Bosch SM024 Specifications

SM AH Series Heat pump
SM024 | SM036 | SM048 | SMO60 | SM070
873392084 (2013/11)
Installation, Operation and Maintenance Manual
2|
SM AH Series Heat Pump
CONTENTS
SYSTEM CHECKOUT.........................................................13
AH MODEL NOMENCLATURE .............................................. 3
KEY TO SYMBOLS .............................................................. 3
SAFETY WARNINGS ........................................................... 3
INITIAL INSPECTION .......................................................... 4
SM AH STANDARD PACKAGES ........................................... 4
GENERAL DESCRIPTION .................................................... 4
MOVING AND STORAGE ..................................................... 4
SAFETY CONSIDERATIONS................................................. 4
Location............................................................................ 4
Air Handler ................................................................. 4
Condensing Section ..................................................... 5
UNIT START-UP................................................................13
INITIAL START-UP ............................................................14
MAINTENANCE ................................................................14
OPERATING PRESSURES & TEMPERATURES......................15
UNIT CHECKOUT SHEET ...................................................20
TROUBLESHOOTING ........................................................21
WIRING DIAGRAMS..........................................................23
DIMENSIONAL DRAWINGS ...............................................25
NOTES.............................................................................27
Installation........................................................................ 5
Condensing Section ..................................................... 5
Mounting Vertical Air Handler Units ................................ 5
Mounting Horizontal Air Handler Units............................. 6
CONDENSATE DRAIN ......................................................... 6
DUCT SYSTEM................................................................... 7
ELECTRICAL ..................................................................... 7
Electric Heater Package Option...................................... 7
Low Voltage Control Wiring ........................................... 8
Electronic Thermostat Installation .................................. 9
ECM Interface Board .................................................. 10
Thermostat Connections............................................. 10
SEQUENCE OF OPERATION .............................................. 11
Cooling Mode ............................................................ 11
Heating Mode............................................................ 11
REFRIGERANT LINES ....................................................... 11
Linear vs Equivalent Line Length .................................. 12
Connecting Refrigerant Lines....................................... 12
CHARGING THE SYSTEM .................................................. 13
Figure 1: CS/AH Pairings
UNIT MODEL
Unit 1
SM024-1CSC SM024-1AVX
SM036-1CSC SM036-1AVX
SM048-1CSC SM048-1AVX
SM060-1CSC SM060-1AVX
SM070-1CSC SM070-1AVX
Paired Air Handler
Unit 3
Unit 4
DX025-1VTX
DX025-1CCX
DX035-1VTX
DX035-1CCX
DX049-1VTX
DX049-1CCX
DX061-1VTX
DX061-1CCX
DX071-1VTX
DX071-1CCX
Unit 2
SM024-1AHX
SM036-1AHX
SM048-1AHX
SM060-1AHX
SM070-1AHX
Unit 5
DX025-1UCX
DX035-1UCX
DX049-1UCX
DX061-1UCX
DX071-1UCX
Unit 6
DX035-1VTX
DX049-1VTX
DX071-1VTX
LEGEND:
AVX
BOSCH box style Vertical Air Handler
AHX
BOSCH box style Horizontal Air Handler
CCX
Cased coil
UCX
Uncased coil
VTX
Motex unitary style air handler
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
AH Model Nomenclature | 3
AH MODEL NOMENCLATURE
SM
024
-
1
AV X
-
X L
T
A
FAN MOTOR OPTIONS
SERIES
SM
A - Constant Airflow ECM
SIZE
DISCHARGE AIR CONFIGURATION
024
036
048
060
070
T - Top (AV only)
S - Straight (AH only)
E - End (AH only)
RETURN AIR CONFIGURATION
L - Left
R - Right
X - None
VOLTAGE DESIGNATIONS
1
- 208/1/60 & 230/1/60
CABINET CONFIGURATION
Not Used for Air Handlers
AH - Air Handler Horizontal
AV - Air Handler Vertical
Revision Level A
Figure # 2
KEY TO SYMBOLS
Warnings
Warnings in this document are identified by
a warning triangle printed against a grey
background. Keywords at the start of the
warning indicate the type and seriousness
of the ensuing risk if measures to prevent
the risk are not taken.
The following keywords are defined and can be
used in this document:
• NOTE indicates a situation that could result in
damage to property or equipment.
• CAUTION indicates a situation that could
result in minor to medium injury.
• WARNING indicates a situation that could
result in sever injury or death.
• DANGER indicates a situation that will result in
severe injury or death.
SAFETY WARNINGS
Installation and servicing of this equipment
can be hazardous due to system pressure
and electrical components. Only trained
and qualified personnel should install,
repair, or service the equipment.
Before performing service or maintenance
operations on the system, turn off main
power to the unit. Electrical shock could
cause personal injury or death.
When working on equipment, always
observe precautions described in the
literature, tags, and labels attached to the
unit. Follow all safety codes. Wear safety
glasses and work gloves. Use a quenching
cloth for brazing, and place a fire
extinguisher close to the work area.
Important Information
This symbol indicates important information
where there is no risk to property or people.
Revised 11-13
All refrigerant discharged from this unit
must be recovered WITHOUT EXCEPTION.
Technicians must follow industry accepted
guidelines and all local, state, and federal
statutes for the recovery and disposal of
refrigerants. If a compressor is removed
from this unit, refrigerant circuit oil will
remain in the compressor. To avoid leakage
of compressor oil, refrigerant lines of the
compressor must be sealed after it is
removed.
873392084 (2013/11)
4 | INITIAL INSPECTION
SM AH Series Heat Pump
To avoid equipment damage, DO NOT use
these units as a source of heating or cooling
during the construction process. Doing so
may affect the unit’s warranty. The
mechanical components and filters will
quickly become clogged with construction
dirt and debris, which may cause system
damage.
INITIAL INSPECTION
Be certain to inspect all cartons or crates on each
unit as received at the job site before signing the
freight bill. Verify that all items have been received
and that there are no visible damages; note any
shortages or damages on all copies of the freight
bill. In the event of damage or shortage, remember
that the purchaser is responsible for filing the
necessary claims with the carrier. Concealed
damages not discovered until after removing the
units from the packaging must be reported to the
carrier within 24 hours of receipt.
SM AH STANDARD PACKAGE
S
MOVING AND STORAGE
If the equipment is not needed for immediate
installation upon its arrival at the job site, it should
be left in its shipping carton and stored in a clean,
dry area. Units must only be stored or moved in the
normal upright position as indicated by the “UP”
arrows on each carton at all times. If unit stacking
is required, stack units as follows: Vertical units no
more than two high. Horizontal units no more than
three high.
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be
hazardous due to system pressure and electrical
components. Only trained and qualified personnel
should install, repair, or service the equipment.
Untrained personnel can perform basic functions
of maintenance such as cleaning coils and
replacing filters.
When working on equipment, always observe
precautions described in the literature, tags, and
labels attached to the unit. Follow all safety codes.
Wear safety glasses and work gloves. Use a
quenching cloth for brazing, and place a fire
extinguisher close to the work area.
The air handler blower should only be operated
when a duct is installed and secured to heat pump
duct collar in order to avoid possible injury.
1
LOCATION
2
To maximize system performance, efficiency and
reliability, and to minimize installation costs, it is
always best to keep the refrigerant lines as short
as possible. Every effort should be made to locate
the air handler and the condensing section as
close as possible to each other.
Air Handler
[1] SM Series Water-to-Air Heat Pump: Air Handler
[2] Installation and Operation Manual
GENERAL DESCRIPTION
These Split System Heat Pumps provide the best
combination of performance and efficiency
available. Safety devices are built into each unit to
provide the maximum system protection possible
when properly installed and maintained.
