KRACK SM Series Specification sheet

SM/SV-Space Master Unit Coolers (E316008_B)
S
SM M/ /S SV V S Se er ri ie es s
S
Sp pa ac ce e M Ma as st te er r U Un ni it t
C
Co oo ol le er rs s
O Op pe er ra at ti in ng g
a an nd d
I In ns st ta al ll la at ti io on n
M Ma an nu ua al l

SM/SV-Space Master Unit Coolers (E316008_B)
1
TABLE OF CONTENTS
FIGURES___________________________________________________________________________ 2
1RECEIPT OF EQUIPMENT _______________________________________________________ 3
1.1 INSPECTION ________________________________________________________________ 3
1.2 LOSS OF GAS HOLDING CHARGE______________________________________________ 3
2ASSEMBLY OF COMPONENTS___________________________________________________ 3
2.1 SHIPPED LOOSE PARTS- LONG THROW ADAPTERS _____________________________ 3
3RIGGING INSTRUCTIONS _______________________________________________________ 3
3.1 RIGGING INSTRUCTIONS_____________________________________________________ 3
4UNIT INFORMATION AND DIMENSIONS _________________________________________ 3
4.1 MODELS COVERED__________________________________________________________ 3
4.2 UNIT DIMENSIONS __________________________________________________________ 4
5UNIT LOCATION AND MOUNTING_______________________________________________ 5
5.1 UNIT LOCATION ____________________________________________________________ 5
5.2 MOUNTING _________________________________________________________________ 5
6PIPING INSTALLATION _________________________________________________________ 5
6.1 DRAIN LINE_________________________________________________________________ 5
6.2 REFRIGERATION PIPING _____________________________________________________ 6
6.3 EVACUATION AND LEAK TEST _______________________________________________ 6
6.4 SM GAS DEFROST PIPING ____________________________________________________ 6
7ELECTRICAL__________________________________________________________________ 10
7.1 FIELD WIRING _____________________________________________________________ 10
7.2 ELECTRICAL DATA_________________________________________________________ 10
7.3 AIR DEFROST SEQUENCE OF OPERATION_____________________________________ 12
7.4 ELECTRIC DEFROST SEQUENCE OF OPERATION_______________________________ 13
7.5 HOT GAS DEFROST SEQUENCE OF OPERATION________________________________ 15
8START UP _____________________________________________________________________ 18
8.1 PRE-STARTUP______________________________________________________________ 18
8.2 OPERATION CHECKOUT ____________________________________________________ 19
9PREVENTATIVE MAINTENANCE _______________________________________________ 19
9.1 DRAIN PAN ________________________________________________________________ 19
9.2 COIL AND CABINET ________________________________________________________ 20
9.3 FAN GUARD OR LONG THROW ADAPTER REPLACEMENT ______________________ 20
9.4 FAN REPLACEMENT ________________________________________________________ 20
9.5 UNIT MOTOR REPLACEMENT________________________________________________ 20
9.6 ELECTRIC DEFROST HEATERS_______________________________________________ 20
10 TROUBLESHOOTING CHART_________________________________________________ 21
11 REPLACEMENT PARTS LIST _________________________________________________ 21

SM/SV-Space Master Unit Coolers (E316008_B)
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TABLE OF CONTENTS
CHARTS
Table 1 UNIT DIMENSIONS ____________________________________________________________ 4
Table 2 CHECK VALVES KITS___________________________________________________________ 8
Table 3 DISTRIBUTOR NOZZLE CAPACITIES –TONS OF REFRIGERANT ______________________ 9
Table 4 SM MOTOR ELECTRICAL DATA (AMPS) __________________________________________ 10
Table 5 SV MOTOR ELECTRICAL DATA (AMPS) __________________________________________ 10
Table 6 SM (D) ED & (E) EDL HEATERS ELECTRICAL DATA________________________________ 11
Table 7 SM (P) KGE & (H) HGE HEATERS ELECTRICAL DATA ______________________________ 12
Table 8 REPLACEMENT PARTS LIST____________________________________________________ 19
FIGURES
Table 1 UNIT DIMENSIONS ____________________________________________________________ 4
Table 2 CHECK VALVES KITS___________________________________________________________ 8
Table 3 DISTRIBUTOR NOZZLE CAPACITIES –TONS OF REFRIGERANT ______________________ 9
Table 4 SM MOTOR ELECTRICAL DATA (AMPS) __________________________________________ 10
Table 5 SV MOTOR ELECTRICAL DATA (AMPS) __________________________________________ 10
Table 6 SM (D) ED & (E) EDL HEATERS ELECTRICAL DATA________________________________ 11
Table 7 SM (P) KGE & (H) HGE HEATERS ELECTRICAL DATA ______________________________ 12
Table 8 REPLACEMENT PARTS LIST____________________________________________________ 19

