Maritime Geothermal ATF-45 Manual

1-Jun-2018 Page 1 002000MAN-01
Maritime Geothermal Ltd.
P.O. Box 2555, 170 Plantation Road
Petitcodiac, NB E4Z 6H4
[phone]
ATF-Series
Air Source Triple Function Heat Pump
Two-stage R410a 60Hz
Model Sizes 45-75
[email protected]
www.nordicghp.com
002000MAN-01
1-June-2018
Installation and Service Manual

Page 2 002000MAN-01 1-Jun-2018
ACE—65—P—1/6—KDE—xx
WARNING: Ensure all access panels are in place and properly secured before applying power to the unit.
Failure to do so may cause electrical shock.
WARNING: Before performing service or maintenance on the system, ensure all power sources
are DISCONNECTED. Electrical shock can cause serious personal injury or death.
WARNING: Refrigeration systems contain refrigerant under high pressure and as such can be hazardous
to work on. Only qualified service personnel should install, repair, or service the heat pump.
CAUTION: Safety glasses and work gloves should be worn at all times whenever the system is serviced.
A fire extinguisher and proper ventilation should be present whenever brazing is performed.
CAUTION: Venting refrigerant to atmosphere is illegal. A proper refrigerant recovery system must be
employed whenever repairs require removal of refrigerant from the equipment.
SAFETY PRECAUTIONS
Model Nomenclature
Series:
ACE = All weather Condenser / Evaporator
(air source outdoor unit)
Nominal Size:
45 = for AT_-45
55 = for AT_-55
65 = for AT_-65
75 = for AT_-75
Voltage Code:
1/6 = 220~277-1-50/60
Air Coil:
S = Standard
K = Coated
Blower Type:
D = Direct Drive
Blower Motor:
E = ECM (Variable Speed)
Revision:
01, 02 etc.
ATF—65—HACW—P—1T—C—SDELF—xx
Series:
ATF = Air to Triple Function
Nominal Size:
45 = 030 compressor
55 = 040 compressor
65 = 051 compressor
75 = 060 compressor
Functions:
H = Heating
AC = Active Cooling
W = Domestic Hot Water
Refrigerant:
P = R410a
Voltage Code:
1 = 230-1-60
2 = 208-3-60
4 = 460-3-60
6 = 220-1-50
7 = 380-3-50
Compressor:
S = 1 Stage Scroll
T = 2 Stage Scroll
Hydronic Coil:
C = Copper
Y = CuNi coil & piping
Z = CuNi coil only
Air Coil:
S = Standard
K = Coated
Blower Type:
D = Direct Drive
Blower Motor:
E = ECM (Variable Speed)
Air Return Orientation:
L = Left Return
R = Right Return
Air Outlet Orientation:
F = Field Configurable
(top or side)
Revision:
01, 02 etc.

1-Jun-2018 Page 3 002000MAN-01
Maritime Geothermal Ltd. has a continuous improvement policy and reserves the right to modify specification
data at any time without prior notice .
APPLICATION TABLE - INDOOR UNIT
MODEL REFRIGERANT VOLTAGE COMPRESSOR HYDRONIC
COIL
AIR COIL/
BLOWER/AIR
RETURN
AIR
RETURN REVISIONS
ATF-45 P
1
2
4
T
C
Y
Z
S D E L
R 02
ATF-55 P
1
2
4
T
C
Y
Z
S D E L
R 02
ATF-65 P
1
2
4
T
C
Y
Z
S D E L
R 02
ATF-75 P
1
2
4
T
C
Y
Z
S D E L
R 02
This manual applies only to the models and revisions listed in this table.
FUNCTION
H A C W
H A C W
H A C W
H A C W
AIR
OUTLET
F
F
F
F
APPLICATION TABLE - OUTDOOR UNIT
MODEL REFRIGERANT VOLTAGE AIR COIL BLOWER TYPE BLOWER MOTOR REVISIONS
ACE-45 P 1/6 S
K D E 03
ACE-55 P 1/6 S
K D E 03
ACE-65 P 1/6 S
K D E 03 05
ACE-75 P 1/6 S
K D E 04 05 06
This manual applies only to the models and revisions listed in this table.

