Heatcraft Screw Compressor Condensing Unit Installation and Operation Manual
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Installation and
Operations Manual
H-IM-SCU
October 2015
Part No. 25008501
Screw Compressor Condensing Units
Table of Contents
General Safety Information..............................................2
Inspection........................................................................2
Warranty Statement.........................................................2
Space and Location Requirements .................................3
Condensing Unit Rigging and Mounting..........................4
Head Pressure Control.....................................................4
Refrigerant Oils................................................................4
Recommended Refrigerant Piping Practices...................5
Refrigeration Pipe Supports ...........................................5
Suction Lines...................................................................6
Liquid Lines.....................................................................6
Unit Cooler Piping............................................................6
Line Sizing Tables........................................................ 7-9
Evacuation and Leak Detection.....................................10
Refrigerant Charging Instructions.................................10
Field Wiring....................................................................10
Check Out and Start Up.................................................11
Operational Check Out...................................................11
System Balancing-Compressor Superheat....................11
General Sequence of Operation............................... 12-17
System Troubleshooting Guide......................................18
Magnum Alarm and Safeties.........................................20
Magnum System Alarms................................................21
Setpoint Safety Alarms............................................ 21-22
Preventive Maintenance Guidelines..............................23
Typical Wiring Diagrams................................................24
InterLink™ Replacement Parts.....................................26
General Safety Information
1. Installation and maintenance to be performed only by qualified personnel who are familiar with this type of equipment.
2. All units are pressurized with dry air or inert gas.
All units must be evacuated before charging the system with refrigerant.
3. Make sure that all field wiring conforms to the requirements
of the equipment and all applicable national and local codes.
4. Avoid contact with sharp edges and coil surfaces.
They are a potential injury hazard.
5. Make sure all power sources are disconnected before any service work is done on units.
WARNING: Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
Inspection
Responsibility should be assigned to a dependable individual at the job site to receive
material. Each shipment should be carefully checked against the bill of lading. The
shipping receipt should not be signed until all items listed on the bill of lading have
been accounted. Check carefully for concealed damage. Any shortage or damages
should be reported to the delivering carrier. Damaged material becomes the delivering
carrier’s responsibility, and should not be returned to the manufacturer unless prior
approval is given to do so. When uncrating, care should be taken to prevent damage.
Heavy equipment should be left on its shipping base until it has been moved to the
final location. Check the serial tag information with invoice. Report any discrepancies
to your Heatcraft Refrigeration Products Sales Representative.
Warranty Statement
Seller warrants to its direct purchasers that products, including Service Parts,
manufactured by SELLER shall be of a merchantable quality, free of defects in
material or workmanship, under normal use and service for a period of one (1)
year from date of original installation, or eighteen (18) months from date of
shipment by SELLER, whichever first occurs. Any product covered by this order found
to Seller’s satisfaction to be defective upon examination at Seller’s factory will at
SELLER’s option, be repaired or replaced and returned to Buyer via lowest common
carrier, or SELLER may at its option grant Buyer a credit for the purchase price of the
defective article. Upon return of a defective product to SELLER’s plant, freight prepaid,
by Buyer, correction of such defect by repair or replacement, and return freight via
lowest common carrier, shall constitute full performance by SELLER of its obligations
hereunder.
SELLER shall have no liability for expenses incurred for repairs made by Buyer except
by prior, written authorization. Every claim on account of breach of warranty shall be
made to SELLER in writing within the warranty period specified above – otherwise
such claim shall be deemed waived. Seller shall have no warranty obligation
whatsoever if its products have been subjected to alteration, misuse, negligence,
free chemicals in system, corrosive atmosphere, accident, or if operation is contrary
to SELLER’s or manufacturer’s recommendations, or if the serial number has been
altered, defaced, or removed.
Motor Compressors
Motor compressors furnished by SELLER are subject to the standard warranty
terms set forth above, except that motor compressor replacements or exchanges
shall be made through the nearest authorized wholesaler of the motor compressor
manufacturer (not at SELLER’s factory) and no freight shall be allowed for
transportation of the motor compressor to and from the wholesaler. The replacement
motor compressor shall be identical to the model of the motor compressor being
replaced. Additional charges which may be incurred throughout the substitution of
other than identical replacements are not covered by this warranty. An optional, non
assignable, four (4) year extended compressor warranty may be purchased within
the boundaries of the United Sates of America, its territories and possessions, and
Canada. With this extended compressor warranty, replacements are administered by
an authorized compressor distributor only. Replacements within the first year of the
warranty area available through the distributor; the second through fifth years, the
purchaser must submit a proof-of-purchase of a compressor and supply it to Heatcraft
Refrigeration Products Warranty Claims for reimbursement.
Seller makes no express warranties except as noted above. All implied warranties
are limited to the duration of the Express Warranty. Liability for incidental and
consequential damages is excluded.
The forgoing is in lieu of all other warranties, express or implied, notwithstanding the
provisions of the uniform commercial code, the Magnuson-Moss Warranty - Federal
Trade Commission Improvement Act, or any other statutory or common law, federal or
state.
SELLER makes no warranty, express or implied, of fitness for any particular purpose,
or of any nature whatsoever, with respect to products manufactures or sold by seller
hereunder, except as specifically set forth above and on the face hereof. It is expressly
understood and agreed that SELLER shall not be liable to buyer, or any customer of
buyer, for direct or indirect, special, incidental, consequential or penal damages, or
for any expenses incurred by reason of the use or misuse by buyer or third parties of
said products. To the extent said products may be considered "consumer products,"
As defined in Sec. 101 of the Magnuson-Moss Warranty - Federal Trade Commission
Improvement Act, SELLER makes no warranty of any kind, express or implied, to
"consumers," except as specifically set forth above and on the face hereof.
The following conditions should be adhered to when installing this unit to maintain the
manufacturers warranty:
1.
2.
3.
4.
5.
6.
7.
2
System piping must be in accordance with good refrigeration practices.
Inert gas must be charged into the piping during brazing.
The power supply to the unit must meet the following conditions:
A. Three phase voltages must be +/- 10% of nameplate ratings.
B. Phase imbalance cannot exceed 2%.
All control and safety switch circuits must be properly connected according to the wiring diagram.
The factory installed wiring and piping must not be changed without written factory approval.
All equipment is installed in accordance with Heatcraft Refrigeration Products
specified minimum clearances.
© 2015 Heatcraft Refrigeration Products, LLC
Space and Location Requirements for
Air Cooled Condensing Units
The most important consideration which must be taken into account when
deciding upon the location of air-cooled equipment is the provision for a supply of
ambient air to the condenser, and removal of heated air from the condensing unit
or remote condenser area. Where this essential requirement is not adhered to,
it will result in higher head pressures, which cause poor operation and potential
failure of equipment. Units must not be located in the vicinity of steam, hot air or
fume exhausts. Corrosive atmospheres require custom designed condensers.
Another consideration which must be taken is that the unit should be mounted away
from noise sensitive spaces and must have adequate support to avoid vibration
and noise transmission into the building. Units should be mounted over corridors,
utility areas, rest rooms and other auxiliary areas where high levels of sound are
not an important factor. Sound and structural consultants should be retained for
recommendations.
Walls or Obstructions
Clearance From Walls or Obstructions
The unit should be located so that air may circulate freely and not be recirculated.
For proper air flow and access all sides of the unit should be a minimum of “W” away
from any wall or obstruction. It is preferred that this distance be increased whenever
possible. Care should be taken to see that ample room is left for maintenance work
through access doors and panels. Overhead obstructions are not permitted. When
the unit is in an area where it is enclosed by three walls the unit must be installed as
indicated for units in a pit.
Multiple Units
Clearance For Multiple Units Placed Side by Side
For units placed side by side, the minimum distance between units is the
width of the largest unit. If units are placed end to end, the minimum distance
between units is 4 feet.
Units in Pits
Clearance For Units in Pits
The top of the unit should be level with the top of the pit, and side distance
increased to “2W”. If the top of the unit is not level with the top of pit, discharge cones or stacks must be used to raise discharge air to the top of the
pit. This is a minimum requirement.
Decorative Fences
Clearance For Fence Enclosures
Fences must have 50% free area, with 1 foot undercut, a “W” minimum
clearance, and must not exceed the top ofunit. If these requirements are not
met, unit must be installed as indicated for “Units in pits".
© 2015 Heatcraft Refrigeration Products, LLC
3
Condensing Unit Rigging and Mounting
Rigging holes are provided on all units. Caution should be exercised when moving
these units. To prevent damage to the unit housing during rigging, cables or chains
used must be held apart by spacer bars. The mounting platform or base should be
level and located so as to permit free access of supply air.
Ground Mounting
Concrete slab raised six inches above ground level provides a suitable base. Raising
the base above ground level provides some protection from ground water and wind
blown matter. Before tightening mounting bolts, recheck level of unit. The unit should
in all cases be located with a clear space in all directions that is at a minimum, equal
to the height of the unit above the mounting surface. A condensing unit mounted in
a corner formed by two walls, may result in discharge air recirculation with resulting
loss of capacity.
The discharge pressure of the ORI valve must be adjusted to regulate the unit for
proper operating conditions. Adjust the ORI valve shown on the following diagram to
maintain a discharge pressure of 160 to 180 PSIG.“flooding” of the condenser with
liquid refrigerant reduces the available condensing surface, holding the condensing
pressure at the valve setting.
b. Ambient Fan Cycle Control
This is an automatic winter control method which will maintain a condensing pressure
within reasonable limits by cycling fan motors in response to outside air temperature.
The thermostat(s) should be field adjusted to shut off the fan when the condensing
temperature is reduced to approximately 90˚F. Table 1 lists approximate settings for
several system T.D.’s. These settings are approximate as they do not take into account
variations in load.
Roof Mounting
Operation and Adjustment
Due to the weight of the units, a structural analysis by a qualified engineer may be
required before mounting. Roof mounted units should be installed level on steel
channels or an I-beam frame capable of supporting the weight of the unit. Vibration
absorbing pads or springs should be installed between the condensing unit legs or
frame and the roof mounting assembly.
Condensing units with dual valves require sufficient charge to partially flood the
condenser during low ambient conditions.
Access
Sufficient access must provided to ensure future service of all major components is possible. The screw compressor, as well as some of the compressors removable components
are heavy enough to require additional lifting equipment for service. Care must be taken
during condensing unit placement to accommodate the use of service equipment for
maintenance or repair.
Valve adjustment should be made with gauges connected to the discharge port of
the compressor. Adjustments should be made during mild or low ambient conditions.
Turning the valve stem “clockwise” on the ORI valve will increase the discharge
pressure, while turning the valve stem “counterclockwise” will decrease the discharge
pressure.
If adjustments are made during warm ambient conditions, it may not be possible to
adjust the regulator valve as low as desired. Readjustment may be necessary once
cooler conditions prevail.
Oil Type
Pad Mounted Compressor
All units use pad mounted compressors. Check the compressor mounting bolts to
insure they have not vibrated loose during shipment. See Figure 4.
Figure 4. Pad Mount for Mobile or Deep Sump Application
Washer
Compressor for
Mounting Foot
BITZER Compact Screws are available in both standard CSH models for medium and
high temperature condensing applications. These compressors offer excellent part and
full load efficiencies.
A key aspect to utilizing these compressors to their fullest potential is specifying
the correct oil for your refrigerant. CSH screws may use BSE 170 oil in a variety of
refrigerants (R134a, R407C, R404A and R507A).
Table 2. Refrigeration Oils
Rubber
Head Pressure Control
Head pressure control is managed by the microprocessor controller. Fan management is constantly monitored and adjusted by the controller to maintain the target
head pressure.
As received, the POE lubricant will be clear or straw colored. After use, it may acquire
a darker color. This does not indicate a problem as the darker color merely reflects the
activity of the lubricant's protective additive.
ISO 170 (880 SUS) POE oil
OIL CHANGE
a. Dual Valve System
The system employs an ORI (open on rise of inlet pressure) valve and an ORD
(open on rise of differential pressure) valve. The high pressure discharge gas is
introduced above the liquid in the receiver tank. The receiver discharge is regulated
by the ORI valve.
AIR COOLED
CONDENSER
DRAIN
REGULATOR
BYPASS
REGULATOR
CHECK
VALVE
STD. LIQUID
LINE OUTLET
RECEIVER
DISCHARGE
LINE
DIP TUBE
COMPRESSOR
4
© 2015 Heatcraft Refrigeration Products, LLC
Polyol Ester Lubricants Hygroscopicity
Ester lubricants (POE) have the characteristic of quickly absorbing moisture from the
ambient surroundings. This is shown graphically in Figure 8 where it can be seen
that such lubricants absorb moisture faster and in greater quantity than conventional
mineral oils. Since moisture levels greater than 100 ppm will results in system
corrosion and ultimate failure, it is imperative that compressors, components,
containers and the entire system be kept sealed as much as possible. Lubricants
will be packaged in specially designed, sealed containers. After opening, all the
lubricant in a container should be used at once since it will readily absorb moisture
if left exposed to the ambient. Any unused lubricant should be properly disposed
of. Similarly, work on systems and compressors must be carried out with the open
time as short as possible. Leaving the system or compressor open during breaks or
overnight MUST BE AVOIDED!
Color
Figure 8.
8.
9.
L imit the soldering paste or flux to the minimum required to prevent contamination of the solder joint internally. Flux only the male portion of the connection, never the female. After brazing, remove excess flux.
If isolation valves are installed at the evaporator, full port ball valves should be used.
Refrigerant Pipe Support
1.
2.
3.
4.
5.
Normally, any straight run of tubing must be supported in at least two locations near each end of the run. Long runs require additional supports. The refrigerant lines should be supported and fastened properly. As a guide, 3/8 to 7/8 should be supported every 5 feet; 1-1/8
every 7 feet; and 1-5/8 and 2-1/8 every 9 to 10 feet.
When changing directions in a run of tubing, no corner should be left unsupported. Supports should be placed a maximum of 2 feet in each direction from the corner.
Piping attached to a vibrating object (such as a compressor or compressor base) must be supported in such a manner that will not restrict the movement of the vibrating object. Rigid mounting will fatigue the copper tubing.
Do not use short radius ells. Short radius elbows have points of excessive stress concentration and are subject to breakage at these points.
Thoroughly inspect all piping after the equipment is in operation and
add supports wherever line vibration is significantly greater than most of
the other piping. Extra supports are relatively inexpensive as compared to
refrigerant loss.
Figure 10. Condensing Unit / Compressor to Wall Support
Recommended Refrigerant Piping Practices
The system as supplied by Heatcraft Refrigeration Products, was thoroughly cleaned
and dehydrated at the factory. Foreign matter may enter the system by way of the
evaporator to condensing unit piping. Therefore, care must be used during installation
of the piping to prevent entrance of foreign matter.
Install all refrigeration system components in accordance with applicable local and
national codes and in conformance with good practice required for the proper operation of the system.
The refrigerant pipe size should be selected from the Line Sizing Tables. The interconnecting pipe size is not necessarily the same size as the stub-out on the condensing
unit or the evaporator.
The following procedures should be followed:
1.
Do not leave dehydrated compressors or filter-driers on condensing units
open to the atmosphere any longer than is absolutely necessary.
2.
Use only refrigeration grade copper tubing, properly sealed against contamination.
3.
Suction lines should slope 1/4" per 10 feet towards the compressor.
4.
Suitable P-type oil traps should be located at the base of each suction riser to enhance oil return to the compressor.
5.
For desired method of superheat measurement, a pressure tap should be installed in each evaporator suction line in the proximity of the expansion valve bulb.
