Mammoth V-Cube Slim User Manual

V-Cube Slim™
Floor-by-Floor Cooling and Heat Pump System

Installation, Operation and Maintenance Manual

Sizes: 180 to 840
Model: E Series

©2011 Mammoth, Inc.

P/N 71144911

Table of Contents

Model Nomenclature ·················································································································· 3
Transportation and Storage ········································································································ 3
Installation ·································································································································· 4
Unit Location ······························································································································ 4
Disassembly and Assembly Instructions ···················································································· 5
Ductwork and Attenuation ·········································································································· 7
Ventilation Air ····························································································································· 7
Supply Piping ····························································································································· 8
Condensate Piping ····················································································································· 8
Cleaning and Flushing ················································································································ 9
Start-up ···································································································································· 10
Operating Limits ······················································································································· 11
Mammoth DDC Controls ·········································································································· 12
General Maintenance ··············································································································· 15
Troubleshooting ························································································································ 16
Check out sheet ······················································································································· 18

MAMM-VCS-IOM-1EB (October 2011)

2

Model Nomenclature

F -180- V- H- E

Voltage BTU/hr Cooling Unit Type Temperature Range Design Series

F = 208-230/60/3
G = 460/60/3
J = 380-415/50/3
K = 575/60/3

*Air handler configuration available. See MAMM-VCS-IOM-2EB for units that do not include packaged refrigeration components.

180 = 180,000*
240 = 240,000
280 = 280,000*
310 = 310,000

350 = 350,000*
460 = 460,000
530 = 530,000*
630 = 630,000
700 = 700,000*
830 = 830,000
840 = 840,000*

V = Vertical H = Standard Range
L = Low Temperature

Transportation and Storage

Upon receipt of the equipment, check for visible
damage. Make a notation on the shipper’s delivery
ticket before signing. If there is any evidence of rough
handling, immediately check for concealed damage. If
any damage is found, notify the carrier within 48 hours
to establish your claim and request their inspection and
a report. Then contact the Mammoth Service depart-

ment at [phone] or [e-mail]
for a warranty claim number.

MAMM-VCS-IOM-1EB (October 2011)

Do not stand or transport the unit on end. In the
event that elevator transfer makes up-ended position­ing unavoidable, absolutely ensure that the unit is in
the normal upright position for at least 24 hours before
operating.
Temporary storage at the job site must be indoors,
completely sheltered from rain, snow, etc. High or low
temperatures naturally associated with weather pat­terns will not harm units. Excessively high tempera­tures, 140°F (60°C) and higher, may deteriorate certain
plastic materials and cause permanent damage.

3

Installation

IMPORTANT:

Mammoth V-Cube Slim™ units should be installed only
by qualified personnel, experienced in the installation
of this equipment and related systems. Read these
instructions carefully before unpacking, installing and
operating this unit

1. To prevent damage, this equipment should not be
operated for supplementary heating and cooling
during the construction period.

2. Inspect the unit for any specific tagging numbers
indicated by the factory per a request from the in­stalling contractor.

3. Check the unit nameplate for the size and voltage
rating and confirm against the plans that the unit is
being installed in the correct location.

4. Verify the installation location with the piping, sheet
metal and electrical contractors prior to installation

General

5. Verify all clearances are available for the unit prior
to installation.

6. Note the location and routing of water piping, con­densate drain piping, and electrical wiring. The lo­cations of these items are clearly marked on sub­mittal drawings.

7. Mammoth recommends the unit be covered during
construction to protect components from dust and
other harmful material. This is critical while spray­ing fireproofing material on bar joists, sandblasting,
spray painting and plastering.

NOTE:

Check the unit name plate for correct voltage with the
plans before installing the equipment. Make sure all
electrical ground connections are made in accordance
with local code.

Unit Location

Locate the unit in an area that allows for easy removal
of the filter and access panels. Leave enough space for
service personnel to perform maintenance or repair.
Provide sufficient room to make water, electrical and

duct connections. Refer to submittal drawings for
proper service clearance dimensions. Install unit in
compliance with all state and local codes.

MAMM-VCS-IOM-1EB (October 2011)

4

Disassembly and Assembly Instructions For

V-Cube Slim™ Units

V-Cube Slim units are designed to allow for
installation in new facilities and as a retrofit for older,
obsolete equipment.

