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)
2
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)
4
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)
5
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)
6
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)
9
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

SM/SV-Space Master Unit Coolers (E316008_B)
10
6.5 EXPANSION VALVE
Before mounting the unit, install the expansion valve and connect the equalizer tube. The expansion valve
should be installed directly to the distributor body or as close as possible with no elbows or bends. Locate the
expansion valve bulb on a horizontal length of suction line as close to the suction header as possible. Position
the bulb in a 3, 4 or 8, 9 o’clock position (do not position on the bottom side of the pipe). Clamp the bulb down
flush and tight against the pipe and insulate. Never locate the bulb in a trap or downstream from a trap.
Expansion valves are adjusted at the factory prior to shipment. The setting will be correct for many applications,
but in other applications adjustments may be needed. It is important that the operation of the expansion valve be
checked after the system has balanced out at the desired room temperature. If the coil is being starved it is
necessary to reduce the superheat setting of the valve by turning the adjusting stem counter-clockwise. If the
superheat is too low it is necessary to increase the superheat setting of the valve by turning the adjusting stem
clockwise. It is recommended that for a 10 F to 12 F T.D. system, the valve should be adjusted to maintain 5 F
to 6 F superheat.
7ELECTRICAL
7.1 FIELD WIRING
Field wiring should comply with NEC and local codes. The power supply voltage, phase and frequency must
match what is shown on the unit cooler data plate.
The field-wiring compartment is constructed as part of the unit cooler enclosure. The wiring diagram for each
unit is located on the inside of the electrical panel door. Wiring connections are made at the terminal block(s)
provided inside the unit on the end opposite the refrigerant connections. The unit must be grounded. Refer to
tables 3, 4, and 5 for motor and heater electrical information.
7.2 ELECTRICAL DATA
Table 4 SM MOTOR ELECTRICAL DATA (AMPS)
FAN Q-ty
230/60/3
460/60/3
575/60/3
1
4.00
2.00
1.45
2
8.00
4.00
2.90
3
12.00
6.00
4.35
4
16.00
8.00
5.80
Table 5 SV MOTOR ELECTRICAL DATA (AMPS)
FAN Q-ty
230/60/3
460/60/3
575/60/3
1
7.00
3.50
2.60
2
14.00
7.00
5.20
3
21.00
10.50
7.80
4
28.00*
14.00
10.40
*Total 24 amps wired in two circuits.