6.
When brazing refrigerant lines, an inert gas should be passed through the line at low pressure to prevent scaling and oxidation inside the tubing. Dry nitrogen is preferred.
7.
Use only a suitable silver solder alloy on suction and liquid lines.
Figure 9. Example of Pipe Support
© 2015 Heatcraft Refrigeration Products, LLC
5
Suction Lines
Suction Line Risers
Horizontal suction lines should slope away from the evaporator toward the compressor
at the rate of 1/4 inch per 10 feet for good oil return. When multiple evaporators are
connected in series using a common suction line, the branch suction lines must enter
the top of the common suction line.
Prefabricated wrought copper traps are available, or a trap can be made by using two
street ells and one regular ell. The suction trap must be the same size as the suction
line. For long vertical risers, additional traps may be necessary. Generally, one trap
is recommended for each length of pipe (approximately 20 feet) to insure proper oil
movement. See Figure 11 for methods of constructing proper suction line P-traps.
For dual or multiple evaporator systems, the branch lines to each evaporator should
be sized for the evaporator capacity. The main common line should be sized for the
total system capacity.
Suction lines that are outside of refrigerated space must be insulated. See the Line
Insulation section on page 14 for more information.
Figure 12. Double Suction Riser Construction
Sized for
Minimum
Load
Sized for
Minimum
Load
Figure 11. Suction P-Traps
Sized
for Full
Load
Sized
for Full
Load
Slope 1/4"
per 10 ft.
toward
compressor
NOTE: A suction line trap must be installed at the point where piping changes the direction of refrigerant flow from any horizontal run to an upward vertical run.
Liquid Lines
Liquid lines should be sized for a minimum pressure drop to prevent “flashing”. Flashing in the liquid lines would create additional pressure drop and poor expansion valve
operation. If a system requires long liquid lines from the receiver to the evaporator or if the liquid has to rise vertically upward any distance, the losses should be calculated
to determine whether or not a heat exchanger is required. The use of a suction to liquid heat exchanger may be used to subcool the liquid to prevent flashing. This method of
subcooling will normally provide no more than 20˚F subcooling on high pressure systems. The amount of subcooling will depend on the design and size of the heat exchanger
and on the operating suction and discharge pressures. An additional benefit from the use of the suction to liquid type heat exchanger is that it can help raise the superheat in the
suction line to prevent liquid return to the compressor via the suction line. Generally, heat exchangers are not recommended on R- low temperature systems. However, they have
proved necessary on short, well insulated suction line runs to provide superheat at the compressor.
Determine line size 1 (main line from condensing unit):
Unit Cooler Piping
Pipe size example:
Given: 30*F Cooler with one system having (2) evaporators
• One condensing unit rated at 350,000 BTUH’s @ 20°F SST R404A refrigerant.
• Two evaporators each rated at 175,000 BTUH’s @ 10°F TD.
• 100 feet of actual line run between condensing unit to first evaporator
and 20 feet of actual line run between the first evaporator and the second
evaporator (see figure below).
How to figure line sizes:
1.
2.
3.
Determine equivalent line run = actual run + valves and fitting allowances.
Use Line Sizing Tables to size lines.
Note any special considerations.
1. Main line from the condensing unit to be sized for the total capacity (balance) of the whole system of 350,000 BTUH’s (Table 8).
2. Refer to 350,000@100 feet at 20°F SST R404A on the chart. You will find the suction line to be 2-5/8"and 1-3/8" liquid line.
3. Refer to Table 5. For every 1-3/8" 90° elbow you must add 7 equivalent feet of pipe and 4 equivalent feet of pipe for each 1-3/8" tee.
Therefore, total equivalent line run =
Actual line run
100 feet
+ (6) 2-5/8" elbows @ 4'
42 feet
+ (1) 2-5/8" tee @ 2.5'
2.5 feet
Total equivalent line run
146 feet
4. Refer to Table 8. For 126.5 total equivalent feet, the suction
line size should be 2-5/8" and the liquid line stays at 1-3/8" line.
NOTE: The gray shaded areas on Table 8. For 350,000 BTUH’s, the maximum suction riser is 2-5/8"to insure proper oil return and pressure drop from the bottom
p-trap to the top p-trap.
Determine line size 2 (evaporators):
Evap. 2
Evap. 1
Fittings in this system:
• (6) 90° elbows in main line plus a 90° turn through a tee.
• (5) additional 90° elbows to first evaporator.
• (4) additional 90° elbows to second evaporator.
6
1. Line sizing to each evaporator is based on 175,000 BTUH’s and equivalent run from condensing unit. First evaporator has an 105 ft. run and the second evaporator has a 120 ft. run.
2. Table 8 indicates 1-5/8" suction for the first evaporator and indicates 1-5/8" suction for the second evaporator.
3. Refer to Table 5. Each 1-5/8" 90° elbow adds 4 equivalent feet of pipe. Each 90° turn through a 1-5/8" tee adds 8 equivalent feet.
4. Actual line run (evap 1)105 feet
+ (5) 1-5/8" elbows @ 4'
20 feet
+ (1) 90° turn through tee @ 8'
6 feet
Total equivalent line run
133 feet
Actual line run (evap 2) 120 feet
+ (4) 1-5/8" elbows @ 3'
Total equivalent line run
16 feet
136 feet
5. Table 8 indicates 1-5/8" suction line and 1-1/8" liquid line from main line to both evaporators.
© 2015 Heatcraft Refrigeration Products, LLC
Line Sizing
The following Tables 6 and 7 indicate liquid lines and suction lines for all condensing units for R404A, R507, and R407C.
When determining the refrigerant line length, be sure to add an allowance for fittings. See Table 5. Total equivalent length of refrigerant lines is the sum of the actual linear footage and the allowance for fittings.
Table 3. Weight of Refrigerants in Copper Lines During Operation (Pounds per 100 lineal feet of type "L" tubing)
Line Size O.D.
(Inches)
Refrigerant
Liquid Line
Hot Gas Line
+20˚F
+40˚F
3/8
R507, 404A, R407C
3.4
0.31
0.09
0.13
1/2
R507, 404A, R407C
6.4
0.58
0.16
0.24
5/8
R507, 404A, R407C
10.3
0.93
0.25
0.35
7/8
R507, 404A, R407C
21.2
1.92
0.51
0.72
1-1/8
R507, 404A, R407C
36.1
3.27
0.86
1.24
1-3/8
R507, 404A, R407C
55.0
4.98
1.32
1.87
1-5/8
R507, 404A, R407C
78.0
7.07
1.86
2.64
2-1/8
R507, 404A, R407C
134
12.25
3.23
4.58
2-5/8
R507, 404A, R407C
209
18.92
5.00
7.07
3-1/8
R507, 404A, R407C
298
27.05
7.14
9.95
3-5/8
R507, 404A, R407C
403
36.50
19.65
13.67
4-1/8
R507, 404A, R407C
526
47.57
12.58
17.80
5-1/8
R507, 404A, R407C
812
73.43
19.42
27.48
Table 4. Pressure Loss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F)
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
Liquid Line Rise in Feet
30'
40'
˚F
PSIG
˚F
PSIG
˚F
4.1
1.1
6.1
1.6
8.2
2.1
10.2
2.7
Refrigerant
R507, R404A,
R407c
10'
15'
20'
25'
12.2
3.3
16.3
PSIG
50'
˚F
PSIG
˚F
100'
PSIG
˚F
20.4
5.6
30.6
8.3
40.8
11.8
4.1
75'
Based on 110˚F liquid temperature at bottom of riser.
Table 5. Equivalent Feet of Pipe Due to Valve and Fitting Friction
Copper Tube, O.D., Type “L”
1/2
5/8
7/8
1-1/8
1-3/8
1-5/8
2-1/8
2-5/8
3-1/8
3-5/8
4-1/8
5-1/8
6-1/8
Globe Valve (Open)
14
16
24
28
36
42
57
69
83
99
118
138
168
Angle Valve (Open)
7
9
12
15
18
21
28
34
42
49
57
70
83
90˚ Turn Through Tee
3
4
5
6
8
9
12
14
17
20
24
28
34
.75
1
1.5
2
2.5
3
3.5
4
5
6
7
9
11
1
2
2
3
4
4
5
7
8
10
12
14
16
Tee (Straight Through) or Sweep Below
90˚ Elbow or Reducing Tee (Straight Through)
© 2015 Heatcraft Refrigeration Products, LLC
7
Table 6. Recommended Suction Line Sizes for R-404A, R-407C*
Capacity
45 Degrees
40 Degrees
30 Degrees
25'
50'
75'
100'
150'
200'
250'
25'
50'
75'
100'
150'
200'
250'
25'
50'
75'
100'
150'
200'
250'
1000
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3000
3/8
3/8
3/8
3/8
3/8
1/2
1/2
3/8
3/8
3/8
3/8
1/2
1/2
1/2
3/8
3/8
3/8
1/2
1/2
1/2
1/2
4000
3/8
3/8
1/2
1/2
1/2
1/2
1/2
3/8
3/8
1/2
1/2
1/2
1/2
1/2
3/8
1/2
1/2
1/2
1/2
5/8
5/8
6000
1/2
1/2
1/2
1/2
1/2
5/8
5/8
3/8
1/2
1/2
1/2
5/8
5/8
5/8
1/2
1/2
1/2
5/8
5/8
5/8
5/8
9000
1/2
1/2
5/8
5/8
5/8
5/8
5/8
1/2
1/2
5/8
5/8
5/8
5/8
5/8
1/2
5/8
5/8
5/8
7/8
7/8
7/8
12000
1/2
5/8
5/8
5/8
5/8
7/8
7/8
1/2
5/8
5/8
7/8
7/8
7/8
7/8
5/8
5/8
5/8
7/8
7/8
7/8
7/8
15000
5/8
5/8
5/8
7/8
7/8
7/8
7/8
5/8
5/8
7/8
7/8
7/8
7/8
7/8
5/8
5/8
7/8
7/8
7/8
7/8
7/8
18000
5/8
7/8
7/8
7/8
7/8
7/8
7/8
5/8
7/8
7/8
7/8
7/8
7/8
7/8
5/8
7/8
7/8
7/8
7/8
7/8
7/8
24000
5/8
7/8
7/8
7/8
7/8
7/8
7/8
5/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
1 1/8
1 1/8
30000
7/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
7/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
36000
7/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
42000
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
48000
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
54000
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
60000
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
66000
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
72000
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
78000
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
84000
7/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
90000
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
120000
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
150000
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
180000
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
1 3/8
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
210000
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
1 3/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
240000
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
300000
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
360000
1 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
480000
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
600000
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
720000
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
2 1/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 1/8
2 1/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 1/8
900000
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 5/8
3 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
1200000
2 5/8
2 5/8
3 1/8
3 5/8
3 5/8
3 5/8
3 5/8
2 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
3 5/8
3 1/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
4 1/8
1400000
2 5/8
3 5/8
3 5/8
3 5/8
4 1/8
4 1/8
4 1/8
2 5/8
3 1/8
3 1/8
3 5/8
4 1/8
4 1/8
4 1/8
3 1/8
3 5/8
3 5/8
4 1/8
4 1/8
4 1/8
5 1/8
* NOTES:
1. Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not exceed horizontal size. Properly placed suction traps must also be used for adequate oil return. All sizes shown are for O.D. Type L copper tubing.
2. Suction line sizes selected at pressure drop equivalent to 2˚F. Reduce estimate of system capacity accordingly.
3. If system load drops below 40% of design, consideration to installing double suction risers should be made.
8
© 2015 Heatcraft Refrigeration Products, LLC
Table 7. Recommended Line Sizes for R-404A and R-407C*
Capacity
20 Degrees
10 Degrees
25'
50'
75'
100'
150'
200'
250'
25'
50'
75'
100'
150'
200'
250'
1000
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3000
3/8
3/8
3/8
1/2
1/2
1/2
1/2
3/8
3/8
1/2
1/2
1/2
1/2
1/2
4000
3/8
1/2
1/2
1/2
5/8
5/8
5/8
3/8
1/2
1/2
5/8
5/8
5/8
5/8
6000
1/2
1/2
1/2
5/8
5/8
5/8
5/8
1/2
1/2
5/8
5/8
5/8
5/8
5/8
9000
1/2
5/8
5/8
7/8
7/8
7/8
7/8
1/2
5/8
5/8
7/8
7/8
7/8
7/8
12000
5/8
5/8
7/8
7/8
7/8
7/8
7/8
5/8
7/8
7/8
7/8
7/8
7/8
7/8
15000
5/8
7/8
7/8
7/8
7/8
7/8
7/8
5/8
7/8
7/8
7/8
7/8
7/8
7/8
18000
5/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
24000
7/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
30000
7/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
36000
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
42000
7/8
7/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
48000
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
54000
7/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
60000
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
66000
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
72000
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 1/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
78000
1 1/8
1 1/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 1/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
84000
1 1/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 1/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
90000
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 1/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
120000
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
150000
1 3/8
1 5/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
180000
1 3/8
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
210000
1 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 1/8
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
240000
1 5/8
2 1/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
1 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
300000
1 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
360000
2 1/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
2 1/8
2 1/8
2 5/8
2 5/8
2 5/8
2 5/8
2 5/8
480000
2 1/8
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
2 1/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 1/8
600000
2 5/8
2 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 1/8
2 1/8
2 5/8
3 1/8
3 1/8
3 1/8
3 5/8
3 5/8
720000
2 5/8
2 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
2 5/8
3 1/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
900000
2 5/8
3 1/8
3 1/8
3 5/8
3 5/8
3 5/8
3 5/8
2 5/8
3 1/8
3 5/8
3 5/8
3 5/8
4 1/8
4 1/8
1200000
3 1/8
3 5/8
3 5/8
3 5/8
4 1/8
4 1/8
4 1/8
3 1/8
3 5/8
3 5/8
3 5/8
4 1/8
4 1/8
4 1/8
1400000
3 1/8
3 5/8
3 5/8
4 1/8
5 1/8
5 1/8
5 1/8
3 5/8
3 5/8
4 1/8
5 1/8
5 1/8
5 1/8
5 1/8
* NOTES:
1. Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not exceed horizontal size. Properly placed suction traps must also be used for adequate oil return. All sizes shown are for O.D. Type L copper tubing.
2. Suction line sizes selected at pressure drop equivalent to 2˚F. Reduce estimate of system capacity accordingly.
3. If system load drops below 40% of design, consideration to installing double suction risers should be made.
© 2015 Heatcraft Refrigeration Products, LLC
9
Evacuation and Leak Detection
Due to the smaller molecule size of HFC’s, they will tend to leak more readily than
CFC’s. Consequently, it is of the utmost importance that proper system evacuation and
leak detection procedures be employed.
Manufacturer recommendation is a minimum of 500 micron evacuation. In addition,
a vacuum decay test is strongly recommended to assure there is not a large
pressure differential between the system and vacuum pump. Good evacuation
processes include frequent vacuum pump oil changes and large diameter, short hose
connections to both high and low sides of the system preferably using bronze braided
hose. Leak detection can be carried out in the conventional manner. If HCFC or CFC
tracer gas is used, care must be taken to completely remove all traces of the gas prior
to introducing HFC’s.
Electronic leak detectors are now available that will sense HFC’s. This is considered
preferable since it removes the possibility of chlorine remaining in the system after
leak testing with HCFC’s and/or CFC’s. There is a view that even small quantities of
chlorine may act as a catalyst encouraging copper plating and/or corrosion and should
therefore be avoided.
