pressure in the system).

• Install the system piping. DO NOT connect the SpacePak unit to the system piping until the system has been cleaned as required below.

The SCM must NOT be connected to the system during this process.

1. Connect a hose from a fresh water supply to the system ll

hose bib. Note the drain port can be used for this purpose. The hose bib purge/drain valve should be located low in the system and close to the SCM return connection.

2. Open the high point purge valve, (not shown in illustration, as

it may be inside the air handler) while slowly lling the system.

Close the valve when air is removed from the system and

water begins to ow out of the valve.

3. Fill the system with fresh water and run water until the system

has been thoroughly ushed clean.

Automatic Fill – When an automatic ll system is installed, the cooling uid (Glycol/water) must be inspected at least every 3

months, or whenever a leak is detected to ensure the proper glycol concentration is maintained.

Pressure Test The System

1. Add water to the system as needed to raise the pressure to 25 PSIG (verify that all system components are suitable for this pressure). Verify that the pressure remains constant for at least one hour. Locate and correct any leaks.

2. After successfully testing, drain the system and remove the fresh water hose.

Insulate The Piping

1. After testing and draining the system, apply pipe insulation. Fill system with glycol/water mixture. Calculate the system volume.

2. See Figure 12, for required glycol concentration for the minimum expected outside temperature.

3. Obtain the required volume inhibited glycol/water solution premixed or mix in a clean container. (The glycol must contain an inhibitor to prevent metal corrosion.)

4. Pump the glycol/water solution into the system, allowing air to escape through the purge valve(s).

5. After lling the system, sample the system uid and verify

glycol and inhibitor percentages, following instructions provided with the glycol.

The electrical loads given in Figure 1, allow for a pump load of no more than 5 amps at 110 VAC (2.5 amps at 230 VAC). If the pump load exceeds this, provide a separate power source to the pump. DO NOT feed power to the pump from the SpacePak air handler panel.

• Provide a separate power source and overcurrent protection for the immersion heater. Refer to the Figures 18 and 19 of this manual for detailed wiring.

SCM Control Wiring Connection

The SpacePak SCM requires a dry contact (relay) signal to enable and select between heating and cooling modes. They will not operate on the 24V signals from typical thermostats or air handlers. Connecting 24V to either of these points will result in

erratic operation and may cause signicant component damage.

• Connect single zone systems to heat pump as shown in Figure 16.

• Connect multiple zone system to heat pump using SpacePak SSIC Control Module and instructions included with it. to manual supplied with SSIC Control Module for connection and operational details.

• See Figure 19, for heat pump electrical ladder diagram. Section 9: Electrical Diagrams.

Refer

Low Ambient Temperature Cooling Operation

If cooling operation is desired in a year-round application, or any time outdoor temperatures are expected to be consistently

below 55˚F, the fan operation should be modied in order to

ensure proper operating conditions within the refrigeration system. Refer to Section 2, Fig. 3, for instructions.

Note once implemented, this will cause the fans to start and stop periodically during operation. This is normal behavior during cooler outdoor temperatures and should not be a concern.

– 14 –

Page 15

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

DRAIN VALVE

Section 8: Start-up and Test

Figure 14

PURGE VALVE

(MANUAL)

See the above illustration; note this is not intended to include all components in the system, just the minimum to properly purge air from the heat pump.

1. With the heat pump isolated and dry, valves A & B closed, charge the “system”(that is, all the plumbing not shown), and remove as much air as possible through the air separator.

2. Apply a static pressure to the system, with all pumps off, of 15-25 PSI.

3. Very gradually open the lower ball valve, B, to allow water un-

der pressure to begin to ll the heat pump from the bottom.

4. Crack the manual vent valve until you hear air escaping.

5. Allow the water to continue to ll the heat pump, displacing air.

This should go very slowly, and could take a minute or more.

6. When all the air has been displaced and a steady stream of

water is owing out of the vent valve, fully open ball valve B.

7. Open ball valve A, a small amount of air might escape the vent valve from the heat pump supply line.

8. When all the air has escaped, close the vent valve.

Note, this procedure lls the heat pumps in the opposite direction of normal ow, so it must be done when all pumps are off.

