Maritime Geothermal TF Series Manual

15-Jan-2019 Page 1 002362MAN-01
Maritime Geothermal Ltd.
P.O. Box 2555, 170 Plantation Road
Petitcodiac, NB E4Z 6H4
[phone]
TF-Series
Triple Function Geothermal Heat Pump (Gen2)
Two-stage R410a
Model Sizes 45-80
[email protected]
www.nordicghp.com
002362MAN-01
15-Jan-2019
Installation and Service Manual

Page 2 002362MAN-01 15-Jan-2019
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:
TF = Active Cooling Liquid to Air &
Liquid To Water
Nominal Size:
45 = 030 compressor
55 = 040 compressor
65 = 051 compressor
75 = 060 compressor
80 = 067/70 compressor
Functions:
H = Heating
AC = Active Cooling
W = Domestic Hot Water
Refrigerant:
P = R410a
Voltage Code:
1 = 208/230-1-60
2 = 208-3-60
3 = 265/277-1-60
4 = 460-3-60
6 = 220-1-50
7 = 380-3-50
Compressor:
S = 1 Stage Scroll
T = 2 Stage Scroll
Indoor Loop Exchanger:
C = Copper
Y = CuNi coil & piping
Z = CuNi coil only
Air Coil:
S = Standard
K = Coated
Fan Type:
D = Direct Drive
Fan Motor:
E = ECM (Variable Speed)
Fan Return Orientation:
L = Left Return
R = Right Return
Fan Outlet Orientation:
F = Field Configurable
(top or side)
Revision:
01, 02 etc.
TF—65—HACW—P—1T—CC—SDERF—xx
Outdoor Loop Exchanger:
C = Copper
Y = CuNi coil & piping
Z = CuNi coil only

15-Jan-2019 Page 3 002362MAN-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
MODEL FUNCTION REFRIGER-
ANT VOLTAGE COMPRESSOR OUTDOOR COIL
INDOOR
COIL
AIR COIL/
BLOWER/
AIR RETURN
AIR
RETURN
AIR
OUTLET REVISIONS
TF-45 H A C W P
1
2
4
6
7
T
C
Y
Z
C
Y
Z
S D E L
R F 16
TF-55 H A C W P
1
2
4
6
7
T
C
Y
Z
C
Y
Z
S D E L
R F 16
TF-65 H A C W P
1
2
4
6
7
T
C
Y
Z
C
Y
Z
S D E L
R F 16
TF-75 H A C W P
1 T
C
Y
Z
C
Y
Z
S D E L
R F 16
2 T
4 T
6 S
7 T
TF-80 H A C W P
1
2
4
7
S
C
Y
Z
C
Y
Z
S D E L
R F 16
This manual applies only to the models and revisions listed in this table.

Page 4 002362MAN-01 15-Jan-2019
Tables & Documents ........................................................ 5
TF System Description ..................................................... 6
General Overview ................................................................... 6
1. Air Heating Mode ................................................................ 6
2. Hydronic (Water) Heating Mode ......................................... 6
3. Air Cooling Mode ................................................................ 6
Mode & Priority Selection ........................................................ 7
Auxiliary Air Heat .................................................................... 7
Auxiliary Hydronic Heat ........................................................... 7
Factory Options ...................................................................... 7
Air Outlet Orientation .............................................................. 7
TF-Series Sizing ................................................................. 8
Heat Pump Sizing ................................................................... 8
Plenum Heater Sizing ............................................................. 8
Installation Basics ............................................................. 9
Sample Bill of Materials - Ground Loop Installations .............. 9
Sample Bill of Materials - Open Loop Installations .................. 9
Unpacking the unit ................................................................ 10
Unit Placement ..................................................................... 10
Air Outlet Orientation ............................................................. 10
Air Return Orientation ........................................................... 10
001915INF - Internal Plenum Heater Installation ................... 11
Wiring ................................................................................. 12
Power Supply Connections ................................................... 12
Auxiliary Plenum Heater: Power Supply Connections ........... 12
Auxiliary Plenum Heater: Signal Connections ....................... 12
Indoor Loop Circulator Pump Wiring ..................................... 12
Outdoor Loop Pump Module Wiring (Ground Loop Only) ..... 12
Control Transformer .............................................................. 12
Open/Closed Loop Wiring ..................................................... 13
Domestic Hot Water (Desuperheater) ................................... 13
Ducted Air Thermostat Connections ...................................... 13
Hydronic Backup Wiring ........................................................ 13
Aquastat Connections (Optional) .......................................... 13
Other Connections ................................................................ 13
002071CDG - Typical GEN2 Thermostat Connections .......... 14
002374CDG - Typ. TF Auxiliary Heat & Circulator Wiring ...... 15
002067CDG - Typ. Heating Only Zone Wiring (Setpoint) ...... 16
002069CDG - Typ. Htg. Only Zone Wiring (Signals/Hardw) .. 17
Piping ................................................................................. 18
Indoor Loop ........................................................................... 18
Outdoor Loop ........................................................................ 18
Condensate Drain ................................................................. 18
Domestic Hot Water (Desuperheater) Connections .............. 18
002238PDG - Typical Loop Connections - TF Series ............ 19
002366PDG - Recommended Hydronic Buffer Tank Piping .. 20
002367PDG - Auxiliary Boiler Piping ..................................... 21
000530PDG - Typical Zone Types ......................................... 22
001055PDG - Connection to On-Demand DHW Tank ........... 23
000970PDG - Desup. Connection to DHW Pre-Heat Tank .... 24
Ground Loop Installations ............................................ 25