SM/SV-Space Master Unit Coolers (E316008_B)
11
Table 6 SM (D) ED & (E) EDL HEATERS ELECTRICAL DATA
Fan
Q-ty
Coil
Heaters
Pan
Heaters
Total
Watts
Total
Amps
Model
V
Hz
Ph
V
Watts
ea
Q-ty
V
Watts
ea
Q-
ty
Circ
#1
Circ
#2
Circ
#3
Circ
#1
Circ
#2
Circ
#3
(E) EDL (SM & SV) –Coil and Drain Electrical Defrost
230
60
3
130
750
15
130
850
3
13800
-
-
34.70
-
-
1
384,426,440,501,556,574
460
60
3
265
750
15
265
850
3
13800
-
-
17.30
-
-
575
60
3
330
750
15
330
850
3
13800
-
-
13.87
230
60
3
130
750
15
130
850
3
13800
-
-
34.70
-
-
1
422,468,664,550,611,684
460
60
3
265
750
15
265
850
3
13800
-
-
17.30
-
-
575
60
3
330
750
15
330
850
3
13800
-
-
13.87
230
60
3
130
1400
15
130
1500
3
16800
8700
-
42.20
21.9
-
2
759,842,869,989,1097,1132
460
60
3
265
1400
15
265
1500
3
25500
-
-
32.00
-
-
575
60
3
330
1400
15
330
1500
3
25500
-
-
25.63
230
60
3
130
1400
15
130
1500
3
16800
8700
-
42.20
21.9
-
2
834,926,1005,1088,1206,1311
460
60
3
265
1400
15
265
1500
3
25500
-
-
32.00
-
-
575
60
3
330
1400
15
330
1500
3
25500
-
-
25.63
230
60
3
130
1400
18
130
1500
3
16800
12900
-
42.20
32.5
-
3
1070,1186,1225,1393,1544,1594
460
60
3
265
1400
18
265
1500
3
29700
-
-
37.40
-
-
575
60
3
330
1400
18
330
1500
3
29700
-
-
29.86
230
60
3
130
1400
18
130
1500
3
16800
12900
-
42.20
32.5
-
3
1177,1304,1418,1530,1698,1843
460
60
3
265
1400
18
265
1500
3
29700
-
-
37.40
-
-
575
60
3
330
1400
18
330
1500
3
29700
-
-
29.86
230
60
3
130
1800
18
130
950
6
16200
16200
5700
40.71
40.7
14.3
4
1465,1523,1754,1769,1985,2307
460
60
3
265
1800
18
265
950
6
38100
-
-
47.80
-
-
575
60
3
330
1800
18
330
950
6
38100
-
-
38.30
230
60
3
130
1800
18
130
950
6
16200
16200
5700
40.71
40.7
14.3
4
1699,1883,2047,2052,2274,2472
460
60
3
265
1800
18
265
950
6
38100
-
-
47.80
-
-
575
60
3
330
1800
18
330
950
6
38100
-
-
38.30
(D) ED (SM ONLY) –Coil Electrical Defrost
230
60
3
130
750
9
-
-
-
6750
-
-
17.00
-
-
1
384,426,440
460
60
3
265
750
9
-
-
-
6750
-
-
8.50
-
-
575
60
3
330
750
9
-
-
-
6750
-
-
6.79
-
-
230
60
3
130
750
12
-
-
-
9000
-
-
22.60
-
-
1
501,556,574
460
60
3
265
750
12
-
-
-
9000
-
-
11.30
-
-
575
60
3
330
750
12
-
-
-
9000
-
-
9.05
-
-
230
60
3
130
1400
12
-
-
-
16800
-
-
42.20
-
-
2
759,842,869,989,1097,1132
460
60
3
265
1400
12
-
-
-
16800
-
-
21.10
-
-
575
60
3
330
1400
12
-
-
-
16800
-
-
16.89
-
-
230
60
3
130
1400
12
-
-
-
16800
-
-
42.20
-
-
3
1070,1186,1225
460
60
3
265
1400
12
-
-
-
16800
-
-
21.10
-
-
575
60
3
330
1400
12
-
-
-
16800
-
-
16.89
-
-
230
60
3
130
1400
15
-
-
-
16800
4200
-
42.20
10.6
-
3
1393,1544,1594
460
60
3
265
1400
15
-
-
-
21000
-
-
26.40
-
-
575
60
3
330
1400
15
-
-
-
21000
-
-
21.11
-
-
230
60
3
130
1800
12
-
-
-
16200
5400
-
40.70
13.5
-
4
1465,1523,1754
460
60
3
265
1800
12
-
-
-
21600
-
-
27.10
-
-
575
60
3
330
1800
12
-
-
-
21600
-
-
21.71
-
-
230
60
3
130
1800
15
-
-
-
16200
10800
-
40.70
27.1
-
4
1769,1985,2307
460
60
3
265
1800
15
-
-
-
27000
-
-
33.90
-
-
575
60
3
330
1800
15
-
-
-
27000
-
-
27.14
-
-