The SM Split Water-to-Air Heat Pumps are
Underwriters Laboratories (UL) and (cUL) listed
for safety. All SM Water-to-Air Heat Pumps conform
to UL1995 standard and are certified to CAN/CSA
C22.1 No 236 by Intertek-ETL
873392084 (2013/11)
Locate the air handler unit in an indoor area that
allows easy removal of the filter and access panels,
and has enough room for service personnel to
perform maintenance or repair. Provide sufficient
room to make electrical and duct connections. If
the unit is located in a confined space such as a
closet, provisions must be made for return air to
freely enter the space. On horizontal units, allow
adequate room below the unit for a condensate
drain trap.
The air handler units are not approved for
outdoor installation; therefore, they must be
installed inside the structure being
conditioned. Do not locate in areas that are
subject to freezing.
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Installation | 5
Condensing Section
Locate the condensing section in an area that
provides sufficient room to make water and
electrical connections, and allows easy removal of
the access panels, for service personnel to
perform maintenance or repair.
Consult the condensing section of this manual for
more information, or your CS factory’s tech
support.
If the condensing section is installed in a location
where ambient temperatures can fall below
freezing, some form of freeze protection should be
employed such as anti-freeze. Where the use of
anti-freeze is not possible for example in a ground
water application the fluid circulating pump should
operate continuously to prevent possible
condenser freeze-up and to optimize overall
system performance. Consult the factory in these
instances for guidance.
Water freezes at 32°F. Frozen water coils
are not covered under the limited product
warranty. It is the installer’s responsibility
to insure that the condensing section is
installed in a location or has the proper
controls to prevent rupturing the water coil
due to freezing conditions.
AH
CS
Figure # 3
INSTALLATION
Remove all shipping blocks under blower
housing.
Do not remove the protective caps or plugs from
the service valves until the refrigerant lines are
run and ready for final connection.
Mounting Vertical Air Handler Units
Vertical units should be mounted level on a
vibration absorbing pad slightly larger than the
base to minimize vibration transmission to the
building structure. (See Figure #4)
The installer should comply with all local codes
and regulations which govern the installation of
this type of equipment. Local codes and
regulations take precedent over any
recommendations contained in these instructions.
In lieu of local codes, the equipment should be
installed in accordance with the recommendations
made by the National electric code, and in
accordance with the recommendations made by
the National Board of Fire Underwriters. All local
seismic codes for seismic restraint of equipment,
piping, and duct work shall be strictly adhered to.
Condensing Section
Vibration Pad
Full Size
Figure # 4
Locate the condensing section in an area that
provides sufficient space to make water and
electrical connections, allowing easy removal of
the access panels. A 36" clearance in front of the
unit is recommended. This will ensure proper work
space for service personnel to perform
maintenance or repair.
Revised 11-13
873392084 (2013/11)
6 | CONDENSATE DRAIN
SM AH Series Heat Pump
Mounting Horizontal Air Handler Units
While horizontal units may be installed on any level
surface strong enough to hold their weight, they
are typically suspended above a ceiling by
threaded rods. The rods are usually attached to the
unit corners by hanger bracket kit. (See Figure #5).
The rods must be securely anchored to the ceiling.
Refer to the hanging bracket assembly and
installation instructions for details. All units
require four mounting brackets at the corners.
Horizontal units installed above the ceiling must
conform to all local codes. An auxiliary drain pan if
required by code, should be at least four inches
larger than the bottom of the heat pump. Plumbing
connected to the heat pump must not come in
direct contact with joists, trusses, walls, etc.
CONDENSATE DRAIN
If equipped with float style condensate overflow
switch, final adjustment must be made in the
field.
Make sure that the unused drain pan opening is
plugged prior to operating the air handler.
The air handler should be pitched approximately 1/
4" towards the drain in both directions, to facilitate
condensate removal. A drain line must be
connected to the air handler and pitched away
from the unit a minimum of 1/8" per foot to allow
the condensate to flow away from the unit. This
connection must be in conformance with local
plumbing codes. A trap must be installed in the
condensate line to insure free condensate flow.
(Units are not internally trapped). A vertical air
vent is sometimes required to avoid air pockets.
(See Figure #6).
The length of the trap depends on the amount of
positive or negative pressure on the drain pan. A
second trap must not be included.
Figure # 5
Some applications require an attic floor
installation of the horizontal air handler unit. In
this case the unit should be set in a full size
secondary drain pan on top of a vibration
absorbing mesh. The secondary drain pan prevents
possible condensate overflow or water leakage
damage to the ceiling. The secondary drain pan is
usually placed on a plywood base isolated from the
ceiling joists by additional layers of vibration
absorbing mesh. In both cases, a 3/4" drain
connected to this secondary pan should be run to
an eave at a location that will be noticeable. If the
unit is located in a crawl space, the bottom of the
unit must be at least 4” above grade to prevent
flooding of the electrical parts due to heavy rains.
Figure # 6
The condensing unit should be pitched
approximately 1/4" towards the drain in both
directions, to facilitate condensate removal. (See
Figure #6)
Figure # 7
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
DUCT SYSTEM
A supply air outlet collar and return air duct flange
are provided on all units to facilitate duct
connections. Refer to the FHP individual data
specification sheet for physical dimensions of the
collar and flange.
A flexible connector is recommended for supply
and return air duct connections on metal duct
systems. All metal ducting should be insulated
with a minimum of one inch duct insulation to
avoid heat loss or gain and prevent condensate
forming during the cooling operation. Application
of the unit to uninsulated duct work is not
recommended as the unit’s performance will be
adversely affected.
Do not connect discharge ducts directly to the
blower outlet. The factory provided air filter must
be removed when using a filter back return air grill.
The factory filter should be left in place on a free
return system.
If the unit will be installed in a new installation
which includes new duct work, the installation
should be designed using current ASHRAE
procedures for duct sizing. If the unit is to be
connected to existing ductwork, a check should be
made to assure that the duct system has the
capacity to handle the air required for the unit
application. If the duct system is too small, larger
ductwork should be installed. Check for existing
leaks and repair as necessary to ensure an air tight
seal within the duct.
The duct system and all diffusers should be sized
to handle the designed air flow quietly. To
maximize sound attenuation of the unit blower, the
supply and return air plenums should be insulated.
There should be no direct straight air path thru the
return air grille into the heat pump. The return air
inlet to the heat pump must have at least one 90
degree turn away from the space return air grille. If
air noise or excessive air flow are a problem, the
blower speed can be changed to a lower speed to
reduce air flow. (Refer to ECM motor interface
board section in this manual and Figure #8)
Revised 11-13
DUCT SYSTEM | 7
ELECTRICAL
Always disconnect power to the unit before
servicing to prevent injury or death due to
electrical shock or contact with moving
parts.
All field wiring must comply with local and national
fire, safety and electrical codes. Power to the unit
must be within the operating voltage range
indicated on the unit’s nameplate.
Operating the unit with improper line
voltage or with excessive phase imbalance
is hazardous to the unit and constitutes
abuse and is not covered under warranty.
Properly sized fuses or HACR circuit breakers must
be installed for branch circuit protection. See
equipment rating plates for maximum size.
Both the air handler and condensing units are
provided with a concentric knock-out in the front
right corner post for attaching common trade sizes
of conduit. Route power supply wiring through this
opening. Flexible wiring and conduit should be
used to isolate vibration and noise from the
building structure. Be certain to connect the
ground lead to the ground lug in each of the
control boxes. Connect the power leads as
indicated on the unit wiring diagrams.