BEFORE starting the unit

Electrical shock hazard — Disconnect all electrical

power before proceeding with the following.

1. Verify that the system and all components have been installed in accordance with this manual and all applicable codes and instructions.

2. Inspect the SpacePak heat pump and all other system components. All components should be in good condition and operational.

3. Inspect the water piping for any signs of leakage. Repair all system leaks. Leakage will cause pressure

to drop, preventing the heat pump from operating. Leaks also allow introduction of excess make-up

water, whether lled automatically or manually.

4. Check system pressure. The pressure should be at least

15 PSIG with heat pump not in operation.

5. Check all wiring connections to ensure terminal connections

are tight and all wiring is in place.

Start the SpacePak heat pump

Start in cooling mode.

1. Apply power to the unit

2. The display (Figure 1) should show the start sequence —

uC2, then 2.0, then the current water temperature. No other symbol should appear.

3. When the display shows only temperature, lower the

thermostat setpoint below the current room temperature.

4. This begins a call for cooling, and the pump symbol will begin

to ash.

5. After 1 to 2 minutes, the pump symbol will change to constant

display, and the pump will begin circulating.

6. Assuming the water is outside of the cooling temperature

range (above 42°) the refrigeration system will initiate and

the 1, or 3, or both numerals will begin ashing.

7. After 1 to 2 minutes, the 1, or 3, or both numerals will change

to constant, the compressor symbol will turn on and one or both compressors will start.

8. Observe for any alarms, errors, or faulty operation (noises,

vibration, etc)

9. When operation is deemed satisfactory, raise the thermostat

set-point or turn it off.

10. The pump will run for approximately two minutes after the

compressor shutdown.

Start in heating mode.

1. When the pump has stopped, change the thermostat to Heat-

ing (if applicable) and raise the set point above current room temperature.

2. This initiates a call in Heating mode. The pump symbol will

begin ashing.

3. After 1 to 2 minutes, the pump symbol will change to constant

display, and the pump will begin circulating.

4. Assuming the water is outside of the heating temperature

range (below 120°) the refrigeration system will initiate and

the 1, or 3, or both numerals will begin ashing.

5. After 1 to 2 minutes, the 1, or 3, or both numerals will change

to constant, the compressor symbol will turn on and one or both compressors will start.

6. Observe for any alarms, errors, or faulty operation (noises,

vibration, etc).

– 15 –

Page 16

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 8: Start-up and Test (continued)

Anti-freeze cycle

1. Should the water temperature drop to 34°F during periods of non-use, the pump will start and the antifreeze heater (if connected) will energize and continue to operate until the temperature reaches 38°F.

2. If the water temperature continues to fall and reaches 33°F, the Alarm symbol and Fault Code AL will be displayed, and the unit will automatically start in heating mode. It will continue to run until the water temperature reaches 38°F.

3. NOTE: This provides the maximum level of protection in all cases, but may use energy unnecessarily when a suitable concentration of glycol anti-freeze is installed. When freeze

protection is sufcient, these value can be adjusted to

lower temperatures. Contact technical support for guidance

in re-conguring these parameters, however it must be

understood that the installer is responsible for ensuring

sufcient freeze protection to the lowest temperature allowed.

24-Hour follow-up

Approximately 24 hours after start-up and testing, return to the installation to verify proper operation. Perform the following checks.

1. Check system pressure. Add additional glycol/water mixture if needed to restore pressure. (Pressure can drop as air is removed from the system by the air vents.)

2. Sample the glycol/water mixture in the system. Verify inhibitor and glycol levels.

3. Inspect the piping and components to ensure there are no leaks. Repair any leaks immediately.

4. Close the isolation valves on either side of the y-strainer at the SpacePak heat pump return connection. Remove the screen and inspect for sediment. Clean if necessary.

• If the strainer has become clogged with sediment, determine

whether the system needs to be drained, cleaned and re-

lled. Excessive sediment accumulation in the strainer will reduce ow and cause the unit to shut down.

