Important: These instructions are for the use of
specially trained personnel, experienced in the
installation of this equipment and related system
components. Some states require licensing of
installation and service personnel. Unqualified
individuals should not attempt to interpret these
instructions or install this equipment. Read
instructions carefully before unpacking, installing and
operating this heat pump unit.
Inspection: This heat pump has been factory
inspected prior to shipment. However, we
recommend you check the carton before unloading
WATER SOURCE HEAT PUMPS
100 Percent Outside Air Units
Sizes 071 thru 381
Installation,
Operation
and Maintenance
Instructions
Voltage:
F = 208-230/60/3
G = 460/60/3
K = 575/60/3
J = 380/50/3
Unit Size (Nominal Cooling):
071 = 72,250 Btu/hr. cooling
111 = 111,000 Btu/hr.cooling
141 = 148,000 Btu/hr.cooling
181 = 183,000 Btu/hr cooling
221 = 226,000 Btu/hr cooling
271 = 270,000 Btu/hr cooling
321 = 330,000 Btu/hr cooling
381 = 381,000 Btu/hr cooling
Unit Type:
MHC = 100% Outside Air,
Standard Temperature Range
Design Series “C”
MLC = 100% Outside Air,
Low Temperature Geothermal,
Design Series “C”
and note any transit damage on all copies of the bill
of lading. Also inspect the unit for concealed shipping
damage after removing packaging. Transit damage
claims must be filed promptly with the freight
company by the purchaser.
Handling: Always handle with care and in the
horizontal position as shipped on the pallet. Moving
the heat pump on its side or dropping it may damage
internal parts.
Location: Unit must be installed indoors in any area
allowing adequate room for mounting of unit and with
access for maintenance and service.
Nomenclature
G - 141 - MHC
Mammoth is committed to a policy of
continuous. product improvements, and thus
reserves the right to.change specifications and
design without notice.
© 1/2003 Mammoth Inc.
(P/N 71144921)
Mammoth Inc.
www.mammoth-inc.com
U-5
2 U-5 IOM
Installation
Definition
Twin circuit 100% Outside Air unit with one fan outlet
and two independent refrigerant circuits.
Unit placement – ceiling hung
Mammoth’s 100% outside air heat pump can be
hung from the ceiling using the mounting rails
attached to the unit and with vibration isolation
grommets shipped inside the unit’s electric
compartment.
1. Fit the grommets into the
3
⁄4-inch diameter holes
on the mounting rails. Use
5
⁄16-inch or 3⁄8-inch
threaded rods (supplied by others) to hang the
unit from the ceiling. Cover the entire bottom of
the 1
1
⁄4-inch diameter grommet with a washer
(supplied by others).
Figure 1. Ceiling-hung placement
Note: Never attempt to raise, lower or adjust the
pitch of the unit by turning the units on the hanger
rods without first taking the weight of the unit
completely off the vibration isolation grommets.
2. Mount the unit with a 5-degree (maximum) pitch
toward the condensate drain connection. Outside
air units are available with an optional bottom drain
connection. In the ceiling-mounted arrangement
this option will allow for more effective condensate
removal.
3. See unit data sheet for dimensional information.
Unit placement – slab-mounted
Mammoth’s 100% outside air heat pump can also be
installed on a flat level surface. It is recommended
that vibration mounts be placed under the unit to
prevent transmission of vibrating to the building
structure. The standard side drain connection is
required in this arrangement.
See unit data sheet for further dimensional details.
Water Out
Water In
Mounting Rail
GROMMET DETAIL
Threaded Rod
(By Others)
Low V oltage
Connection
Main Power
Connection
Condensate Connection
Threaded Rod
(By Others)
See Grommet
Mounting Rail
Detail
Base
Retaining Nuts
(By Others)
Mounting Rail
Vibration Isolation Grommet
Washer (By Others) Must Cover
Entire Bottom of Grommet
U-5 IOM 3
Ductwork
Water supply
Fasten the supply ductwork to the collar provided.