Page 4 002000MAN-01 1-Jun-2018
Tables & Documents ................................................ 5
ATF System Description ........................................ 6
General Overview ................................................................... 6
1. Air Heating Mode ................................................................ 6
2. Hydronic (Water) Heating Mode ......................................... 6
Defrost Operation................................................................. 6
3. Air Cooling Mode ................................................................ 6
Mode & Priority Selection ........................................................ 7
Auxiliary Air Heat .................................................................... 7
Factory Options ...................................................................... 7
ATF Sizing ....................................................................... 8
Heat Pump Sizing ................................................................... 8
Plenum Heater Sizing ............................................................. 8
Installation Basics ...................................................... 9
Sample Bill of Materials .......................................................... 9
Unpacking the unit .................................................................. 9
Indoor Unit Placement ............................................................ 9
Indoor Unit Blower Outlet Orientation .................................... 10
Outdoor Unit Placement ........................................................ 10
Outdoor Unit Mounting Height .............................................. 10
Average Max. Snow Depth Map - Canada ............................ 11
001915INF - Internal Plenum Heater Installation ................... 12
Wiring ............................................................................... 13
Indoor Unit Power Supply Connections ................................ 13
Outdoor Unit: Power Connections ........................................ 13
Auxiliary Plenum Heater: Power Supply Connections ........... 13
Auxiliary Plenum Heater: Signal Connections ....................... 13
Indoor Loop Circulator Pump Wiring ..................................... 13
Control Transformer .............................................................. 13
Outdoor Unit: Signal Connections ......................................... 14
Air Thermostat Connections .................................................. 14
Aquastat Connections (Optional) .......................................... 14
Other Connections ................................................................ 14
002071CDG - Typical GEN2 Thermostat Connections .......... 15
002304CDG - Typical ATF Wiring ......................................... 16
002067CDG - Typ. Heating Only Zone Wiring (Setpoint) ...... 17
002069CDG - Typ. Htg. Only Zone Wiring (Hardwired) ......... 18
Piping ............................................................................... 19
Indoor Loop Water Lines ........................................................ 19
Condensate Drain ................................................................. 19
Domestic Hot Water (Desuperheater) Connections .............. 19
002305PDG - Typical Piping Connections - ATF ................... 20
001046PDG - Typical Buffer Tank Configuration: 4 port ........ 21
001981PDG - Typical Buffer Tank Configuration: 2 port ........ 22
000530PDG - Typical Zone Types ......................................... 23
001055PDG - Connection to On-Demand DHW Tank ........... 24
000970PDG - Connection to DHW Pre-Heat Tank ................ 25
Ductwork ........................................................................ 26
Duct Systems - General ........................................................ 26
Duct Systems - Grill Layout ................................................... 26
Thermostat Location ............................................................. 26
Plenum Heater ....................................................................... 26
002249PDG - Typical Duct & Condensate Connections ........ 27
Duct Sizing Guide .................................................................. 28
ACE-Series Outdoor Unit Line Set ................. 29
Line Set Interconnect Tubing ................................................ 29
Oil Traps ............................................................................... 29
Pipe Insulation ...................................................................... 29
Silver Soldering Line Sets ..................................................... 29
Pressure Testing ................................................................... 29
Vacuuming the System .......................................................... 29
Charging the System ............................................................. 30
002250CDG - Typical Outdoor Unit Line Set Connections .... 31
Table of Contents
Operation ....................................................................... 32
BACnet Control ..................................................................... 32
Air Thermostat Operation ...................................................... 32
Hydronic Temperature Control .............................................. 32
1. Hydronic Heating: Setpoint Control ................................... 32
Setpoint Control Method 1 - Indoor Loop (ICR) ..................... 32
Setpoint Control Method 2 - External HTS/CTS .................... 32
Top Up S1 Function .............................................................. 33
Outdoor Reset ...................................................................... 33
2. Hydronic Heating: Signals Control .................................... 34
PC Application (PC App) ...................................... 35
PC Application Menus............................................................ 35
LCD Display & Menus ............................................ 51
BACnet Interface ........................................................ 53
Startup Procedure .................................................... 55
Pre-start Inspection ............................................................... 55
Unit Startup ........................................................................... 55
Startup Record ...................................................................... 57
General Maintenance ............................................. 58
Troubleshooting Guide ......................................... 59
Troubleshooting Tools .......................................................... 70
Repair Procedures ................................................... 71
Model Specific Information ................................ 72
Shipping Information (ATF Indoor Unit) ................................ 72
Shipping Information (ACE Outdoor Unit) .............................. 72
Refrigerant Charge ............................................................... 72
Indoor Loop Flow Rates ........................................................ 72
Operating Temperature Limits .............................................. 72
Outdoor Unit Sound Levels (dBA) ......................................... 72
Indoor Unit Sound Levels (dBA) ........................................... 72
Standard Capacity Ratings ................................................... 73
Performance Tables .............................................................. 74
Electrical Specifications ........................................................ 82
Airflow Data .......................................................................... 83
Wiring Diagram (208/230-1-60) ............................................ 84
Electrical Box Layout (208/230-1-60) .................................... 85
Wiring Diagram (208-3-60) ................................................... 86
Electrical Box Layout (208-3-60) ........................................... 87
Wiring Diagram (460-3-60) .................................................... 88
Electrical Box Layout (460-3-60) ........................................... 89
ACE-45/55 Wiring Diagram .................................................... 90
ACE-65/75 Wiring Diagram .................................................... 90
ATF-Series Refrigeration Circuit - Air Heating Mode ............. 91
ATF-Series Refrigeration Circuit - Air Cooling Mode ............. 92
ATF-Series Refrigeration Circuit - Hydronic Heating Mode .... 93
Dimensions ............................................................................ 94
Appendix A: Control Board Description .... 101
Appendix B: USB Driver Installation ............ 105
Appendix C: PC App Installation .................. 106
Appendix D: Updating Firmware .................... 107
Updating Firmware via PC App ........................................... 107
Updating Firmware via Jumper Pins .................................... 109
Warranty ....................................................................... 110