Circulator Pump Module ....................................................... 25
Flushing & Purging ............................................................... 25
Adding Antifreeze Solution .................................................... 26
Initial Pressurization .............................................................. 26
Pipe Insulation ...................................................................... 26
000608INF - Typical Horiz. Ground Loop Configuration ........ 27
000609INF - Typical Vert. Ground Loop Configuration .......... 28
000906CDG - Circulator Pump Module Installation .............. 29
001823CDG - Dual Flow Pump Module Installation .............. 30
Open Loop Installations ................................................ 31
Well Water Temperature ....................................................... 31
Well Water Flow .................................................................... 31
Well Water Quality ................................................................ 31
Water Discharge Methods .................................................... 31
Table of Contents
Water Valve .......................................................................... 32
Water Flow Control ............................................................... 32
Submersible Pump Selection ................................................ 33
Stage 1 vs. 2 on Open Loop ................................................. 33
Plumbing the Heat Pump ...................................................... 33
Pipe Insulation ...................................................................... 33
000907CDG - Typical Open Loop Installation ....................... 34
001822CDG - Dual Flow Open Loop Installation .................. 35
000619INF - Ground Water Disposal Methods ..................... 36
Ductwork ........................................................................... 37
Duct Systems - General ........................................................ 37
Duct Systems - Grill Layout ................................................... 37
Ducted Air Thermostat Location ........................................... 37
Plenum Heater ....................................................................... 37
002222PDG - Typical Duct & Condensate Connections ........ 38
Duct Sizing Guide .................................................................. 39
Operation ........................................................................... 40
BACnet Control ..................................................................... 40
Air Thermostat Operation ...................................................... 40
Hydronic Temperature Control .............................................. 40
1. Hydronic Heating: Setpoint Control ................................... 40
Setpoint Control Method 1 - Indoor Loop (ICR) ..................... 40
Setpoint Control Method 2 - External (HTS/CTS) ................. 40
Outdoor Reset ...................................................................... 41
2. Hydronic Heating: Signals Control .................................... 41
PC Application (PC App) ............................................... 42
PC Application Menus............................................................ 42
LCD Display & Menus ..................................................... 54
BACnet Interface ............................................................. 56
Startup Procedure ........................................................... 60
Startup Record ...................................................................... 62
General Maintenance ...................................................... 63
Troubleshooting Guide ................................................... 64
Repair Procedures .......................................................... 78
Model Specific Information ........................................... 79
Shipping Information (ATF Indoor Unit) ................................ 79
Refrigerant Charge ............................................................... 79
Required Loop Flow Rates ................................................... 79
Operating Temperature Limits .............................................. 79
Pressure Drop Data .............................................................. 80
Standard Capacity Ratings ................................................... 82
Performance Tables .............................................................. 84
Electrical Specifications ........................................................ 94
Airflow Data .......................................................................... 95
Wiring Diagram (208/230-1-60) ............................................ 96
Electrical Box Layout (208/230-1-60) .................................... 97
Wiring Diagram (208-3-60) ................................................... 98
Electrical Box Layout (208-3-60) ........................................... 99
Wiring Diagram (460-3-60) .................................................. 100
Electrical Box Layout (460-3-60) ......................................... 101
TF-Series Refrigeration Circuit - Air Heating Mode .............. 102
TF-Series Refrigeration Circuit - Air Cooling Mode .............. 103
TF-Series Refrigeration Circuit - Hydronic Heating Mode .... 104
Dimensions .......................................................................... 105
Appendix A: Control Board Description ................... 109
Appendix B: USB Driver Installation ......................... 113
Appendix C: PC App Installation ............................... 114
Appendix D: Updating Firmware ................................ 115
Warranty .......................................................................... 118

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Tables & Documents