NOTE:

Please read all disassembly instructions completely
before starting any disassembly

DANGER!

A mechanical lift is required to move or lift all sections
of a V-Cube Slim™ unit. Do not attempt to move or lift
sections without a mechanical lift. Failure to do so can
result in equipment damage, severe personal injury or
death.

DANGER!

Lifting the entire unit (blower section, coil section, etc.)
using lifting lugs, eye bolts or straps attached to the top
of the unit can result in serious damage to the unit,
personal injury or death.

Lifting the entire unit should only be done using a fork­lift or a strapping spreader bar mechanism attached to
the base of the unit.

DANGER!

It is mandatory that all utilities (water, electric, and
communication cables to the Building Management
System) be removed prior to unit disassembly. Follow
approved lockout/tagout procedures before any disas­sembly of the unit. Failure to do so can result in elec­tric shock, equipment damage, severe personal injury,
or death.



The standard unit consists of three sections—the elec­trical control panel, the refrigeration/condensing section
and the blower section. Units with an optional water­side economizer or hot/chilled water coil will have an
additional section for that coil.

The disassembly of sections requires removal of the
3/8” bolts holding them together while supporting each
section as it is being removed with rigging equipment.

Step 1 – Remove the electrical panel

Unplug the wire harness that connects the EPiC™ key­pad and reset buttons/selector switches from the panel
door to the main electrical panel. Remove the panel
door by lifting it from its hinges and carefully set aside,
away from the unit to help prevent damage during the
remaining disassembly process.

Unplug all control wiring harnesses that run from the
main electrical panel to the compressor section. These
plugs are labeled for correct re-installation. Finally,
remove all high voltage wiring to the fan motors.

Once all electrical connections to other sections in the
unit have been removed, make sure that the electrical
panel is supported from above or below to prevent it
from falling once the bolts that connect it to the main
cabinet sections are loosened and removed.

Loosen and remove the section bolts that fasten the
main electrical panel to the main cabinet sections
(Figure 1). Set the main electrical panel aside, away
from the unit to help prevent damage during the re­maining disassembly process.

Figure 1—Electrical Control Panel Bolts



NOTE:

All blower wiring is correctly phased at the factory and
must be re-wired correctly upon re-assembly for cor­rect compressor and blower operation. Mark all wires
and pull through knockouts using care not to scrape
the insulation of the wiring when separating sections. If
the wire insulation or wire jacket is torn during the dis­assembly/re-assembly procedure, replace the wire. Do
not use wire that is missing insulation. Control and
sensor wiring use Molex plugs for proper polarity.

Your new V-Cube Slim will come fully assembled. In
the event building layout prohibits the unit to be moved
to its final location as a whole assembly, it will be nec­essary to disassemble the unit into its basic sections
and reassemble it at the final location.

MAMM-VCS-IOM-1EB (October 2011)

Remove the bolts used
to mount the electrical
cabinet to the main unit
sections. There are 6
bolts on the side of the
unit.

5

Step 2 – Remove optional coil section

This step only applies to units with a waterside econo­mizer or hot/chilled water coil.

Remove the bolts that connect the welded base of the
water coil section to the welded base of the main cabi­net section.

Remove the access panels on each side of the water
coil cabinet shown in Figure 2. Inside the water coil
section, disconnect wiring to any valves and/or air sen­sors that run to the other sections in the unit.

Once all electrical connections to the other sections in
the unit have been removed, loosen and remove the
section bolts that fasten the water coil cabinet to the
main cabinet section. Set the water coil section aside,
away from the unit to help prevent damage during the
remaining disassembly process.

Figure 2—Optional Coil Section Removal

Figure 3—Removal of Blower Section Bolts

Remove Section Bolts

Remove the water pipe extensions at the Victaulic con­nection point inside the unit. Attach lifting straps to the
motor mount plate as shown in Figure 4 and attach to a
spreader bar or forklift fork. Also attach ropes or chains
to the eye bolt on one of the motors and attach to each
end of the spreader bar or fork to level the load of the
blower section.