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Tables & Documents
Table 1 - Heat Pump Sizing ................................................................................................................................. 8
Table 2 - Plenum Heater Sizing ........................................................................................................................... 8
Table 3 - Power Supply Connections ................................................................................................................ 13
Table 4 - Outdoor Unit Power Supply Connections ........................................................................................... 13
Table 5 - Plenum Heater Signal Connections ................................................................................................... 13
Table 6 - Indoor Loop Circulator Connections ................................................................................................... 13
Table 7 - Control Transformer ........................................................................................................................... 14
Table 8 - Outdoor Unit Signal Connections ....................................................................................................... 14
Table 9 - Air Thermostat Connections ............................................................................................................... 14
Table 10 - Aquastat (Signals Control) Connections .......................................................................................... 14
Table 11 - Buffer Tank Size ............................................................................................................................... 19
Table 12 - Heat Pump Size vs. Hot Air Grills .................................................................................................... 26
Table 13 - Duct Sizing Guide ............................................................................................................................. 28
Table 14 - Interconnect Line Set Sizing ............................................................................................................ 29
Table 15 - Extra Charge Required ..................................................................................................................... 30
Table 16 - Extra Charge (Sizes 25-45) .............................................................................................................. 30
Table 17 - Extra Charge (Sizes 55-75) .............................................................................................................. 30
Table 18 - Typical Temperature Settings .......................................................................................................... 33
Table 19 - Maximum Output Temperature ........................................................................................................ 33
Table 20 - Typical Aquastat Settings ................................................................................................................. 34
Table 21 - BACnet Objects - Control Signals (Read/Write) ............................................................................... 53
Table 22 - BACnet Objects - Data (Read Only) ................................................................................................. 54
Table 23 - BACnet Objects - Alarms and Faults (Read Only) ............................................................................ 54
Table 24 - Shipping Information (ATF Indoor Unit) ........................................................................................... 72
Table 25 - Shipping Information (ACE Outdoor Unit) ........................................................................................ 72
Table 26 - Refrigerant Charge ........................................................................................................................... 72
Table 27 - Indoor Loop Flow Rates ................................................................................................................... 72
Table 28 - Operating Temperature Limits ......................................................................................................... 72
Table 29 - Outdoor Unit Sound Levels (dBA) .................................................................................................... 72
Table 30 - Indoor Unit Sound Levels (dBA) ....................................................................................................... 72
Table 31 - Standard Capacity Ratings - Air Heating (60 Hz) ............................................................................ 73
Table 32 - Standard Capacity Ratings - Air Cooling (60 Hz) ............................................................................. 73
Table 33 - Standard Capacity Ratings - Hydronic Heating (60 Hz) .................................................................. 73
Table 34 - ATF-Series Electrical Data ............................................................................................................... 82
Table 35 - Plenum Heater Electrical Data ......................................................................................................... 82
Table 36 - Airflow Range for Stage 2 (Full Load) .............................................................................................. 83
Table 37 - Airflow Range for Stage 1 (Part Load) ............................................................................................. 83
Table 38 - Airflow Range for Stage 3 (Auxiliary) ............................................................................................... 83
Table 39 - Airflow Range for Fan Recirculation ................................................................................................. 83
Table 40 - Airflow Range for Emergency .......................................................................................................... 83
Table A1 - Control Board Connector Descriptions (Top) ................................................................................. 102
Table A2 - Control Board Connector Descriptions (Left Side) ....................................................................... 102
Table A3 - Control Board Connector Descriptions (Bottom) ........................................................................... 103
Table A4 - Control Board Connector Descriptions (Right Side) ...................................................................... 104
001915INF - Internal Plenum Heater Installation ............................................................................................... 12
002071CDG - Typical Thermostat Connections to GEN2 Board ....................................................................... 15
002304CDG - Typical ATF Outdoor Unit, Auxiliary Heat, and Indoor Circulator Wiring .................................... 16
002067CDG - Typical Zone and Auxiliary Wiring with GEN2 Setpoint Control (Heating Only) ......................... 17
002069CDG - Typical Zone and Auxiliary Wiring with GEN2 Hardwired Option (Heating Only) ....................... 18
002305PDG - Typical Piping Connections - ATF ............................................................................................... 20
001046PDG - Typical Buffer Tank Configuration—Four Port Tank (Brass FPT)............................................... 21
001981PDG - Typical Buffer Tank Configuration—Two Port Tank (Brass FPT) ............................................... 22
000530PDG - Typical Zone Types for Hydronic Applications ............................................................................ 23
001055PDG - Single Unit Connection to On-Demand DHW Pre-Heat Tank ..................................................... 24
000970PDG - Single Unit Connection to DHW Pre-Heat Tank (Brass FPT) ..................................................... 25
002249PDG - Typical Duct & Condensate Connections - ATA/ATF Series ...................................................... 27
002250CDG - Typical ATA/ATF to Outdoor Unit Line Set Connections ............................................................ 31
001956SCH - ATF-Series Schematic Diagram 208/230-1-60 .......................................................................... 84
001957ELB - ATF-Series Electrical Box Diagram 208/230-1-60 ...................................................................... 85
001958SCH - ATF-Series Schematic Diagram 208-3-60 ................................................................................. 86
001959ELB - ATF-Series Electrical Box Diagram 208-3-60 ............................................................................. 87
001960SCH - ATF-Series Schematic Diagram 460-3-60 ................................................................................. 88
001961ELB - ATF-Series Electrical Box Diagram 460-3-60 ............................................................................. 89
001951SCH - ACE Outdoor Unit Schematic Diagram ...................................................................................... 90
002014SCH - ACE 4-Fan Outdoor Unit Schematic Diagram ............................................................................ 90
001844RCD - ATF-Series Refrigeration Circuit - Air Heating Mode ................................................................. 91
001845RCD - ATF-Series Refrigeration Circuit - Air Cooling Mode ................................................................. 92
001846RCD - ATF-Series Refrigeration Circuit - Hydronic Heating Mode ....................................................... 93
Tables
Documents