Table 1 - Heat Pump Size vs. Heated Area for a Ground Loop System ............................................................. 8
Table 2 - Heat Pump Size vs. Heated Area for an Open Loop System .............................................................. 8
Table 3 - Plenum Heater Sizing ........................................................................................................................... 8
Table 4 - Power Supply Connections ................................................................................................................ 12
Table 5 - Plenum Heater Signal Connections ................................................................................................... 12
Table 6 - Indoor & Outdoor Circulator Connections .......................................................................................... 12
Table 7 - Air Thermostat Connections ............................................................................................................... 13
Table 8 - Hydronic Auxiliary Connections ......................................................................................................... 13
Table 9 - Aquastat (Signals Control) Connections ............................................................................................ 13
Table 10 - Buffer Tank Size ............................................................................................................................... 18
Table 11 - Antifreeze Percentages .................................................................................................................... 26
Table 12 - Volume of Fluid per 100ft. Of Pipe ................................................................................................... 26
Table 13 - Required Flow .................................................................................................................................. 31
Table 14 - Heat Pump Size vs. Hot Air Grills .................................................................................................... 37
Table 15 - Duct Sizing Guide ............................................................................................................................. 39
Table 16 - Typical Temperature Settings .......................................................................................................... 41
Table 17 - BACnet Objects - Control Signals (Read/Write) ............................................................................... 56
Table 18 - BACnet Objects - Operation Mode Description (Read Only) ............................................................ 56
Table 19 - BACnet Objects - Data (Read Only) ................................................................................................. 57
Table 20 - BACnet Objects - Alarm Descriptions (Read Only) ........................................................................... 58
Table 21 - BACnet Objects - Fault Descriptions (Read Only) ............................................................................ 59
Table 22 - Shipping Information ........................................................................................................................ 79
Table 23 - Refrigerant Charge ........................................................................................................................... 79
Table 24 - Required Loop Flow Rates ............................................................................................................... 79
Table 25 - Operating Temperature Limits ......................................................................................................... 79
Table 26 - Loop Pressure Drop Data ................................................................................................................. 80
Table 27 - Standard Capacity Ratings - Ground Loop Heating 60Hz ............................................................... 82
Table 28 - Standard Capacity Ratings - Ground Water Heating 60Hz ............................................................. 82
Table 29 - Standard Capacity Ratings - Ground Loop Cooling 60Hz ............................................................... 82
Table 30 - Standard Capacity Ratings - Ground Water Cooling 60Hz .............................................................. 82
Table 31 - Standard Capacity Ratings - Ground Loop Hydronic Heating 60Hz ................................................ 83
Table 32 - Standard Capacity Ratings - Ground Water Hydronic Heating 60Hz .............................................. 83
Table 33 - TF-Series Electrical Data ................................................................................................................. 94
Table 34 - Plenum Heater Electrical Data ......................................................................................................... 94
Table 35 - Airflow Range for Stage 2 (Full Load) .............................................................................................. 95
Table 36 - Airflow Range for Stage 1 (Part Load) ............................................................................................. 95
Table 37 - Airflow Range for Stage 3 (Auxiliary) ............................................................................................... 95
Table 38 - Airflow Range for Fan Recirculation ................................................................................................. 95
Table 39 - Airflow Range for Emergency .......................................................................................................... 95
Table A1 - Control Board Connector Descriptions (Top) ................................................................................. 110