Leak Testing
After all lines are connected, the entire system must be leak tested. The complete
system should be pressurized to not more than 150 psig with refrigerant and
dry nitrogen (or dry CO2). The use of an electronic type leak detector is highly
recommended because of its greater sensitivity to small leaks. As a further check
it is recommended that this pressure be held for a minimum of 12 hours and then
rechecked. For a satisfactory installation, the system must be leak tight.
Line Insulation
After the final leak test, refrigerant lines exposed to high ambient conditions should
be insulated to reduce heat pickup and prevent the formation of flash gas in the liquid
lines. Suction lines must always be insulated with 3/4" wall Armstrong “Armaflex” or
equal. When required, Liquid lines should be insulated with 1/2 inch wall insulation or
better. The insulation located in outdoor environments should be protected from UV
exposure to prevent deterioration of insulating value.
CAUTION: Do not use the refrigeration compressor to evacuate the
system. Do not start the compressor while it is in a vacuum.
Refrigerant Charging Instructions
1. Install a liquid line drier in the refrigerant supply line between the service gauge and the liquid service port of the receiver.
2. This extra drier will insure that all refrigerant supplied to the system is clean and dry.
3. When initially charging a system that is in a vacuum, liquid refrigerant can be added directly into the receiver tank.
4. Check equipment catalog for refrigerant capacity. System refrigerant capacity is 90% of receiver capacity. Do not add more refrigerant than the data tag indicates, unless the line run exceeds 25ft. Then, add additional refrigerant as per the chart on page 30. Weigh the refrigerant drum before charging so an accurate record can be kept of the weight of refrigerant put in the system.
5. Start the system and finish charging until the sight glass indicates a full charge and the proper amount has been weighed in. If the refrigerant must be added to the system through the suction side of the compressor, charge in vapor form only. Liquid charging must be done in the high side only or with liquid metering devices to protect the compressor.
NOTE: R-407c should be introduced into the system as a liquid.
Field Wiring
WARNING: All wiring must be done in accordance with applicable
codes and local ordinances.
The field wiring should enter the areas as provided on the unit. The wiring diagram for
each unit is located on the inside of the electrical panel door. All field wiring should
be done in a professional manner and in accordance with all governing codes. Before
operating unit, double check all wiring connections, including the factory terminals.
Factory connections can vibrate loose during shipment.
1. The serial data tag on the unit is marked with the electrical characteristic for wiring the unit.
2. Consult the wiring diagram in the unit cooler and in the condensing unit for proper connections.
3. Wire type should be of copper conductor only and of the proper size to handle the connected load.
4. The unit must be grounded.
Evacuation
A good, deep vacuum pump should be connected to both the low and high side
evacuation valves with copper tube or high vacuum hoses (1/4" ID minimum). If the
compressor has service valves, they should remain closed. A deep vacuum gauge
capable of registering pressure in microns should be attached to the system for
pressure readings.
A shut off valve between the gauge connection and vacuum pump should be provided
to allow the system pressure to be checked after evacuation. Do not turn off vacuum
pump when connected to an evacuated system before closing shut off valve.
The vacuum pump should be operated until a pressure of 1,500 microns absolute
pressure is reached — at which time the vacuum should be broken with the
refrigerant to be used in the system through a drier until the system pressure rises
above “0” psig.
NOTE: Refrigerant used during evacuation cannot be vented. Reclaim all used
refrigerant. EPA regulations are constantly being updated. Ensure your procedure
follows correct regulations.
Repeat this operation a second time.
Open the compressor service valves and evacuate the entire system to 500 microns
absolute pressure. Raise the pressure to 2 psig with the refrigerant and remove the
vacuum pump.
10
© 2015 Heatcraft Refrigeration Products, LLC
Check Out and Start Up
1. After the installation has been completed, the following points should be
covered before the system is placed in operation:
2. Check all electrical and refrigerant connections.
Be sure they are all tight.
3. Check compressor mounting fasteners for tightness.
4. Check microprocessor for operation of high and low pressure controls,
pressure regulating valves, oil pressure safety controls, and all other safety
controls, and adjust if necessary.
5. Wiring diagrams, instruction bulletins, etc., attached to the condensing units should be read and filed for future reference.
6. All fan motors should be checked for proper rotation. Fan motor mounts should be carefully checked for tightness and proper alignment.
7. Electric evaporator fan motors should be temporarily wired for continuous operation until the room temperature has stabilized.
8. Observe system pressures during charging and initial operation. Do not add oil while the system is short of refrigerant unless oil level is dangerously low.
9. Continue charging until system has sufficient refrigerant for proper operation. Do not overcharge. Remember that bubbles in a sight glass may be caused by a restriction as well as a shortage of refrigerant.
10. Do not leave unit unattended until the system has reached normal operating conditions and the oil charge has been properly adjusted to maintain the oil
within lower sight glass range.
11. Make sure all Schrader valve caps are in place and tight.
12. Make sure ALL service valves are properly back-seated and tighten valve packing if necessary.
CAUTION: Check phase rotation with phase meter prior to first start.
Warranty will be denied if damage is a result of reverse rotation. Extreme care
must be taken in starting compressors for the first time after system charging.
At this time, all of the oil and most of the refrigerant might be in the compressor
creating a condition which could cause compressor damage due to slugging.
Activating the crankcase heater for 24 hours prior to start-up is required.
System Balancing - Compressor Superheat
IMPORTANT: In order to obtain the maximum capacity from a system, and to ensure
trouble-free operation, it is necessary to balance each and every system.
This is extremely important with any refrigeration system.
The critical value which must be checked is suction superheat.
Suction superheat should be checked at the compressor as follows:
1. Measure the suction pressure at the suction service valve of the compressor
and determine the saturation temperature corresponding to this pressure from
a “Temperature-Pressure” chart.
2. Measure the suction temperature of the suction line about one foot back from
the compressor using an accurate thermometer.
3. Subtract the saturated temperature from the actual suction line temperature.
The difference is superheat.
Too low a suction superheat can result in liquid being returned to the compressor. This
will cause dilution of the oil and eventual failure of the bearings.
Too high a suction superheat will result in excessive discharge temperatures which
cause a break down of the oil and results in wear, and damage.
It should also be remembered that the system capacity decreases as the suction
superheat increases. For maximum system capacity, suction superheat should be
kept as low as is practical. We recommend that the superheat at the compressor be
between 5˚F and 15˚F.
If adjustments to the suction superheat need to be made, the expansion valve at the
evaporator should be adjusted.
NOTE: All adjustable controls and valves must be field adjusted to meet
desired operation. There are no factory preset controls or valve adjustments.
This includes low pressure, high pressure, adjustable head pressure systems
and expansion valves.
Operational Check Out
After the system has been charged and has operated for at least two hours at normal
operating conditions without any indication of malfunction, it should be allowed to
operate overnight on automatic controls. Then a thorough recheck of the entire system
operation should be made as follows:
1. Check compressor discharge and suction pressures. If not within system
design limits, determine why and take corrective action.
2. Check liquid line sight glass and expansion valve operation. If there are
indications that more refrigerant is required, leak test all connections and
system components and repair any leaks before adding refrigerant.
3. Observe oil level in compressor crankcase sight glass. Add oil as within lower sight glass range.
4. Thermostatic expansion valves must be checked for proper superheat settings.
Feeler bulbs must be in positive contact with the suction line and should be insulated. Valves set at high superheat will lower refrigeration capacity. Low
superheat promotes liquid slugging and compressor bearing washout.
5. Using suitable instruments, carefully check line voltage and amperage at the
compressor terminals. Voltage must be within 10% of that indicated on the
condensing unit nameplate. If high or low voltage is indicated, notify the power
company. If amperage draw is excessive, immediately determine the cause and take corrective action. On three phase motor compressors, check to see that a balanced load is drawn by each phase.
6. The maximum approved settings for high pressure controls on our air cooled condensing equipment is 425 psig. On air cooled systems, check as follows:
Disconnect the fan motors or block the condenser inlet air. Watch high pressure gauge for cutout point. Recheck all safety and operating controls for proper operation and adjust if necessary.
7. Check drain pan for proper drainage.
8. Check winter head pressure controls for pressure setting.
9. Check oil sump heater operation
10. Install instruction card and control system diagram for use of building manager
or owner.
© 2015 Heatcraft Refrigeration Products, LLC
11
General Sequence of Operation
1. At power up the Magnum will not start it’s algorithm until Set Point.23, POWER UP
DELAY, time has been satisfied.
b. If the ROC indicates a sufficient decrease in Supply Air Temperature (ROC < Set Point #27 “Mac Roc-”) the capacity control logic stops loading and holds the current capacity.
2. At start up the MAGNUM verifies the ‘NO RUN CAPACITY CONTROL STATES’.
c. If the supply air temperature is below the control zone, special logic functions
to keep the condensing unit’s within the control zone.
3. If anyone of the ‘NO RUN CAPACITY CONTROL STATES’ is not satisfied, the follow-
ing sequence occurs:
d. If the supply air temperature is below the control zone and if the Supply
Air Temp. Rate of Change (ROC) is not indicating the supply air temperature is
already increasing at a sufficient rate, the condensing unit’s capacity control
logic ask for less capacity by subtracting from the “Steps Wanted On”
parameter. Once “Step Wanted On” parameter has been decreased the
capacity control logic has a time delay before allowing the “Steps Wanted On” to be decreased again. The time delay is dependant on how far away the
temperature is from target, Set Points #25 “STEP SENSIT” and Set Point #26
“STEP DELAY”
a. All compressors are not allowed to run. Any running compressor which has
satisfied it’s minimum run time (set point # 64) will have its liquid line solenoid
turned off and the compressor turned off. (Pump down will occur if enabled).
b. The evaporator fan continues to run for 60 seconds (Set Point# 108 “PUMP
DELAY”) after the last compressor is turned off.
4. If all of the ‘NO RUN CAPACITY CONTROL STATES’ are satisfied, the capacity control logic is now allowed to run to maintain the Supply Air Temperature
(or optionally Return or Zone Temperature) within the control zone defined by:
a. Set point #1 “CTL TARGET”
b. Set point #2 “CTL ZONE+”
c. Set point #3 “CTL ZONE-”
5. The Capacity control logic will increase or decrease the compressors
WANTED ON versus ACTUAL ON’ and maintain the compressors required.
Capacity control logic for loading & unloading the chiller is as follows:
a. If the Supply Air Temperature is above the control zone and the Supply Air
Temp. Rate of Change (ROC) is not indicating the supply air temperature is
already decreasing at a sufficient rate, the condensing unit’s capacity control
logic will ask for more capacity by adding to the “Steps Wanted On”
parameter. Once “Steps Wanted On” parameter has been increased the
capacity control logic has a time delay before allowing the “Steps Wanted ON” to be increased
Ҋagain. The time delay is dependent on how far away the
temperature
is
from
target. Set Points #25 ‘STEP SENSIT’ and Set Point #26 Ҋ
“STEP DELAY”
p
p
e. If the ROC is indicating a sufficient increase in Supply Air Temperature
(ROC < Set Point #27 “MAX ROC-” the capacity control logic stop in loading and holds the current capacity.
6. Once it has been determined that a compressor is wanted on the MAGNUM
reviews the ‘NO RUN CIRCUIT CONTROL STATES’ to an available compressor, MAGNUM software runs its compressor control logic every second starting with
the lead compressor. If a compressor is allowed to run (not locked out, tripped on
a safety or disabled by pump down and /or flow switches) and the MAGNUM
wants the compressor to run {“Steps Turned On is less than “Steps Wanted On”)
the compressor is started.
7. The condenser fan control logic runs once every second. Pumps and fans are
cycled based on the compressor(s) discharge pressure and Set Point #45 to #55, depending on condenser type.
8. The Capacity State & Circuit Compressor State can be viewed via the ‘STATUS’
option under the ‘Menu” key on the MAGNUM keypad or using PC-Connect soft
ware on a Windows based computer.
Ҋ
Ҋ STATE
CURRENT
OF THE PACKAGE (Press ‘Menu’, position arrows to ‘Status’ Press Enter key
)
The display show the current capacity of the package and how long we have been at this level.
p
By pressing
the PGi
you p
will get an additional
information
on each circuit.
DESCRIPTION
ACTUAL DISPLAY
n
p
np
n
p
n
p
CURRENT STATE OF THE CIRCUIT The display shows the current capacity of circuit (x) and how long we have
been at this level. By pressing the F2 you will go back to the Chiller state display OR F3 you will get additional information on this circuit.
ACTUAL DISPLAY
12
DESCRIPTION
np
np
n
p
n
p
© 2015 Heatcraft Refrigeration Products, LLC
n
p
n
p
CURRENT STATE OF THE CIRCUIT (cont.)
ACTUAL DISPLAY
DESCRIPTION
nn p p
9. The safeties (Comp no Stop, Phase Loss, Emergency Stop, High Sump Water
Temperature) are checked once every second. (All of the safeties are options
features). Once a safety has occurred the user is required to correct the problem and reset the unit using the ‘Lckout RST’ from the Menu on the MAGNUM’s key
pad.
10. If the compressor relay output is turned on, either by computer or manual, the
compressor safeties are checked once every second. The following compressor safeties are supported:
a. Low & Unsafe Suction Pressure
b. Low & Unsafe Differential Oil Pressure
c. Low & High Discharge Pressure
d. High Discharge, Oil and Motor Temperatures
e. Low & High Motor Ampere
f. No Compressor Proof
g. Freeze protection for split barrels units
© 2015 Heatcraft Refrigeration Products, LLC
13
REVISION
REVISION
2.4 2.4
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
To reach
the
Main
Menu press the Menu button after powering up.
REVISION
2.4 2.4
GETTING
STARTED
MANUAL
REVISION
GETTING
STARTED
MANUAL
Keypad
Display
Screens
Keypad
Display
Screens
REVISION
2.4 2.4
GETTING
STARTED
MANUAL
REVISION
GETTING
STARTED
MANUAL
Based on the highlighted menu option when the Enter key
is pressed it will bring up one fo the following
REVISION
GETTING
STARTED
MANUAL
REVISION
GETTING
STARTED
MANUAL
screens.
To
reach
the
Main
Menu
press
the Menu
after powering
up. Based
the highlighted
the enter
is 2.4
Keypad
Display
Screens
To
reach
the
Main
Menu
press
the Menu
buttonbutton
after powering
up. Based
on theonhighlighted
menu menu
optionoption
when when
the enter
key ( key
) is ( ) 2.4
Keypad
Display
Screens
Keypad
Display
Screens
Keypad
Display
Screens
pressed
will
bring
up
one
of
the
following
screens.
pressed will
bring up
one of the following screens.
MENU
KEY
To
reach
the
Main
Menu
press
the Menu
buttonbutton
after powering
up. Based
on theonhighlighted
menu menu
optionoption
when when
the enter
key ( key
) is ( ) is
Keypad
Display
Screens
Keypad
Display
Screens
To
reach
the
Main
Menu
press
the Menu
after powering
up. Based
the highlighted
the enter
To reach
the
Main
Menu
press press
the Menu
buttonbutton
after powering
up. Based
on theonhighlighted
menu menu
optionoption
when when
the enter
key ( key
) is ( ) is
To reach the Main Menu
the Menu
after powering
up. Based
the highlighted
the enter
Pressing
the
Key
shows
the
following:
Menu
pressed
will
bring
up one
the offollowing
screens.
Menu
Key
pressed
willKey
bring
upofMenu
one
the following
screens.
To
reach
the
Main
the
Menu
button
after powering
up. Based
the highlighted
the enter
pressed
will
bring
up
oneMenu
of
thepress
screens.
pressed
will
bring
one
offollowing
the
following
screens.