Page 6 002000MAN-01 1-Jun-2018
General Overview
The ATF-Series heat pump is an air source heat pump
that can heat or cool via a forced air duct system, as well as
heat water for hydronic application like in-floor heating. It is the
air-source version of the geothermal Nordic TF-series, which is
a unique product with a long history of reliable operation.
Being an air source heat pump, it does not require a
ground loop, instead using an outdoor evaporator / condenser to
exchange heat with the outdoor air. Unlike most air source out-
door units on the market, this outdoor unit contains only an air
coil, ECM hub motor fan, heating mode electronic expansion
valve (EEV), and an outdoor temperature sensor.
The remaining components, including the compressor and
all electronics, are contained in the indoor unit. This has several
advantages: minimal installation and service work must be per-
formed outdoors, important components are in the conditioned
space for longevity, and domestic hot water (desuperheater
circuit) is possible since the fresh water lines are inside and will
not freeze.
The air heating and cooling functions are controlled by a
standard 3H/2C 24V room thermostat. The hydronic heating
control is done by an internal routine that maintains the buffer
tank temperature, without external sensors (’Setpoint Control’).
BACnet or an external aquastat can also be used.
In additional to the main hydronic water heating function,
there is a double-wall desuperheater for pre-heating domestic
hot water with ~5% of the heat pump’s capacity. This function is
only active when the heat pump is running for space heating or
cooling purposes.
The outdoor air coil is e-coated for corrosion protection,
and the coaxial hydronic heat exchanger is copper / steel with
optional CuNi inner tube available. The cabinets are powder
coated galvanized sheet metal. Control is overseen by the Nor-
dic GEN2 programmable control board, which has many ad-
vanced features like laptop connectivity via the free PC App
software, data logging & graphing, and real time readout from
electronic temperature & pressure sensors. A premium electri-
cally commutated (ECM) blower motor with adjustable airflow is
standard.
1. Air Heating Mode
In air heating mode, the heat pump heats warm air in a
duct system. Superheat is controlled by the heating EEV locat-
ed in the outdoor unit while the EEV in the indoor unit is set to
full open. As the unit operates, heat is extracted from the out-
door air, which causes the air coil to eventually frost up to the
point that a defrost cycle is required. The time between defrost
cycles varies depending on the outdoor conditions; refer to the
Defrost Operation section below.
If the outdoor temperature is above 34°F(1°C), the outdoor
unit fan starts and stops when the heat pump starts and stops.
If the temperature is below 34°F(1°C), the outdoor fan will re-
main on at a very slow speed when the heat pump is off in order
minimize the chance of a fan freeze up, and to prevent snow
from entering the unit through the fan opening during a snow
storm. The outdoor fan is controlled based on the suction pres-
sure and will slowly ramp up to the required speed when the
system starts. The heat pump will turn off and only the auxiliary
heating system will operate if the outdoor temperature gets too
cold. Refer to the Model Specific Information section for the
limits of operation.
ATF System Description
2. Hydronic (Water) Heating Mode
In hydronic heating mode, the heat pump heats hot water
in the buffer tank. EEV, outdoor fan, and defrost operation are
the same as in air heating mode.
Defrost Operation
The heat pump has an advanced defrost control algorithm
intended to provide a minimal number of defrosts and minimal
defrost cycle time, while achieving complete defrost. The out-
door unit’s unique design also has excellent resistance to coil
freeze-ups and potential future air coil damage as a result of
repeated freeze-ups.
The system uses the outdoor temperature and suction
pressure to determine when a defrost cycle should occur as well
as how long it should be. PID fan control allows the discharge
pressure to rise quickly and then be maintained at a desired
setpoint for quick defrosting. A “defrost disabled” period occurs
after a defrost cycle which allows a potential problem with the
unit to be identified as an alarm to prevent repetitive defrost
cycles.
The outdoor unit has a unique design for combatting ice
build up, a common problem with air source units. The coil sits
on a 15° angle and the area below the coil is completely open
(no drip tray). The angle causes the melting frost/snow to run
down the back of the coil, which creates a single line of runoff
along the back bottom edge of the coil rather than along the
entire bottom side of the coil. Runoff occurs more quickly and at
a higher velocity, minimizing the amount that remains trapped at
the bottom of the coil due to surface tension between the coil
fins. This arrangement means it is virtually impossible for runoff
to remain between coil pipes and re-freeze between them, a
common cause of air coil failure in air source heat pumps.
3. Air Cooling Mode
In air cooling mode, the heat pump cools air through the
duct system. Superheat is controlled by the cooling EEV located
in the indoor unit while the EEV in the outdoor unit is set to full
open. As the unit operates, heat is extracted from the home
and rejected to the outdoor air. There is no defrost cycle in air
cooling mode.
The outdoor fan is controlled based on the discharge pres-
sure and will slowly ramp up to the required speed when the
system starts. During operation, the fan speed will automatical-
ly adjust up or down to in order to maintain the discharge pres-
sure setpoint value. The discharge pressure will begin to rise
above the setpoint when the outdoor temperature exceeds the
point at which the outdoor fan speed reaches its maximum val-
ue. Two stage units will drop down to the first stage to reduce
the discharge pressure at elevated outdoor temperatures. Refer
to the Model Specific Information section for the limits of opera-
tion.

1-Jun-2018 Page 7 002000MAN-01
Factory Options
The indoor unit can be ordered as a left or right hand re-
turn from the factory. This must be specified at time of order as
the physical construction of the two configurations is different.
Mode and Priority Selection
The heat pump can be set to Air or Hydronic priority. Units
are shipped set up for air priority. This is normally a good set-
ting, since drops in the household air temperature normally oc-
cur sooner if there is a lag in the ducted air system than if there
is a drop in the hydronic water temperature.
Whenever there is a stage 1 demand from both the air
thermostat and aquastat, the unit steps up to stage 2 of the pri-
ority mode in order to satisfy the priority demand quickly and get
to the non-priority mode. If this functionality was not present,
the unit could run in stage 1 of the priority mode (67% compres-
sor capacity) for a long time with a ‘call waiting’, allowing the
overall supply of heat to the building to fall behind the load.
SINGLE MODE OPERATION:
If there is only one mode being called for, the unit operates
in the mode and stage that is called for.
SIMULTANEOUS DEMANDS - AIR PRIORITY:
If there is a call for:
 both stage 1 air and stage 1 hydronic
 both stage 2 air and stage 1 hydronic
 both stage 1 air and stage 2 hydronic
 both stage 2 air and stage 2 hydronic
The unit operates in air mode in stage 2.
SIMULTANEOUS DEMANDS - HYDRONIC PRIORITY:
If there is a call for:
 both stage 1 air and stage 1 hydronic
 both stage 2 air and stage 1 hydronic
 both stage 1 air and stage 2 hydronic
 both stage 2 air and stage 2 hydronic
The unit operates in hydronic mode in stage 2.
Auxiliary Air Heat
While ATF is operating in any mode, auxiliary heat (plenum
heater) will also be engaged if the air temperature drops below
the air heat auxiliary setpoint. It is required that auxiliary heat
be installed for all air source heat pumps, since the capacity of
air source heat pumps falls as the outdoor temperature drops
and the heating load increases.
The first function of the plenum heater is to act as an auxil-
iary heat source for the ducted air system. It will provide addi-
tional air heating on cold days when the air source heat pump
has reduced output. This output reduction can be seen in the
performance charts later in this manual, and is common to all air
source heat pumps.
The second function of the plenum heater is to provide
emergency heat should a problem occur that causes the heat
pump to be locked out on a safety control. The control board
automatically controls the auxiliary heat, allowing the plenum
heater to function even if the heat pump is locked out and not
operational.
Electric plenum heaters are available as accessories. See
the Sizing, Wiring, and Ductwork sections. These heaters
are installed inside the ATF indoor unit, unless the fan is in-
stalled in the side discharge position, in which case it is installed
the air discharge ductwork outside the heat pump.