Table A2 - Control Board Connector Descriptions (Left Side) ....................................................................... 110
Table A3 - Control Board Connector Descriptions (Bottom) ........................................................................... 111
Table A4 - Control Board Connector Descriptions (Right Side) ...................................................................... 112
001915INF - Internal Plenum Heater Installation ............................................................................................... 11
002071CDG - Typical Thermostat Connections to GEN2 Board ....................................................................... 14
002374CDG - Typical TF Auxiliary Heat and Circulator Wiring ......................................................................... 15
002067CDG - Typical Zone and Auxiliary Wiring with GEN2 Setpoint Control (Heating Only) ......................... 16
002069CDG - Typical Zone and Auxiliary Wiring with GEN2 Hardwired Option (Heating Only) ....................... 17
002238PDG - Typical Loop Connections - TF Series ........................................................................................ 19
002366PDG - Recommended Hydronic Buffer Tank Piping .............................................................................. 20
002367PDG - Auxiliary Boiler Piping .................................................................................................................. 21
000530PDG - Typical Zone Types for Hydronic Applications ............................................................................ 22
001055PDG - Single Unit Connection to On-Demand DHW Pre-Heat Tank ..................................................... 23
000970PDG - Desuperheater Connection to DHW Pre-Heat Tank ................................................................... 24
000608INF - Typical Horizontal Ground Loop Configuration ............................................................................. 27
000609INF - Typical Vertical Ground Loop Configuration ................................................................................. 28
000906CDG - Geo-Flo Circulator Pump Module Installation ............................................................................ 29
001823CDG - Dual Flow Circulator Pump Module Installation for 2-Stage Heat Pumps .................................. 30
000907CDG - Typical Ground Water (Open Loop) Installation ......................................................................... 34
001822CDG - Dual Flow Groundwater (Open Loop) Installation for 2-Stage Heat Pumps .............................. 35
000619INF - Ground Water Disposal Methods ................................................................................................. 36
002222PDG - Typical Duct & Condensate Connections - TF Series ................................................................ 38
002368SCH - TF Series Schematic Diagram 208/230-1-60 ............................................................................. 96
002369ELB - TF Series Electrical Box Diagram 208/230-1-60 ......................................................................... 97
002370SCH - TF Series Schematic Diagram 208-3-60 .................................................................................... 98
002371ELB - TF Series Electrical Box Diagram 208-3-60 ................................................................................ 99
002372SCH - TF Series Schematic Diagram 460-3-60 ................................................................................... 100
002373ELB - TF Series Electrical Box Diagram 460-3-60 ............................................................................... 101
001197RCD - TF Series Refrigeration Circuit - Air Heating Mode .................................................................. 102
001198RCD - TF Series Refrigeration Circuit - Air Cooling Mode .................................................................. 103
001199RCD - TF Series Refrigeration Circuit - Hydronic Heating Mode ........................................................ 104
Tables
Documents

Page 6 002362MAN-01 15-Jan-2019
General Overview
The Nordic TF-series, a unique product with a more than
20-year history of reliable operation, is a package water source
heat pump that can heat or cool via a ducted forced air system,
as well as heat water for hydronic applications like in-floor heat-
ing. It is the ground-source or geothermal version of the air
source Nordic ATF-series.
Being a water source, ’geoexchange’, or ‘geothermal’ heat
pump, the TF-series does require either a closed ground loop or
open loop water well for a heat source/sink.
The ducted air heating and cooling functions are controlled
by a standard 3H/2C 24V room thermostat. The hydronic heat-
ing control is done by an internal routine that maintains the buff-
er tank temperature, without external sensors (’Setpoint Con-
trol’). BACnet or an accessory 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 indoor and outdoor loop hydronic heat exchangers are
both heavy duty coaxial copper / steel models with optional Cu-
Ni inner tube available. Most model sizes have modulation ca-
pability through the use of 2-stage compressors, for closer load
matching and to reduce cycling. An Electronic Expansion Valve
(EEV) is standard, for more precise superheat and system opti-
mization than is possible with a TXV. Control is overseen by the
Nordic GEN2 programmable control board, which has many
advanced features like laptop connectivity via the free PC App
software, data logging & graphing, and real time readout from
electronic temperature & pressure sensors. A constant airflow
electronically commutated (ECM) blower motor with adjustable
airflow is standard. The cabinet is powder coated galvanized
sheet metal.