Remove Section Bolts

Step 3 – Removing the blower cabinet

Remove the main cabinet access panels (Figure 3).
Feed any wiring for the blower motors and/or air sen-

sors passing through the refrigeration/condensing sec­tion through the chase way into the blower cabinet.

Remove the section bolts that attach the blower cabinet
to the refrigeration/condensing section (Figure 3).

Figure 4—Lifting the Blower Section

CAUTION!

Lifting straps are to be used in lifting the blower section
only. Do not attach eye bolts to the motor mount plate
and attempt to lift the blower section. Failure to do so
can result in equipment damage and personal injury.

Use these instructions in the reverse order for assem­bly. Replace any torn or damaged gasket with new
material. Apply a bead of silicon caulking between sec­tions while reassembling to minimize air leaks.

For further information or assistance with these proce­dures, contact the Mammoth Service department.

MAMM-VCS-IOM-1EB (October 2011)

6

Ductwork and Attenuation

Discharge ductwork is normally used with the V-Cube
Slim™. Return air ductwork may also be required.

All ductwork should conform to industry standards
of good practice as described in the ASHRAE Systems
Guide.

The discharge duct system will normally consist of
a flexible connector at the unit connection, a transition
piece to the full duct size, a short run of duct,
and elbow with vanes, and a trunk duct teeing into
a branch duct with discharge diffuses. The transition
piece must not have angles totaling more than
30° or severe reduction in airflow performance can re­sult.

V entilation Air

Outside air may be required for ventilation. The tem­perature of the ventilation air must be controlled so that
the mixture of outside air and return air entering the
unit is within application limits. It is typical to close off
the ventilation air system during unoccupied periods
(i.e. night setback).

Do not connect the full duct size to the unit. Use a tran­sition piece sized according to the discharge collar on
the unit to get to the full duct size. With metal duct ma­terial, the sides of only the elbow and entire branch
duct should be internally lined with acoustic fibrous in­sulation for sound attenuation. Glass fiber duct board
material is more absorbing and may permit omission of
the canvas connector.

The ductwork should be laid out so that there is no
line of sight between the unit discharge and
the distribution diffusers.

Return air ductwork (if used) should be connected to
the unit using the filter section flange..

The ventilation air system is typically a separate build­ing subsystem with distribution ductwork. Simple intro­duction of the outside air into each return air plenum
chamber reasonably close to the unit air inlet is
recommended. Do not duct outside air directly to the
unit inlet. Provide sufficient distance for the thorough
mixing of outside and return air.

MAMM-VCS-IOM-1EB (October 2011)

7

Supply Piping

1. All units should be connected to supply and return
piping in a two-pipe reverse return configuration. A
reverse return system is inherently self-balancing
and requires only trim balancing where multiple
quantities of heat pumps with different flow and
pressure drop characteristics exist in the same
loop. Check for proper water balance by measuring
differential temperature reading across the water
connections.

2. The piping may be steel, copper or PVC. Avoid
dissimilar metal fittings as they may corrode. If the
use of dissimilar metals cannot be avoided, use
dielectric isolation at that connection point

3. Supply and return run outs usually join the unit via
short lengths of high pressure flexible hose which
are sound attenuators for both unit operating noise
and hydraulic pumping noise. One end of the hose
should have a swivel fitting to facilitate removal for
service. Hard piping water connections is not rec­ommended due to the possibility of vibration that
can damage connections or pipe joints or noise
attenuation. Any hard piped connections must con­tain a union to facilitate removal of the piping or
unit.

4. Some flexible hose threaded fittings are supplied
with sealant compound. If not, apply Teflon tape to
provide a tight seal.

5. Supply and return shutoff valves are required at
each unit. The return valve is used for balancing
and should have a “memory stop” so that it can
always be closed off but can only be reopened to
the proper position for the flow required.

6. No unit should be connected to the supply and re­turn piping until the water system has been cleaned
and flushed completely. After the cleaning and
flushing has taken place, the initial connection
should have all valves wide open in preparation for
the water system flushing.

Condensate Piping

1. Condensate piping can be steel, copper, or PVC.
Each unit includes a condensate connection.

2. The condensate disposal piping must be trapped.
The piping must be pitched away from the heat
pump not less than ¼” per foot. The unit is supplied
with a 1-1/4” male pipe fitting to accommodate the
condensate drain connection.