To
reach
the
Main
Menu
press
the
Menu
button
after powering
up. Based
on theonhighlighted
menu menu
optionoption
when when
the enter
key ( key
) is ( ) is
Pressing
the
Pressing
the up
Menu
Key
pressed
will
bring
up
one
of
the
following
screens.
Menu
Key
pressed will
bring up
one
of the
following
screens.
DISPLAY
ACTUAL
DISPLAY
DESCRIPTION
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
MenuACTUAL
Key Key
Menu
Pressing
the the
Pressing
Menu
Keythe the
MenuPressing
KeyPressing
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
09:56
Main
Menu
HH:MM
Screen
Title
09:56
Main
Menu
HH:MM
Screen
Title
Pressing
the
ACTUAL
DISPLAY
DESCRIPTION
DISPLAY
DESCRIPTION
Pressing
the ACTUAL
-Status
-Setpoints
-Control
Status
Display-Active
-Active
Setpoints
Display
-Status
-Setpoints
-Control
Status
Display
Setpoints
Display
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
09:56
Main
Menu
HH:MM
Screen
Title
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
Display
09:56
Main
Menu
HH:MM
Screen
Title
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
Display
09:56
Menu-Lckout
HH:MM
Screen
Title
09:56MainMain
Menu RST RST
HH:MM
Screen
Title
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
-Inputs
-Sensor
Input
Display
-Lockout
Reset
Display
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
-Inputs
-Lckout
-Sensor
Input
Display
-Lockout
Reset
Display
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
09:56
Main
Menu
HH:MM
Screen
Title
09:56
Main -Lckout
Menu-Lckout
HH:MM
Screen Title
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
Display
-Alarms
ALM
-Alarm
Display
-Lockout
Alarm
Display
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
-Alarms
ALM
-Alarm
Display
-Lockout
Alarm
Display
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
Display
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
Display
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
-Status
-Setpoints
-Control
Status
Display
-Active
Setpoints
Display
-Inputs
-Lckout
RST
-Sensor
Input
Display
-Lockout
Reset
Display
-Graphs
-Passwords
-Graphing
Display
-Password
Display
-Inputs -Passwords
-Lckout RST
-Sensor
Input
Display -Password
-Lockout
Reset
Display
-Graphs
-Graphing
Display
Display
-Inputs
-Lckout
RST
-Sensor
Input
Display
-Lockout
Reset
Display
-Inputs
-Lckout
RST
-Sensor
Input
Display -Lockout
-Lockout
Reset
Display
-Outputs -Lckout
-Serv
Tools
-Relay/Analog
-Service
Tools
-Outputs
-Serv
Tools
-Relay/Analog
Display
-Service
Tools
-Alarms
ALM
-Alarm
Display
Alarm
Display
Help
Help
-Alarms
-Lckout
ALM
-Alarm
Display
-Lockout
Alarm
Display
Help
Help
-Alarms
-Lckout
ALM RST
-Alarm
Display
-Lockout
Alarm
Display
-Alarms -Passwords
ALM
-Alarm
Display
Alarm
-Inputs
-Lckout
-Sensor
Input
Display -Password
-Lockout
Reset
Display
-Inputs
-Lckout
RST
-Sensor
Input
Display
-Lockout
Reset
Display
-Graphs
-Graphing
Display
Display
-Graphs
-Passwords
-Graphing
Display
-Password
Display
-Graphs
-Passwords
-Graphing
Display
-Password
Display
-Graphs
-Passwords
-Graphing
Display
-Password
Display
-Alarms
-Lckout
ALM
-Alarm
Display
-Lockout
Alarm
Display
-Alarms
-Lckout
ALM
-Alarm
Display
-Lockout
Alarm
Display
Help
Help
Help
Help
Help
Help
Status
Help
Help Display
-Graphs
-Passwords
Status
-Graphing
Display
-Password
Display
-Graphs
-Passwords
-Graphing
-Password
Display
Selecting
the 'Status'
the following
screen:
Selecting
the 'Status'
menu menu
optionoption
showsshows
the following
ChillerChiller
StatusStatus
screen:
HelpHelp
HelpHelp
STATUS
Status
Status
Selecting
the 'Status'
menu menu
optionoption
showsshows
the following
ChillerChiller
StatusStatus
screen:
Status
Status
Selecting
the 'Status'
thefollowing
following
screen:
DESCRIPTION
Selecting
the
Status
Menu
option
shows
Chiller
Status
screen:
Selecting
the
'Status'
menu menu
optionoption
shows
the the
following
ChillerChiller
StatusDESCRIPTION
screen:
Selecting
the 'Status'
shows
the following
Status
screen:
ACTUAL
DISPLAY
ACTUAL
DISPLAY
Status
Status
Selecting
the 'Status'
the following
Status
screen:
Selecting
the 'Status'
menu menu
optionoption
showsshows
the following
ChillerChiller
Status
screen:
DESCRIPTION
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
09:56
Unit
23/35
HH:MM DESCRIPTION
CHILLER
LEV/ENT
09:56
UnitDISPLAY
23/35
ACTUAL
DISPLAY
HH:MM
CHILLER
UNITUNIT
LEV/ENT
DESCRIPTION
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
DISPLAY
IS LOADED
CURRENT
CONTROL
STATE
UNITUNIT
IS LOADED
CURRENT
CONTROL
STATE
DESCRIPTION
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
DISPLAY
09:56
Unit
23/35
HH:MM
CHILLER
UNITSTATE
LEV/ENT
09:56
Unit
23/35
IN
CURRENT
HH:MM
CHILLER
UNITSTATE
LEV/ENT
002:26:18
TIMETIME
IN
CURRENT
002:26:18
09:56
Unit
23/35
09:56
Unit
23/35
HH:MM
CHILLER
UNITSTATE
LEV/ENT
HH:MM
CHILLER
UNIT
LEV/ENT
UNIT
IS
LOADED
CURRENT
CONTROL
UNIT
IS
LOADED
WANTED
ACTUAL
WANTED%
DELAY
SLOPE
CURRENT
CONTROL
STATE
WANTED
ACTUAL
WANTED%
DELAY
SLOPE
ACT
WTD%
DLY
ROC
WTD WTD
ACT
WTD%
DLY
ROC
UNIT
IS
LOADED
CURRENT
CONTROL
STATE
UNIT
IS
LOADED
09:56
Unit
23/35
CURRENT
CONTROL
STATE
HH:MM
CHILLER
UNIT
LEV/ENT
09:56
Unit
23/35
HH:MM
CHILLER
UNIT
LEV/ENT
TIMETIME
INACTUAL%
CURRENT
STATE
#STEPS #STEPS
#STEPS
NEXT
DIRECTION
INACTUAL%
CURRENT
STATE
#STEPS
NEXT
CHG CHG
DIRECTION
1 1 002:26:18
1 002:26:18
100%
300
1
100%
300
0.0 0.0
TIME
INSET
CURRENT
STATE
002:26:18
UNIT
IS
LOADED
TIME
IN
CURRENT
CURRENT
CONTROL
STATE
002:26:18
UNIT
IS
LOADED
CURRENT
CONTROL
STATE
WANTED
ACTUAL
WANTED%
DELAY
SLOPE
TARGET
POINT
+
TARGET
RESET
WTD WTD
ACTTARG=27.0
WTD%
DLY DLY
ROC ROC
WANTED TARGET
ACTUAL
WANTED%
SLOPE
SET POINT
+ TARGET DELAY
RESET
ACT
WTD%
TARG=27.0
WANTED
ACTUAL
WANTED%
DELAY
SLOPE
WANTED#STEPS
ACTUAL
WANTED%
DELAY
SLOPE
IN
CURRENT
WTD
ACT ACT
WTD%
DLY DLY
ROC ROC
002:26:18
WTD%
TIMETIME
INACTUAL%
CURRENT
#STEPS
NEXT
CHG
DIRECTION
Page
UpSTATE
Page
#STEPS
#STEPS
ACTUAL%
NEXT
CHG
DIRECTION
Page
UpSTATE
Page
DownDown
1 WTD
100%
300
0.0
1 1 002:26:18
1 PG
100%
300
0.0
PG
PG
PG
#STEPS
#STEPS
ACTUAL%
NEXT
CHG
DIRECTION
#STEPS
#STEPS
ACTUAL%
NEXT
CHG
DIRECTION
WANTED
ACTUAL
WANTED%
DELAY
WTD
ACT
WTD%
DLY
ROC
WANTED
ACTUAL
WANTED%
DELAY
SLOPE
1
1
100%
300
0.0
TARGET
SET
POINT
+
TARGET
RESET
1 TARG=27.0
100%
WTD 1ACTTARG=27.0
WTD%
DLY 300
ROC 0.0
TARGET SET POINT + TARGET RESET SLOPE
TARGET
SET SET
POINT
+ Up
TARGET
RESET
TARGET
POINT
+
TARGET
#STEPS #STEPS
#STEPS
ACTUAL%
NEXT
CHG
DIRECTION
#STEPS
ACTUAL%
NEXT
CHG RESET
DIRECTION
Page
Page
DownDown
1 1 TARG=27.0
1 PG
100%
300
Page
Up
Page
TARG=27.0
1
100%
300
0.0
PG 0.0
PG
PG
Page
Up
PagePage
DownDown
Page
Up
TARGET
SET
POINT
+
TARGET
RESET
TARGET
Pressing
theTARG=27.0
PageTARG=27.0
Down
button
the following
screen: SET POINT + TARGET RESET
PG
PG
Pressing
the Page
Down
button
showsshows
the following
CircuitCircuit
StatusStatus
screen:
PG
PG
PG
PG
PG
PG
PG
PG
PG
PG
PagePage
Up Up
PagePage
DownDown
Pressing
the
Page
Down
buttonbutton
showsshows
the following
CircuitCircuit
StatusStatus
screen:
Pressing
the
Page
Down
the following
screen:
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
Pressing
the
Page
button
shows
theCircuit
following
Circuit
Status
screen:
Pressing
the
Page
Down
buttonbutton
showsshows
the
following
StatusStatus
screen:
Pressing
the
PageDown
Down
the following
Circuit
screen:
Pressing
the
Page
Down
button
shows
the
following
Circuit
Status
screen:
Pressing
the
Page
Down
button
shows
the
following
Circuit
Status
screen:
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1 23/35
23/35
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
DISPLAY
DESCRIPTION
DESCRIPTION
CURRENT
CONTROL
STATE
IS HOLDING
CURRENT
CONTROL
STATE
CMP CMP
IS HOLDING
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
HH:MM
LEV/ENT
09:56
CMP
#1
INCIRCUIT
CURRENT
STATE
HH:MM
LEV/ENT
09:56
CMP
#1 23/35
23/35
TIMETIME
INCIRCUIT
CURRENT
STATE
002:26:18
002:26:18
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1
23/35
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1
23/35
CURRENT
CONTROL
STATE
CMP
IS
HOLDING
SUCTION
DISCHARGE
OIL
DIFFERENTIAL
MOTOR
CURRENT
CONTROL
STATE
CMP
IS
HOLDING
SUCTION
DISCHARGE
OIL
DIFFERENTIAL
MOTOR
DISC
OPD
MOTOR
SUCTSUCT
DISC
OPD
MOTOR
CURRENT
CONTROL
STATE
CMP
IS
HOLDING
CURRENT
CONTROL
STATE
CMP
IS
HOLDING
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1
23/35
HH:MM
CIRCUIT
LEV/ENT
09:56
CMP
#1
23/35
TIME
IN
CURRENT
STATE
002:26:18
PRESSURE PRESSURE
PRESSURE
PRESSURE
%
TIME IN CURRENT
STATE
PRESSURE
PRESSURE
AMP AMP
%
002:26:18
222P
156P
44P 44P
222P
156P
101%101%
TIME
IN CURRENT
STATE
TIME
INOIL
CURRENT
STATE
CURRENT
CONTROL
002:26:18
CMP
IS
HOLDING
002:26:18
CURRENT
CONTROL
STATE
SUCTION
DISCHARGE
DIFFERENTIAL
MOTOR
CMP
IS
HOLDING
TEMPERATURE
TEMPERATURE
STATUS
STATUS
SUCTION
DISCHARGE
OIL
DIFFERENTIAL
MOTOR
TEMPERATURE
TEMPERATURE
STATUS
STATUS
SUCT
DISC
OPD
MOTOR
SUCT
DISC
OPD
MOTOR
33F
177F
OK
OK
33FSUCT
177F
OK OPD
OKMOTOR
SUCTION
OIL
DIFFERENTIAL
MOTOR
SUCTION DISCHARGE
DISCHARGE
OIL
DIFFERENTIAL
MOTOR
TIME
INPage
CURRENT
STATE
SUCT
DISC
OPD
MOTOR
002:26:18
TIME
INPage
CURRENT
STATE
PRESSURE
PRESSURE
PRESSURE
AMPPage
%
DISC
002:26:18
Up
Down
PRESSURE
PRESSURE
PRESSURE
AMP
%
Up
Page
Down
44P 44P
222P
156P
101%
222P
156P
101%
PG
PG
PG
PG
PRESSURE
PRESSURE
PRESSURE
AMPMOTOR
%
PRESSURE
PRESSURE
PRESSURE
AMP
%
SUCTION
DISCHARGE
OIL
DIFFERENTIAL
SUCTION
DISCHARGE
OIL
DIFFERENTIAL
MOTOR
TEMPERATURE
TEMPERATURE
STATUS
STATUS
44P
222P
156P
101%
SUCT
DISC
OPD
MOTOR
44P
222P
156P
101%
TEMPERATURE TEMPERATURE
STATUS
STATUS
SUCT
DISC177F
OPD
MOTOR
33F 33F
177F
OK OK
OK OK
TEMPERATURE
STATUS
STATUS
TEMPERATURE
TEMPERATURE
STATUS
STATUS
PRESSURE TEMPERATURE
PRESSURE
PRESSURE
AMP
%
PRESSURE
PRESSURE
PRESSURE
AMP
%
Page
Up
Page
Down
Page
Up
Page
Down
44P
222P
156P
101%
33F
177F
OK
OK
33F
177F
OK
OK
44P 222P PG
156P
PG PG
PG 101%
Page
Up
Page
Down
Page
Up
Page
Down
TEMPERATURE
TEMPERATURE
STATUS
STATUS
TEMPERATURE
TEMPERATURE
STATUS
STATUS
Pressing
the Down
Page
Down
button
theCircuit
next Circuit
screen:
Pressing
the33F
Page
button
shows
theOK
next
StatusStatus
screen:
PG
PG
177F
OK
PG
33F
177F
OK PG
OKshows
PagePage
Up Up
Pressing
the Page
Down
buttonbutton
showsshows
the next
StatusStatus
screen:
Pressing
the
Page
Down
theCircuit
next Circuit
screen:
ACTUAL
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
Pressing
the
Page
Down
buttonbutton
showsshows
the next
StatusStatus
screen:
Pressing
the
Page DISPLAY
Down
theCircuit
next Circuit
screen:
Pressing the Page Down button shows the next Circuit Status screen:
Pressing
the
Page
Down
button
shows
the
next
Circuit
Status
screen:
Pressing the
Page
Down
button
shows the
next Circuit StatusHH:MM
screen: DESCRIPTION
ACTUAL
DISPLAY
CIRCUIT
ACTUAL
DISPLAY
DESCRIPTION
09:55
CMP
#1 45/54
45/54
HH:MM
CIRCUIT
09:55
CMP
#1
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
CURRENT
CONTROL
STATE
CMP
OFF/READY
CURRENT
CONTROL
STATE
CMP OFF/READY
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
DISPLAY
DESCRIPTION
HH:MM
DESCRIPTION
09:55
CMP
#1
TIME
INCIRCUIT
CURRENT
STATE
HH:MM
000:00:42
09:55
CMP
#1 45/54
45/54
TIME
INCIRCUIT
CURRENT
STATE
000:00:42
09:55
#1
45/54
09:55 CMP
CMP
#1
45/54
OFF/READY
SSH
SCT DSH DSH
OFF/READY
SST SST CMP
SSH CMP
SCT
CMP
OFF/READY
CMP
OFF/READY
09:55
CMP
#1
09:55
CMP
#1
45/54
000:00:42
38
16.9
97
79.2
000:00:42
38
16.9
97
79.245/54
000:00:42
000:00:42
CMP
OFF/READY
CMP
OFF/READY
SST SST SSH
SCT
SSH
SCT DSH DSH
SST
SSH
SCT SCT79.2
DSH DSH
SSH
000:00:42
000:00:42
38 SST
16.9
97
38
16.9
97
PG
PG
PG
PG79.2
38 SST
16.9
38
SSH 97
SCT 79.2
DSH
SST
SSH16.9
SCT 97
DSH 79.2
97 79.2
38 38
16.916.9
97 PG
PG
PG79.2
PG
PG PG
PG PG
PG PG
PG PG
14
PagePage
DownDown
LEV/ENT
LEV/ENT
LEV/ENT
LEV/ENT
HH:MM
CIRCUIT
LEV/ENT
HH:MM
CIRCUIT
LEV/ENT
CURRENT
CONTROL
STATE
SAT.SUCT.