SM/SV-Space Master Unit Coolers (E316008_B)
12
Table 7 SM (P) KGE & (H) HGE HEATERS ELECTRICAL DATA
Fan Q-ty
Pan Heaters
Total
Watts
Total
Amps
V
Hz
Ph
V
Watts ea
Amount
230
60
3
130
850
3
2550
6.41
1
460
60
3
265
850
3
2550
3.20
575
60
3
330
850
3
2550
2.56
230
60
3
130
1500
3
4500
11.31
2,3
460
60
3
265
1500
3
4500
5.65
575
60
3
330
1500
3
4500
4.52
230
60
3
130
950
6
5700
14.95
4
460
60
3
265
950
6
5700
7.16
575
60
3
330
950
6
5700
5.73
7.3 AIR DEFROST SEQUENCE OF OPERATION
SEQUENCE OF OPERATION
1. The unit cooler fan motors are energized and the fans operate continually.
2. The room thermostat calls for cooling. The liquid solenoid valve opens allowing liquid to flow to the unit
cooler. The suction pressures rises and starts the compressor.
3. When the room temperature is satisfied the thermostat opens and closes the liquid solenoid. The compressor
continues to run until the suction pressure reaches the low-pressure cutout setting and shuts off the
compressor.
4. The fan circulates air over the coil and frost melts.
For air defrost to work properly the compressor run time should not exceed 40 minutes per hour.
Figure 6 (A) Air Defrost Wiring Diagram

SM/SV-Space Master Unit Coolers (E316008_B)
13
7.4 ELECTRIC DEFROST SEQUENCE OF OPERATION
The electric defrost cycle is time clock initiated and temperature terminated with a timer and or high temperature
over-ride. For systems with multiple unit coolers and a single defrost time clock the defrost termination
thermostat must be wired in series. Reference figures 4 and 5 for electric defrost wiring diagrams.
SEQUENCE OF OPERATION
STEP A: Normal Refrigeration Cycle
1. Power is supplied to terminals “N’ and “4” on the defrost timer.
2. The heater safety and fan delay thermostat are closed, the defrost termination thermostat is off and the
defrost heaters are off.
3. The unit cooler fan motors are energized and the fans operate continually.
4. The systems compressor operates in accordance with the demand of the room thermostat.
5. Frost slowly builds up on the evaporator fins.
STEP B: Defrost Cycle
The timer starts defrosting of the evaporator coil at a predetermined interval. A typical setting would be two
defrost periods per 24-hour day.
1. Upon initiation of the defrost cycle, the timer mechanically disconnects power to terminal “4” thus closing
the liquid line solenoid valve and shutting off the fan motors. Simultaneously power is connected to terminal
“3” which allows current to flow to the defrost heaters.
2. The heaters, embedded in slots in the coil face, give up heat directly to the evaporator fins. This heat raises
the coil temperature to 32 F causing the frost to melt.
3. As the frost melts it drops into the drain pan and flows down the drain.
4. When the frost has completely melted from the coil the temperature of the coil will start to rise above 32 F.
5. When the coil reaches the temperature setting of the defrost termination thermostat (75 F for fixed Klixon),
the thermostat closes which allows current to flow to terminal “X” on the timer which energizes the
switching solenoid in the timer. The timer disconnects power to terminal “3” thus turning off the defrost
heaters. At the same, instant power is connected to terminal “4” of the timer.
6. Because there is power at terminal “4” the liquid line solenoid opens and the compressor restarts.
7. The evaporator fan motor(s) remain off because the fan delay thermostat is still open. This prevents warm
air from being blown into the refrigerated area.
8. The evaporator coil cools down approaching operating temperature.
9. When the coil temperature reaches 25 F (approximately 2 to 3 minutes after defrost termination) the fan
delay thermostat closes, thus allowing the fan motors to restart. The unit is now back in operation.
10. The heater safety thermostat will only open if the defrost termination thermostat fails to close at it’s set
temperature. The heater safety thermostat is set to open at 80 F. The timer also has a fail-safe (inner dial)
timeout; the recommended setting is for 30 minutes.
NOTE: On systems where the room temperature is above +25 F the fan delay thermostat may not close for an
extended period of time. If the fan delay time is too long, it is permissible to install a jumper wire between
terminals “F” and “B” at the unit cooler. This allows the fans to turn on immediately after the defrost period.