3. Do not locate any point in the drain system above
the drain connection of any unit.

4. The condensate piping system must be vented at
its highest point.

MAMM-VCS-IOM-1EB (October 2011)

8

Cleaning and Flushing

1. Prior to first operation of the V-Cube Slim™, the
water circulation system must be cleaned and
flushed of all construction dirt and debris.

2. If the unit is equipped with water shutoff valves,
either electric or pressure operated, the supply and
return run-outs must be connected at each unit lo­cation. This will prevent the introduction of dirt into
the unit.

3. Fill the system with water with all air vents open.
When the unit is filled with water, close all air vents
to remove all air..

4. Start the main circulator with the pressure reducing
valve open. Check vents in sequence to bleed off
any trapped air to provide circulation through all
components of the system.

5. While circulating water, check for and repair any
leaks in the piping. Drains at the lowest point(s) in
the system should be opened for the initial flush
and blow down, making sure city water fill valves
are set to make up water at the same rate. Check
the pressure gauge at the pump suction and manu­ally adjust the makeup to hold the same positive
steady pressure both before and after opening the
drain valves. Flush should continue for approxi­mately two hours, or until the drain water is clear
and clean.

6. Shut off supplemental heater (if applicable) and
circulator pump and open all drains and vents to
completely drain down the system. Short circuited
supply and return run-outs should now be con­nected to the unit supply and return connections.

7. Refill the system with clean water. Test the water
using litmus paper for acidity, and treat as required
to leave the water slightly alkaline (pH 7.5 to 8.5).
The specified percentage of antifreeze may also be
added at this time. Use commercial grade anti­freeze designed for HVAC systems only. Do not
use automotive grade antifreeze.

8. Once the system has been filled with clean water
and antifreeze (if used), precaution should be taken
to protect the system from dirty water conditions.
Dirty water will result in system wide degradation of
performance and solids may clog valves, strainers,
flow regulators, etc. Additionally, the heat exchang­ers may become clogged which reduces compres­sor service life or causes premature failure.

9. Set the loop water controller heat add setpoint to
70°F and the heat rejection setpoint to 85°F. Sup­ply power to all motors and start the circulation
pumps. After full flow has been established through
all components including the heat rejecter
(regardless of season) and air vented and loop
temperatures stabilized, each of the units will be
ready for check, test and start-up, and water bal­ancing.

MAMM-VCS-IOM-1EB (October 2011)

9

Start-up

1. Open all valves to the full open position and turn on
power to the V-Cube Slim™.

2. Set room temperature sensor for “Fan Only” opera­tion by selecting “Off” at the system switch and
“On” at the fan switch. If “Auto” fan operation is se­lected, the fan will cycle with the compressor.
Check for proper air delivery.

3. A 5 minute anti-short cycle delay is inherent to the
unit’s microprocessor board. After the 5 minute
delay, check the discharge air temperature using
the unit keypad.

4. Measure the temperature difference between en­tering and leaving water. The difference in water
temperature should be approximately 1 ½ times
greater in the cooling mode as compared to the
heating mode . Adjust the combination shutoff/
balancing valve in the return line to a water flow
rate which will result in the temperature difference.

5. In the heating mode, with the entering water tem­perature in the range of 60°F to 80°F, the tempera­ture difference between the entering water and
leaving water should be between 6°F to 12°F. In
the cooling mode, if the leaving air temperature
falls below 35°F, adjust water flow to the unit to >3
gpm/ton to avoid freeze damage to the unit.

6. To verify proper drainage of condensate, slowly
add water to the condensate pan until proper drain­age is accomplished.

7. If the unit fails to operate, check the following:
a. Verify that the incoming power to the unit

matches the nameplate and that the main dis­connect is turned on.

b. Verify a call for heating or cooling is present.

8. If the unit starts but after a short time trips on high
or low head pressure, check the following:

a. Verify that airflow is not impeded by a dirty air

filter, improper fan rotation or improper duct
sizing.

b. Verify that the water flow rate is within limits.

Check the water flow balance and back flush if
necessary.