Page 8 002000MAN-01 1-Jun-2018
ATF Sizing
Plenum Heater Sizing
Plenum heaters are available as accessories in 5, 7, 10,
15 and 20kW sizes. Choose a size that covers 100% of the
coldest day heat load, according to the heat loss analysis men-
tioned in the last section. If that is not available, use the follow-
ing recommendation:
This is which unit size is required for a typical two-level
home (main level and below grade basement) with R-20 walls,
R-40 ceiling and average size and number of windows. The
Heated Area is the area of the main level. The table accounts
for a basement the same size as the heated area.
IT IS HIGHLY RECOMMENDED THAT A PROPER HEAT
LOSS/GAIN ANALYSIS BE PERFORMED BY A PROFES-
SIONAL WITH APPROVED CSA F-280 SOFTWARE BEFORE
SELECTING THE SIZE OF UNIT REQUIRED FOR THE APPLI-
CATION.
The analysis will result in a heat load for the coldest day,
which is influenced by, for example, the number of levels, the
size of the windows, the orientation of the home, attached gar-
age, bonus rooms, walk-in basement, and coldest outdoor tem-
perature for the region.
In northern climates, a heat pump model size can be se-
lected by matching the calculated heat load to a heat pump’s
standard capacity rating at an outdoor temperature of 35°F
(1.7°C), which is the AHRI H22 test condition. These are listed
in the Model Specific Information section later in this manual.
This sizing will result in a good compromise between covering
as much of the cold weather heat load as possible without utiliz-
ing backup heat, while minimizing excessive cycling (turning on
and off frequently) during moderate outdoor temperatures.
It should be noted that sizing an air source heat pump is
always a compromise between covering coldest-day heat load
and minimizing cycling due to over-capacity in warm weather.
In cooling dominant climates, the heat pump should be
similarly sized, by matching the calculated cooling load to the
standard capacity rating at an outdoor temperature that matches
the local maximum outdoor temperature. The difference here is
that it is necessary to cover all of the cooling load, since there is
no backup cooling.
Even in northern heating dominant climates, it should
be ensured that 100% of the cooling load will be covered
when sizing the heat pump.
Heat Pump Sizing
TABLE 1 contains a guideline to the size of home each
air source heat pump size can handle.
TABLE 1 - Heat Pump Size vs. Heated Area
Model sq.ft. m2
45 1,400 130
55 2,000 185
65 2,600 240
75 3,100 290
TABLE 2 - Plenum Heater Sizing
Model
Plenum Heater Size (kW)
Recommended Internally Possible
45 10 5, 7, 10
55 10 5, 7, 10, 15, 20
65 15 5, 7, 10, 15, 20
75 20 5, 7, 10, 15, 20
Two styles of plenum heater are available; the first is for
internal installation (inside the indoor unit). Note limit for size 45
in above table.
The second has a wider element profile for installation
outside the unit, in the ductwork. If field-installing the fan in the
convertible side discharge position, this type of plenum heater
will need to be used.

1-Jun-2018 Page 9 002000MAN-01
Installation Basics
Unpacking the Unit
When the 2-piece heat pump reaches its destination it
should be unpacked to determine if any damage has occurred
during shipment. Any visible damage should be noted on the
carrier's freight bill and a suitable claim filed at once.
Indoor Unit Placement
For air to air units, to achieve the greatest efficiency, the
indoor unit should be centrally located in the home with respect
to the conditioned space. A heating system cannot be expected
to produce an even temperature throughout the house when it is
located at one end of the structure and the air is transmitted with
uninsulated metal ductwork.
If possible the front access panel and side access panel
opposite the air return should remain clear of obstruction for a
distance of two feet to facilitate servicing and general
maintenance. No access is required on the back side. Ensure
the unit is level to eliminate any possible condensate draining
issues.
Raising the indoor unit off the floor a few inches is
generally a good practice since this will prevent rusting of the
bottom panel of the unit and deaden vibrations. An anti-
vibration pad, available as an accessory, or a piece of 2”
styrofoam should be placed under the unit. Be careful not to run
piping in front of the filter rack access cover, since access is
required in order to change the air filter.
WARNING: Pool chemicals should be stored
in a different room from the PC unit to pre-
vent premature corrosion problems.
WARNING: Pool chemicals should be inject-
ed downstream of the PC unit.
Sample Bill of Materials
Although not exhaustive, following is a list of materials needed
for a typical installation:
FROM MARITIME GEOTHERMAL
• ATF SERIES HEAT PUMP (L OR R RETURN)
W/ACE OUTDOOR UNIT
• PLENUM HEATER __kW
• AIR THERMOSTAT (WIFI OR STD)
• SHIELDED 18-8 WIRE FOR OUTDOOR UNIT
• BUFFER TANK W/ELEMENTS __kW
OPTIONAL FROM MARITIME GEOTHERMAL
• ANTI-VIBRATION PAD FOR UNDER UNIT
• SOUND JACKET
• COMPRESSOR SECURE START
• ELECTROSTATIC (CLEANABLE) AIR FILTER
DUCTWORK
• OUTLET PLENUM ADAPTER W/ FLEXIBLE COLLAR
• RETURN AIR ADAPTER W/ FLEXIBLE COLLAR
• FIBREGLASS INSULATION (FOR NOISE, IF REQ’D)
• TRUNK DUCT W/ JOINERS (IF NOT EXISTING)
• 6” ROUND DUCT W/ADAPTERS (IF NOT EXISTING)
• ALUMINUM TAPE
• SHEET METAL SCREWS
DHW:
• PREHEAT TANK, 40 OR 60 GAL
• ½” COPPER PIPE
• ½” FITTINGS, BALL VALVES, BOILER DRAINS, CV
ELECTRICAL
• HEAT PUMP SERVICE WIRE: 6-2/3 OR 8-2/3
• PLENUM HEATER SERVICE WIRE
• 14-2 OUTDOOR RATED WIRE W/ DISCONNECT
SWITCH FOR OUTDOOR UNIT
• HEAT PUMP BREAKER
• PLENUM HEATER BREAKER
• THERMOSTAT WIRE 18-8
• THERMOSTAT WIRE 18-3 (PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE (6)
• CONDENSATE PUMP & HOSE (IF REQUIRED)
REFRIGERATION
• 1/2” & 7/8” (OR 3/8” & 3/4”) ACR TUBING
• PIPE ISULATION
• EXTRA R410A REFRIGERANT FOR LINESETS >25 FT
INFLOOR ZONES
• CIRCULATOR: HEAT PUMP TO TANK
• 1” PIPE & FITTINGS: HEAT PUMP TO TANK
• ZONE CIRCULATOR(S)
• ZONE TRANSFORMER & CIRC CONTACTOR
• ZONE VALVES (IF NOT INDIVIDUAL PUMPS)
• IN-FLOOR PIPING
• ZONE THERMOSTATS
• RELAYS OR ZONE CONTROLLER
• ZONE SUPPLY & RETURN HEADERS:
1” COPPER PIPE & FITTINGS
• PIPE & FITTINGS TO ZONES
• EXPANSION TANK
• 2” STYROFOAM INSUL. (IF PAD NOT PURCHASED)