Electric Heater Package Option
Factory installed internal electric heater packages
are available for all units. Two circuit breakers are
required when heater packages are utilized. The
circuit breakers for the heater package provide
power for the heater elements, the blower motor
and the control circuit for the unit. The circuit
breaker for the unit provides power for the
compressor. This allows the electric heaters to
continue to operate along with the blower motor in
the case of unit compressor and/or compressor
power supply failure. See HP Series Heater Kit
Instructions for field installation. Each SM Series
model has a number of heater sizes available. Refer
to Figure #7 for heater package compatibility with
specific SM Series units, models nomenclature
and electrical data.
873392084 (2013/11)
8 | Electrical
SM AH Series Heat Pump
Low Voltage Control Wiring
The SM series units incorporate the ECM variable
speed fan motor and control interface board. The
thermostat should be connected to the air
handlers and then from the air handler to the
condensing section. The low voltage power supply
is located in the air handler.
In this application utilize a 9 conductor cable from
the thermostat to the air handler and 7 conductor
cable from the air handler to the condensing
section.
Each model has a number of heater sizes available.
Refer to Figure #7 for heater package compatibility
with specific units, model nomenclature and electrical data
Figure 8: Motor Profile Air Flow Table CFM - Two Stage Units
Model
Fan
Only
Y1 COOL/ Y2 COOL/
HEAT
HEAT
AUX
HEAT
EMERG
HEAT
PLUS
ADJ
MINUS
ADJ
TAP COOL/
HEAT/DELAY
SM024
450
500
800
800
800
900
700
A
SM036
700
1050
1225
1225
1225
1400
1050
A
SM048
900
925
1500
1500
1500
1700
1275
B
SM060
1200
1500
2000
2000
2000
2300
1700
A
SM070
1600
1600
2200
2200
2200
2300
1900
A
Figure 9: Heater Package Compatibility
Model
Heater
Model
KW
Heater Amps
208V
240V
Circuit
MCA
Max. Fuse
208V
240V
208V
240V
AWG
Min.
SM024 thru 070
HP050-1XS
4.8
17.3
20.0
L1/L2
27.1
30.4
30
30
8
SM024 thru 070
HP100-1XS
9.6
34.7
40.0
L1/L2
48.8
55.4
50
60
6
SM036 thru 070
HP100-1XM
9.6
34.7
40.0
L1/L2
49.5
56.3
50
60
6
HP150-1XM
14.4
52.0
60.0
SINGLE
71.2
81.3
80
90
4
HP150-1XM
14.4
34.7
40.0
L1/L2
49.5
56.3
60
60
6
17.3
20.0
L3/L4
21.7
25.0
25
25
10
SM048 thru 070
SM048 thru 070
HP200-1XM
19.2
69.3
80.0
SINGLE
92.9
106.3
100
110
2
HP200-1XM
19.2
34.7
40.0
L1/L2
49.5
56.3
50
60
6
34.7
40.0
L3/L4
43.4
50.0
45
50
6
All heaters rated single phase 60 Hz, and include unit fan load. All fuses type “D” time delay or HACR type breaker or
HRC FORM 1. Wire size based on 60 deg. C copper conductors.
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Electrical | 9
Units supplied with internal electric heat require
two (2) separate power supplies: one for the unit
compressor and one for the electric heater
elements, blower motor and control circuit.
Refer to Figure #7 for wiring instructions,
minimum circuit ampacities and maximum fuse/
breaker sizing.
Electronic Thermostat Installation
Position the thermostat subbase against the wall
so that it is level and the thermostat wires
protrude through the middle of the subbase. Mark
the position of the subbase mounting holes and
drill holes with a 3/16-inch bit. Install supplied
anchors and secure base to the wall. Thermostat
wire must be 8-conductor, 18-AWG wire. Strip the
wires back 1/4-inch (longer strip lengths may
cause shorts) and insert the thermostat wires into
the connector as shown. Tighten the screws to
ensure secure connections. The thermostat has
the same type connectors, requiring the same
wiring. See instructions in the thermostat for
detailed installation and operation information.
When using a 2-cool, 3-heat thermostat both the
W1 & W2 on the Heat Pump and W2 & EM on
the thermostat must be connected together via
a jumper. (See Figure#10)
PACKAGED
HEAT PUMP
THERMOSTAT
R
R
G
Y1
Y1
Y2
Y2
C
G
O
C
B
O
W1
B
W2
E
W2
Figure # 10
Revised 11-13
Packaged heat pumps are equipped with
detachable Thermostat connectors. These
connectors are located in different locations
based on the blower motor that is installed in the
unit.
For the EON motor, the three detachable
thermostat connectors are located on the ECM
Interface board. See Wiring Harness Drawing
on Pg#54.
Harness wiring can be loose, based on the
options installed for the unit. See the Wiring
Harness Drawing notes for further details.
Connection point logic is as follows:
Figure 11: Low Voltage Connection Points
Function
To
From
To Air From Air
Condensing
Thermostat Handler Handler
Section
24 HVAC
Common
C
C
C
C
24 VAC Hot
R
R
R
R
Fan Operation
G
G
Reversing
Valve (3)
O
O
O
O
1st Stage
Compressor
Operation
Y1
Y1
Y1
Y1
2nd Stage
Compressor
Operation
Y2
Y2
Y2
Y2
CS
CS
Condensate
Sensor (1)
Alarm Output
(From UPM)
(2)
L
Splice
Auxilliary
Electric Heat
(4)
W/W1/W2
W1
Emergency
Heat (4)
E
EM/W2
ALR
873392084 (2013/11)
10 | Electrical
1.
2.
3.
4.
SM AH Series Heat Pump
For the condensate overflow sensor, connect ‘CS’ at the
condensing section to ‘CS’ at the air handler. Be sure to ground
power supply.
If service LED is utilized connect ‘ALR’ terminal on the UPM board
to ‘L’ on the thermostat sub base. The wiring may be spliced in the
air handling unit. The ALR output is always dry contact between
the OUT and COM Terminals. See Thermostat connections section
of this manual for additional information.
‘O’ – reversing valve is energized in the cooling mode. Fail safe is
to heating.
Utilized when electric strip heater package present.
If the unit is being connected to a thermostat with
a malfunction light, this connection is made at the
unit alarm output.
If the thermostat is provided with a
malfunction light powered off of the
common (C) side of the transformer, a
jumper between “R” and “COM” terminal of
“ALR” contacts must be made.
ECM Interface Board
If the thermostat is provided with a
malfunction light powered off of the hot (R)
side of the transformer, then the thermostat
malfunction light connection should be
connected directly to the (ALR) contact on
the unit’s UPM board.
To the left of the thermostat connection block are
a row of 2 red and 4 green LED’s. These LED’s
indicate the operating status of the unit. They are
labeled as follows:
Figure # 12
THERMOSTAT CONNECTIONS
Thermostat wiring is connected to the 10 pin
screw type terminal block on the lower center
portion of the ECM Interface Board. In addition to
providing a connecting point for thermostat wiring,
the interface board also translates thermostat
inputs into control commands for the variable
speed programmable ECM DC fan motor and
displays an LED indication of operating status.
The thermostat connections and their functions
are as follows:
Y2
Second Stage Compressor Operation
Y1
First Stage Compressor Operation
G
Fan
O
Reversing Valve (energized in cooling)
W1
Auxiliary Electric Heat
(runs in conjunction with compressor)
EM/W2
Emergency Heat (electric heat only)
NC
Transformer 24 VAC Common
(extra connection)
C1
Transformer 24 VAC Common
(primary connection)
R
Transformer 24 VAC Hot
HUM
Dehumidification Mode
873392084 (2013/11)
EM
RED
Emergency Heat On
W1
RED
Auxiliary Heat On
O
GREEN
Reversing Valve Energized, unit
is in cooling mode
Y2
GREEN
Second Stage Compressor On
Y1
GREEN
First Stage Compressor On
G
GREEN
Fan On
Just above the connector block is a single red LED
labeled CFM that will blink intermittently when the
unit is running and may flicker when the unit is off.