MAMM-VCS-IOM-1EB (October 2011)

10

Operating Limits

Environment

This equipment is designed for indoor installation only.
Sheltered locations such as attics, garages, etc., gen­erally will not provide sufficient protection against ex-

APPLICATIONLIMITS

WATERTEMPERATURES/DegreesF*



MINIMUMENTERINGFLUIDTEMPERATURE

MAXIMUMENTERINGFLUIDTEMPERATURE

*Applicationlimitsapplyatorabovestandardflowratesspecifiedforsizeofunit.

APPLICATIONLIMITS

AIRTEMPERATURES/DegreesF*



MINIMUMAMBIENTAIRTEMPERATURE**

MAXIMUMAMBIENTAIRTEMPERATURE**

MINIMUMENTERINGAIRTEMPERATURE

MAXIMUMENTERINGAIRTEMPERATURE

*Applicationlimitsapplyat

orabovestandardflowratesspecifiedforsizeofunit.

**Minimumandmaximumambientconditionsapplytoductedsupplyandreturnunitsonly.

tremes in temperature and/or humidity, and equipment
performance, reliability, and service life may be ad­versely affected.

Standardrange LowTempGeothermal

COOLING HEATING COOLING HEATING

50˚ 50˚ 40˚ 25˚

110˚ 90˚ 110˚ 90˚

Standardrange LowTempGeothermal

COOLING HEATING COOLING HEATING

50˚ 50˚ 50˚ 50˚

110˚ 110˚ 110˚ 110˚

65˚ 50˚ 65˚ 40˚

100˚ 80˚ 100˚ 80˚

Additional Information For Water Source Heat Pump Units Only

Standard range water source heat pump units

Units are designed to start-up in an ambient of 50°F (10°C), with
entering air at 50°F (10°C), with entering fluid at 70°F (21°C), with
both air and fluid flow rates used in the ISO 13256-1 rating test, for
initial start-up in winter. Note that this is not a normal or continuous
operating condition. It is assumed that such a start-up is for the pur­pose of bringing the building space up to occupancy temperature.

Geothermal range water source heat pump units

Geothermal heat pump units are designed to start-up in an ambient
of 40°F (5°C), with entering air at 40°F (5°C), with entering fluid at
25°F (-4°C), with both air and fluid at flow rates used in the ISO
13256-1 rating test, for initial start-up in winter. Note that this is not a
normal or continuous operating condition. It is assumed that such a
start-up is for the purpose of bringing the building space up to occu­pancy temperature.

MAMM-VCS-IOM-1EB (October 2011)

Operating voltages

208-230/60/3 . . . . . . . . . . . . . . . . . . . . 197 volts min.; 253 volts max.

460/60/3 . . . . . . . . . . . . . . . . . . . . . . . . 414 volts min.; 506 volts max.

380-415/50/3. . . . . . . . . . . . . . . . . . . . ..342 volts min.; 418 volts max

575/60/3. . . . . . . . . . . . . . . . . . . . . . . . .515 volts min.; 632 volts max.

Note:

Units operating with over- and under-voltage conditions
for extended periods of time will experience premature
component failure. Three phase system imbalance
should not exceed 2%.

11

Mammoth EPiC™ Systems

I/O Flex 6126

The standard factory-integrated DDC controller pro­vides control flexibility that can be easily customized to
meet any sequence of operation needs. It is fully capa­ble of operating in a 100% stand-alone mode or can
connect to a Building Automation System (BAS) using
any of today’s four leading protocols: BACnet, Modbus,
N2, and Lontalk. The base controller provides 12 in­puts and 12 outputs plus supports the 8160 expander
module if additional inputs/outputs are required.

Key Features and Benefits

 6160 I/O points: 6 digital outputs, 12 universal inputs, and 6 analog outputs.
 8160 I/O points: 16 universal inputs, 8 digital outputs.
 Optional built-in protocol support: BACnet® (ARCNET, MS/TP, and PTP modes), Modbus® (RTU and ASCII

modes supported), N2, or Lontalk®.

 Powerful, high-speed 16-bit microprocessor with 1 MB Flash memory and 1 MB of battery-backed RAM
 Built-in support through an Rnet port for control’s custom configurable keypad/display unit, BACview6 (4-line by

40 character per line display) for intelligent sensors.