SUCT
SHEAT
SAT.COND.
SHEAT
CURRENT
CONTROL
STATE DISCDISC
SAT.SUCT.
SUCT
SHEAT
SAT.COND.
SHEAT
CURRENT
CONTROL
STATE
CURRENT
CONTROL
STATE
HH:MM
LEV/ENT
HH:MM
CIRCUIT
LEV/ENT
TIME
IN
CURRENT
STATE
TEMP
TEMP
TEMP
TEMP
TIME
IN CIRCUIT
CURRENT
STATE
TEMP
TEMP
TEMP
TEMP
TIMESHEAT
IN CONTROL
CURRENT
STATE
TIME
IN CONTROL
CURRENT
CURRENT
STATE DISCDISC
CURRENT
STATE
SAT.SUCT.
SAT.COND.
SHEAT
SAT.SUCT. SUCT
SUCT
SHEAT
SAT.COND.
SHEAT
SAT.SUCT.
SUCT
SHEAT
SAT.COND.
DISC
SHEAT
SAT.SUCT.
SUCT
SHEAT
SAT.COND.
DISC
SHEAT
TIME
IN
CURRENT
STATE
TIME
IN
CURRENT
STATE
TEMP
TEMP
TEMP
TEMP
Page
Up
Page
Down
TEMP
TEMP Page Up
TEMP
TEMP
Page
Down
TEMP
TEMP
TEMP
TEMP
TEMP
TEMP
TEMP DISC
TEMP
SAT.SUCT.
SUCT
SHEAT SAT.COND.
SAT.COND.
DISC
SHEAT
SAT.SUCT.
SUCT
SHEAT
SHEAT
TEMP
TEMPTEMP
TEMPTEMPPagePage
TEMPPage
Up TEMP
Page
DownDown
Up TEMP
PagePage
Up Up
PagePage
DownDown
Page
Up
Page
Page Up
Page DownDown
© 2015 Heatcraft Refrigeration Products, LLC
GETTING
GETTING
STARTED
STARTED
MANUAL
MANUAL
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
Pressing
Pressing
the Page
the Page
Down
Down
button
button
shows
shows
the following
the following
Liquid
Liquid
LineLine
Solenoid
Solenoid
Status
Status
screen:
screen:
Pressing
the
Page
Down
button
shows
the
following
Liquid
Line
Solenoid
Status
screen:
Pressing
the
Page
Down
button
shows
the
following
Liquid
Line
Solenoid
Status
screen:
Pressing the Page Down button shows the following Liquid Line Solenoid Status screen:
Pressing
the ACTUAL
Page
Down
button
shows
the
following
Liquid
Line Line
Solenoid
Status
screen:
ACTUAL
DISPLAY
DISPLAY
DESCRIPTION
DESCRIPTION
Pressing
the Page
Down
button
shows
the following
Liquid
Solenoid
Status
screen:
ACTUAL
DISPLAY
ACTUAL
DISPLAY DESCRIPTION
DESCRIPTION DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL DISPLAY
DESCRIPTION
DISPLAY
DESCRIPTIONHH:MM
09:55
09:55ACTUAL
LLSLLS
#1 #1
45/54
45/54
HH:MM
LIQUID
LIQUID
LINE
LINE
SOLENOID
SOLENOID
IS
HOLDING
HOLDING
09:55
LLS
#1
45/54
09:55
LLS
#1
45/54
09:55 IS
LLS
#1
45/54
09:55
LLS
#1
45/54
002:43:42
002:43:42
IS
HOLDING
IS
HOLDING
09:55
LLS
#1
45/54
IS
HOLDING
HOLDING
09:55IS
LLS
#1
45/54
Suction
Suction
Info
Info
002:43:42
002:43:42
IS
HOLDING
002:43:42
002:43:42
IS
HOLDING
PRES
PRES Suction
SST
SST
TEMP
TEMP
Suction
Info
Suction
Info
002:43:42
Suction
InfoSSHSSH
Info
002:43:42
14.0P
14.0P
60F
60F
12F
12F
47.0
47.0
PRES
SST
TEMP
SSH
PRES
SST
TEMP
SSH
Info
PRES Suction
SSTTEMP
TEMP
SSH
PRES
SST
SSH
Suction
Info
14.0P
60F
12F
47.0
PG
PG
PG
PG
14.0P
60F
12F
47.0
PRES
SST
TEMP
SSH
14.0P
12F
47.0
14.0P
47.0
PRES 60F 60F
SST 12FTEMP
SSH
14.0P
60F
12F
47.0
PG
PG
PG
PG
PG
PG
14.0P
60F
12F PG47.0
PG
PG PG
PG PG
Outputs
Outputs
REVISION
REVISION
2.4 2.4
REVISION
REVISION
2.4 2.4
REVISION
2.4
REVISION
2.4
REVISION
2.4 2.4
REVISION
LEV/ENT
LEV/ENT
CURRENT
CURRENT
CONTROL
CONTROL
STATE
STATE
LIQUID
LINE
SOLENOID
LEV/ENT
LIQUID
LINE
SOLENOID
LEV/ENT
LIQUID
LINE
SOLENOID
LEV/ENT
LIQUID
LINE
SOLENOID
LEV/ENT
TIME
TIME
INLINE
IN
CURRENT
CURRENT
STATE
STATE
CURRENT
CONTROL
STATE
CURRENT
CONTROL
LIQUID
SOLENOID
LEV/ENT
CURRENT
CONTROL
STATE
CURRENT
CONTROL
STATE
LIQUID
LINE
SOLENOID
LEV/ENT
TIME
IN
CURRENT
STATE
TIME
IN CURRENT
CURRENT
STATE
CURRENT
CONTROL
STATE
TIME
IN
CURRENT
STATE
TIME
IN
STATE
CURRENT
CONTROL
STATE
SUCTION
SUCTION SAT.SUCT.
SAT.SUCT.
SUCTION
SUCT.SHEAT.
SUCT.SHEAT.
TIME
IN CURRENT
STATE
TIME
IN SUCTION
CURRENT
STATE
PRESSURE
PRESSURE
TEMP
TEMP
TEMP
TEMP SUCT.SHEAT.
TEMP
TEMP
SUCTION
SAT.SUCT.
SUCTION
SUCT.SHEAT.
SUCTION
SAT.SUCT.
SUCTION
SUCT.SHEAT.
SUCTION SAT.SUCT.
SAT.SUCT.
SUCTION
SUCT.SHEAT.
SUCTION
SUCTION
Page
Page
Up
Up
Page
Page
Down
Down
PRESSURE
TEMP
TEMP
TEMP
PRESSURE
TEMP
TEMP
TEMP
SUCTION
SAT.SUCT.
SUCTION
SUCT.SHEAT.
PRESSURE
TEMP
TEMP
TEMP
PRESSURE
TEMP
TEMP
TEMP
SUCTION
SAT.SUCT.
SUCTION
SUCT.SHEAT.
Page
Up
Page
Down
Page
Up
Page
Down
PRESSURE
TEMP
TEMP
TEMP
Page
Up
Page
Down
PageTEMP
Up
Page Down
PRESSURE
TEMP
TEMP
Page
Up Up
Page
Down
Page
Page
Down
HH:MM
HH:MM
HH:MM
HH:MM
HH:MM
HH:MM
Outputs
Outputs
Selecting
Selecting
the 'Outputs'
the 'Outputs'
menu
menu
option
option
shows
shows
the first
the first
4 Relay
4 Relay
Outputs:
Outputs:
OUTPUTS
Outputs
Outputs
Selecting
the
'Outputs'
menu
option
shows
the
first
4
Relay
Outputs:
Selecting
the
'Outputs'
menu
option
shows
the
first
4
Relay
Outputs:
Outputs
Selecting
thethe
'Outputs'
menu
option
showsshows
the firstthe
4 Relay
Selecting
Outputs
Menu
option
firstOutputs:
4 Relay
Outputs:
Selecting
theACTUAL
'Outputs'
menumenu
option
shows
the first
Relay
Outputs:
ACTUAL
DISPLAY
DESCRIPTION
DESCRIPTION
Selecting
the DISPLAY
'Outputs'
option
shows
the 4first
4 Relay
Outputs:
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
09:56
09:56
Outputs
Outputs
HH:MM
HH:MM
Screen
Screen
Title
Title
Relays
RelaysOutputs
Status
Status
09:56
Outputs
09:56
Outputs
09:56
Outputs
09:56
M-1
M-1
COMP
COMP
Lck
Lck
Off
Off
Relays
Status
Relays
Status
09:56
Outputs
Relays
Status
Relays
Status
09:56
Outputs
M-2
M-2
LOAD
LOAD
Lck
Lck
Off
Off
M-1
COMP
Lck
Off
M-1
COMP
Relays
Status
M-1
COMP
Lck
Off
M-1
COMP
Lck
Off
Relays
Status
M-3
M-3
UNLOAD
UNLOAD
Lck
Lck
Off
M-2
LOAD
Lck
Off
M-2
LOAD
M-1
COMP
Lck
Off
Off
M-2 M-2
LOADLOAD
Lck Lck
OffOff
M-1
COMP
Lck
Off
M-4
LLS
LLS
1 1
Lck
Off
M-3
UNLOAD
Lck
Off
M-3
UNLOAD
M-2M-4
LOAD
LckLck
OffOff
M-3
UNLOAD
Lck
Off
M-3
UNLOAD
Lck
Off
M-2
LOAD
Lck
Off
Anlog
PG
M-4
LLS
M-4
LLS
Lck
Off
M-3Anlog
UNLOAD
LckLck
OffOff
M-4
LLS
1 PG PG
Lck
Off
M-4
LLS
11 1
Lck
Off
M-3
UNLOAD
Lck
OffPG
M-4Anlog
LLS LLS
1 1 PG
Lck Lck
OffPG
Anlog
PG PG
PG
Anlog
PG
PG
M-4
OffPG
Anlog
Anlog
PG PG
PG PG
Anlog
Left/Right
Left/Right
Arrow
Arrow
ROHH:MM
RO
position
position
& names
& names
Current
Current
status
of
of
RO ROArrow
Screen
Title
Left/Right
Arrow
HH:MM
Screen
Title
Left/Right
Arrow
HH:MM
Screen
Titlestatus
Left/Right
Arrow
HH:MM
Screen
Title
Left/Right
RO
position
&
names
Current
status
of
RO
RO
position
&
names
Current
status
of
RO
HH:MM
Screen
Title
Left/Right
Arrow
RO
position
&
names
Current
status
of
RO
RO HH:MM
position & names
Current
RO
Screen
Titlestatus of
Left/Right
Arrow
Using
the the
LeftLeft
and
Right
Right
arrow
arrow
buttons
buttons
allows
allows
user
to view
to view
all all
ROUsing
position
&and
names
Current
status
ofuser
RO
RO position
& namesStatus,
Current
status
ofRun
RORun
Status,
LastLast
On, On,
LastLast
Off,Off,
TimeTime
Using
Right
arrow
buttons
allows
to
Using
the the
LeftLeft
and and
Right
arrow
buttons
allows
useruser
to view
view
all all
Using
the
Left
and
Right
arrow
buttons
allows
user
to view
view
all
Using
the
Left
and
Right
arrow
buttons
allows
user
to
all
Today,
Today,
Cycles
Today,
Today,
Runarrow
Run
Time
Time
Yesterday,
Yesterday,
Cycles
Cycles
Yesterday,
Yesterday,
Status,
Last
On,
Last
Off,
Time
Status,
Last
On,
Last
Off,
Run
Time
Using
theCycles
Left
and
Right
buttons
allows
user
to
view
all
Status,
Last
On,
Last
Off,
Run
Time
Status,
Last
On,
Last
Off,
Run
Time
Using
the
Left
and
Right
arrow
buttons
allows
user
toRun
view
all
Total
Total
RunRun
Run
Hours,
Hours,
and
and
Total
Total
Cycles)
Cycles)
Today,
Cycles
Today,
Run
Time
Yesterday,
Cycles
Yesterday,
Today,
Cycles
Today,
Run
Time
Yesterday,
Cycles
Yesterday,
Status,
Last
On,
Last
Off,
Run
TimeTime
Today,
Cycles
Today,
Run
Time
Yesterday,
Cycles
Yesterday,
Today,
Cycles
Today,
Time
Yesterday,
Cycles
Yesterday,
Status,
Last
On,
Last
Off,
Run
Total
Run
Hours,
and
Total
Cycles)
Total
Run Run
Hours,
and
Total
Cycles)
Today,
Cycles
Today,
Time
Yesterday,
Cycles
Yesterday,
Total
Run
Hours,
and
Total
Cycles)
Total
Run
Hours,
and
Total
Cycles)
Today,
Cycles
Today,
Run
Time
Yesterday,
Cycles
Yesterday,
Total
Run Run
Hours,
and and
Total
Cycles)
Total
Hours,
Total
Cycles)
Pressing
Pressing
the Page
the Page
Down
Down
button
button
shows
shows
the next
the next
4 Relay
4 Relay
Outputs:
Outputs:
Pressing
the
Page
Down
button
shows
the
next
4
Relay
Outputs:
Pressing
the
Page
Down
button
shows
the
next
4
Relay
Outputs:
Pressing
the the
PagePage
DownDown
buttonbutton
shows shows
the next the
4 Relay
Outputs:
Pressing
next
4 Relay Outputs:
Pressing
the
Page
Down
button
shows
the
next
4
Relay
Outputs:
ACTUAL
ACTUAL
DISPLAY
DISPLAY
DESCRIPTION
Pressing the Page Down button shows the next 4 Relay Outputs: DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
09:56
09:56 Outputs
Outputs
HH:MM
HH:MM
Screen
Screen
Title
Title
Relays
RelaysOutputs
Status
Status
09:56
Outputs
09:56
Outputs
09:56
Outputs
09:56
M-5
M-5
LIQ
LIQ
INJ
INJ
On
On
Relays
Status
Relays
Status
09:56
Outputs
Relays
Status
Relays
Status
09:56
Outputs
M-6
M-6
HOT
HOT
GAS
OnStatus
On
M-5
LIQ
INJ
On
M-5
LIQ
INJGAS
Relays
Status
M-5
LIQ
INJ
On
M-5
LIQ
INJ
On
Relays
M-7
LLS
2
On
M-6
HOT
On
M-6
HOT
GAS
M-5M-7
LIQLLS
INJ2GAS
On On
M-6
HOT
GAS
On
M-6
HOT
GAS
On
M-5
LIQ
INJ
On
M-8
SUBCOOLER
On
M-7
LLS
On
M-7
LLS
M-6M-8
HOTSUBCOOLER
On On
M-7
LLS
2GAS
On
M-7
LLS
22GAS2
On
M-6
HOT
On
M-8
Anlog
PG PG
M-8
SUBCOOLER
On
M-7Anlog
LLSSUBCOOLER
2 2 PG PG On
On On
M-8
SUBCOOLER
On
M-8
SUBCOOLER
M-7
LLS
On
M-8Anlog
SUBCOOLER
Anlog
PG PG
PG PG
Anlog
PG On On
PG
M-8
SUBCOOLER
Anlog
PG
PG
Anlog
PG PG
PG PG
Anlog
Left/Right
Left/Right
Arrow
Arrow
ROHH:MM
RO
position
position
& names
& names
Current
Current
status
of
of
RO ROArrow
Screen
Title
Left/Right
Arrow
HH:MM
Screen
Title
Left/Right
Arrow
HH:MM
Screen
Titlestatus
Left/Right
Arrow
HH:MM
Screen
Title
Left/Right
RO
position
&
names
Current
status
of
RO
RO
position
&
names
Current
status
of
RO
HH:MM
Screen
Title
Left/Right
Arrow
RO position
& names Screen
Current
status
of RO
RO HH:MM
position
& names
Current
of
RO
Titlestatus
Left/Right
Arrow
Using
the the
LeftLeft
and
Right
Right
arrow
arrow
buttons
buttons
allows
allows
user
to view
to view
all all
ROUsing
position
&and
names
Current
status
ofuser
RO
RO position
& namesStatus,
Current
status
ofRun
RORun
Status,
LastLast
On, On,
LastLast
Off,Off,
TimeTime
Using
Right
arrow
buttons
allows
to
Using
the the
LeftLeft
and and
Right
arrow
buttons
allows
useruser
to view
view
all all
Using
the
Left
and
Right
arrow
buttons
allows
user
to view
view
all
Using
the
Left
and
Right
arrow
buttons
allows
user
to
all
Today,
Today,
Cycles
Today,
Today,
Runarrow
Run
Time
Time
Yesterday,
Yesterday,
Cycles
Cycles
Yesterday,
Yesterday,
Status,
Last
On,
Last
Off,
Time
Status,
Last
On,
Last
Off,
Run
Time
Using
theCycles
Left
and
Right
buttons
allows
user
to
view
all
Status,
Last
On,
Last
Off,
Run
Time
Status,
Last
On,
Last
Off,
Run
Time
Using
the
Left
and
Right
arrow
buttons
allows
user
toRun
view
all
Total
Total
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DESCRIPTION
DESCRIPTION
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DESCRIPTION
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Continue
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14:48
Graphs
SUCT
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HH:MM
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14:48 Graphs
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14:48
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14:22:13
14:36:15
14:48:46
14:22:13
14:36:15
14:48:46
70
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14:22:1314:36:15
14:36:1514:48:46
14:48:46
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14:22:13
14:36:15
14:48:46
14:22:13
14:36:15
14:48:46
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14:22:13
14:36:15
14:48:46
14:22:13
14:36:15
14:48:46
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HH:MM DESCRIPTION
Screen
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Setpoints
09:56
Setpoints
HH:MM
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09:56
Setpoints
ACTUAL
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Selecting
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Using
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1 GLYCOL
TRGT
-5.2F
HH:MM
HH:MM
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09:56
09:56
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31 CTRL
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09:56
Setpoints
HH:MMDESCRIPTION
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09:56
Setpoints
ACTUAL
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ACTUAL
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ACTUAL
DISPLAY
17
LOZONE+
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the
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09:56
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Using
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HH:MM
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09:56
Setpoints
17 LO
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17 LO17SUPERHEAT
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SETPOINTS
NameName
16
© 2015 Heatcraft Refrigeration Products, LLC
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
REVISION
2.4
REVISION
2.4
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
REVISION
REVISION
2.4 2.4
GETTING
STARTED
MANUAL
GETTING
STARTED
MANUAL
REVISION
2.4
REVISION
2.4
Pressing
the Page
DownDown
buttonbutton
showsshows
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Pressing
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the 4next
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ACTUAL
DISPLAY
ACTUAL
DISPLAY
DESCRIPTION
DESCRIPTION
Pressing
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Page
Down
button
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ACTUAL
DISPLAY
DESCRIPTION
Pressing
the Page
Down
the
4 setpoints:
09:56
Setpoints
HH:MM
Screen
TitleTitle
ACTUAL
DISPLAY
DESCRIPTION
Pressing
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Down
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showsshows
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09:56
Setpoints
HH:MM
Screen
ACTUAL
DISPLAY
DESCRIPTION
Left/Right
ArrowArrow
Left/Right
Name Name
ValueValue
23 ACTUAL
POWERUP
DLAY
Using
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arrow
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09:56
Setpoints
HH:MM
Screen
Title
Left/Right
DISPLAY
DESCRIPTION
DISPLAY
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23 ACTUAL
POWERUP
DLAY 15s 15s
Using
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09:56
Setpoints
HH:MM
Screen
Title
Left/Right
GETTING
STARTED
MANUAL
REVISION
2.4
GETTING
STARTED
MANUAL
REVISION
25
STEP
SENSIT
1 Value
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Name
26
DELAY
23
DLAY180s
15s
Using
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09:56
Setpoints
HH:MM
Screen
Title
Left/Right
Arrow
26 POWERUP
STEP
DELAY
09:56
Setpoints
HH:MM
Screen
Title
Left/Right
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23 STEP
POWERUP
DLAY
15s180s
Using
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allows
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27
MAX
ROC-0.7F
25
STEP
SENSIT
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27