This LED indicates the air delivery of the blower at
any given time. Each blink of the LED represent
100 CFM of air delivery so if the LED blinks 12
times, pauses, blinks 12 times, etc. the blower is
delivering 1200 CFM. Refer to Figure #10 for
factory programmed air delivery settings for the
SM Series.
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Just above and to the right of the thermostat
connection block are four sets of jumper pins
labeled ADJ, DELAY, HEAT and COOL. The ADJ set
of pins are labeled NORM, (+), (-) and TEST. AP
units will all be set on the NORM position from the
factory, however, airflow can be increased (+) or
decreased (-) by 15% from the pre-programmed
setting by relocating the jumper in this section.
The TEST position is used to verify proper motor
operation. If a motor problem is suspected, move
the ADJ jumper to the TEST position and energize
G on the thermostat connection block. If the motor
ramps up to 100% power, then the motor itself is
functioning normally. Always remember to replace
the jumper to NORM, (+) or (-) after testing and
reset the unit thermostat to restore normal
operation.
Do not set the ADJ jumper to the (-) setting when
electric heaters are installed. Doing so may cause
the heaters to cycle on their thermal overload
switches, potentially shortening the life of the
switches.
The other three sets of jumper pins are used to
select the proper program in the ECM motor for
the unit. Refer to Figure #7 for the proper jumper
placement.
To the left of the red and green status LED’s is a
row of 1/4” male quick connects. These are used
to pass thermostat inputs on to the rest of the
control circuit. Remember to always turn off unit
power at the circuit breaker before attaching or
disconnecting any wiring from these connections
to avoid accidental short circuits that can damage
unit control components.
SEQUENCE OF OPERATION
Cooling Mode
See Typical Wiring Diagram at the end of the
manual. Energizing the “O” terminal energizes the
unit reversing valve in the cooling mode. The fan
motor starts when the “G” terminal is energized.
When the thermostat calls for cooling (Y), the loop
pump or solenoid valve if present is energized and
compressor will start.
Once the thermostat is satisfied, the compressor
shuts down accordingly and the fan ramps down to
either fan only mode or off over a span of 30 seconds
(ECM Motors).
Note that a fault condition initiating a lockout will
de-energize the compressor.
Revised 11-13
Sequence of operation | 11
Heating Mode
Heating operates in the same manner as cooling,
but with the reversing valve de-energized. The
compressor will run until the desired setpoint
temperature on the thermostat is achieved.
Once the thermostat is satisfied, the compressor
shuts down and the fan ramps down in either fan
only mode or turns off over a span of 30 seconds.
Auxiliary electric heating coils are not available on
the EP product line.
REFRIGERANT LINES
The installation of the copper refrigerant tubing
must be done with care to obtain reliable, troublefree operation. This installation should only be
performed by qualified refrigeration service and
installation personnel.
Refrigerant lines generally can and should be
routed and supported so as to prevent the
transmission of vibrations into the building
structure. Experience and good design practice
dictate 75 feet as the maximum practical length for
interconnecting refrigerant lines in split system
heat pumps without special considerations.
Beyond 75 feet, system losses become substantial
and the total refrigerant charge required can
compromise the reliability and design life of the
equipment.
Refrigerant lines should be sized in accordance
with Figure #13 in the following instructions.
Copper tubing should be clean and free of
moisture and dirt or debris. The suction and liquid
lines MUST be insulated with at least 3/8” wall,
closed-cell foam rubber insulation or the
equivalent.
Some points to consider are:
• Pressure drop (friction losses) in refrigerant
suction lines reduces system capacity and
increases power consumption by as much as
2% or more, depending on the line length,
number of bends, etc. Pressure drop in liquid
lines affects system performance to a lesser
degree, provided that a solid column of liquid
(no flash gas) is being delivered to the
refrigerant metering device, and that the liquid
pressure at the refrigerant metering device is
sufficient to produce the required refrigerant
flow.
873392084 (2013/11)
12 | Refrigerant Lines
•
•
•
SM AH Series Heat Pump
Oil is continually being circulated with the
refrigerant so, oil return to the compressor is
always a consideration in line sizing. Suction
lines on split system heat pumps are also hot
gas lines in the heating mode, but are treated
as suction lines for sizing purposes. If the
recommended suction lines sizes are used,
there should be no problem with oil return.
Vertical lines should be kept to a minimum.
Vertical liquid lines will have a vertical liquid lift
in either heating or cooling, and the weight of
the liquid head is added to the friction loss to
arrive at the total line pressure drop.
Wherever possible, the air handler should be
installed at a higher elevation than the
condensing section to aid with oil return to the
compressor.
Linear vs Equivalent Line Length
Linear Line Length - is the actual measured length
of the line including bends. This issued to calculate
the additional refrigerant charge thatm ust be
added to the system. (See Figure #15 and
examples)
Equivalent Line Length - is the combination of the
actual length of all the straight runs and the
equivalent length of all bends valves and fittings in
a particular line. The equivalent length of a bend,
valve or fitting is equal to the length of a straight
tube of the same diameter having the same
pressure drop as the particular valve or fitting. The
ASHRAE Fundamentals Handbook provides tables
for determining the equivalent length of various
bends, valves and fittings. Liquid and suction line
sizes as shown in Figure #14 are based on
Equivalent Line Length.
•
•
•
Connect and braze lines to service valves on
the condensing section.
WARNING: Always wrap the body of the
service valve with a wet towel or apply some
other form of heatsink prior to brazing and
direct flame away from the valve body.
Failure to do so will result in damage to the
valve. Valve bpdy temperature must remain
below 250°F to protect the internal rubber “O”
rings and seals.
Figure 13: Valve Sizing Chart
Line
Type
Valve
Conn.
Size
Allen
Wrench
size
SM024/036
Suction
3/4
5/16
SM048/060/070
Suction
7/8
5/16
Liquid
3/8
3/16
Unit Size
All Valves
Valve
top
Schraeder
Port
Figure # 14
Connecting Refrigerant Lines
•
•
Use only ACR grade copper tubing and keep
ends sealed until joints are made.
For best performance, select routing of
refrigerant lines for minimum distance and
fewest number of bends.
Size lines in accordance with Figure #15.
Cut crimped ends off the air handler suction
and liquid lines. Connect and braze lines to the
air handler.
Pressurize the refrigerant line set and air handler
to 150lbs with dry nitrogen through the Schraeder
ports provided on the self service valves. Check
line set and unit connections for leaks.
Once system integrity is verified, evacuate line set
and air handler with a good vacuum pump to 500
microns and hold for half hour.
Pump down must never be used with heat
pumps.
The air handler is factory supplied with a holding
charge of dry nitrogen.
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Charging the system | 13
CHARGING THE SYSTEM
•
Do not overcharge the system. Charge all systems
by weight as determined from Figure #15 and the
supplied factory charge. Remember the
condensing unit is factory charged with sufficient
refrigerant to support the air handler, condensing
section and 25 feet of liquid line. If the lines are
less orm ore than 25 feet, then a charge
adjustment must be calculated. Refer to examples
#1 and #2 in Figure #15..
DANGER: High pressure refrigerant gas and
liquid is present in the unit. Liquid
refrigerant can cause severe burns to
exposed skin areas. Wear safety glasses to
protect the eyese. Liquid refrigerant in
contact with the eyes could cause loss of
sight.