TF System Description
1. Air Heating Mode
In air heating mode, the heat pump heats warm air in a
duct system when heat is called for by the ducted air thermo-
stat. Heat is extracted from the outdoor loop.
If a closed ground loop is used, the pumps are powered
and controlled by the heat pump; if open loop, a water valve is
opened by the heat pump during heating operation and closed
when the heat pump is idle.
2. Hydronic (Water) Heating Mode
In hydronic heating mode, the heat pump heats water in a
buffer tank to a user-adjustable setpoint temperature, while ex-
tracting heat from the outdoor loop. A buffer tank is required, in
order to maintain control over the water temperature and avoid
mismatching between the heat pump’s output and the heat load.
An internal sampling routine and built-in temperature sensors
determine when the buffer tank temperature has fallen below
the user-adjustable setpoint and hydronic heating is required.
If a closed ground loop is used, the pumps are powered
and controlled by the heat pump; if open loop, a water valve is
opened by the heat pump during heating operation and closed
when the heat pump is idle.
Hydronic heating systems are easily zoned, and zones
may be in-floor heating, hydronic air handlers, or other hydronic
devices suitable for water temperatures less than 120°F (49°C).
When a zone requires heat, its zone thermostat calls for a zone
circulator pump or zone valve to activate, so that hot water from
the buffer tank is sent to the zone requiring heat. Note that
there is no direct connection between the zone thermostat and
the heat pump, the functions of each being separated by the
buffer tank.
3. Air Cooling Mode
In air cooling mode, the heat pump cools air through the
duct system when cooling is called for by the ducted air thermo-
stat. Heat is rejected to the outdoor loop.

15-Jan-2019 Page 7 002362MAN-01
Auxiliary Hydronic Heat
If the heating system is fully backed up through the ducted
air system, hydronic backup heat may not be required. If re-
quired, the easiest way to provide hydronic backup is with elec-
tric elements in the buffer tank. Buffer tanks with larger ele-
ments certified for space heating use are available as factory
accessories. Other tanks/elements or other types of devices
may be used.
Hydronic backup heat is controlled as stage 3 by the inter-
nal buffer tank temperature sampling routine mentioned previ-
ously, through a 24VAC signal or dry contacts to the external
device. See details in following sections.
Factory Options
Looking at the front of the heat pump (the side where pip-
ing connections and electrical box are), the unit can be ordered
as a left or right hand air return 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 heat/cool and stage 1 hydronic heat
 both stage 2 air heat/cool and stage 1 hydronic heat
 both stage 1 air heat/cool and stage 2 hydronic heat
 both stage 2 air heat/cool and stage 2 hydronic heat
The unit operates in air heating/cooling mode in stage 2.
SIMULTANEOUS DEMANDS - HYDRONIC PRIORITY:
If there is a call for:
 both stage 1 air heat/cool and stage 1 hydronic heat
 both stage 2 air heat/cool and stage 1 hydronic heat
 both stage 1 air heat/cool and stage 2 hydronic heat
 both stage 2 air heat/cool and stage 2 hydronic heat
The unit operates in hydronic heating mode in stage 2.
Auxiliary Air Heat
While ATF is operating in any mode, auxiliary heat
(normally an electric plenum heater) will also be engaged if the
air temperature drops below the air heat auxiliary (stage 3) set-
point as called for by the ducted air thermostat. Although a ple-
num heater is not required for geothermal heat pumps that are
sized to 100% of the coldest day heat load, it is a good idea to
have one installed.
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 the coldest days, should the geothermal
heat pump be sized to less than 100% of the heat load
(intentionally or not).
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’s
emergency heat circuitry allows the thermostat to call for backup
heat even if the heat pump is locked out on an alarm or the con-
trol board is not operational.
Electric plenum heaters are available as accessories. See
the Sizing, Wiring, and Ductwork sections. These heaters
are normally installed inside the TF 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.
Air Outlet Orientation
The unit can be changed from top to side air discharge in
the field, so no factory specification is required. See Installation
Basics section.
Left Return Right Return

Page 8 002362MAN-01 15-Jan-2019
TF-Series Sizing
Plenum Heater Sizing
Plenum heaters are available as factory accessories in 5,
7, 10, 15 and 20kW sizes. For full backup, choose a size that
covers 100% of the coldest day heat load, according to the heat
loss analysis mentioned in the last section. If that is not availa-
ble, use the following recommendation:
TABLE 3 - 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
80 20 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 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
should be used.