5. Cycle the system on heating and cooling. Verify that all components operate correctly.

B. Heat boost: When the heat pump is operating in heating

mode, the Carel controller will call for the heater to be energized when the water temperature falls below the value of parameter A08, again controlled by the TDR. Parameter A09 is a differential value, such that the heaters will shut off when the temperature reaches A08 + A09.

C. Defrost operation: When enabled, via parameter d11 being set

to a value of 01, the controller will call for the heater to energize, after the TDR duration, whenever the defrost cycle is active.

Time Delay Relay

In all instances, the heaters receive power only after a time interval, controlled by the TDR. See Figure 15. The TDR can be adjusted to provide a delay from .01 second, to 100 hours. This is accomplished by two dials on the face of the components. The lowed dial establishes the range, in increments of 0.1 second, 1 second, 6 seconds, 60 seconds, 0.1 hour, 1 hour, and 10 hours. The upper dial is the multiplier, and increased the range from 1 to

10 times. The factory default is 10 minutes as shown in the gure;

the range is 60 seconds, and the multiplier is 10. This may be excessively long for most applications, and may be adjusted to a shorter interval, especially if it is primarily used for defrost operation.

When the TDR receives a signal from the controller, the Coil

LED will begin to ash, and continue for the duration of the time

delay. Once the delay has expired, the Coil LED will change to solid, and the Contact LED will illuminate also. When the signal is removed from the TDR, the contact will open immediately.

Protection

The heater circuit must rst prove water ow before energizing

the heaters, and maintain a circuit through an overtemp protection device (located within the heater element) which opens at 201°F. Should either of these conditions fail, the heaters will immediately de-energize.

Heater Capacity

The internal circuit and switching is sufciently robust to carry the

load of the 3kW internal heater, or the (2) 3kW heaters within the available BT-H series buffer tanks, but it cannot power all three heaters. Therefore, the internal heater must be disconnected from power when connecting buffer tank heaters.

Electric Heat

The SCM series heat pumps are equipped with integral 3 kW electric heater elements contained within the water circuit. These are powered by a 230VAC input (separate from the heat pump power) and must have individual protection, (minimum 15A)

The heater function is managed by the Carel μC2 controller, and

it provides three different functions, all of which are adjustable via the Display Keypad.

A. Freeze protection: When the heat pump is in standby,

it monitors the temperature of the water circuit. If the temperature falls below the value of parameter A04, the controller will start the circulator, and send a call for the heaters to energize. The heaters are powered through a Time

Delay Relay (TDR), to ensure ow is established before the

heaters come on. Parameter A05 is a differential value, such that the heaters will shut off when the temperature reaches A04 + A05.

Figure 15

– 16 –

Page 17

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 9: Electrical Connections

The electrical installation must comply with the latest edition of: in the U.S. — National Electrical Code ANSI/NFPA No. 70; in Canada — CSA C22.1 Canadian Electrical Code Part 1. Wiring must be N.E.C. Class 1. Use only copper wire, rated for 120°F and sized for the load listed in this manual.

Electrical shock hazard — Disconnect

all electrical power before servicing the unit. Also, the unit must be grounded in accordance with the Electrical Code listed above.

Overcurrent protection & wire sizing

• Protect each circuit with a breaker or fuse rated for the load given in Figure 1.

The electrical loads given in Figure 1,

page 3 allow for a pump load of no more than 5 amps at 110 VAC (2.5 amps at 230 VAC). If the pump load exceeds this, provide a separate power source to the pump. DO NOT feed power to the pump from the SpacePak air handler panel.

• Provide a separate power source and overcurrent protection for the immersion heater. Refer to the Figures 18 and 19 of this manual for detailed wiring.

Figure 16 SpacePak Heat Pump eld wiring — SINGLE air handler

(See Figure 19 for ladder wiring diagram)

(SCC-1)

SpacePak heat pump wiring

The SpacePak SCM heat pumps require

a dry contact (relay) signal to enable and select between heating and cooling modes. They will not operate on the 24V signals from typical thermostats or air handlers. Connecting 24V to either of these points will result in erratic operation

and may cause signicant component

damage.

• Connect single air handler to heat pump as shown in Figure 16.