SM/SV-Space Master Unit Coolers (E316008_B)
3
1RECEIPT OF EQUIPMENT
1.1 INSPECTION
All equipment should be carefully checked for damage or shortages as soon as it is received. Each shipment
should be carefully checked against the bill of lading. If any damage or shortage is evident, a notation must be
made on the delivery receipt before it is signed and a claim should then be filed against the freight carrier.
1.2 LOSS OF GAS HOLDING CHARGE
Each unit cooler is leak tested, evacuated to remove moisture and then shipped with a gas holding charge.
Absence of this charge may indicate a leak has developed in transit. The system should not be charged with
refrigerant until it is verified that there is no leak or the source of the leak is located.
2ASSEMBLY OF COMPONENTS
2.1 SHIPPED LOOSE PARTS- LONG THROW ADAPTERS
Long Throw Adapters shipped loose. They should be mounted on the unit before the unit is installed. The
evaporator fan cabinet contains through-bolts with the threaded end pointing out away from the fan cabinet. The
bolts have two ½” nuts, flat washers, and a lock washer on them. Remove the outer most nuts, lock washer, and
one flat washer. Place Long Throw Adapter on the bolts braced against the remaining flat washer. While
holding the adapter with one hand place the flat washers, then the lock washers, and then thread the nuts on the
top two bolts to hold the guard and adapter in place. Then place the remaining washers and thread the remaining
two nuts on the bottom two bolts. Secure with a wrench.
3RIGGING INSTRUCTIONS
3.1 RIGGING INSTRUCTIONS
SM/SV unit tends to be a long and heavy object with about 2/3 of the weight contained in the coil element at the
rear of the unit. Jobsite requirements will affect the method of moving and lifting the unit into place. Carefully
consider the support that is required to lift and move the unit. Under no circumstances should the shipping skid
be used for lifting the unit. To ensure that the unit is not bowed or damaged when being lifted into place from
above, all leg or hanger points should be used. If the unit is being lifted into place from underneath, a level
support directly under all of the shipping legs is required to adequately steady the unit as it is lifted to the hanger
rods.
4UNIT INFORMATION AND DIMENSIONS
4.1 MODELS COVERED
SM Series medium profile unit coolers.
SV Series medium profile unit coolers - low temperature.
The SM and SV series are designed for walk-in coolers with ceiling heights of 12 to 25 feet that require high
airflow. SM/SV unit coolers draw air through the coil and discharge it into the room via the unit fans.
The SM/SV series handles medium to low temperature requirements and has three defrost options –air, electric
and hot gas. The SV series is designed for low temperatures allowing extra high air discharge velocities. The SV
unit coolers are only available with electric defrost.

SM/SV-Space Master Unit Coolers (E316008_B)
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Figure 1 Model Key
4.2 UNIT DIMENSIONS
Figure 2 Unit Dimensions
Table 1 UNIT DIMENSIONS
Fan Q-ty
A
B
C
D
E
1
77.00
60.00
60.00
40.50
34.00
2
134.25
117.00
58.50
40.50
34.00
3
134.25
117.00
39.00
52.50
46.00
4
173.00
156.00
39.00
52.50
46.00
SM/SV Model Key
SM 2 5 E - 842 - C K K
Unit Type Heater Voltage
SM: Space Master K - 208-230/3/60
SV: High Velocity M - 460/3/60
Number of Fans P - 575/3/60
U - 380/3/50
Fin Spacing
4, 5, 6, 7 FPI Motor Voltage
K - 208-230/3/60
Type of Defrost M - 460/3/60
A - Air P - 575/3/60
B - Brine U - 380/3/50
D - Electric w/ no pan heat Motor Type
E - Electric w/ electric pan C - 3 Phase motors
G - 3 pipe hot gas w/ hot gas drain pan
H - 3 pipe hot gas w/ electric drain pan BTU/h in hundreds (00)
K - 2 pipe cool gas w/ cool gas drain pan
P - 2 pipe cool gas w/ electric drain pan
R - Heat reclaim