MAX
ROC-0.7F
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25 the
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Pressing
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the next
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26
DELAY
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23 STEP
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26 POWERUP
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27
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27ACTUAL
MAX ROC-0.7F
DISPLAY
DESCRIPTION
DISPLAY
DESCRIPTION
Page
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Continue
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Page
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26 ACTUAL
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26 STEP
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Continue
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27
MAX
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Continue
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27 MAX ROC-0.7F
09:56
Setpoints
HH:MM
Screen
Left/Right
ArrowArrow
Service
ToolsTools
09:56
Setpoints
HH:MM to scroll through
Screen
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Left/Right
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Continue
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Service
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Selecting
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Selecting the 'Service Tools' menu option shows the following submenu:
23 POWERUP
DLAY the
15s 15s or Page
Using
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SERVICE
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Service
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23 POWERUP
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Continue
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Service
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Continue
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DESCRIPTION
ACTUAL
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ACTUAL
25
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25
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Selecting
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26 STEP
DELAYDELAY 180s 180s
Service
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26 STEP
Service
Tools
DESCRIPTION
ACTUAL
DISPLAY
09:56
Tools
Screen
TitleTitle
DESCRIPTION
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27 ACTUAL
MAX
ROC-0.7F-0.7F
27Serv
MAX
ROC09:56
Serv
Tools
HH:MM
Screen
Selecting
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menuHH:MM
option
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DESCRIPTION
Selecting
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ACTUAL
DISPLAY
-RS485
Network
1
Highlight
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Menu.
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Highlight choice press
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DESCRIPTION
ACTUAL
DISPLAY
1.RS485
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network
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address,
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baud
DESCRIPTION
ACTUAL
DISPLAY
09:56
Serv
Tools
HH:MM
Screen
Title
-Ethernet
Network
1.RS485 Network- View
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Network
09:56
Serv Tools
HH:MM
Screen
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2.Ethernet
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default
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3.System
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Date
-Ethernet
Network
09:56
Serv
Tools
HH:MM
Screen
Title
09:56
Serv
Tools
HH:MM
Screen
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Date
1.RS485
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date,
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Selecting
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MCS
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3.System
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network
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baud
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-Ethernet
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PG 'Service
PG option
hardware
serial
number,
physical
mac address,
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-Time
/ Date
version,
config
name,
company
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model
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ACTUAL
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5.
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Page
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4.Time
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Page
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date,
bootloader
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4.Time
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DateView
and
change
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or
date.
09:5609:56
Serv Serv
ToolsTools
HH:MM
Screen
Title
number,
install
date,
config
version,
config
date,
bootloader
HH:MM
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PG
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Highlight
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Page
ofboards.
I/O boards.
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/ Page
DateView
and change
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ordown
date.
up
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down
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and
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1.RS485
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-Ethernet
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5. Display
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contrast,
background
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ACTUAL
DISPLAY
DESCRIPTION
5.
Display
View
contrast,
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andaddress,
backlight.
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DESCRIPTION
Pressing
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dynaimic
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-System
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Info
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down
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the rest
options:
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Page
Page
up
Page
down down
default
gateway,
and
MCS
port.
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Firmware
default
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-Time
/
Date
-Time
/
Date
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downDISPLAY
arrow shows the rest ofversion,
the submenu
options:
ACTUAL
DESCRIPTION
config
name,
company
name,
model
name,
unit
serial
version,
config name,
company
name, model name, unit serial
09:56
Serv
Tools
Screen
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the
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shows
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submenu
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09:56
Serv
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the submenu
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number,
install
date, date,
config
version,
configconfig
date, date,
bootloader
number,
install
config
version,
bootloader
-Clr -Clr
AlarmAlarm
Hist
PGHist
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ACTUAL
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ACTUAL
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09:56
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09:56
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Highlight
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physical
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and
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address,
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DESCRIPTION
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the
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history.
7.Clr
DESCRIPTION
HH:MM
Screen
Title
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Point
DESCRIPTION
HH:MM
Screen
Title
of
I/O
boards.
4.Time
/
DateView
and
change
the
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or
date.
of
I/O
boards.
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/
DateView
and
change
the
time
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Info-Highlight
ClearClear
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point
information.
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press
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View
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choice
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access
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Menu.
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backlight.
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sensor
values
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voltages.
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for
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6.Clr
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the
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Page
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Page
down down
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Page
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sensors.
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configuration has been corrupted when an invalid config
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configuration
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Pressing
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shows
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of rest
the submenu
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the
down
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submenu
options:
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HistClear
the alarm
history.
7.Clr
Point
-Config
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-Clr
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PG
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more
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the
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checksums
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InfoClear
the
point
8.Sensor
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if
a
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the
-Sensor
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point information.
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arethe
displayed
allowing
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the
-Sensor
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ACTUAL
DISPLAY
DESCRIPTION
configuration
has
been
when
an
invalid
config
checksums
are
displayed
allowing
the
user
to compare
the
ACTUAL
DISPLAY
DESCRIPTION
View sensor
and corrupted
voltages.
Page
Up/Down
for
more
configuration
hasvalues
been
corrupted
when
an
invalid
config
View
sensor
and voltages.
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foris
more
-Config
Checksums
checksums.
Ifvalues
all
checksums
match,
thenUp/Down
the
file
not
-Config
Checksums
alarm
occurs.
Both
the
calculated
checksums
and
storage
PG PG
PG PG
checksums.
If
all
checksums
match,
then
the
file
not
sensors. 9.Config Checksums- view if a section ofisthe
alarm occurs.
Both
the has
calculated
checksums
and
sensors.
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Checksumsviewcorrupted
if
a section
ofstorage
the
corrupted.
If aare
section
been
the
checksums
checksums
displayed
allowing
the
user
to
compare
the
corrupted.
If
a section
has been
corrupted
the
checksums
configuration
hasScreen
been
corrupted
when
an compare
invalid
config
checksums
are has
displayed
allowing
the
user
to
the
09:5609:56
Serv Serv
Tools
HH:MM
Title
configuration
been
corrupted
when
an
invalid
config
Tools
HH:MM
Screen
Title
will
not
match.
PG
PG
checksums.
If all
checksums
match,
then
the
file
is not
will
not
match.
PG
PG
alarm
occurs.
Both
the calculated
checksums
and
storage
checksums.
If
all
checksums
match,
then
the
file
is
not
alarm
occurs.
Both
the
calculated
checksums
and
storage
-Clr
Alarm
Hist
Highlight
choice
and
press
enter
to
access
Sub
Menu.
Lockout
Reset Reset
-Clr Alarm Hist
Highlightare
choice
and
press
enter
to access
Sub
Menu.
Page
up
Page
downthe
corrupted.
adisplayed
section
been
corrupted
the
checksums
Lockout
Page
up
Page
down
checksums
allowing
the to
user
to
compare
corrupted.
If
aIfsection
has has
been
corrupted
the
checksums
checksums
are
displayed
allowing
user
compare
the
6.Clr
Alarm
HistClear Clear
the
alarm
history.
7.Clr
Point
-Clr -Clr
PointPoint
Info Info
6.Clr
Alarm
Histthe the
alarm
history.
7.Clr
Point
will
not
match.
Selecting
the
'Lckout
RST'
menu
option
shows
the
following:
checksums.
If
all
checksums
match,
then
the
file
is
not
will
not
match.
checksums.
If
all
checksums
match,
then
the
file
is
not
Selecting
the
'Lckout
RST'
menu
option
shows
the
following:
InfoClear
the
point
information.
8.Sensor
DiagnosticsInfo- ClearIfthe
point information.
Diagnostics-Sensor
Diagnostics
Lockout
Reset
-Sensor
Diagnostics
Page
up 8.Sensor
Page down
aand
section
has
been
the
checksums
Lockout
Reset
up
Page
corrupted.
If
a section
has
been
corrupted
checksums
View corrupted.
sensor
values
voltages.
Page corrupted
Up/Down
for
more
View sensor
values
andPage
voltages.
Page the
Up/Down
for down
more
ACTUAL
DISPLAY
DESCRIPTION
-Config
Checksums
-Config
Checksums
ACTUAL
DISPLAY
DESCRIPTION
will
not
match.
Selecting
the
'Lckout
RST'
menu
option
shows
the
following:
will
not
match.
sensors.
9.Config
Checksumsview if
a section
of theof the
9.Config
Checksumsview
if a section
Selecting the 'Lckout RST' menu option shows
the sensors.
following:
Lockout
Reset
Page
up
Page
Lockout Reset
Page
upwhen an invalid Page
configuration
has been
corrupted
configdown down
configuration
has
been
corrupted
ACTUAL
DISPLAY
DESCRIPTION
HH:MMHH:MM
Screen
TitleTitlewhen an invalid config
09:56ACTUAL
Main
Menu
PG Menu
PG
Screen
PG
PG
09:56
Main
DISPLAY
DESCRIPTION
alarm
occurs.
Both
the
calculated
checksums
and
storage
Selecting
the 'Lckout
RST' option
menu option
the following:
alarm
occurs. Both the calculated checksums and storage
Selecting
the 'Lckout
RST' menu
shows shows
the following:
-Status
-Status -Setpoints
-Setpoints
checksums
are displayed
allowing
the user
compare
the the
checksums
are displayed
allowing
the to
user
to compare
HH:MM
Screen
-Outputs
-Serv
ToolsTools
Pop-up
willIf
prompt
user
to
perform
lockout
reset.