TABLE 1 - Heat Pump Size vs. Heated Area
for a Ground Loop System
Model ft2 m2
45 1400 130
55 2000 185
65 2600 240
75 3100 290
80 3500 325
TABLE 2 - Heat Pump Size vs. Heated Area
for an Open Loop System
Model ft2 m2
45 1800 165
55 2500 230
65 3200 295
75 3800 355
80 4200 390
Heat Pump Sizing
The following table is a rough guideline as to the size of
home each heat pump size can handle for ground loop (closed
loop) installations.
The following table is a rough guideline as to the size of
home each heat pump size can handle for ground water (open
loop) installations.
THE TABLES ABOVE ARE FOR INFORMATION ONLY.
THEY SHOULD NOT BE USED TO SELECT A UNIT SIZE.
They simply show on average what size unit 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
tables account for a basement the same size as the heated ar-
ea.
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. For heating dominant climates, we recommend
sizing the unit to 100% of the heating design load for maxi-
mum long term efficiency with minimal supplementary heat.
The unit should be installed as per CSA standard 448.2-02.
For ground loop applications, the ground loop should be
designed using suitable software with a multi-year analysis.
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.
A heat pump model size can be selected by comparing the
calculated heat load to the standard capacity ratings, which are
listed in the Model Specific Information section of this manual.
For 100% heat pump sizing, choose a heat pump with a stand-
ard capacity rating that matches or just slightly exceeds the cal-
culated heat load.
Closed ground loops are normally designed to reach a
minimum temperature of just below freezing at the end of the
heating season, in order to take advantage of the latent heat of
groundwater (at least in northern climates). Hence, the Stand-
ard Capacity Ratings for Ground Loop Heating should apply in
all northern climates.
The Standard Capacity Ratings for Ground Water (open
loop) heat pumps assume a well water temperature of 50F
(10C). If the groundwater is not close to this temperature, it will
be necessary to consult the more detailed performance tables
later in the section for heat pump output at a different ELT.
In cooling dominant climates, the heat pump should be
similarly sized using the Ground Loop Cooling or Ground Water
Cooling Standard Capacity Ratings. Even in northern heating
dominant climates, it should be ensured that 100% of the
cooling load will be covered when sizing the heat pump,
since there is normally no auxiliary or backup cooling avail-
able.
Note that the ‘triple function’ nature of the heat pump has
no effect on sizing procedure; it should still be sized for the total
load according to the above procedure.

15-Jan-2019 Page 9 002362MAN-01
Installation Basics
Sample Bill of Materials -
Ground Loop Installations
Although not exhaustive, following is a list of materials needed
for a typical ground loop installation:
FROM MARITIME GEOTHERMAL
• TF SERIES HEAT PUMP (L OR R RETURN)
• PLENUM HEATER __kW
• BUFFER TANK, WITH __kW ELEMENTS
• THERMOSTAT (WIFI OR STD)
• P/T PORTS AND HOSE ADAPTERS (2)
• 1 OR 2 PUMP PACK
• PIPE ADAPTERS FOR PUMP PACK
OPTIONAL FROM MARITIME GEOTHERMAL
• ANTI-VIBRATION PAD FOR UNDER UNIT
• SOUND JACKET
• SECURE START
• ELECTROSTATIC FILTER
• AQUASTAT (IF NOT USING SETPOINT CONTROL)
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
HYDRONIC ZONES
• CIRCULATOR PUMP: HEAT PUMP TO TANK
• ZONES CIRCULATOR PUMP(S)
• ZONE TRANSFORMER & CIRC CONTACTOR
• ZONE VALVES (IF NOT INDIVIDUAL PUMPS)