SM/SV-Space Master Unit Coolers (E316008_B)
14
Figure 7 ELECTRIC DEFROST WIRING WITH DEFROST TIMER
Figure 8 (E) EDL Electrical Defrost Wiring 208-230/3/60

SM/SV-Space Master Unit Coolers (E316008_B)
15
Figure 9 (E) EDL Electrical Defrost Wiring 380/460/575/3/60
7.5 HOT GAS DEFROST SEQUENCE OF OPERATION
The hot gas defrost cycle is time clock initiated and terminated.
(H) HGE/(G) HGG THREE PIPE HOT GAS DEFROST
Three pipes hot gas defrost systems distribute compressor discharge gas through a separate hot gas line,
controlled by a solenoid valve, through a check valve to the refrigerant distributor auxiliary side connection.
Defrost condensate and gas vapor is evaporated in a re-evaporator outside the SM/SV unit prior to returning to
the compressor through the suction line.
SEQUENCE OF OPERATION
1. Upon initiation of the cycle, the timer contacts “1” and “4” opens thus de-energizing the liquid solenoid
valve and the fan motors. If the unit has electric drain pan heater, contacts “4” and “5” close, thus energizing
the drain pan heater. The compressor pumps the refrigerant out of the coil.
2. The timer contacts “4” and “2” closes, thus energizing the hot gas solenoid valve and allows hot gas to flow
into the coil through a check valve and the refrigerant distributor auxiliary side connection.
3. After the timer timeouts contacts “4” and “2” open, thus de-energizing the hot gas solenoid valve. During
this period the coil pressure will vent down to the compressor suction pressure.
4. Upon termination of the vent down cycle the contacts between “4” and “
1” close, thus de-energizing the drain pan heater if the unit is equipped with one. The contacts between “4”
and “1” close, thus opening the liquid line solenoid valve and starts the fan motors.

SM/SV-Space Master Unit Coolers (E316008_B)
16
Figure 10 (H) HGE (3 Pipe) Hot Gas and Electrical Drain Pan Wiring
Figure 11 (G) HGG (3 Pipe) Hot Gas Coil and Hot Gas Drain Pan Wiring
(P) KGE/(H) KGG REVERSE CYCLE (2 PIPE) HOT GAS DEFROST
SEQUENCE OF OPERATION
Reverse cycle (2 pipe) defrost systems distribute compressor discharge gas through the suction line during
defrost. Defrost condensate flows through the refrigerant distributor auxiliary side connection and a check valve,
bypassing the expansion valve and the liquid line solenoid valve into the liquid line, which is reduced in
pressure.

SM/SV-Space Master Unit Coolers (E316008_B)
17
1. Power is supplied to the unit cooler continuously.
2. Hot gas is supplied to the unit via the suction line. A factory-mounted thermostat senses a rise in coil
temperature. The SPDT control turns off the fan motors. If the unit has a drain pan heater, the other portion
of the SPDT control is now closed and the drain pan heater is energized.
3. When the defrost is complete the hot gas supply is stopped. The liquid line solenoid is energized and the coil
temperature begins to fall.
4. The factory-mounted thermostat senses the drop in coil temperature. The SPDT thermostat opens the circuit
to the drain pan heater (when supplied) and closed the circuit to the fan motors.
Figure 12 (P) KGE (2 Pipe) Kool Gas Coil and Electrical Drain Pan Wiring

SM/SV-Space Master Unit Coolers (E316008_B)
18
Figure 13 (K) KGG (2 Pipe) Cool Gas Coil and Drain Pan Wiring
Single Pole Single Throw (SPST) contacts Fan Delay Thermostat mounted on the unit.
RECOMMENTED (SPST) FAN DELAY THERMOSTAT SETTINGS FOR KGE/HGG
ROOM TEMPERATURE
RANGE
DIFFERENTIAL
0 F TO +35 F
45 F
15 F
BELOW 0 F
20 F
10 F
8START UP
8.1 PRE-STARTUP
After the installation is completed, a review of the following items should be preformed before the system is
placed into operation:
Check electrical connections, fan blade set screws, fan motors, guards and all other fasteners for tightness. Be
sure the thermostatic expansion valve bulb is properly located, strapped and insulated.
With the system operating, check the supply voltage. It must be within +/- 10% of the voltage marked on the
unit nameplate.
For electric defrost systems check the defrost timer to see that it is set for the correct time of day and the starting
pins have been installed (normally two per day). The defrost should be scheduled for times when the freezer
doors are not likely to be open.
When the system is first started up, the box temperature is typically above the opening temperature of the fan
delay thermostat. The fans may remain off for a lengthy period of time. To prevent this it is permissible to install
a temporary jumper wire between terminals “F” and “B” or “N” and “B” depending on the unit wiring
arrangement. Once the box temperature is below +25 F the jumper wire should be removed. See Figure 7, 8, 9