If the calculated Equivalent Line Length falls
between the lengths shown on Table 3, use
tubing sized for the next longer length.
Maximum Linear (actual) liquid line length
without a suction line accumulator is 60 feet.
Liquid line length in excess of 100 feet is not
recommended either with or without a suction
line accumulator.
A liquid line drier-filter is required, it must be
of the bidirectional type only and approved for
the refrigerant type utilized.
Suction line size must be one of those given in
Figure #15.
Horizontal suction line runs should be pitched
slightly toward the compressor to provide free
drainage and aid oil return. Do not exceed the
largest diameter given in the tables on
horizontal runs.
When brazing always bleed dry nitrogen
through refrigerant tubing to displace air and
prevent oxidation.
Air handler is pre-charged in the factory with
nitrogen gas. Cut air handler piping with care.
•
•
•
•
Open both service valves in the condensing section
by turning the valve stops located at the top of
each valve counter-clockwise with an Allen
wrench. Make sure that both valves are fully open.
THINGS TO REMEMBER:
• Do not oversize liquid lines unless absolutely
unavoidable. If oversized lines must be used, a
suction line accumulator may be required and
the addition of a crankcase heater may be
necessary. Consult the Factory for
recommendation.
•
•
DANGER: Always check refrigerant type on
the unit data plate before servicing. Do not
use R-22 manifold gauges on R-410A units.
Doing so could result in severe injury.
Figure 15: Refrigerant Charge, Line Sizing and Capacity Multiplier Chart
SYSTEM
MODEL
Factory
R410A
Charge
(Oz)*
Refrigerant Line O.D. Size (Based on Equivalent Line Length)
25 FT.
35 FT.
45 FT.
50 FT.
Suct. Line
Riser Max.
75 FT
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
LIQ.
SUC.
SM024
80
3/8
3/4
3/8
3/4
3/8
3/4
3/8
3/4
3/8
7/8
3/4
SM036
86
3/8
3/4
3/8
3/4
3/8
3/4
3/8
7/8
3/8
7/8
3/4
SM048
88
3/8
7/8
3/8
7/8
3/8
7/8
3/8
7/8
3/8
7/8
7/8
SM060
115
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
7/8
SM070
127
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
3/8
1-1/8
7/8
CAPACITY MULTIPLIER
1.00
.995
Example 1:
Model SM036 with 45ft of equivalent length of 3/8” O.D Liquid
Line. Total system charge= Factory charge + (45ft - 25 ft) x .60
oz/ft Total System Charge = 93 oz + (20ft x .60 oz/ft) = 105 oz.
Additional 12 oz of R410A refrigerant required.
Revised 11-13
0.990
0.990
0.980
Example 2:
Model SM060 with 10ft of equivalent length of 3/8” O.D
Liquid Line. Total system charge= Factory charge + (25ft 10ft) x .60 oz/ft Total System Charge = 150 oz + (15ft x .60
oz/ft) = 141 oz. Additional 12 oz of R410A refrigerant
required.
873392084 (2013/11)
14 | SYSTEM CHECKOUT
SM AH Series Heat Pump
SYSTEM CHECKOUT
INITIAL START-UP
After completing the installation, and before
energizing the unit, the following system checks
should be made:
• Verify that the supply voltage to the heat pump
is in accordance with the nameplate ratings.
• Make sure that all electrical connections are
tight and secure.
• Check the electrical fusing and wiring for the
correct size.
• Verify that the low voltage wiring between the
thermostat and the unit is correct.
• Verify that the water piping is complete and
correct.
• Check that the water flow is correct, and
adjust if necessary.
• Check the blower for free rotation, and that it
is secured to the shaft.
• Verify that vibration isolation has been
provided.
• Unit is serviceable. Be certain that all access
panels are secured in place.
1. Make sure all valves in heat recovery water
piping system are open. NEVER OPERATE HR
PUMP DRY.
2. Turn on the heat pump. The HR pump should
not run if the compressor is not running.
3. turn the HR switch to the “ON” position. The
pump wil operate if entering water
temperature to HR is below 120° F.
4. The temperature difference between the water
entering and leaving the heat recovery should
be 5° to 15° F.
UNIT START-UP
1. Set the thermostat to the highest setting.
2. Set the thermostat system switch to "COOL",
and the fan switch to the "AUTO" position. The
reversing valve solenoid should energize. The
compressor and fan should not run.
3. Reduce the thermostat setting approximately 5
degrees below the room temperature.
4. Verify the heat pump is operating in the cooling
mode.
5. Turn the thermostat system switch to the
"OFF" position. The unit should stop running
and the reversing valve should deenergize.
6. Leave the unit off for approximately (5)
minutes to allow for system equalization.
7. Turn the thermostat to the lowest setting.Set
the thermostat switch to "HEAT".
8. Increase the thermostat setting approximately
5 degrees above the room temperature.
9. Verify the heat pump is operating in the heating
mode.
10. Set the thermostat to maintain the desired
space temperature.
11. Check for vibrations, leaks, etc...
873392084 (2013/11)
MAINTENANCE
1. Filter changes or cleanings are required at
regular intervals. The time period between
filter changes will depend upon type of
environment the equipment is used in. In a
single family home, that is not under
construction, changing or cleaning the filter
every 60 days is sufficient. In other
applications such as motels, where daily
vacuuming produces a large amount of lint,
filter changes may be need to be as frequent as
biweekly.
WARNING: Equipment should never be
used during construction due to likelihood
of wall board dust accumulation in the air
coil of the equipment which permanently
affects the performance and may shorten
the life of the equipment.
2. An annual “checkup” is recommended by a
licensed refrigeration mechanic. Recording the
performance measurements of volts, amps,
and water temperature differences (both
heating and cooling) is recommended. This
data should be compared to the information on
the unit’s data plate and the data taken at the
original startup of the equipment.
3. Lubrication of the blower motor is not
required, however may be performed on some
motors to extend motor life. Use SAE-20 nondetergent electric motor oil.
4. The condensate drain should be checked
annually by cleaning and flushing to insure
proper drainage.
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
| 15
5. Periodic lockouts almost always are caused by
air or water flow problems. The lockout
(shutdown) of the unit is a normal protective
measure in the design of the equipment. If
continual lockouts occur call a mechanic
immediately and have them check for: water
flow problems, water temperature problems,
air flow problems or air temperature problems.
Use of the pressure and temperature charts for
the unit may be required to properly determine
the cause.