 For variable air volume (VAV), constant volume (CAV), and make-up air (MAU) ap plications.

MAMM-VCS-IOM-1EB (October 2011)

12

Examples of I/O’s

INPUTS

Point Description
UD #1
UD #2
UD #3

UD #4 Contact, 0-10VDC,
UD #5

UD #6
UD #7
UD #8
UD #9

UD #10
UD #11
UD #12

Point Description
UO #1
UO #2
UO #3
UO #4
UO #5

UO#6

DO #1
DO #2
DO #3
DO #4
DO #5
DO #6

+Pulse
Room Air Temperature
RTD/Therm/Dry

0-20MA

 Supply Fan Status Compressor Fault Condensate Overflow
 Duct Static Pressure or Airflow Switch
 Filter Static Pressure or Dirty Filter Switch #1
 Outside Air Temperature (AiSE Only)
 Condenser Water Temperature
 Entering Air Temperature or Return Air Temperature (AiSE)



4-20mA, 0-10Vdc
Heating Source Control Signal
0-10 Vdc

Supply Fan VFD Control Signal

120 VAC
FORM C

 Field-Lin (MWU or Open Min OA)
 Common Alarm





BMS Supply Air, Duct Static Reset or Room Air Temperature Setpoint

System Switch Emergency Shut Down Remote Start
High Static Low Static VFD in Bypass
Economizer Lockout Cooling Lockout Heating Lockout

Supply Air Temperature

OUTPUTS

Spare

Economizer Valve (WiSE)/Damper Control Signal (AiSE)
WiSE Bypass Valve Signal
Spare

Start Supply Fan
Start Condenser Pump or Switch Reversing Valve

Compressor Call #2
Compressor Call #1

MAMM-VCS-IOM-1EB (October 2011)

13

Mammoth EPiC™ Systems

Keypad

Locally access controllers and operational properties
with the easy-to-use BACview6 keypad/display. It plugs
into an Rnet connection on a 6126 controller and al­lows you to display and modify properties. The BAC­view

6 features a numeric keypad, directional keys, and

four programmable function keys. A large 4-line by 40­character backlit LCD display is provided for easy read­ing even in poor lighting conditions. The device also
includes an alarm indicator light.

Key Features and Benefits

 Compatible with all EPiC system controllers.
 Flexible design allows panel or wall mounting; can be located up to 500 feet from the controller.
 Hand-held version can be plugged into RS room temperature sensors.
 Backlit LCD display enhances reading even in poor lighting conditions.
 Customized menus for each product.
 Password protection provides security.
 One keypad can be used on different units/programs since the menus a re pa rt of the control program.

MAMM-VCS-IOM-1EB (October 2011)

14

General Maintenance

Normal maintenance on any V-Cube Slim™ unit in­cludes buy may not be limited to:

 Air filter changes. Air filters must be replaced a

minimum of two times per year. A good standard
to follow is at the beginning of the heating season
and the beginning of the heating season. In certain
environments, more frequent filter changes may be
required. For new installations, it is recommended
that the air filters be checked every 60 days and
changed as required until a regular interval can be
established. An air filter needs to be replaced if no
light can be seen through it when it is held up to a
light.

 Condensate drain. The condensate drain and

drain pan should be checked on an annual basis to
verify positive drainage and cleaned or flushed as
necessary.

 Data recording. Recording current draw of com-

pressors and blower motors at regular intervals is
recommended to verify their condition. Recording
differences in water temperature and air tempera­ture at regular intervals can help identify any per­formance degradation. Annual comparison of the
data will aid in determining the overall condition
and operation of the unit.

 Nuisance trips and/or lockouts. Occasional trips

and/or lockouts are generally caused by water or
airflow restrictions. When a trip or lockout occurs,
check the water flow rate, incoming water tempera­ture, airflow rates and incoming air temperature.
Take corrective action necessary to enable unit
operation.

Brazed plate heat exchanger cleaning

When it is necessary to flush and clean a brazed plate
heat exchanger, circulate a diluted mixture of cleaning
acid for a Clean-in-Place (CIP) process. A five percent
solution of phosphoric acid is an effective choice for
most units. If frequent cleaning is required, use a five­percent solution of oxalic acid.