Page 10 002000MAN-01 1-Jun-2018
The heat pump can be ordered as a left or right hand re-
turn from the factory. This must be specified at time of order as
the physical construction of the two configurations is different.
Outdoor Unit Placement
The ACE unit must be placed outdoors, with the fan point-
ing away from the building. It should be at least 12 inches (30
cm) away from the building or other obstructions on the
back and sides for unimpeded return airflow. There should be
little or no obstruction in the fan (front) direction for at least 30
feet (9 m), otherwise airflow and therefore overall perfor-
mance will be reduced.
In addition, there should be at least two feet (0.6 m) of
clearance on the electrical box and refrigeration piping side of
the unit to facilitate servicing and general maintenance.
The ACE must be bolted down to prevent a tipping hazard.
Leg Kit Installation
Indoor Unit Blower Outlet Orientation
The indoor units has a field configurable blower position.
Its default location from the factory is in the top of the unit,
providing a “ninety” in the airflow. It can easily be placed in the
side of the unit for straight through airflow. Note that if this is
done, plenum heater will need to be placed in ductwork outside
unit.
To switch the location of the fan outlet:
1. Turn the power of to the unit.
2. Remove the screw that holds the side access panel in
place and remove the access panel by pulling up on
the handle and then outward from the bottom.
3. Disconnect the two wire harnesses and ground wire
from the fan motor.
4. Repeat step 2 for the access panel with the fan
mounted in it. Set the assembly on the floor.
5. Disconnect the plenum heater extension from the fan
housing and from the access panel.
6. Mount the fan housing directly to the access panel.
7. Install the fan/panel in the new location and secure
with the screw.
8. Reconnect both harnesses and ground wire.
9. Install the remaining access panel and secure with the
remaining screw.
Outdoor Unit Mounting Height
The outdoor unit must remain clear of snow and ice at all
times. Good performance depends on good airflow, which of
course cannot be achieved if the unit is buried in the snow.
To this end, several strategies may be employed. First,
look up how much snowfall is expected in your area, either from
local knowledge or weather data. The snowfall map included on
next page can be used as a rough guide for Canada.
1. If the local climate has less than ~4” of snow accumu-
lation, the unit can be mounted directly on a concrete
pad. In this case, care must be taken to ensure re-
frozen condensate does not build up under unit.
2. The unit can be mounted on angle brackets attached
to the side of a building. Be sure to adhere to the
minimum clearance requirement of 12” (30 cm), and
use brackets designed for twice the unit weight.
3. Two different leg kits which add either 15” (38 cm) or
30” (76 cm) of additional height are available as an
accessory from Maritime Geothermal Ltd.
To attach the legs, first remove the three bolts with flat
washers that hold each foot plate in place. Leaving the foot
plate in place on the inside of the cabinet panel, slide the leg
over the outside of the panel and re-install the three bolts and
flat washers.
Whether or not a foot kit is used, be sure to mount the unit
using the 4 rubber grommets included with the unit, to dampen
any vibration. The unit must be fastened to its mounting surface
with four min. 5/16” bolts through these grommets to pre-
vent a tipping hazard due to impact or high wind.
IMPORTANT NOTE: The line set between the
indoor and outdoor units must not exceed 70
ft (21 m) in length.
Outdoor Unit
Fan Orientation
Top Discharge
(Internal Ple-
num Heater)
Side Discharge
(External Ple-
num Heater)

1-Jun-2018 Page 11 002000MAN-01
Average Maximum Snow Depth - Canada (1979-1997)
Source: Natural Resources Canada