Revised 11-13
873392084 (2013/11)
16 | Operating Pressures & Temperatures
SM AH Series Heat Pump
OPERATING PRESSURES &
TEMPERATURES
Operating Temperatures and Pressures
COOLING
Model
Entering
Water
Temp. F
30°
40°
50°
SM024
Part
Load
60°
70°
80°
90°
100°
30°
40°
50°
SM024
Full
Load
60°
70°
80°
90°
100°
Wat
er
Flow
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
HEATING
Water
Temp
Rise °F
Air
Temp
Drop °F
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Water
Temp
Drop
Air
Temp
Rise °F
4
75-91
264-322
5-6
15-17
8
79-96
270-331
3-4
16-18
4
88-107
277-339
6-7
17-20
8
115-140
175-214
8-9
19-23
92-112
284-348
4-5
18-21
4
129-157
218-267
14-17
18-20
98-122
291-356
7-8
20-23
8
124-151
204-250
8-9
19-22
110-130
298-364
5-6
21-24
4
134-163
249-305
13-16
17-20
112-136
304-372
8-10
22-26
8
128-156
233-287
8-9
18-21
117-143
312-381
6-7
23-28
4
138-168
281-341
13-16
17-19
124-152
318-389
9-11
24-29
8
133-161
263-323
7-9
18-21
131-159
325-398
6-8
26-31
4
143-174
317-388
13-16
16-19
136-166
331-405
11-13
27-32
8
137-167
297-366
7-9
17-20
143-174
339-415
7-9
28-33
4
147-179
357-437
13-16
16-18
149-181
345-422
12-14
29-35
8
141-172
335-411
7-9
17-20
156-190
352-432
8-10
31-37
4
151-185
402-492
13-15
15-18
8
146-177
378-459
7-9
16-19
4
76-92
242-297
3-4
13-14
8
80-97
249-304
2-3
13-15
89-108
255-312
4-5
15-17
4
125-151
180-221
14-18
19-22
8
120-146
4
134-163
169-207
8-10
20-23
93-113
261-320
3-3
16-18
211-258
14-18
18-21
106-118
267-327
5-6
8
17-19
129-157
198-242
8-10
19-23
110-126
274-335
3-4
18-21
4
139-169
241-295
14-17
18-21
113-138
280-342
6-7
19-22
8
134-163
227-278
8-10
19-22
119-145
287-351
4-5
20-23
4
144-175
272-333
14-17
17-20
126-155
292-358
7-8
21-24
8
138-168
255-313
8-10
18-21
133-162
300-367
5-6
22-26
4
148-181
307-375
14-17
17-19
138-168
305-373
8-9
23-27
8
143-174
288-353
8-10
18-21
145-177
312-382
5-6
24-29
4
153-186
346-423
14-17
16-19
151-184
317-388
8-10
25-29
8
147-179
325-398
8-9
17-20
158-193
325-398
6-7
26-31
4
158-191
389-477
13-16
16-18
8
152-185
366-448
8-9
17-20
This chart shows approximate temperatures and pressures for a unit in good repair. The values shown are meant as
a guide only and should not be used to estimate system charge. This chart assumes rated air flow and 80º d.b./67º
w.b. entering air temperature in cooling, 70º d.b. entering air temperature in heating. Heating data at entering fluid
temperatures below 50º assumes the use of antifreeze. As a result of continuing research and development,
specifications are subject to change without notice.
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Operating Pressures & Temperatures | 17
Operating Temperatures and Pressures
COOLING
HEATING
4.5
30°
40°
50°
SM036
Part
Load
60°
70°
80°
90°
100°
9.0
40°
50°
SM036
Full
Load
60°
70°
80°
90°
100°
266-325
5-6
15-18
77-94
272-333
3-4
16-19
4.5
117-143
189-231
14-17
18-22
86-105
279-341
6-7
17-21
9.0
112-137
178-217
8-9
19-24
90-110
286-350
4-5
18-22
4.5
126-154
221-270
14-17
18-21
105-125
293-358
7-8
20-24
9.0
121-148
207-253
8-9
19-23
109-130
300-366
5-6
21-25
4.5
131-160
252-308
13-16
17-21
110-134
306-374
8-10
22-27
9.0
125-153
237-290
8-9
18-22
115-141
314-383
6-7
23-29
4.5
135-165
284-347
13-16
17-20
122-150
320-391
9-11
24-30
9.0
130-158
266-326
7-9
18-22
129-157
327-400
6-8
26-32
4.5
140-171
320-391
13-16
16-20
134-164
333-407
11-13
27-33
9.0
134-164
300-367
7-9
17-21
141-172
341-417
7-9
28-35
4.5
144-176
360-440
13-16
16-19
147-179
347-424
12-14
29-36
9.0
138-169
338-414
7-9
17-21
154-188
355-434
8-10
31-38
4.5
149-182
405-495
13-15
15-19
9.0
143-174
381-465
7-9
16-20
74-90
244-299
3-4
13-15
4.5
30°
73-89
9.0
78-95
251-306
2-3
13-16
4.5
122-149
183-224
14-18
19-23
87-106
257-314
4-5
15-18
9.0
117-143
172-210
8-10
20-24
91-111
263-322
3-3
16-19
4.5
131-160
214-261
14-18
18-22
95-105
269-329
5-6
17-20
9.0
126-154
201-245
8-10
19-24
100-125
276-337
3-4
18-22
4.5
136-166
244-298
14-17
18-22
111-136
282-344
6-7
19-23
9.0
131-160
230-281
8-10
19-23
117-143
289-353
4-5
20-24
4.5
141-172
275-336
14-17
17-21
124-152
294-360
7-8
21-25
9.0
135-165
258-316
8-10
18-22
131-160
302-369
5-6
22-27
4.5
145-178
310-378
14-17
17-20
136-166
307-375
8-9
23-28
9.0
140-171
291-356
8-10
18-22
143-175
314-384
5-6
24-30
4.5
150-183
349-426
14-17
16-20
149-182
319-390
8-10
25-30
9.0
144-176
328-401
8-9
17-21
156-191
327-400
6-7
26-32
4.5
155-189
392-480
13-16
16-19
9.0
149-182
369-451
8-9
17-21
This chart shows approximate temperatures and pressures for a unit in good repair. The values shown are meant as
a guide only and should not be used to estimate system charge. This chart assumes rated air flow and 80º d.b./67º
w.b. entering air temperature in cooling, 70º d.b. entering air temperature in heating. Heating data at entering fluid
temperatures below 50º assumes the use of antifreeze. As a result of continuing research and development,
specifications are subject to change without notice.
Revised 11-13
873392084 (2013/11)
18 | Operating Pressures & Temperatures
SM AH Series Heat Pump
Operating Temperatures and Pressures
COOLING
HEATING
6.0
30°
40°
50°
SM048
Part
Load
60°
70°
80°
90°
100°
12.0
40°
50°
SM048
Full
Load
60°
70°
80°
90°
100°
248-303
5-6
15-18
67-82
254-311
3-4
16-19
6.0
109-134
183-224
18-22
19-23
75-91
261-319
6-8
17-21
12.0
105-128
172-210
10-12
20-25
79-96
267-327
4-5
18-23
6.0
118-144
214-261
18-22
19-23
78-90
273-334
8-10
20-24
12.0
113-138
201-245
10-12
20-24
82-95
280-342
5-7
21-26
6.0
122-149
244-298
17-21
18-22
96-117
286-349
9-11
22-27
12.0
117-143
230-281
10-12
19-24
101-123
293-358
6-8
24-29
6.0
126-154
275-336
17-21
18-22
107-131
299-365
11-13
25-30
12.0
121-148
258-316
10-12
19-23
113-138
306-374
7-9
26-32
6.0
130-159
310-378
17-21
17-21
117-143
311-380
12-15
27-33
12.0
132-153
291-356
10-12
18-22
123-151
319-390
8-10
29-35
6.0
134-164
349-426
17-20
17-20
128-157
324-396
13-16
29-36
12.0
129-158
328-401
9-12
18-22
135-165
332-406
9-11
31-38
6.0
139-170
392-480
16-20
16-20
12.0
133-163
369-451
9-11
17-21
71-87
277-339
6-7
15-19
6.0
30°
64-78
12.0
75-92
284-347
4-5
16-20
6.0
118-144
194-237
21-25
19-23
84-102
291-356
7-9
18-22
12.0
113-138
182-223
12-14
20-24
88-108
299-365
5-6
19-23
6.0
127-155
226-276
21-25
18-22
92-110
305-373
9-11
20-25
12.0
122-149
213-260
12-14
19-24
98-120
313-383
6-7
21-26
6.0
131-160
259-316
21-25
18-22
108-132
320-391
10-13
23-28
12.0
126-154
243-297
12-14
19-23
113-138
328-400
7-9
24-29
6.0
136-166
291-355
20-25
17-21
120-147
334-408
12-15
25-31
12.0
130-159
273-334
12-14
18-22
126-154
342-418
8-10
27-32
6.0
140-171
328-401
20-24
17-20
131-161
348-425
14-17
27-34
12.0
135-165
308-377
11-14
18-22
138-169
356-436
9-11
29-36
6.0
145-177
369-451
20-24
16-20
144-176
362-442
15-18
30-37
12.0
139-170
347-424
11-14
17-21
151-185
371-453
10-12
32-39
6.0
149-183
415-508
19-24
16-19
12.0
143-175
391-477
11-14
17-21
This chart shows approximate temperatures and pressures for a unit in good repair. The values shown are meant as
a guide only and should not be used to estimate system charge. This chart assumes rated air flow and 80º d.b./67º
w.b. entering air temperature in cooling, 70º d.b. entering air temperature in heating. Heating data at entering fluid
temperatures below 50º assumes the use of antifreeze. As a result of continuing research and development,
specifications are subject to change without notice.