• IN-FLOOR PIPING
• ZONE THERMOSTATS
• ZONE SUPPLY & RETURN HEADERS
• PIPE, FITTINGS, TAPS, BALL VALVES
• EXPANSION TANK
DHW
• PREHEAT TANK, 40 OR 60 GAL
• ½” COPPER PIPE
• ½” FITTINGS, BALL VALVES, BOILER DRAINS, CV
GROUND LOOP
• ¾” PE PIPE
• 1-1/4” PE PIPE
• PE PIPE FITTINGS
• 1” CLEAR / PVC SPA HOSE (HEAT PUMP - PUMP PACK)
• HYDRAULIC HOSE CLAMPS
• ANTIFREEZE: METHANOL OR PROP. GLYCOL
ELECTRICAL
• HEAT PUMP SERVICE WIRE: 6-3 OR 8-3
• PLENUM HEATER SERVICE WIRE
• BUFFER TANK ELEMENT SERVICE WIRE (IF REQ’D)
• HEAT PUMP BREAKER
• PLENUM HEATER / TANK ELEMENT BREAKER
• THERMOSTAT WIRE 18-8
• THERMOSTAT WIRE 18-4 (AQUASTAT)
• THERMOSTAT WIRE 18-2 (PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE
• CONDENSATE PUMP & HOSE (IF REQUIRED)
• 2” STYROFOAM INSUL. (IF PAD NOT PURCHASED)
Sample Bill of Materials -
Open Loop Installations
Although not exhaustive, following is a list of materials needed
for a typical open loop (groundwater) installation:
FROM MARITIME GEOTHERMAL
• TF SERIES HEAT PUMP (L OR R RETURN)
• PLENUM HEATER __kW
• BUFFER TANK, WITH __kW ELEMENTS
• THERMOSTAT (WIFI OR STD)
• P/T PORTS AND HOSE ADAPTERS (2)
• DOLE VALVE
• WATER VALVE (SLOW CLOSING OR SOLENOID)
OPTIONAL FROM MARITIME GEOTHERMAL
• ANTI-VIBRATION PAD FOR UNDER UNIT
• SOUND JACKET
• SECURE START
• ELECTROSTATIC FILTER
• AQUASTAT (IF NOT USING SETPOINT CONTROL)
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
HYDRONIC ZONES
• CIRCULATOR PUMP: HEAT PUMP TO TANK
• ZONES CIRCULATOR PUMPS(S)
• ZONE TRANSFORMER & CIRC CONTACTOR
• ZONE VALVES (IF NOT INDIVIDUAL PUMPS)
• IN-FLOOR PIPING
• ZONE THERMOSTATS
• ZONE SUPPLY & RETURN HEADERS
• PIPE, FITTINGS, TAPS, BALL VALVES
• EXPANSION TANK
DHW
• PREHEAT TANK, 40 OR 60 GAL
• ½” COPPER PIPE
• ½” FITTINGS, BALL VALVES, BOILER DRAINS, CV
WATER SYSTEM
• 1” BLACK PLASTIC WATER PIPE
• 1” BARBED FITTINGS & HYD. HOSE CLAMPS
• SUBMERSIBLE PUMP (IF NOT EXISTING)
• PRESSURE TANK (IF NOT EXISTING)
• CYCLE STOP VALVE (OPTIONAL)
ELECTRICAL
• HEAT PUMP SERVICE WIRE: 6-3 OR 8-3
• PLENUM HEATER SERVICE WIRE
• BUFFER TANK ELEMENT SERVICE WIRE (IF REQ’D)
• HEAT PUMP BREAKER
• PLENUM HEATER / TANK ELEMENT BREAKER
• THERMOSTAT WIRE 18-8
• THERMOSTAT WIRE 18-4 (AQUASTAT)
• THERMOSTAT WIRE 18-2 (PLENUM HEATER)
• FORK TERMINALS FOR TSTAT WIRE
• CONDENSATE PUMP & HOSE (IF REQUIRED)
• 2” STYROFOAM INSUL. (IF PAD NOT PURCHASED)

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Unpacking the Unit
When the 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.
Unit Placement
Ducted or forced air heat pumps should be centrally located
in the home with respect to the conditioned space. This provides
the best in economy and comfort and usually can be
accomplished in harmony with the design of the home. A
heating system cannot be expected to produce an even warmth
throughout the household when it is located at one end of the
structure and the heated or cooled 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 2 ft (0.7 m) 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.
The heat pump comes equipped with an air filter rack
which can be installed with the removable end (where the filter
is inserted) on either side to facilitate changing the filter. 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.
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.
Air Outlet Orientation
The unit has a field configurable blower position, resulting
in top or side air discharge. 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 air-
flow. 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.