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Wiring
IMPORTANT NOTE: A properly qualified
electrician should be retained for all
connections to the heat pump and associat-
ed controls. The connections to the unit
MUST CONFORM TO LOCAL CODES.
TABLE 3 - Power Supply Connections
Line Description Voltages
L1 Line 1 All
L2 Line 2 All
L3 Line 3 3-phase only
GND Ground All (connect to ground lug)
** Only required if connecting 115VAC circulators.
N** Neutral 208/230-1-60, 208-3-60
Indoor Unit Power Supply Connections
Power supply for the heat pump from the breaker panel is
supplied to the indoor unit. The unit has a concentric 1.093” /
0.875” knockout for main power supply connection to the electri-
cal box. There are also two 7/8” knockouts and a 1/2” opening
with plastic grommet (grommet hole is 3/8”) for connections to
the air thermostat, optional aquastat, and power and signal con-
nections to the outdoor unit.
A schematic diagram (SCH) and electrical box layout
diagram (ELB) can be found on the electrical box cover of the
unit as well as in the Model Specific Information section of this
manual.
The Electrical Tables in the Model Specific Information
section contain information about the wire and breaker size.
Indoor Loop Circulator Pump Wiring
The indoor unit has provisions for connecting the indoor
circulator pump (between the heat pump and buffer tank) so that
it will be turned on whenever the compressor operates. Con-
nect the circulator pump module to the appropriate two terminals
(115V & 115/230 or 230V & 115/230) of the terminal strip
marked Indoor Circulator Pumps, as per the voltage of the circu-
lator pump module. Ground wires should be connected to the
ground lug in the electrical box. Ensure that the total current
draw does not exceed the value indicated on the label in the
heat pump electrical box.
For 460VAC models, only 277VAC circulators may be
powered directly from the heat pump. If other voltage circulators
are used, they must be powered using an external contactor
actuated by the ICR terminal on the left side of the control board
and the C (24V ground) terminal.
TABLE 6 - Indoor Loop Circulator Connections
Signal Description
115V
230V
Use a 2-conductor 14ga cable.
Connection for 115V circulator
Connection for 230V circulator
115/230 Connection for 115V or 230V circulator
TABLE 4 - Outdoor Unit Power Supply Connections
Line Description
L1 Supply line
L2 Supply line
GND Ground
Use a two conductor outdoor rated 14ga minimum cable.
IMPORTANT NOTE: According to most
codes, a disconnect switch visible and/or
reachable from the outdoor unit must be in-
stalled in the power supply cable. If the
switch has fuses or breakers they must be
no more than 10A.
Outdoor Unit: Power Connections
The ACE outdoor unit is powered from the indoor unit.
The power supply for the ACE unit is 208 to 277VAC, 50/60Hz.
The ATF and ACE units have matching terminal strips for these
connections. Use a two conductor, minimum 14ga outdoor rat-
ed cable for this connection. Refer to diagram.
the size of wire for the connections, as well as the recommend-
ed breaker size.
Auxiliary Plenum Heater:
Signal Connections
The ATF unit has two dry contacts to control the 2 stages
of the plenum heater. These dry contacts can also be used to
control other types of auxiliary air heat. Note that dry contacts
are intended to activate equipment that has its own 24VAC
transformer; if equipment does not have its own transformer,
one will need to be installed in an external electrical box.
Connect the terminals on the ATF’s terminal strip to the
matching terminals on the plenum heater’s control board using
an 18-3 cable.
TABLE 5 - Plenum Heater Signal Connections
Signal Description
CP Common
1
2
Use a 3-conductor 18ga cable.
Dry contact for auxiliary heat stage 1
Dry contact for auxiliary heat stage 2
Auxiliary Plenum Heater:
Power Supply Connections
Auxiliary air heat will usually be provided by an electric
duct heater (plenum heater). These are available as accesso-
ries in 5, 7, 10, 15, and 20 kW sizes, and are installed as previ-
ously noted in this manual. The plenum heater will have its own
breaker and power supply wire. The Electrical Tables in the
Model Specific Information section contain information about
Control Transformer
The rest of the low voltage controls, including the control
board, are powered by a 100VA class II transformer. 208/230-1
-60 and 208-3-60 models have a resettable breaker on the sec-
ondary side for circuit protection. Should the breaker trip, locate
and correct the problem and then reset the breaker by pressing
in on it.
All other voltage models have primary and secondary fus-
es for circuit protection.

Page 14 002000MAN-01 1-Jun-2018
Outdoor Unit: Signal Connections
The speed of the fan and the heating mode expansion
valve (EEV) in the outdoor unit are controlled by the control
board in the indoor ATF unit, and a temperature sensor is read.
Therefore, communication wiring is required.
The indoor and outdoor units have matching terminal
strip signals for these connections. Connect an 8 conductor
shielded outdoor rated cable (supplied) between the termi-
nal strip in the ATF and the terminal strip in the Outdoor Unit.
The signals are marked as Outdoor Unit Signal Connections on
the ATF terminal strip. The shield ground wire is connected
only to the indoor unit; do not connect the shield ground to
the outdoor unit (there is no terminal for it). Simply cut the
shield ground wire short at the cable sheath in the Outdoor Unit.
TABLE 7 - Control Transformer
Voltage Low Voltage Circuit Protection
(1) 208/230-1-60 Resettable breaker on transformer
(2) 208-3-60 Resettable breaker on transformer
(4) 460-3-60 Primary / Secondary fuses
IMPORTANT NOTE: For 208/230VAC-1-60
units, if connecting to 208VAC power supply
move the red wire connected to the 240 ter-
minal of the transformer to the 208 terminal
of the transformer.
Other Connections
In most installations, accessories that are not already de-
scribed will not be required. Other available accessories or ex-
ternal connections include:
 External buffer tank temperature sensor, replacing the inter-
nal water OUT line temperature sensor for use with the ATF
control board’s Setpoint Control routine. This is called HTS/
CTS Setpoint Control, described later.
 Compressor current sensor.
 BACnet, for external control of air heating/cooling and water
heating demand by the building control system.
See the wiring (SCH) diagrams in the Model Specific Infor-
mation section or on the electrical box cover for these con-
nections.
TABLE 8 - Outdoor Unit Signal Connections
Signal Description
EEVR Electronic Expansion Valve (Red)
EEVG Electronic Expansion Valve (Green)
EEVW Electronic Expansion Valve (White)
EEVB Electronic Expansion Valve (Black)
TR Outdoor Temperature Sensor (Power)
TG Outdoor Temperature Sensor (Signal)
TB Outdoor Temperature Sensor (Ground)
PWM+ Outdoor Fan Control
Shield GND* Shielded cable ground wire
* Connect only to the indoor unit. In the outdoor unit,
leave this wire unconnected and cut it short at the cable
sheath.
TABLE 9 - Air Thermostat Connections
Signal Description
C 24VAC common (ground)
R 24VAC hot
G Fan low speed (for air recirculation)
Y1 Heat pump stage 1
Y2 Heat pump stage 2
W2 Heating stage 3 (plenum heater)
O Cooling mode (reversing valve)
E Emergency heat (plenum heater)
L Fault (24VAC when fault condition)
AR Airflow reduction: connect AR1 to AR2 with a
dry contact to reduce the airflow for zoning. Con-
nections located on control board.
24VAC
TABLE 10 - Aquastat (Signals Control) Connections
Signal Description
C 24VAC common (ground)
R 24VAC hot
Y1A Compressor ON (Part Load)
Y2A Compressor bump up to Stage 2 (Full Load)
Air Thermostat Connections
A three-stage heating and two stage cooling heat pump
configurable thermostat is required. The stages are S1 = stage
1 compressor, S2 = stage 2 compressor and S3 = electric auxil-
iary (in heating mode only). One can be ordered with the unit,
or other heat pump thermostats with the same number of stages
can be used. The air thermostat connections are located on a
terminal strip in the indoor unit. Refer to diagram on a following
page for connections between the thermostat and the heat
pump.
The air flow can be further reduced by an adjustable
amount between 5 and 20% (value set in PC App) by making a
dry contact across 24VAC and AR on the right side middle ter-
minal strip of the control board. This can be used for applica-
tions that have multiple air zones.
Care should be taken to ensure that the unit does not trip a
safety control in heating or cooling mode if the AR reduction is
used in conjunction with lower air flow settings.
Aquastat Connections (Optional)
Most installations will use the internal Setpoint Control
routine to control buffer tank temperature, in which case no aq-
uastat is required. However, an aquastat or aquastats can be
used if required, for example if heating two loops with different
setpoint temperatures. This is called Signals Control.
The wiring connections are at the top right of the ATF’s
control board, on the screw terminal connector section marked
AQUASTAT. This is shown on the wiring (SCH) diagram in
the Model Specific Information section. The external device
needs to send the 24VAC signal from RA back to the Y1A and
Y2A terminals to call for the two stages of hydronic heating. C
is the common or ground terminal for powering the external de-
vice.