ACTUAL
DISPLAY
DESCRIPTION
09:56
Main
ACTUAL
DISPLAY
DESCRIPTION
checksums.
all
checksums
match,
then
the
file
notis not
-Outputs
-Serv
Pop-up
will
prompt
user
to Title
perform
lockout
reset.
HH:MM
Title
checksums.
If
allScreen
checksums
match,
then
the is
file
09:56
Main
MenuMenu
Lockout
Yes Yes
Lockout
-Status
-Setpoints
-Inputs
RST RST
corrupted.
If a section
has been
the checksums
corrupted.
If a section
has corrupted
been corrupted
the checksums
-Inputs -Lckout
-Lckout
-Status
-Setpoints
LOCKOUT
RESET
-Alarms
-Lckout
ALM
will
not
match.
-Outputs
-Serv
Tools
Pop-up
will
prompt
user
to
perform
lockout
reset.
Reset?
No
HH:MM
Screen
Title
09:56
Main
Menu
will
not
match.
HH:MM
Screen
Title
-Alarms
-Lckout
09:56
Main
Menu
Reset?
No ALM
-Outputs
-Serv
Tools
Pop-up will prompt user to perform lockout reset.
Lockout
Yes
Lockout -Passwords
Yes
Lockout
Reset
Page Page
up
Page Page
down down
-Graphs
-Inputs
-Lckout
RST shows the following:
-Status
-Setpoints
Lockout
Reset
up
-Status
-Setpoints
Selecting
the Lockout
RST
Menu
option
-Graphs
-Passwords
-Inputs
-Lckout
RST
-Alarms
-Lckout
ALM
Help
Reset?
No
-Outputs
-Serv
Tools
Pop-up
will
prompt
user
to
perform
lockout
reset.
Selecting
the 'Lckout
RST'
menu
shows
the following:
-Outputs
-Serv
Tools
Pop-up
will
prompt user to perform lockout reset.
Help
-Alarms
-Lckout
ALM
Reset?
No
Selecting
the 'Lckout
RST' option
menu option
shows
the following:
Lockout
Yes
Lockout
Yes
-Graphs
-Passwords
-Inputs -Lckout
-Lckout
-Inputs
RST RST
-Graphs
-Passwords
DESCRIPTION
ACTUAL
DISPLAY
DESCRIPTION
ACTUAL
DISPLAY
ACTUAL
DISPLAY
DESCRIPTION
Help
-Alarms
-Lckout
Reset?
No ALM
-Alarms
-Lckout
ALM
Reset?
No
Help
-Graphs
-Passwords
-Graphs
-Passwords
HH:MMHH:MM
Screen
TitleTitle
09:5609:56
Main Main
Menu Menu
Screen
Help Help
-Status
-Status -Setpoints
-Setpoints
-Outputs
ToolsTools
Pop-up
will will
prompt
user user
to perform
lockout
reset.
-Outputs -ServYes
-Serv
Pop-up
prompt
to perform
lockout
reset.
Lockout
Lockout
Yes
-Inputs
RST
-Inputs -Lckout
-Lckout
RST
-Alarms
-Lckout
ALM
Reset?
No
-Alarms
-Lckout
Reset?
No ALM
-Graphs
-Graphs -Passwords
-Passwords
Help Help
© 2015 Heatcraft Refrigeration Products, LLC
17
Table 10. System Troubleshooting Chart
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
Compressor will not
run
1. Main switch open.
2. Fuse blown.
3. Thermal overloads tripped.
4. Defective contactor or coil.
5. System shut down by safety devices.
6. No cooling required.
7. Liquid line solenoid will not open.
8. Motor electrical trouble.
9. Loose wiring.
10. Phase loss monitor inoperative.
1. Close switch.
2. Check electrical circuits and motor winding for shorts or grounds. Investigate for
possible overloading. Replace fuse after fault is corrected.
3. Overloads are automatically reset. Check unit closely when unit comes back
on line.
4. Repair or replace.
5. Determine type and cause of shutdown and correct it before resetting safety
switch.
6. None. Wait until calls for cooling.
7. Repair or replace coil.
8. Check motor for open windings, short circuit or burn out.
9. Check all wire junctions. Tighten all terminal screws.
10. Refer to page 17.
Compressor noisy or
vibrating
1. Flooding of refrigerant into crankcase.
2. Improper piping support on suction or liquid line.
3. Worn compressor.
1. Check setting of expansion valves.
2. Relocate, add or remove hangers.
3. Replace.
High discharge
pressure
1.
2.
3.
4.
5.
6.
Non-condensables in system.
System overcharges with refrigerant.
Discharge shutoff valve partially closed.
Fan not running.
Head pressure control setting.
Dirty condenser coil.
1.
2.
3.
4.
5.
6.
Remove the non-condensables.
Remove excess.
Open valve.
Check electrical circuit.
Adjust.
Clean.
Low discharge
pressure
1.
2.
3.
4.
5.
Faulty condenser temperature regulation.
Suction shutoff valve partially closed.
Insufficient refrigerant in system.
Low suction pressure.
Variable head pressure valve.
1.
2.
3.
4.
5.
Check condenser control operation.
Open valve.
Check for leaks. Repair and add charge.
See corrective steps for low suction pressure.
Check valve setting.
High suction pressure
1. Excessive load.
2. Expansion valve overfeeding.
1. Reduce load or add additional equipment.
2. Check remote bulb. Regulate superheat.
Low suction pressure
1.
2.
3.
4.
5.
6.
7.
Lack of refrigerant.
Evaporator dirty or iced.
Clogged liquid line filter drier.
Clogged suction line or compressor suction gas strainers.
Expansion valve malfunctioning.
Condensing temperature too low.
Improper TXV.
1.
2.
3.
4.
5.
6.
7.
Compressor loses oil
1.
2.
3.
4.
Lack of refrigerant.
Excessive compression ring blow by.
Refrigerant flood back.
Improper piping or traps.
1. Check for leaks and repair. Add refrigerant.
2. Maintain proper superheat at compressor.
3. Correct piping.
Compressor thermal
protector switch open
1. Operating beyond design conditions.
2. Dirty condenser coil.
3. Overcharged system.
18
Check for leaks. Repair and add charge.
Clean.
Replace cartridge(s).
Clean strainers.
Check and reset for proper superheat.
Check means for regulating condensing temperature.
Check for proper sizing.
1. Add components to bring conditions within acceptable limits (i.e., CPR/EPR
valves, additional condenser surface, liquid injection, etc.).
2. Open valve.
3. Clean coil.
4. Reduce charge.
© 2015 Heatcraft Refrigeration Products, LLC
Troubleshooting Quick Reference Sheet
PROBLEM
A sensor input reads -99.9
POTENTIAL SOLUTION
This indicates an open sensor input signal or 5 VDC problem.
• Check sensor wiring for missing wire or poor connection.
• Check sensor for bad sensor.
If less than 5 VDC is on the sensor 5 VDC terminal block, the problem is with probably a
shorted sensor. (A poly fuse protects the board)
• Remove all sensor input terminals.
• Wait about 1 min. or until 5 VDC restored at sensor input.
• Connect terminals one at a time until short reappears.
A sensor input reads +999.9
This indicates a shorted sensor input signal.
• Check sensor wiring for +5VDC shorted to signal etc.
• Check sensor for bad sensor.
A sensor is reading less then or
greater than 3% off
This indicates the sensor needs to be calibrated. (You need to have a valid Authorization
code to change sensor offsets)
• Press Service Diagnostics, press until LCD display s sensor offset option Press
• enter, 1st SI# and offset appears (i.e. Suction 1 = 0.0)
• Scroll using 'increase' (+)/decrease (-)' keys to find sensor to calibrated
• Press enter, use the 'increase' (+)/decrease (-)' keys to change calibration value.
• When value is correct press enter.
LCD blank or flashing.
Indicates bad connection.
• Check wiring to keypad
• Could indicate bad software transfer, retransmitting may be necessary.
Lost I/O
Indicates communications problem.
• Verify RS485 LED blinking.
• Verify termination jumper only on JP4 on the MCS-Magnum and the last I/O board.
• Verify MCS-Magnum and each I/O address is set correctly.
• Verify wiring from the MCS-Magnum to each I/O is correct.
• Check fuses/120 VAC on I/O units
Invalid reading on one sensor input
This indicates an input problem with 1 sensor.
• Verify jumper settings correct for that SI.
Invalid authorization
This indicates an invalid authorization number. Follow
steps below for proper authorization
• Press SERVICE DIAGNOSTICS until the auth. option appears Press the
• ENTER key
• From the 'Display Status' menu press keys corresponding to your authorization
• Press ENTER
© 2015 Heatcraft Refrigeration Products, LLC
19
Magnum Alarms and Safeties
There are three types of alarms that are generated by the Magnum control logic:
• Information only alarms
• Magnum system alarms
• Chiller setpoint safety alarms
All alarms have the same format. The alarm is identified and is date/time stamped. Alarms can be viewed from the Magnum keypad by selecting the ‘Alarms’ from the main menu,
or through MCS-Connect.
Information Only Alarms
System Generated Alarms
The following alarms are generated to provide information; they will not cause a change in the control algorithm such as a lock out condition or a Relay Output being forced off.
• POWER FAILED - Generated when power to the Magnum was lost.
• POWER RETURNED - Generated when power to the Magnum returned.
• HW DATE INVALID -The date contained/read from the hardware real time clock chip is not valid. Check battery voltage, it should be > 2.0 vdc.
• HW TIME INVALID - The time contained/read from the hardware real time clock chip is not valid. Check battery voltage, it should be > 2.0 vdc.
• SW DATE INVALID - The date contained/read from the software clock is not valid.
• SW TIME INVALID - The time contained/read from the software clock is not valid.
• RAM INTEGRITY - The data contained in the battery-backed up RAM memory may be corrupted. This does not stop the Magnum from running. It means the historical data
may be incorrect (run times, cycles, min/max values, and trend/graph data).
• WATCHDOG RESET - The Magnum has reset itself because of improper operator of the Magnum board. Please consult the manufacturer if this alarm has occurred.
• LOST A/D CONVTR - The Magnum microprocessor has lost communications to the Analog to Digital converter chip (chip that converts sensor voltages to a digital number).
Check for a shorted sensor that may cause
• LOST DISPLAY - Generated when communication to the Keypad/Display is lost.
• CF INIT ERROR - The Compact Flash card that was installed cannot be initialized and therefore cannot be used. Replace the Compact Flash card with one that works.
• BATTERY FAILED- Generated when Magnum is not getting power from the Battery.
User Initiated Alarms
The following alarms indicate that an individual took action: (Most require proper authorization)
• LOCKOUT RESET - Generated when a user resets a compressor other unit from a locked condition.
• COMPUTER RESET - Generated when the manual reset button on the Magnum is pressed.
• ALARMS CLEARED –Generated when a user clears the alarm history.
• STPT CHANGED - Generated when a user makes a change to a setpoint; the number of the setpoint will also be displayed with the alarm.
• RO TO (Selected Condition) - Generated when a user manually changes the condition of a Relay Output (either AUTO, MANON, or MANOFF).
• AO TO (Selected Condition) - Generated when a user changes the condition of an Analog Output (either AUTO or MANUAL. If MANUAL, then a dialog box
will appear to input the number value).
• SI TO (Selected Condition) - Generated when a user changes the condition of a Sensor Input (If a digital input, then either AUTO, MANON, or MANOFF. If an analog input,
then either AUTO or MANUAL. If MANUAL, then a dialog box will appear to input the number value).
• POINT INFO CLEAR - Generated when a user clears all point information (run times, cycles, min/max values, etc.).
• CLOCK SET - Generated when a user makes a change to the Magnum real time clock.
• CFG DOWNLOADED-Generated when a user uploads a new configuration file into the Magnum. ETHERNET
• RS485 CHANGED - Generated when a user makes changes to the RS485 address through the Keypad/Display.
• CF CARD INSERTED - Generated when a user inserts a Compact Flash memory card into the Magnum
• CF CARD REMOVED - Generated when a user removes a Compact Flash memory card from the Magnum.
Automatic Alarms
The following alarms indicate an action that the Magnum made automatically:
• ROTATED LEAD- Generated when the Magnum automatically rotates the Lead Compressor.
• DAYLIGHT SAVINGS – Generated when the Magnum automatically changes the real time clock to adjust for Daylight Savings Time.
20
© 2015 Heatcraft Refrigeration Products, LLC
Magnum System Alarms
Configuration Alarms
These alarms indicate a problem with the configuration file in the system. The system is not operational and a new configuration must be transmitted to the unit
through MCS-Connect.
• INVALID CONFIG - Checksums are incorrect.
• INVALID CFG VER - The version number of the configuration is invalid.
• INVALID CFG TYPE – The configuration type does not match the software type.
MCS Local Network Alarms
These alarms indicate problems with the MCS local network:
• LOST SI COMM #_ / LOST RO COMM #_ - Generated when communications to a Sensor Input or Relay Output board
is lost. The number of the board will be displayed with the alarm. The system can be accessed but will be in a NO RUN- I/O LOST state.
• MCS-STAT OFFLINE - The Magnum has lost communications to the MCS-STAT.
• LOST IO SHUTDOWN - Generated when Magnum is running and there are no communications to one or more of the
I/O boards. The system can be accessed but will be in a NO RUN- I/O LOST state.
• LOST I/O RESTART - Generated when the Magnum does an automatic reset once I/O communications are restored.
Key Sensors Alarms
These alarms indicate a problem with a key sensor, it is either shorted or open. The alarm will contain ALARM followed by the
10-character name of the sensor. The following sensors related to the entire system are tested:
• Leaving temperature: If failed, then Lock Out the system.
• Returning temperature: If failed, then alarm only no Lock Out.
• Ambient temperature: If failed, then alarm only no Lock Out.
The following compressor sensors are tested. If they fail, then that compressor only is locked out:
• Suction pressure and temperature
• Discharge pressure and temperature
• Oil pressure and temperature
• Motor temperature (if an analog input)
Emergency Stop Alarm
• EMERGENCY STOP - Generated when the emergency stop switch has been turned on. The system can be accessed but is in a Lock Out state.
Setpoint Safety Alarms
The Magnum algorithm incorporates a number of safety checks, based on setpoints, preventing unsafe conditions that could
potentially cause damage to the system. When a safety trips, the circuit will be in a SAFETY TRIPPED state. The circuit will remain
in this state for the time in the ‘Safety Down Time (min)’ cell and then move to the CMP ANTICYCLE or CMP IS OFF state where
the compressor will be allowed to run again if required. If the same safety trip occurs again within the time in the‘Lockout Delay Hrs’ cell since the first trip, the
circuit will be set to CMP LOCKED OUT state, which requires a manual reset to restart the compressor. If the lockout delay time is set to zero, the Magnum will
generate a lockout condition the first time that the safety occurs.
Sensor Inputs Used With Magnum
• Suction Pressure (Analog) Discharge
• Pressure (Analog) Discharge
• Temperature (Analog) Motor
• Temperature (Digital) Motor Amps
• (Analog)
• Motor Fault (Digital)
• Suction Temp (Analog Only) Oil Sump
• Level (Digital Only)
Setpoint Safeties
For a safety trip to occur, both the Sensor Input and the associated setpoint must be active. If a safety trips, the alarm name will
consist of the setpoint name plus additional identification such as point number, compressor number, or 30 second history leading
up to the trip if applicable.
NOTE: Most safeties are checked only if the compressor is running, however if the safety is always checked it will be noted.
The following is a list of safeties that are incorporated in the standard algorithm control. These safeties are checked every second. For a system with multiple
circuits, each one is tested individually. If a safety trip occurs, only that respective compressor will be affected, the others will continue to function normally.