SM/SV-Space Master Unit Coolers (E316008_B)
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5UNIT LOCATION AND MOUNTING
5.1 UNIT LOCATION
Unit coolers must be located to provide good air circulation to all areas of the cooler. The unit cooler should be
positioned to blow away from the wall and directed down an aisle rather than into and through shelves. For best
performance it is desirable to arrange the air discharge toward the door of the cooler to minimize the entrance of
warm moist air when the door is open. Light fixtures, shelving and product boxes must be located so that they
do not block the air intake or air discharge from the unit cooler.
IMPORTANT:
The coil face must be located a minimum of 34” for 1, 2 fans and 46” for 3, 4 fans from back side to the
wall to assure unrestricted air intake.
5.2 MOUNTING
Install the expansion valve and equalizer connection before hanging the unit cooler.
The unit cooler should be suspended with 1/2” or 5/8” diameter hanger rods. Rods should have double nuts on
the top and bottom. Adequate support must be provided to hold the weight of the unit.
The unit must be mounted so that the drain pan end is approximately 1” lower then the bottom of the electrical
end of the unit. If mounted to a level ceiling the hanging brackets are providing the slope. Mount to ceiling with
u-channels provided. Suspended units must have sufficient clearance above for cleaning the top. Remove
shipping legs after installation.
6PIPING INSTALLATION
6.1 DRAIN LINE
The drain line should be as short and as steeply pitched as possible with a minimum of ¼” drop per running foot.
A drain line trap should be installed to prevent warm moist air from migrating through the drain line. If the
temperature surrounding the drain line and trap is below freezing (32 ) it must be wrapped with a drain line
heater and insulation. Be sure to also wrap the drain pan coupling. The drain line heater must be energized
continuously. Be sure to follow the manufacturer’s recommendation when installing the drain line heat tape.
Figure 3 Drain Line
EVAPORATOR
DRAIN PAN
4" to 6"
DRAIN TRAP
CONDENSATE
DRAIN LINE
UNION
DRAIN LINE WRAPPED
WITH INSULATING MATERIAL
THERMOSTATICALLY CONTROLLED
HEATING CABLE
INSULATED
WALL
HEATING CABLE
POWER LINE
VAPOR SEAL THE
PIPE PENETRATION
AND AWAY FROM EVAPORATOR
SLOPE DRAIN PIPE DOWN
WITH ACCESS
( 1/4 INCH PER FOOT OF PIPE )

SM/SV-Space Master Unit Coolers (E316008_B)
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A union at the drain connection in the drain pan is recommended for ease of installation and future servicing.
The union should be located as close to the drain pan as possible. Use two wrenches when tightening to prevent
the drain fitting from twisting and damaging the unit.
Hangers to avoid damage to the drain pan should support long runs of drain line, i.e. more than a few feet.
Figure 4 Pipe Joining
6.2 REFRIGERATION PIPING
System design must conform to all local and national codes, laws and regulations applying to the site of
installation. In addition the safety code for mechanical refrigeration, ASME B31.5, should be followed as a
guide to safe installation and operation practice.
Refrigerant line sizes and piping techniques should be obtained from the ASHRAE guide or equivalent
reference. Under no circumstances should the refrigerant connection size of the unit be used as the basis for
sizing the lines.
The horizontal suction line should slope away from the unit cooler toward the compressor. Vertical suction
risers may require a trap at the bottom of the riser for proper oil return.
When connecting multiple unit coolers in series using a common suction line, the branch suction lines must enter
the top of the common suction line. The branch lines must be sized for the evaporator capacity and the common
suction line to be sized for the total system capacity.
6.3 EVACUATION AND LEAK TEST
When all refrigeration connections have been completed, the entire system must be tested for leaks and then
evacuated. Refer to the instructions provided with your systems condensing unit for information on performing
the leak test and evacuation.
6.4 SM GAS DEFROST PIPING
Figure 5 Gas Defrost Piping Diagrams
See legend on page 7.