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Operating Pressures & Temperatures | 19
Operating Temperatures and Pressures
COOLING
HEATING
7.0
30°
40°
50°
SM060
Part
Load
60°
70°
80°
90°
100°
14.0
40°
50°
SM060
Full
Load
60°
70°
80°
90°
100°
256-313
5-7
19-23
73-89
261-319
4-5
20-25
7.0
113-138
172-210
18-22
19-23
81-99
277-339
7-8
22-26
14.0
110-134
161-196
12-14
20-24
86-105
283-346
5-6
23-28
7.0
116-142
206-252
17-21
19-23
93-114
299-365
8-9
24-29
14.0
112-137
193-236
12-14
19-24
99-121
305-373
6-7
25-31
7.0
118-145
241-294
17-21
18-23
106-129
321-392
9-11
26-32
14.0
115-140
225-275
11-14
19-23
113-138
327-400
7-8
28-34
7.0
121-148
275-336
17-21
18-22
118-145
342-418
10-12
29-35
14.0
117-143
257-314
11-14
19-23
126-154
349-427
8-9
30-37
7.0
123-151
309-378
16-20
18-22
131-160
364-444
11-14
31-38
14.0
120-146
289-353
11-13
19-23
139-170
371-454
8-10
33-40
7.0
126-154
344-420
16-20
18-22
143-175
385-471
12-15
33-41
14.0
122-149
321-392
11-13
18-22
152-186
393-480
9-11
35-43
7.0
128-157
378-462
16-19
17-21
14.0
125-152
353-432
11-13
18-22
68-84
256-313
5-7
19-23
7.0
30°
68-84
14.0
73-89
261-319
4-5
20-25
7.0
117-143
182-222
15-19
21-26
81-99
277-339
7-8
22-26
14.0
114-139
170-208
11-14
22-27
86-105
283-346
5-6
23-28
7.0
120-147
215-263
15-18
20-25
93-114
299-365
8-9
24-29
14.0
117-143
201-246
11-14
21-26
99-121
305-373
6-7
25-31
7.0
123-150
248-304
14-17
20-24
106-129
321-392
9-11
26-32
14.0
119-146
232-284
11-13
21-25
113-138
327-400
7-8
28-34
7.0
126-154
282-344
14-17
19-24
118-145
342-418
10-12
29-35
14.0
122-149
263-322
10-13
20-25
126-154
349-427
8-9
30-37
7.0
129-157
315-385
13-16
19-23
131-160
364-444
11-14
31-38
14.0
125-153
294-360
10-12
19-24
139-170
371-454
8-10
33-40
7.0
132-161
348-426
13-16
18-22
143-175
385-471
12-15
33-41
14.0
128-156
326-398
10-12
19-23
152-186
393-480
9-11
35-43
7.0
134-164
382-466
12-15
17-21
14.0
131-160
357-436
9-11
18-22
This chart shows approximate temperatures and pressures for a unit in good repair. The values shown are meant as
a guide only and should not be used to estimate system charge. This chart assumes rated air flow and 80º d.b./67º
w.b. entering air temperature in cooling, 70º d.b. entering air temperature in heating. Heating data at entering fluid
temperatures below 50º assumes the use of antifreeze. As a result of continuing research and development,
specifications are subject to change without notice.
Revised 11-13
873392084 (2013/11)
20 | Operating Pressures & Temperatures
SM AH Series Heat Pump
Operating Temperatures and Pressures
COOLING
HEATING
9.0
30°
40°
50°
SM070
Part
Load
60°
70°
80°
90°
100°
18.0
40°
50°
SM070
Full
Load
60°
70°
80°
90°
100°
259-316
5-7
19-23
76-92
264-322
4-5
20-25
9.0
116-141
175-213
18-22
19-23
84-102
280-342
7-8
22-26
18.0
113-137
164-199
12-14
20-24
89-108
286-349
5-6
23-28
9.0
119-145
209-255
17-21
19-23
96-117
302-368
8-9
24-29
18.0
115-140
196-239
12-14
19-24
102-124
308-376
6-7
25-31
9.0
121-148
244-297
17-21
18-23
109-132
324-395
9-11
26-32
18.0
118-143
228-278
11-14
19-23
116-141
330-403
7-8
28-34
9.0
124-151
278-339
17-21
18-22
121-148
345-421
10-12
29-35
18.0
120-146
260-317
11-14
19-23
129-157
352-430
8-9
30-37
9.0
126-154
312-381
16-20
18-22
134-163
367-447
11-14
31-38
18.0
123-149
292-356
11-13
19-23
142-173
374-457
8-10
33-40
9.0
129-157
347-423
16-20
18-22
146-178
388-474
12-15
33-41
18.0
125-152
324-395
11-13
18-22
155-189
396-483
9-11
35-43
9.0
131-160
381-465
16-19
17-21
18.0
128-155
356-435
11-13
18-22
71-87
259-316
5-7
19-23
9.0
30°
71-87
18.0
76-92
264-322
4-5
20-25
9.0
120-146
185-225
15-19
21-26
84-102
280-342
7-8
22-26
18.0
117-142
173-211
11-14
22-27
89-108
286-349
5-6
23-28
9.0
123-150
218-266
15-18
20-25
96-117
302-368
8-9
24-29
18.0
120-146
204-249
11-14
21-26
102-124
308-376
6-7
25-31
9.0
126-153
251-307
14-17
20-24
109-132
324-395
9-11
26-32
18.0
122-149
235-287
11-13
21-25
116-141
330-403
7-8
28-34
9.0
129-157
285-347
14-17
19-24
121-148
345-421
10-12
29-35
18.0
125-152
266-325
10-13
20-25
129-157
352-430
8-9
30-37
9.0
132-160
318-388
13-16
19-23
134-163
367-447
11-14
31-38
18.0
128-156
297-363
10-12
19-24
142-173
374-457
8-10
33-40
9.0
135-164
351-429
13-16
18-22
146-178
388-474
12-15
33-41
18.0
131-159
329-401
10-12
19-23
155-189
396-483
9-11
35-43
9.0
137-167
385-469
12-15
17-21
18.0
134-163
360-439
9-11
18-22
This chart shows approximate temperatures and pressures for a unit in good repair. The values shown are meant as
a guide only and should not be used to estimate system charge. This chart assumes rated air flow and 80º d.b./67º
w.b. entering air temperature in cooling, 70º d.b. entering air temperature in heating. Heating data at entering fluid
temperatures below 50º assumes the use of antifreeze. As a result of continuing research and development,
specifications are subject to change without notice.