For best results, the cleaning solution flow rate should
be at least 1.5 times the normal flow rate, preferably in
backflush mode. Before restarting, flush the unit with
fresh water to purge any remaining acid.

MAMM-VCS-IOM-1EB (October 2011)

15

Troubleshooting

R-410A

The In’s and Out’s of R-410A

R-410A is a non-ozone depleting blend of two
Refrigerants — HFC-125 and HFC-32 in a fifty percent
mixture. Refrigerant 410A exhibits higher operating
pressure and refrigeration capacity than R-22.

Although R-410A is non-flammable at ambient tem­perature and atmosphere pressure, it can become
combustible under pressure when mixed with air.
(NOTE: R-410A should not be mixed with air under
pressure for leak testing. Pressure mixtures of dry nitro­gen and R-410A can be used for leak testing.)

Lubrication

R410A should be used only with polyolester (POE) oil.
The HFC refrigerant components in R-410A will not be
compatible with mineral oil or alkylbenzene lubricants.
R-410A systems will be charged with the OEM recom­mended lubricant, ready for use with R-410A.

Troubleshooting Refrigeration Circuit

Symptom

Charge

Undercharge
System
(Possible Leak)

Overcharge Sys­tem
Pressure

Low Air Flow
Heating

Low Air Flow
Cooling

Low Water Flow
Heating

Low Water Flow
Cooling

High Air Flow
Heating

High Air Flow
Cooling

High Water Flow
Heating

High Water Flow
Cooling

TXV Restricted High Low

Head

Pressure

Low Low Low High Low Low Low Low Pressure

High High High Normal Low

High High High

Low Low Low

Low Low

Normal Normal

High High High High Low Low High High Pressure

Low Low Low Low High Low Low Low Temp

Low High Normal High Low Low Normal High Pressure

Normal Low Low Low Normal Normal Low High Pressure

Low Low Low Low HIgh Normal Low Low Temp

Suction

Pressure

Compressor

Amp Draw

Low Low High Low High Low Temp

Normal

Low

Charging

Due to the zeotropic nature of R-410A, it should be
charged as a liquid. In situations where vapor is nor­mally charged into a system, a valve should be in­stalled in the charging line to flash the liquid to vapor
while charging.

WARNING!

It is very important to make certain that the recycle or
recovery equipment used is designed for R-410A. The
pressure of R-410A refrigerant is approximately 60
percent greater than that of R-22. Pressure gauges
require a range up to 800 PSIG high side and 250
PSIG low side. Recovery cylinders require a 400 PSIG
rating.

All Mammoth V-Cube Slim units are designed
for commercial use. Units are designed for the
cooling mode of operation and fail safe to heating.

Super

Heat

High

Normal

Low

Normal

High High Low Low

Subcooling

Low High Low High Pressure

Low Low Low Low Temp

Air

Temp

Differential

Normal

Low

Water

(Loops)

Temp

Differential

Normal High Pressure

Safety

Lock

Out

MAMM-VCS-IOM-1EB (October 2011)

16

Performance Troubleshooting

Performance
Troubleshooting

Insufficient Capacity X X Dirty Filter Replace or clean

Not cooling or heating
properly

X X Leaky ductwork

Unit doesn’t operate in
cooling

X X

X Defective reversing valve Perform RV touch test

X X Unit undersized

X X

X X Inlet water too hot or cold Check load, loop sizing, loop backfill, ground moisture

High head pressure X

X

X Inlet water too hot Check load, loop sizing, loop backfill, ground moisture

Heating Cooling Possible Cause Solution

X X Reduced or no air flow

X X Low refrigerant charge Check superheat and subcooling

Restricted metering de­vice

Scaling in waterside heat
exchanger

Reduced or no air flow in
heating

Reduced or no water flow
in cooling

Check for dirty air filter and clean or replace, Check fan motor operation
and airflow restriction. External static too high? Check static vs. blower
table

Check supply and return air temperatures at the unit and at distant duct
registers: If significantly different, duct leaks are present

Check superheat and subcooling– replace

Recheck loads & sizing. Check sensible, cooling load and heat pump ca­pacity

Perform scaling check and clean if necessary

Check for dirty air filter and clean or replace. Check fan motor operation
and airflow restrictions. External static too high? Check static vs. blower
table