Use a flexible duct connection between the unit and
the supply duct. Make sure the blower wheel turns
freely and is centered before making the connection.
If a return air is used, it may be fastened to the
flanges on the filter guides. Make sure there is easy
access for filter replacement.
The discharge or supply air duct should be insulated
and have at least on 90-degree bend prior to the first
discharge grille. Heat pump life expectancy and
efficiency depends on adequate airflow. For nominal
cfm information see unit data sheet.
The heat pump must not be operated without water
flowing through its water-to-refrigerant heat
exchanger coils. Severe damage to the unit may
result.
For proper water flow rates, refer to the unit
specification sheet.
Condensate drain
See Figures 2 and 3
The condensate drain is set up for
7
⁄
8-inch O.D.
copper connection. The condensate pipe or hose
installed must have a minimum 3-inch trap in the
condensate line. All condensate piping must pitch
Figure 2. Condensate trap detail – bottom drain
Figure 3. Condensate trap detail – side drain
Application limits
COOLING
STD. TEMP. LOW TEMP.
MINIMUM ENTERING WATER/BRINE 55 F 30 F
MAXIMUM ENTERING WATER 110 F 110 F
MINIMUM ENTERING AIR 60 F 60 F
MAXIMUM ENTERING AIR 100 F 100 F
HEATING
STD. TEMP. LOW TEMP.
MINIMUM ENTERING WATER/BRINE 50 F 25 F
MAXIMUM ENTERING WATER 90 F 90 F
MINIMUM ENTERING AIR 40 F* 40 F*
MAXIMUM ENTERING AIR 80 F 80 F
Only one maximum condition can exist at the same
time.
*Note: The minimum entering air temperature must
not fall below 40 F.
If the outside air is cooler than 40 F it must be
preconditioned or the unit must be shut off.
Mammoth offers both optional electric and hot water
preheat coils for this situation. See page 5 for
additional information on the heaters.
away from the unit for proper drainage by gravity and
as required by local codes. Condensate drains are
available as either standard side connection or
optional bottom connection.
Closed loop systems
1. Unit should be left unconnected or isolated using
gate valves as the building water loop is initially
flushed.
2. Water system should be filled with 1 lb. trisodium
phosphate for every 50 gallons of water.
3. The piping should then be purged of trapped air,
supplemental heater set to maintain 110 F and the
solution circulated for approximately 8 hours.
4. The system should then be drained completely
and the entire flushing process repeated, if
necessary.
5. After completely cleaned and drained, fill loop with
water at an alkaline level of approximatelly pH 7.5.
6. Connect heat pump the the piping loop.
7. Make sure all entrained air is purged from loop.
Determine that specified flow rate through each
unit is established.
Bottom
of Unit
2-inch
Min. Trap
3"
7/8" O.D.
Condensate
1.5-inch Min. Internal
Trap (By Others)
4 U-5 IOM
Electrical service and fuses
Warning: Turn off electrical power before servicing
controls. Severe electrical shock may result unless
power is turned off.
Unit must be installed in compliance with NEC and
local codes.
Route wires through a properly sized disconnect
switch. Consult the wiring diagrams that are found in
this manual and inside the cover of the electrical box
to complete the connection. see nameplate for proper
fuse sizing, minimum circuit ampacity and voltage
requirements. An auxiliary electrical heater must be
installed with a power supply separate from the heat
pump.
All factory installed electric preheat coils require a
separate power supply. See the unit specification
sheet for more information.
Control wiring
All of the heat pump functions are controlled by
remote thermostat and must be wired as shown,
using approved 18-gauge copper wire.
Electric supply
Changing filters
The filters can be accessed from either side of the
unit. The filter access panels (see Figure 4) are held
in place by several sheet metal screws. After one of
the access panels have been removed the filters will
slide out.