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Indoor Loop Water Lines
The connections for the Indoor Loop circuit are 1”
brass FNPT. They are labelled as INDOOR IN and INDOOR
OUT. The ports are located on the front of the unit.
A typical 2 port buffer tank system is shown in drawing
001981PDG . This diagram shows all of the recommended
components as well as where they should be placed. A typical 4
port buffer tank system is shown in drawing 001046PDG . Un-
ions or some other form of disconnect should be used so that
the coaxial heat exchanger may be accessed should it require
cleaning.
NOTE: It is recommended that the water lines between the
heat pump and the buffer tank be copper or other high tempera-
ture piping.
NOTE: Care should be taken when routing the water lines to
ensure that adequate access to the heat pump is maintained so
as to not compromise ease of serviceability.
The minimum buffer tank size should follow the rule of 8
US gallons per ton of heat pump capacity. TABLE 11 shows the
minimum buffer tank size for each heat pump along with the
recommended size. The recommended size will minimize the
number of starts per hour and provide longer runtimes for im-
proved efficiency.
Piping
Domestic Hot Water
(Desuperheater) Connections
The port connections for the DHW circuit are 1/2” brass FPT
fittings. They are marked as DHW IN and DHW OUT.
A typical piping diagram for a pre-heat tank configuration
can be found in drawing 000970PDG at the end of this section.
Be sure to note the position of the check valve and the direction
of water flow. Other configurations are possible, and there may
be multiple units tied together in larger buildings.
Ensure the tank is filled with water and under pressure
before activating the built-in DHW circulator as described below.
First, slightly loosen the boiler drain on the DHW Out pipe to
allow air to escape from the system. This step will make certain
that the domestic hot water circulator in the unit is flooded with
water when it is started.
Activate the built-in DHW circulator by connecting the
brown wire with the blue insulated terminal to L1 of the com-
pressor contactor. Ensure the power is off when connecting the
wire. Once connected the DHW switch on the front of the
unit may be used to enable/disable the domestic hot water circu-
lator.
The DHW loop may have to be purged of air several times
before good circulation is obtained. A temperature difference
between the DHW In and DHW Out can be felt by hand when
the circulator pump is operating properly.
For the pre-heat tank setup, the final tank should be set to
140°F (60°C), which is required by most codes. The pre-
heat tank does not require electric elements. This setup takes
full advantage of the desuperheater as it is the sole heat provid-
er to the pre-heat tank. The desuperheater remains active dur-
ing the compressor runtime until the pre-heat tank has been
completely heated by the desuperheater alone. This setup is
more energy efficient than a single tank setup, and eliminates
the possibility of reverse heating of the refrigerant gas in cooling
mode.
WARNING: USE ONLY COPPER LINES TO
CONNECT THE DESUPERHEATER. TEM-
PERATURES COULD REACH 200F SHOULD
THE DHW CUTOUT SWITCH FAIL, POTEN-
TIALLY MELTING & RUPTURING PLASTIC
PIPING.
CAUTION: the domestic hot water pump is
water lubricated; damage will occur to the
pump if it is run dry for even a short period
of time.
CAUTION: If two (2) shut-off valves are
located on the domestic hot water ines as
shown in the diagram, a pressure relief valve
must be installed to prevent possible dam-
age to the domestic hot water circulator
pump should both valves be closed.
TABLE 11 - Buffer Tank Size
Heat Pump Size Minimum Size
gallons (Litres)
Recommended Size
gallons (Litres)
45 24 (91) 50 (190)
55 32 (121) 70 (265)
65 40 (151) 70 (265)
75 48 (182) 70 (265)
If a tank size is not available, use the next size larger tank.
Condensate Drain
The unit comes equipped with one 3/4” female PVC socket
drain connection. This drain allows the condensate which forms
during the air-conditioning cycle to be removed from the unit.
The drain should be connected and vented as per local codes.
During high humidity weather, there could be as much as 25
gallons of water formed per day.
The condensate drain is internally trapped and does not
require an external trap. An external condensate pump may be
installed if there is not sufficient slope to drain condensate under
gravity to its destination.
To avoid overflow of the condensate pan, the drain line
and trap should be inspected periodically to ensure they are not
plugged with accumulated debris.

Page 20 002000MAN-01 1-Jun-2018