SM/SV-Space Master Unit Coolers (E316008_B)
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Legend
Piping by Manufacturer - - - - Piping by Others
CV1 Suction Check Valve CV2 Gas Inlet Check Valve
CV3 Relief Check Valve TEV Expansion Valve
ASC Aux. Side Connector LSV Liquid Solenoid Valve
See Table 2 for Check Valves Kits.

SM/SV-Space Master Unit Coolers (E316008_B)
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Table 2 CHECK VALVES KITS
Model
(K) KGG, (P) KGE
Suct line
Gas inlet
Gas relief
(G) HGG, (H) HGE
Gas inlet
SM
Check Valves Kit
CV diam
CV diam
CV diam
Check Valves Kit
CV diam
384
CE269377
1.625
0.500
0.500
CE269381
0.500
426
1.625
0.500
0.500
0.500
440
1.625
0.500
0.500
0.500
501
CE269378
2.125
0.875
0.875
CE269382
0.875
556
2.125
0.875
0.875
0.875
574
2.125
0.875
0.875
0.875
759
2.125
0.875
0.875
0.875
842
2.125
0.875
0.875
0.875
869
2.125
0.875
0.875
0.875
989
CE269379
2.625
0.875
0.875
CE269382
0.875
1070
2.625
0.875
0.875
0.875
1097
2.625
0.875
0.875
0.875
1132
2.625
0.875
0.875
0.875
1186
2.625
0.875
0.875
0.875
1225
CE269380
2.625
1.125
1.125
CE269383
1.125
1393
2.625
1.125
1.125
1.125
1544
2.625
1.125
1.125
1.125
1594
2.625
1.125
1.125
1.125
1465
2 CE269378
2.125
0.875
0.875
2 CE269382
0.875
1523
2.125
0.875
0.875
0.875
1754
2.125
0.875
0.875
0.875
1769
2.125
0.875
0.875
0.875
1985
2 CE269379
2.625
0.875
0.875
0.875
2307
2.625
0.875
0.875
0.875
6.5 REFRIGERANT DISTRIBUTOR NOZZLES
Direct expansion unit coolers are piped using a refrigerant distributor with a changeable nozzle design to
equally distribute refrigerant to each circuit of the evaporator coil. Distributor nozzles are installed at the
factory.
The nozzles provided with the unit have been selected for design conditions of 9 F to 11 F T.D. and 90 F (85 F
electric and hot gas defrost) liquid refrigerant at the expansion valve inlet. If the unit will be operated at
conditions that are substantially different from these conditions it may be necessary to select a different size
nozzle. Contact the factory for advice.
The nozzle must be installed in the distributor or the auxiliary side connector before installing the expansion
valve. There are nozzle identification numbers stamped on one side of the nozzle. Be sure to insert the nozzle
into the distributor with these numbers visible in case identification is required later. The nozzle is held in place
by a retainer ring that is easily inserted or removed with a pair of needle nose pliers.