• Connect multiple air handlers to heat pump via SpacePak heat pump Interface Module as shown in Figure 17.

• See Figure 19, for heat pump electrical ladder diagram.

– 17 –

Page 18

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 9: Electrical Connections (continued)

Multiple air handler applications

•

For multiple air handler applications, provide a zone

valve or pump to control water the ow to the air

handler.

• When the zone thermostat activates the SCM, the valve will be activated by the SpacePak air handler.

• The total zone control load must not exceed 20 VA at 24 VAC. If a larger valve or zone pump is used, it must be switched by a power relay controlled from the 24 VAC output of the air handler.

• Refer to manual supplied with SSIC module for connection and operational details.

Figure 17 SpacePak Heat Pump eld wiring — Multiple air

handlers (see Figure 19 for ladder wiring diagram)

(SSIC)

– 18 –

Page 19

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 9: Electrical Connections (continued)

Figure 18 SpacePak Heat Pump — Pictoral wiring diagram

– 19 –

Page 20

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 6: Electrical Connections (continued)

Figure 19 SpacePak Heat Pump electrical ladder diagram

– 20 –

Page 21

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 10: Troubleshooting

Figure 20 Troubleshooting suggestions

Condition Possible Causes Verication Solution

Incorrect power supply Check power supply Supply correct power

Unit will not start

Compressor running - insufcient cooling/

heating

High compressor discharge pressure in cooling

High compressor discharge pressure in heating

Low compressor suction pressure in cooling

Compressor will not run

Noisy compressor

Fan will not run

Compressor runs - no heating/cooling

Low outlet glycol/water temperature in cooling

Loose or broken wires Check wiring

Circuit breaker interrupted Check for short

Insufcient pipe insulation Check insulation Add/repair insulation

Dirty coil Check coil Clean Coil

Low water ow Look for alarm symbol and FL fault code

Dirty coil Check coil Clean Coil

Low water ow

Insufcient/no water ow Look for alarm symbol and FL fault code

Cooling operation in low ambient

Power supply failure Supply correct power

Failed compressor contactor Replace contactor

Loose power cable Check power cable Tighten power cable

Compressor limit exceeded

Incorrect return water temperature setting Check return water temperature setting Adjust return water temperature setting

Low glycol/water ow Look for alarm symbol and FL fault code

Liquid returning to compressor

Compressor failure

Fan relay failure Replace fan relay

Fan motor failure Replace fan motor

No refrigerant charge Check for leaks Add appropriate refrigerant

Damaged heat exchanger

Compressor failure Replace compressor

Improper temperature control setting

No load/rapid temperature drop

Measure water ow through heat

exchanger

Conrm outdoor ambient is lower than

typical for cooling operation, e.g. <55°

Check for compressor symbols 1 and/or

3. If symbol is displayed but compressor is inactive, thermal overload has been tripped.

Check for glycol/water leaks and/or refrigerant leaks

Check cooling temperature setpoint and differential

Ensure compressors are allowed to run a minimum of three minutes before reaching desired temperature

Repair or replace wiring

Clean strainer screen

Clear blockage

Remove air in piping

Verify operation/condition of water pump

Flow should be a minimum of 10 GPM for SCM060 or 8 GPM for SCM036

Clean strainer screen

Clear blockage

Remove air in piping

Verify operation/condition of water pump

If low ambient cooling is desired, refer to Section 7.

This will reset, however root cause must be determined

Clean strainer screen

Clear blockage

Remove air in piping

Replace compressor

Replace heat exchanger

Contact Technical Support for instructions to reset cooling setpoints

Verify cooling fuction when there is

sufcient heat load to allow continuous

operation.

– 21 –

Page 22

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 10: Troubleshooting (continued)

Figure 21 Troubleshooting suggestions (continued)

Condition Possible Causes Verication Solution

Low outlet glycol/water temperature in heating

Low glycol/water ow

Dirty coil, damaged or improperly operating fans

Extremely low ambient temperature

Damaged or blocked plumbing or air handler

Defective or improper pump

Visually inspect coil condition and fan operation

Heating performance falls considerable as temperatures drop below 20-25°F

Check for blockage and/or air in piping, check operation/condition of water pump

Verify pump operation/condition. Measure

water ow through the heat exchanger

Clean coil, repair fan blade or motor as necessary.