The same access panel that allows access to the
standard 2-inch filters also allows access to the
optional 4-inch thick panel filters.
Figure 4. Access panels
Optional hose kits
The flexible water hoses are 2-foot stainless steel
hoses for water connections to the heat pump and
adapters. Use two properly sized wrenches, one on
the unit FPT fitting and one on the hexagonal fitting
on the hose, when connecting hoses. Do not use
wrench on hose or sleeve that crimps the fitting onto
the hose. Hoses must not be subjected to stress of
being pulled taut, twisted or kinked. Connections
should not be over tightened.
Before pressurizing the water system, closely inspect
hoses and fittings to be sure there are no cuts,
abrasions, twists, kinks, stretch and hoses will not be
in contact with any sharp surface or edge while in
use. Also available for heat pumps is a condensate
hose and two hose clamps.
For Mammoth hose kit information as to installation
and specifications, see data sheets C-91 and C-93.
Preheat Section
Filter Access Section
U-5 IOM 5
Optional preheat section
The preheat section is located after the outside air
damper section and the filter section. It can be
access via access panels on either side of the heat
pump (see Figure 4).
Electric Preheat — Optional
The Mammoth 100% Outdoor Air unit provides
optional electric heat to preheat the outdoor air to a
point where efficient compressor heating can take
place.
The electric heater is a pre-assembled package
designed to be installed internal to the unit. The
elements are constructed of nichrome wire and
include thermal limits, duct high limit, air proving
switch, and nonfused disconnect switch. The heater
operation is determined by outside air temperature, to
maintain a minimum 40 F entering air temperature to
the airside coil.The minimum entering air temperature
to the air coil is 40 F to allow operation of the
mechanical refrigeration for heating.
Figure 5. Optional preheat wiring diagram
The heater includes its own control box separate
from the unit’s electrical panel. It is mounted on the
outside of the unit casing, which houses all the heater
control components and safety devices. The heater is
U.L. listed. A separate power source from the unit is
required.
Hot Water Preheat — Optional
The Mammoth 100% Outdoor Air unit provides
optional hot water coils to preheat cold outdoor air to
a point where efficient compressor heating can take
place.
The hot water coil is constructed of aluminum fins
bonded to seamless copper tubes.
Units with the optional temperature control system
include a two-way, two-position, spring return valve
actuator. The valve actuator is controlled to maintain
a minimum 40 F entering air temperature to the air
coil to allow operation of the mechanical refrigeration
for heating. A freezestat closes the outdoor air
dampers and stops the fan and compressor if mixed
air is below 33 F.
6 U-5 IOM
Figure 6. 100% outside air unit wiring diagram
208/230 or 460 VOLTS
60 HERTZ, 3 PHASE
SEE NOTE 2
CIRCUIT #1
COOLING ONLY (FIRST STAGE)
WITH HOT GAS REHEAT
(DEHUMIDIFICATION)
F
SEC
#1
COMPRESSOR
T3
T1
T2
T3
T2 T1
L3 L2
L1
1M
L3
L2
L1
POWER
BLOCK
50 VA
TRANSFORMER
24 VA C
75 VA
TRANSFORMER
24 VA C
TERMINAL
STRIP
24 VA C
COMPRESSOR #1
COMPRESSOR #2
FAN
REVERSING VALVE (CIRCUIT #2)
RESET LIGHT
DEHUMIDIFICATION (CIRCUIT #1)
C1
R
PINK/BLACK STRIPE
Y1
Y2
G
O
L
H
E
C2
1
2
BLUE
YELLOW
BLUE
PINK
BLACK
PURPLE
ORANGE
PINK/BLACK STRIPE
#1
#2
SEE NOTES
1, 4 & 5
SEE NOTES
1, 4 & 5
BLACK
BLACK
BLACK
YELLOW
BLUE
1R
3
1
4
5
2
CS
LP
HP
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