SM/SV-Space Master Unit Coolers (E316008_B)
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Table 3 DISTRIBUTOR NOZZLE CAPACITIES –TONS OF REFRIGERANT
Distributor
nozzle number
R-134A
R-22
Evaporator Temperature (F)
40
20
0
-20
40
20
0
-20
-40
1/9
0.08
0.06
0.05
0.04
0.14
0.11
0.09
0.07
0.06
1/6
0.12
0.09
0.07
0.06
0.21
0.16
0.13
0.11
0.09
1/4
0.2
0.15
0.12
0.1
0.34
0.26
0.21
0.18
0.15
1/3
0.26
0.2
0.15
0.13
0.44
0.34
0.28
0.23
0.2
1/2
0.36
0.27
0.21
0.17
0.61
0.48
0.38
0.32
0.27
3/4
0.54
0.41
0.32
0.26
0.92
0.72
0.58
0.48
0.41
1
0.72
0.54
0.43
0.35
1.23
0.96
0.78
0.64
0.55
1-1/2
1.05
0.79
0.63
0.51
1.79
1.4
1.13
0.94
0.8
2
1.44
1.09
0.86
0.7
2.46
1.92
1.55
1.29
1.1
2-1/2
1.79
1.35
1.07
0.88
3.07
2.39
1.93
1.6
1.37
3
2.15
1.63
1.28
1.05
3.68
2.87
2.32
1.93
1.65
4
288
2.18
1.72
1.41
4.92
3.84
3.1
2.58
2.2
5
3.55
2.68
2.12
1.74
6.07
4.74
3.83
3.18
2.72
6
4.26
3.22
2.54
2.08
7.28
5.68
4.59
3.81
3.26
8
5.13
3.88
3.06
2.51
8.77
6.84
5.52
4.59
3.93
10
5.75
4.35
3.43
2.81
9.83
7.67
6.19
5.15
4.4
12
7
5.37
4.24
3.47
12.1
9.47
7.65
6.36
5.43
15
8.81
6.65
5.25
4.3
15.1
11.7
9.48
7.88
6.74
17
9.85
7.44
5.87
4.81
16.8
13.1
10.8
8.81
7.54
20
11.9
8.97
7.08
5.8
20.3
15.8
12.8
10.6
9.08
25
14.9
11.3
8.91
7.3
25.5
19.9
16.1
13.4
11.4
Distributor
nozzle number
R-404A
R-507
Evaporator Temperature (F)
40
20
0
-20
-40
40
20
0
-20
-40
1/9
0.09
0.07
0.05
0.04
0.04
0.09
0.07
0.05
0.04
0.03
1/6
0.14
0.11
0.08
0.07
0.05
0.14
0.11
0.08
0.07
0.05
1/4
0.23
0.17
0.13
0.11
0.09
0.23
0.17
0.13
0.11
0.09
1/3
0.3
0.23
0.18
0.14
0.11
0.29
0.22
0.17
0.14
0.11
1/2
0.41
0.31
0.24
0.19
0.16
0.41
0.31
0.24
0.19
0.16
3/4
0.62
0.47
0.37
0.29
0.24
0.61
0.47
0.36
0.29
0.23
1
0.83
0.63
0.49
0.39
0.32
0.82
0.62
0.49
0.39
0.31
1-1/2
1.2
0.92
0.71
0.57
0.46
1.2
0.91
0.71
0.56
0.46
2
1.65
1.26
0.98
0.78
0.64
1.64
1.25
0.97
0.77
0.62
2-1/2
2.06
1.57
1.22
0.97
0.79
2.05
1.56
1.21
0.96
0.78
3
2.47
1.88
1.47
1.17
0.95
2.46
1.87
1.45
1.15
0.93
4
3.31
2.52
1.96
1.56
1.27
3.29
2.5
1.94
1.54
1.25
5
4.08
3.11
2.42
1.93
1.57
4.06
3.08
2.4
1.9
1.54
6
4.89
3.72
2.91
2.31
1.88
4.86
3.69
2.87
2.28
1.85
8
5.89
4.49
3.5
2.79
2.27
5.86
4.45
3.46
2.75
2.23
10
6.6
5.03
3.92
3.12
2.54
6.57
4.99
3.88
3.08
2.5
12
8.16
6.21
4.84
3.86
3.14
8.11
6.16
4.79
3.8
3.08
15
10.1
7.7
6.01
4.78
3.89
10.1
7.64
5.94
4.72
3.83
17
11.3
8.61
6.72
5.35
4.35
11.2
8.54
6.64
5.27
4.28
20
13.6
10.4
8.1
6.45
5.24
13.6
10.3
8.01
6.38
5.16
25
17.1
13.1
10.2
8.11
6.6
17.1
12.9
10.1
8
6.48