Phase Loss Protection
Phase loss, as indicated by the phase loss monitor, will result in the entire system being Locked Off and a phase loss alarm will be generated. If setpoint #166
is inactive, the Magnum will wait for 2 seconds before the Lock Out occurs. The alarm will be PHASE LOSS and no restart will be attempted. If setpoint #166 is
active, the name of the setpoint will be in the message. Refer to section 13 setpoint #166.
© 2015 Heatcraft Refrigeration Products, LLC
21
Low Suction Pressure
If the suction pressure drops below the value of the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field, the compressor will be locked out and a
LOW SUCTION alarm generated. This safety is bypassed when the compressor is in a Pump Down state. This safety can also be used as a freeze protection based upon the
suction pressure. When this safety trip occurs, all compressors in the same suction group will react in the same manner. Refer to section 13 setpoint #77.
Unsafe Suction Pressure
This safety is similar to the low suction pressure safety, except it is often set up with a lower value and a shorter safety time. If the suction pressure drops below the value of
the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field of that setpoint, then the circuit will be Locked Out and a UNSAFE SUCTION alarm will be
generated. This safety will always cause a Lock Out on the first trip, requiring a manual reset. This safety is bypassed when the compressor is in a Pump Down state. When this
safety trip occurs, all compressors in the same suction group will react the same. Refer to section 13 setpoint #80.
High Discharge Pressure (SAFETY IS ALWAYS CHECKED)
If the discharge pressure rises above the value of the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field of that setpoint, then the circuit will be
locked out and a HIGH DISCHARGE alarm will be generated. Refer to section 13 setpoint #81.
Low Discharge Pressure
If the discharge pressure drops below the value of the setpoint for the time specified in the ‘Time (sec)’ field, the compressor will be Locked Out and a LOW DISCHARGE alarm will
be generated. Refer to section 13 setpoint #85.
High Discharge Temperature (SAFETY IS ALWAYS CHECKED)
If the discharge temperature analog input rises above the value of the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field, the compressor will be
Locked Out and a HIGH TEMPERATURE alarm will be generated. Refer to section 13 setpoint #87.
High Motor Temperature or Motor Fault (SAFETY IS ALWAYS CHECKED)
If the high motor temperature input rises above the value of the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field, the circuit will be Locked Out
and a HIGH MOTOR TEMPERATURE or MOTOR FAULT alarm will be generated. Refer to section 13 setpoint #95.
High Oil Temperature
If the oil temperature rises above the value of the setpoint or the digital input turns ON for the time specified in the ‘Time (sec)’ field, the compressor will be locked out and a HIGH
OIL TEMPERATURE alarm generated. Refer to section 13 setpoint #94.
High Motor Amperage
If the amperage analog input rises above the value of the compressor’s respective FLA setpoint #1711–90 times the value of setpoint#75 or the digital input turns ON for the time
specified in the ‘Time (sec)’ field, then the circuit will be Locked Out and a HIGH MOTOR AMP alarm will be generated. Refer to section 13 setpoint #75.
Low Motor Amperage
If the amperage analog input drops below the value of the compressor’s respective FLA setpoint #171 – 190 times the value of setpoint #76 or the digital input turns ON for the
time specified in the ‘Time (sec)’ field, then the circuit will be Locked Out and a LOW MOTOR AMP alarm will be generated. Refer to section 13 setpoint #76.
Low Discharge Superheat
If the discharge superheat is below the value in setpoint for the time specified in the ‘Time (sec)’ field, then the circuit will be Locked Out and a LOW DISCHARGE SUPERHEAT alarm
will be generated. Refer to section 13 setpoint #84.
Temperature>100 or < -20
40034 Suction Temperature>100 or < -30
40036 Discharge Temperature>110 or < -30
40046 Leaving Water Temperature>100 or < -20
40031 Suction Pressure>1200 or < -30
40033 Discharge Pressure>3500 or < -30
22
© 2015 Heatcraft Refrigeration Products, LLC
Preventive Maintenance
Unit Coolers
At every six month interval, or sooner if local conditions cause clogging or fouling of
air passages through the finned surface, the following items should be checked.
1. Visually inspect unit
•Look for signs of corrosion on fins, cabinet, copper tubing and
solder joints.
• Look for excessive or unusual vibration for fan blades or sheet metal panels
when in operation. Identify fan cell(s) causing vibration and check motor and
blade carefully.
• Look for oil stains on headers, return bends, and coil fins. Check any suspect
areas with an electronic leak detector.
• Check drain pan to insure that drain is clear of debris, obstructions or ice buildup and is free draining.
2. Clean evaporator coil and blades
• Periodic cleaning can be accomplished by using a brush, pressurized water or
a commercially available evaporator coil cleaner or mild detergent. Never use
an acid based cleaner. Follow label directions for appropriate use. Be sure the
product you use is approved for use in your particular application.
• Flush and rinse coil until no residue remains.
• Pay close attention to drain pan, drain line and trap.
3. Check the operation of all fans and ensure airflow is unobstructed
• Check that each fan rotates freely and quietly. Replace any fan motor that does
not rotate smoothly or makes an unusual noise.
• Check all fan set screws and tighten if needed.
• Check all fan blades for signs of stress or wear. Replace any blades that are
worn, cracked or bent.
• Verify that all fan motors are securely fastened to the motor rail.
• Lubricate motors if applicable.
4. Inspect electrical wiring and components
• Visually inspect all wiring for wear, kinks, bare areas and discoloration. Replace
any wiring found to be damaged.
• Verify that all electrical and ground connections are secure, tighten if necessary.
• Check operation/calibration of all fan cycle and defrost controls when used.
• Look for abnormal accumulation of ice patterns and adjust defrost cycles
accordingly
• Compare actual defrost heater amp draw against unit data plate.
• Visually inspect heaters to ensure even surface contact with the coil. If heaters
have crept, decrease defrost termination temperature and be sure you have
even coil frost patterns. Re-align heaters as needed.
• Check drain line heat tape for proper operation (supplied and installed by
others).
5. Refrigeration Cycle
• Check unit cooler superheat and compare reading for your specific application
• Visually inspect coil for even distribution
Air-Cooled Condensing Units/Quarterly
1. Visually inspect unit
Air-Cooled Condensing Units/Semi-Annually
2. Repeat all quarterly inspection items.
3. Clean condenser coil and blades
• Periodic cleaning can be accomplished by using a brush, pressurized water and
a commercially available foam coil cleaner. If foam cleaner is used, it should not
be an acid based cleaner. Follow label directions for appropriate use.
• Rinse until no residue remains.
4. Check operation of condenser fans
• Check that each fan rotates freely and quietly. Replace any fan motor that does
not rotate smoothly or makes excessive noise.
• Check all fan blade set screws and tighten as required.
• Check all fan blades for signs of cracks, wear or stress. Pay close attention to
the hub and spider. Replace blades as required.
• Verify that all motors are mounted securely.
• Lubricate motors if applicable. Do not lubricate permanently sealed, ball bearing
motors.
5. Inspect electrical wiring and components
• Verify that all electrical and ground connections are secure, tighten as required.
• Check condition of compressor and heater contractors. Look for discoloration
and pitting. Replace as required.
• Clean electrical cabinet. Look for signs of moisture, dirt, debris, insects and
wildlife. Take corrective action as required.
• Verify operation of oil sump heater by measuring amp draw.
6. Check refrigeration cycle
• Check suction, discharge pressure readings. If abnormal take appropriate action.
• Check pressure drop across all filters and driers. Replace as required.
• Verify that superheat at the compressor conforms to specification. (30°F to 45°F)
• Check pressure and safety control settings and verify proper operation.
Air-Cooled Condensing Units/Annually
7. In addition to quarterly and semiannual maintenance checks,
submit an oil sample for analysis
• Look for high concentrations of acid or moisture. Change oil and driers until test
results read normal.
• Investigate source of high metal concentrations, which normally are due to
abnormal bearing wear. Look for liquid refrigerant in the crankcase, low oil
pressure or low superheat as a possible source.
8. Inspect suction accumulator (if equipped)
• If the accumulator is insulated remove insulation and inspect for leaks and
corrosion.
• Pay close attention to all copper to steel brazed connections
• Wire brush all corroded areas and peeling paint.
• Apply an anticorrosion primer and paint as required. Re-insulate if applicable.
• Look for signs of oil stains on interconnection piping and condenser coil. Pay
close attention to areas around solder joints, building penetrations and pipe
clamps. Check any suspect areas with an electronic leak detector. Repair any
leaks found and add refrigerant as needed.
• Check condition of moisture indicator/sightglass in the sight glass if so
equipped. Replace liquid line drier if there is indication of slight presence of
moisture. Replace refrigerant, oil and drier if moisture concentration is indicated
to be high.
• Check moisture indicator/sightglass for flash gas. If found check entire system
for refrigerant leaks and add refrigerant as needed after repairing any leaks.
• Check compressor sightglass (if equipped) for proper oil level.
• Check condition of condenser. Look for accumulation of dirt and debris (clean
as required).
• Check for unusual noise or vibration. Take corrective action as required.
• Inspect wiring for signs of wear or discoloration and repair if needed.
• Check and tighten all flare connections.
© 2015 Heatcraft Refrigeration Products, LLC
23
FUSE 8
POWER
BLOCK 1
CONTROL
TRANSFORMER
V
600
CIRCUIT
BREAKER
15A
460 V
L3
L1
WHITE
2
120 V
EMERG/STOP
SWITCH
BLACK
1
(OPTIONAL)
RECIEVER
HEATER 1
RECEIVER
THERMOSTAT 1
100
CRANKCASE
RELAY 1
CCR1
8
COMPRESSOR 1
CRANKCASE
HEATER
3
4
COMP 1
MODULE
120 V
L1
N
MAGNUM 1
FACTORY SUPPLIED
120VAC
FIELD MOUNTED
BLACK
SUPPLY AIR
SHIELD
TEMP 1
WHITE
GND
+5V
GRD
LINE
S1
WHITE
+5V
SHIELD/BLK
WHITE
WHITE
BLK
SHIELD
WHITE
SHIELD
WHITE
COMPRESSOR 1
MODULE
RED
11
14
WHITE
UNLOAD
SOLENOID 1
COM
NO
5
NC
GRD
(OPTIONAL)
S1
M4 / ANALOG
CT-300
LIQUID LINE
SOLENOID 1
COM
NO
6
NC
+5V
GRD
S1
FAN 1
CONTACTOR
COM
NO
FC1
56
NC
+5V
FAN 2
CONTACTOR
GRD
FC2
S1
M6 / ANALOG
T1-100
FAN 3
CONTACTOR
COM
RELAY 6
BLACK
SHIELD
4
NO
GRD
S1
M3 / ANALOG
TI-500
RELAY 5
DISCHARGE 1
TEMP
NO
FC3
57
NC
+5V
FAN 4
CONTACTOR
GRD
FC4
S1
M7 / DIGITAL
FAN 5
CONTACTOR
COM
RELAY 7
BLK
AMBIENT
TEMP
SHIELD
WHITE
WHITE
FC5
58
FAN 6
CONTACTOR
GRD
FC6
S1
M8 / ANALOG
T-100
COM
RELAY 8
SHIELD
NO
NC
+5V
PUMP DOWN
SWITCH 1
BLACK
7
NC
M5 / ANALOG
T1-100
BLK
CCR1
LOAD
SOLENOID 1
COM
+5V
RELAY 4
SUCTION
TEMP 1
CRANKCASE
RELAY 1
2
+5V
SHIELD
C1A
52
S1
RELAY 3
COMPRESSOR 1
AMPS
NO
NC
RELAY 2
DISCHARGE 1
TRANSDUCER
C1B
COMPRESSOR
CONTACTOR 1A
GRD
M2 / ANALOG
T1-500
RED
COMPRESSOR
CONTACTOR 1B
3
COM
RELAY 1
RED
SHIELD/BLK
1
52
M1 / ANALOG
T1-100
SUCTION 1
TRANSDUCER
CRANKCASE
RELAY 1
CCR1
NEUTRAL
NO
NC
+5V
GRD
S1
M9 / DIGITAL
COM
RELAY 9
BLACK
C
RUN/STOP
FIELD SUPPLIED
SHIELD
WHITE
NO
+5V
NO
NC
GRD
S1
M10 / DIGITAL
COM
RELAY 10
PHASE
MONITOR 1
BLACK
C
SHIELD
WHITE
NO
+5V
NO
NC
GRD
S1
M11 / DIGITAL
COMPRESSOR
OVERLOAD 1B
COMPRESSOR
OVERLOAD 1A
BLACK
96
95
96
95
SHIELD
WHITE
+5V
GRD
S1
M12 / DIGITAL
THIS DOCUMENT CONTAINS
MATERIAL AND/OR INFOR-
MATION WHICH IS THE PROP
CORPORATION WITHOUT PRIOR
WRITTEN APPROVAL.
DRAWN
REF NO.
REV.
PG.
TYPICAL MICRO CONTROLS
DATE
CHECKED
24
CONTROL POWER
A PROPRIETY BASIS. NO
TO ANY PERSON, FIRM, OR
DATE
TITLE
ERTY OF HEATCRAFT LLC.,
AND IS SUPPLIED ONLY ON
TRANSMITTAL SHALL BE MADE
DATE
1
OF
1
B
DWG. NO.
REV.
© 2015 Heatcraft Refrigeration Products, LLC
Notes:
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_______________________________________________________________________________________
_______________________________________________________________________________________
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_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
© 2015 Heatcraft Refrigeration Products, LLC
25
Replacement Parts by
Commercial Refrigeration Parts
InterLink™ Comercial Refrigeration Parts is your link to a complete line of dependable and certified
commercial refrigeration parts, accessories and innovative electronic controls for all Heatcraft Refrigeration
Products (HRP) brands - including Bohn, Larkin, Climate Control and Chandler. At InterLink, we provide
our wholesalers with a comprehensive selection of product solutions and innovative technologies for the
installed customer base. And every product is built to ensure the same high performance standards with
which all HRP brands are built — backed by a dedicated team to serve every customer need, delivering at
the best lead times in the industry.
Replacement parts should be obtained from your local InterLink wholesaler. Replacement parts, which
are covered under the terms of the warranty statement on page 2 of this manual, will be reimbursed
for total part cost only. The original invoice from the parts supplier must accompany all warranty claims
for replacement part reimbursement. Heatcraft Refrigeration Products reserves the right to adjust the
compensation amount paid on any parts submitted for warranty reimbursement when a parts supplier's
original invoice is not provided with a claim. For more information, call 800-686-7278 or visit www.
heatcraftrpd.com
Micro Control Parts
MAGNUM PANEL MOUNT LCD
28999018
16-SI BOARD
28999904
MODEM
28908501
EXP BOARD WITH 10 RO'S MCS-R10
28999903
SENSOR 300 AMP CURRENT
28988033
TEMP SENSOR 20FT
28908101
-25TO230 T.SEN W/40FT WIR
28908102
TRANSDUCER 0-500 PSI 20FT
28908009
Condenser Parts
Fan Motor, 1.5 HP
25316401
Fan Blade, 30” Diameter
22900401
Fan Guard, 30” Diameter
23105701
Replacement compressors
Call 1-800-GO BITZER
(24/7 Support)
For our complete Refrigeration Systems Installation and Operations Manual (H-IM-64L),
please visit www.heatcraftrpd.com
Since product improvement is a continuing effort, we reserve the right to make changes in specifications without notice.
The name behind the brands you trust.™
CLIMATE
CONTROL
H-IM-SCU-1015
Commercial Refrigeration Parts
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