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Unit Checkout Sheet | 21
UNIT CHECKOUT SHEET
Customer Data
Customer Name _____________________________________________
Address ______________________________________________________
_______________________________________________________________
Phone _______________________________________________________
Date ___________________________________
Unit Number ___________________________
Unit Nameplate Data
Unit Make _________________________________________
Model Number ____________________________________
Serial Number ____________________________________
Refrigerant Charge (oz) __________________________
Compressor: RLA ____________________
LRA ___________________________
Blower Motor: FLA (or NPA) ___________
HP ____________________________
Maximum Fuse Size (Amps) ____________
Maximum Circuit Ampacity _____________
Operating Conditions
Entering / Leaving Air Temp
Cooling Mode
_______________ / _____________
Heating Mode
_______________ / _____________
Entering Air Measured at:
______________________________
______________________________
Leaving Air Measured at:
______________________________
______________________________
Entering / Leaving Fluid Temp
_______________ / _____________
_______________ / _____________
Fluid Flow (gpm)
______________________________
______________________________
Compressor Volts / Amps
_______________ / _____________
_______________ / _____________
Blower Motor Volts / Amps
_______________ / _____________
_______________ / _____________
Source Fluid Type
______________________________
______________________________
Fluid Flow (gpm)*
______________________________
______________________________
Fluid Side Pressure Drop*
______________________________
______________________________
Suction / Discharge Pressure (psig)*
Suction / Discharge Temp*
Suction Superheat*
Entering TXV / Cap Tube Temp*
_______________ / _____________
_______________ / _____________
_______________ / _____________
______________________________
______________________________
______________________________
_______________ / _____________
______________________________
______________________________
______________________________
Liquid Subcooling*
* Required for Troubleshooting ONLY
Auxiliary Heat
Unit Make __________________________________
Model Number: ______________________________
Max Fuse Size (Amps) _______________________
Serial Number _____________________________
Volts / Amps _______________________________
Entering Air Temperature _____________________
Leaving Air Temperature ______________________
MAIL TO: Bosch.Fhp.TechSupport@us.bosch.com
or scan the QR code and attach picture of this form with
Bosch Group
601 NW 65th Court
Fort Lauderdale, FL 33309
Phone: (866) 642-3198
Fax: (800) 776-5529
the information requested.
Revised 11-13
873392084 (2013/11)
22 | Troubleshooting
SM AH Series Heat Pump
TROUBLESHOOTING
Unit Troubleshooting
Problem
ENTIRE UNIT
DOES NOT RUN
UNIT OFF ON
HIGH PRESSURE
CONTROL
UNIT OFF ON
LOW PRESSURE
CONTROL
UNIT SHORT
CYCLES
873392084 (2013/11)
Possible Cause
Checks and Correction
Power Supply Off
Apply power, close disconnect
Blown Fuse
Replace fuse or reset circuit breaker. Check for correct fuses
Voltage Supply
Low
If voltage is below minimum voltage specified on unit data plate,
contact local power company.
Thermostat
Set the fan to "ON", the fan should run. Set thermostat to "COOL" and
lowest temperature setting, the unit should run in the cooling mode
(reversing valve energized). Set unit to "HEAT" and the highest
temperature setting, the unit should run in the heating mode. If neither
the blower or compressor run in all three cases, the thermostat could
be miswired or faulty.To ensure miswired or faulty thermostat verify 24
volts is available on the condensing section low voltage terminal strip
between "R" and "C", "Y" and "C", and "O" and "C". If the blower does
not operate, verify 24 volts between terminals "G" and "C" in the air
handler. Replace the thermostat if defective.
Discharge
pressure too high
In “COOLING” mode: Lack of or inadequate water flow. Entering water
temperature is too warm. Scaled or plugged condenser. In “HEATING”
mode: Lack of or inadequate air flow. Blower inoperative, clogged filter
or restrictions in duct work
Refrigerant
charge
The unit is overcharged with refrigerant. Reclaim refrigerant, evacuate
and recharge with factor recommended charge.
High pressure
Check for defective or improperly calibrated high pressure switch.
Suction pressure
too low
In “COOLING” mode: Lack of or inadequate air flow. Entering air
temperature is too cold. Blower inoperative, clogged filter or
restrictions in duct work. In “HEATING” mode: Lack of or inadequate
water flow. Entering water temperature is too cold. Scaled or plugged
condenser.
Refrigerant
charge
The unit is low on refrigerant. Check for refrigerant leak, repair,
evacuate and recharge with factory recommended charge.
Low pressure
switch
Check for defective or improperly calibrated low pressure switch.
Unit oversized
Recalculate heating and or cooling loads.
Thermostat
Thermostat installed near a supply air grill; relocate thermostat.
Readjust heat anticipator.
Wiring and
controls
Check for defective or improperly calibrated low pressure switch.
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Troubleshooting | 23
Unit Troubleshooting
Problem
INSUFFICIENT
COOLING OR
HEATING
BLOWER
OPERATES
BUT
COMPRESSOR
DOES NOT
Revised 11-13
Possible Cause
Checks and Correction
Unit undersized
Recalculate heating and or cooling loads. If excessive, possibly adding
insulation and shading will rectify the problem
Loss of
conditioned air by
leakage
Check for leaks in duct work or introduction of ambient air through
doors or windows
Airflow
Lack of adequate air flow or improper distribution of air. Replace dirty
filter
Refrigerant
charge
Low on refrigerant charge causing inefficient operation
Compressor
Check for defective compressor. If discharge is too low and suction
pressure is too high, compressor is not pumping properly. Replace
compressor.
Reversing Valve
Defective reversing valve creating bypass of refrigerant from discharge
of suction side of compressor. Replace reversing valve
Operating
pressures
Compare unit operation pressures to the pressure/temperature chart
for the unit.
TXV
Check TXV for possible restriction or defect. Replace if necessary.
Moisture,
noncondensables
The refrigerant system may be contaminated with moisture or
noncondensables. Reclaim refrigerant, replace filter dryer, evacuate the
refrigerant system, and recharge with factory recommended charge.
Thermostat
Check setting, calibration, and wiring.
Wiring
Check for loose or broken wires at compressor, capacitor, or contactor.
Safety Controls
Check UPM board red default L.E.D. for Blink Code
Compressor
overload open
If the compressor is cool and the overload will not reset, replace
compressor.
Compressor
motor grounded
Internal winding grounded to the compressor shell. Replace
compressor. If compressor burnout, install suction filter dryer.
Compressor
windings open
After compressor has cooled, check continuity of the compressor
windings. If the windings are open, replace the compressor.
873392084 (2013/11)
24 | Wiring Diagrams
SM AH Series Heat Pump
WIRING DIAGRAMS
Figure # 16 SM - No Electric Heat Kit
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Wiring Diagrams | 25
Figure # 17 SM- With Electric Heat Kit
Revised 11-13
873392084 (2013/11)
26 | Dimensional drawings
SM AH Series Heat Pump
DIMENSIONAL DRAWINGS
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Revised 11-13
Dimensional drawings | 27
873392084 (2013/11)
28 | Notes
SM AH Series Heat Pump
NOTES
873392084 (2013/11)
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Revised 11-13
Notes | 29
873392084 (2013/11)
30 | Notes
873392084 (2013/11)
SM AH Series Heat Pump
Subject to change without prior notice
SM AH Series Heat Pump
SM AH Series Heat
Revised 11-13
Notes | 31
873392084 (2013/11)
601 N.W. 65th Court, Ft. Lauderdale, FL 33309
Phone: 866-642-3198 | Fax: 954-776-5529
www.boschtaxcredit.com | www.bosch-climate.us
Revised 11-13