Install supplemental heating for extreme low ambient conditions.

Clean strainer screen

Clear blockage

Remove air in piping

Replace or re-size pump to obtain a minimum of 10 GPM for SCM060 or 8 GPM for SCM036

Figure 22 Fault codes

Alarm

Display

A1 Freeze warning, system 1 Automatic Stop None Stop Enable

A2 Freeze warning, system 2 Automatic Stop None Stop Enable

Aht High water temp at startup Automatic Stop None Stop None

dF1 Defrost error, cycle time exceeded Automatic None None None None

E1 Return water temp sensor fail Automatic Stop None Stop Stop

E2 System 1 HX temp sensor fail Automatic Stop None Stop Stop

E3 System 1 OS coil temp sensor fail Automatic None None None None

E4 Ambient air temp sensor fail Automatic Stop None Stop None E5 Refrigerant pressure sensor fail Automatic Stop None Stop None E6 System 2 HX temp sensor fail Automatic Stop None Stop Stop

E7 System 2 OS coil temp sensor fail Automatic Stop None Stop None

ESP Lost com. with expansion module Automatic Stop Stop Stop Stop

FL Water system low ow Automatic Stop Stop Stop Stop

Hc1 Service hours notication Automatic None None None None

HP1 Sys 1 refrigerant High Pressure fault Auto x3, then Manual Stop None Run 60 sec None

HP2 Sys 2 refrigerant High Pressure fault Auto x3, then Manual Stop None Run 60 sec None

Ht High water temp Automatic None None None None

LHt Low Water temp at startup Automatic Stop None Stop None

LP1 Sys 1 refrigerant Low Pressure fault Auto x3, then Manual Stop None Run 60 sec None

LP2 Sys 2 refrigerant Low Pressure fault Auto x3, then Manual Stop None Run 60 sec None

Alarm Type Reset Logic

Compessor

Response

Pump

Response

Fans

Response

Heater

Response

– 22 –

Page 23

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 11: Annual Maintenance

Perform Annual Inspection Glycol/water mixture

The water system must contain a mixture of

inhibited glycol and water with thermal protection

sufcient for the coldest expected temperature for

The minimum allowable concentration of glycol is

10% by volume in all installations.

Automotive glycol is not suitable for use in the heat

pump system. Over time it may leave deposits which will degrade heat pump performance and damage pumps or other devices in the system.

Use only ethylene glycol or propylene clycol

mixtures specically labeled for boiler or hvac use.

1. At least once annually, sample the system uid to verify that

the glycol concentrations meets the minimum value given in Figure 12. Also test the inhibitor concentration. Add glycol and inhibitor as needed to return the system to the correct concentrations.

2. Perform any and all other tests as recommended by the anti-freeze manufacturer’s instructions in order to ensure optimal performance and maintain warranty protection on all installed components.

Check operating pressure

1. Check the glycol/water system pressure. Operating pressure

should be between 15 and 25 PSIG. Adjust uid volume if

needed to restore pressure.

2. If pressure is low, check system for evidence of leaks. Repair all leaks immediately.

4. Close the isolation valves on either side of the y-strainer at the SpacePak heat pump return connection. Remove the screen and inspect for sediment. Clean if necessary.

• If the strainer has become clogged with sediment,

determine whether the system needs to be drained,

cleaned and re-lled. Excessive sediment accumulation in the strainer will reduce ow and cause the unit to shut

down.

5. Inspect all wiring and wiring connections. Tighten connections if needed. Correct any problems found.

6. Check the fuses or breakers to ensure they are correctly sized and properly installed.

7. Clean the SCM heat exchangers and air openings.

8. Cycle the system on heating and cooling. Verify that all components operate correctly.

Preparing the SCM for shut down

DO NOT turn off power to the SCM heat pump in

the winter or any time when there is a possibility of freezing. Power must be ON for the automatic antifreeze operation to occur. See information below for preparing the unit for shut down.