SM/SV-Space Master Unit Coolers (E316008_B)
19
8.2 OPERATION CHECKOUT
With the system operating, check the supply voltage. The voltage must be within +/- 10% of the voltage marked
on the unit nameplate and the phase to phase unbalance should be 2% or less.
LISTEN CAREFULLY to the unit to make sure there are no unusual sounds. Sounds such as a noisy motor, the
fan(s) scraping on the housing, or loose fasteners allowing parts to rattle need to be addressed immediately
before continued unit operation.
Check the room THERMOSTAT setting. Be sure it functions properly.
For DIRECT EXPANSION systems let the system balance out at the desired room temperature and check the
operation of the expansion valve by properly measuring the superheat at the sensing bulb. As much as thirty
minutes may be required for the new balance to take place after an adjustment is made.
For BRINE or GLYCOL COOLING systems keep the closest vent to the coil open while the fluid fills the coil to
allow trapped air to escape. Close the vent valve once fluid flows out of the valve and check for water hammer
in the coil.
With HOT GAS DEFROST systems allow the coil to frost, then manually advance the defrost timer to initiate a
defrost cycle. Observe the defrost cycle to see if all controls are functioning properly and that the coil is clear of
all frost before the system returns to refrigeration. Adjust the time clock pins if necessary. Reset the defrost
timer to the correct time of day. A defrost cycle is only needed when the frost build up is such that it impedes
the airflow through the coil. The defrost requirements will vary on each installation and may change depending
on the time of the year and other conditions.
With ELECTRIC DEFROST systems allow the coil to frost then manually advance the defrost timer to initiate a
defrost cycle. Observe the defrost cycle to see if all controls are functioning properly and that the coil is clear of
all frost before the system returns to refrigeration. Adjust the time clock pins if necessary. Reset the defrost
timer to the correct time of day. A defrost cycle is only needed when the frost build up is such that it impedes
the airflow through the coil. The defrost requirements will vary on each installation and may change depending
on the time of the year and other conditions.
9PREVENTATIVE MAINTENANCE
A preventive maintenance schedule should be established as soon as the SM/SV Series unit is installed. The unit
should be inspected periodically for proper operation and build up of frost and debris.
WARNING: All power to the evaporator must be off before cleaning or performing maintenance.
9.1 DRAIN PAN
Inspect and clean the drain pan to insure free drainage of condensate. The drain pan should be cleaned regularly
with warm water and soap.
If the drain pan needs to be removed, support the long dimension of the pan from underneath with a minimum of
two 4x4s for one and two fan units, or two 6x6s for three and four fan units, so the outer sheet metal skin does
not buckle and become damaged. Do not point load the center of the support beam. For longer pans more
than one lifting device may be needed to keep the pan balanced when lifting. If the drain pan uses hot gas
defrost make sure the coil is completely pumped out and isolated with hand valves to prevent refrigerant from
escaping to the atmosphere. Remove electric wires if the unit has an electric defrost drain pan. Remove the drain
line so that it is out of the way of the pan when it is being lowered. Remove the drain pan attachment bolts from
the bottom of the evaporator unit and slowly lower the pan from the unit. Assemble pan in reverse order.
Replace hot gas interpiping gaskets before tightening flange bolts.