Check pump operation or valve operation/setting. Check water flow; adjust
to proper flow rate

X

X

X X Unit overcharged Check superheat and subcooling

X X

Low suction pressure X

X

X

X

X X Insufficient charge Check for refrigerant leaks

Low discharge air
temperature in heating

X Poor performance See insufficient capacity

X Too high of air flow Check fan motor speed selection and airflow

Air temperature out of
range in heating

Scaling in waterside heat
exchanger

Non-condensable in
system

Reduced water flow in
heating

Water temperature out of
range

Reduced air flow in cool­ing

Air temperature out of
range

Bring return air temp within design parameters

Perform scaling check and clean if necessary

Vacuum system, reweigh in charge

Check pump operation or valve operation/setting. Check water flow; adjust
to proper flow rate

Bring water temp within design parameters

Check for dirty air filter and clean or replace. Check fan motor operation
and airflow restrictions. External static too high? Check static vs. blower
table

Too much cold vent air? Bring entering air temp within design
parameters

MAMM-VCS-IOM-1EB (October 2011)

17

UNIT CHECK-OUT SHEET

Customer Data

Customer Name ________________________________________ Date __________________________________ _______
Address ________________________________________________________________________________________________
Phone ________________________________________________ Unit Number___________________________________

Unit Nameplate Data

Make _______________________ Model Number _______________________ _ Serial Number _______________________
Compressor(s):
# 1: RLA_______ LRA _______ Refrig, Charge (oz.) _______ # 2: RLA_______ LRA _______ Refrig, Charge (oz.) ______
# 3: RLA_______ LRA _______ Refrig, Charge (oz.) _______ # 4: RLA_______ LRA _______ Refrig, Charge (oz.) ______
Blower Motor(s):
# 1: FLA (or NPA)________ HP __________ # 2: FLA (or NPA)________ HP __________
# 3: FLA (or NPA)________ HP __________ # 4: FLA (or NPA)________ HP __________
Maximum Fuse Size (Amps) __________ _____________ Minimum Circuit Ampacity (Amps) __________________

Operating Conditions

Unit Conditions Cooling Mode Heating Mode Measured At:

Entering Air Temperature _____________ _____________ _________________________________
Leaving Air Temperature _____________ _____________ _________________________________
Entering Fluid Temperature _____________ _____________ n/a

Leaving Fluid Temperature _____________ _____________ n/a
Fluid Flow (gpm) _____________ _____________ n/a

Fluid Side Pressure Drop _____________ _____________ n/a

Compressor # 1 # 2 # 3 # 4
Mode Cooling Heating Cooling Heating Cooling Heating Cooling Heating

Suction Pressure (psig) _______ _______ _______ _______ _______ _______ _______ _______
Discharge Pressure (psig) _______ _______ _______ _______ _______ _______ _______ _______

Suction Temp (at compressor) _______ _______ _______ _______ _______ _______ _______ _______
Discharge Temp (at compressor) _______ _______ _______ _______ _______ _______ _______ _______
Suction Superheat (at compressor) _______ _______ _______ _______ _______ _______ _______ _______
Liquid Line Leaving Condenser Temp _______ _______ _______ _______ _______ _______ _______ _______
Liquid Subcooling _______ _______ _______ _______ _______ _______ _______ _______

Volts/Amps
Phase

Compressor Volts _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____
Compressor Amps _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____
Blower Volts _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____
Blower Amps _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____

L1 L2 L3 L1 L2 L3 L1 L2 L3 L1 L2 L3

MAMM-VCS-IOM-1EB (October 2011)

# 1 # 2 # 3 # 4

18

Notes

[e-mail]
www.mammoth-inc.com

Mammoth, Inc. has a policy of continuous product improvement and reserves the right to
change design and specifications without notice. FANWALL TECHNOLOGY
FANWALL® are trademarks of Huntair, Inc. This product is covered by one or more of the
following U.S. patents (7,137,775; 7,179,046; 7,527,468; 7,597,534) and other pending
U.S. or Canadian patent applications and/or foreign patents.

®

and

© 2011 Mammoth, Inc.
MAMM-VCS-IOM-1EB
October 2011