1. When the water temperature drops below 34°F during periods of non-use, the pump will start and the antifreeze heater (optional, when installed) will energize and continue to operate until the temperature reaches 38°F.

2. If SCM must be turned off or left idle during periods when freezing is possible, one of the following must be done:

a. Verify that sufcient glycol solution is present to protect

against most extreme anticipate conditions

b. — OR — Drain heat pump and external piping completely

To restart after shutdown

1. If unit was drained, rell.

2. Follow start up procedure from Section 8.

Perform annual inspection

Electrical shock hazard — Disconnect all electrical

power before proceeding with the following.

1. At least once annually, perform a complete inspection of the system, including at least the following.

2. Inspect the SCM for signs of dirt or debris accumulation. Remove any debris and notify the building owner that the unit must be kept clean and unobstructed.

3. Inspect glycol/water system piping and components. Repair or replace any defective components. Repair all leaks immediately.

– 23 –

Page 24

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Figure 23 Replacement parts

PART NUMBER DESCRIPTION VENDOR PART NUMBER

SCM036 SCM060

45R20000-320009 Carel Temperature Sensor, 10K NTC015WP00 (IP68,-55F to 212F, 5 Ft., 10K Ohm)

45R20000-360006 Compressor Contactor HCC -1NU04A A

45R2000-3136 Fan Motor Controller CONVON/OFF

45R2000-3137 Carel Expansion Board MCH2000020

45R2000-3138 Carel Controller MCH2000010

45R2000-3157 Soft Start PCB 2000-3157

45R2000-3501 Fan Motor Capacitor CBB61 (35μF/450VAC)

Section 12: Replacement Parts

45R2000-3603

45R2000-3606 Flow Switch HF68P/1"NPT

45R2000-3619 Relay, Circulator JQX-105F-4 (220-240V, 30A)

45R20000-370011 Transformer (220-230V to 11.5V 600mA) 41X26.5F (220~230VAC,50/60Hz, 11.5VAC,0.6A)

45R2001-3605

45R2001-3608

45R20000-140456 45R20000-140449 EEV SPF-16D32 (9.5kW)

45R2004-1437 4-Way Valve C03C01S/SHF-9H-35U / STF-0203G (R410A)

45R20000-330124 Fan Motor YY060-1206P01-004

45R3500-2701 Fan Blade 440×152 AS+20%GF

45R20000-110097 Compressor ATH290RN-C9LU

45R20000-110068 Compressor PA200M2CS-3MUU1

45R2000-3504 Compressor Capacitor CBB65 (35μF/450V)

45R2000-3505 Compressor Capacitor CBB65 (50μF/450V)

45R35018-120010 Tube in Shell Heat Exchanger GAH04-CM×2

Pressure Switch (0.30MPa/0.15MPa ± 0.05)

Pressure Switch (3.2MPa/4.4MPa ± 0.15)

Pressure Switch (2.8MPa/3.6MPa ± 0 .15 )

H20PS (0.02MPa/0.15MP)

H20PS (3.2MPa/4.4MPa)

H20PS (2.8MPa/3.6MPa)

45R35 018 -120012 Tube in Shell Heat Exchanger GAH03-CMF×2

45R35036-120011 Finned Coil Heat Exchanger 3 rows, Φ7.94mm

45R35 03 6-120012 Finned Tube Heat Exchanger 3 rows, Φ7.94mm

45R40000-120006 Finned Tube Heat Exchanger 2 rows, Φ7.94mm

45R40000-120007 Finned Tube Heat Exchanger 2 rows, Φ7.94mm

45R20000-000025 Immersion Heater Element 240 VAC 3kW

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Page 25

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

SCM036/060 Heat Pump Start Up Instructions

Job Name:_________________________________________________

Job Address:_______________________________________________

Contact Phone:_____________________________________________

Model #:_____________________ Serial

#:_______________________ Start Up Performed

By:_____________________Date:_____________

After powering up the unit, the following steps must be followed:

START UP IN COOLING MODE

____ Display start sequence will read uC2, then 2.0, then the current water temperature

 If only temperature is displayed, lower the thermostat setpoint below the current

room temperature

____ Pump symbol will begin to flash as a call for cooling is made

____ After 1-2 minutes pump symbol will remain constant

____

____ After 1-2 minutes the 1, 3, or both numerals will remain constant, the compressor

____ Observe for any alarms, errors, or faulty operation (noise, vibration etc)

____ When operating sufficiently, raise thermostat set-point or turn it off

____ Pump will run for approximately 2 minutes after compressor shutdown

Once water is outside the cooling temperature range (above 42°F) the refrigeration system initiates and the 1, 3, or both numerals will begin flashing

symbol will come on and one or both compressors will start

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Page 26

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

START UP IN HEATING MODE

____ Once pump has stopped, change the thermostat to Heating (if applicable) and raise the

set point above the current room temperature.

____ Pump symbol will being to flash as a call for heat is made

____ After 1-2 minutes pump symbol will remain constant

____

Once water is outside the cooling temperature range (below 120°F) the refrigeration system initiates and the 1, 3, or both numerals will begin flashing

____ After 1-2 minutes the 1, 3, or both numerals will remain constant, the compressor

symbol will come on and one or both compressors will start

____ Observe for any alarms, errors, or faulty operation (noise, vibration etc)

24 HOUR FOLLOW UP

24 Hours after start up the following checks should be performed:

____ Check System Pressure (add glycol/water mixture if needed to restore pressure)

____ Sample and verify glycol/water mixture

____ Inspect all piping and components for leaks

____ Close isolation valves on either side of the y-strainer at the heat pump return

connection

____ Remove the screen and inspect for sediment, clean if necessary

 If the strainer is clogged determine if system needs to be drained and re-filled.

Excessive sediment buildup will cause reduced flow and the system will shut down

____ Cycle the system in both heating and cooling

____ Verify that all components operate correctly

– 26 –

Page 27

Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual

Section 13: LIMITED WARRANTY

Air to Water Reverse Cycle Heat Pump

The “Manufacturer” warrants to the original owner at the original installation site that the Air to Water Reverse Cycle Heat Pump (the “Product”) will be free from defects in material or workmanship for a period not to exceed one (1) year (parts) or two (2) years (compressor) from the startup. If upon examination by the Manufacturer the Product is shown to have a defect in material or workmanship during the warranty period, the Manufacturer will repair or replace, at its option, that part of the Product which is shown to be defective.

This limited warranty does not apply:

a) if the Product has been subjected to misuse or neglect, has been accidentally or

intentionally damaged, has not been installed, maintained or operated in accordance

with the furnished written instructions, or has been altered or modied in any way.

b) to any expenses, including labor or material, incurred during removal or reinstallation of

the defective Product or parts thereof.

c) to any workmanship of the installer of the Product.

This limited warranty is conditional upon:

a) shipment, to the Manufacturer, of that part of the Product thought to be defective. Goods

can only be returned with prior written approval from the Manufacturer. All returns must be freight prepaid.

b) determination, in the reasonable opinion of the Manufacturer, that there exists a defect

in material or workmanship.

Repair or replacement of any part under this Limited Warranty shall not extend the duration of the warranty with respect to such repaired or replaced part beyond the stated warranty period.

THIS LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EITHER EXPRESS OR IMPLIED, AND ALL SUCH OTHER WARRANTIES, INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE HEREBY DISCLAIMED AND EXCLUDED FROM THIS LIMITED WARRANTY. IN NO EVENT SHALL THE MANUFACTURER BE LIABLE IN ANY WAY FOR ANY CONSEQUENTIAL, SPECIAL, OR INCIDENTAL DAMAGES OF ANY NATURE WHATSOEVER, OR FOR ANY AMOUNTS IN EXCESS OF THE SELLING PRICE OF THE PRODUCT OR ANY PARTS THEREOF FOUND TO BE DEFECTIVE. THIS LIMITED WARRANTY GIVES THE ORIGINAL OWNER OF THE PRODUCT SPECIFIC LEGAL RIGHTS. YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY BY EACH JURISDICTION.

– 27 –

Page 28

IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX (413) 564-5815

IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 (905) 670-5888 / FAX (905) 670-5782