Top Discharge
(Internal Plenum Heater)
Side Discharge
(External Plenum Heater)
Air Return Orientation
The heat pump can be ordered as left or right return from
the factory. This must be specified at time of order as the physi-
cal construction of the two configurations is different. Refer to
the Dimensions section toward the end of this manual for physi-
cal dimensions of the units.

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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 4 - 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* (optional)
460-3-60, 380-3-50 (required)
Power Supply Connections
Power supply for the heat pump from the breaker panel is
supplied to the unit via concentric 1.093” / 0.875” knockouts.
There are also several 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 indoor / outdoor loop circula-
tors.
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
There are 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, or when sam-
pling water temperature. Connect the circulator pump to the
appropriate two terminals (115V or 230V) of the terminal strip
marked Indoor Circulators, as per the voltage of the circulator
pump. 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 electri-
cal 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 & Outdoor Circulator Connections
Terminal Description
115V Connection for 115V circulator
115V
230V
230V
Use a 2-conductor 14ga cable.
Connection for 230V circulator
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
the size of wire for the connections, as well as the recommend-
ed breaker size.
Auxiliary Plenum Heater:
Signal Connections
There are 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 in-
tended to activate equipment that has its own 24VAC transform-
er; if equipment does not have its own transformer, one will
need to be installed in an external electrical box.
Connect the terminals on the heat pump terminal strip to
the matching terminals on the plenum heater’s control board
using an 18-3 cable.
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.
Outdoor Loop Pump Module Wiring
(Ground Loop Only)
There are provisions for connecting the ground loop circu-
lator pump module so that the pumps will be turned on whenev-
er the compressor operates. Connect the circulator pump mod-
ule to the appropriate two terminals (115V or 230V) of the termi-
nal strip marked Outdoor Circulators in the heat pump, as per
the voltage of the circulator 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 STAGE 1 terminal on the bottom side of the
control board and the C (24V ground) terminal.
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.

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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 con-
trol 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 7 - 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 AR to 24VAC with a
dry contact to reduce the airflow for zoning. Con-
nections located on right side of control board.
24VAC
TABLE 9 - 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)
Ducted 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 heat pump electrical box. 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, so no aquastat is re-
quired. However, an aquastat or aquastats can be used if re-
quired, for example if heating two loops with different setpoint
temperatures. This is called Signals or Hardwired Control.
The wiring connections are at the top right of the control
board, on the screw terminal connector section marked AQ-
UASTAT. 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.
Domestic Hot Water (Desuperheater)
The desuperheater function for domestic hot water heating
is pre-wired and no field connections are necessary.
After the desuperheater is filled with water and purged of
air, activate the built-in DHW circulator by connecting the brown
wire with the blue insulated terminal to L1 of the compressor
contactor as shown on the wiring diagram in the Model Specific
Information section. Ensure the power is off when connect-
ing the wire. Also, turn on the DHW ON/OFF switch.
Open/Closed Loop Wiring
The heat pump is provided configured for closed loop op-
eration. For open loop operation, it is necessary to remove the
jumper plug from the wiring harness found behind the pipe post
and plug in the water valve harness. This will select the proper
low pressure control. See the “Water Valve” section in the Open
Loop Installations chapter and 000907CDG for details.
WARNING: Connecting an open loop water
valve without a harness provided by Maritime
Geothermal could lead to frozen and rup-
tured heat exchanger, voiding the warranty.
contactor in order to operate hydronic auxiliary heat. Choose
this method if using a heating device that doesn’t have its own
electronic controller or control transformer, e.g. a bare heating
element in the buffer tank. This signal can provide a maximum
of 500mA at 24VAC.
Second, a dry contact on terminals D1 and D2 is available,
to actuate a heating device that has its own control transformer.
In general, these types of devices will have their own electronic
temperature controller. Therefore, it will be necessary to set the
on-board temperature control on the external heating device
only so that it is a high limit, and it will be activated by the heat
pump’s controller when required for stage 3 heat. This method
should be used for the Thermo2000 EcoUltra tank that is
available from Maritime Geothermal as an accessory.
If not using Setpoint Control, backup device may use its
own controls, provided they are accurate (i.e. devices with a
digital controller). Setpoint should be set lower than stage 2. Or
stage 2 of the aquastat with a delay timer may be used.
TABLE 8 - Hydronic Auxiliary Connections
Signal Description
CA 24VAC common (ground)
1A Hydronic Auxiliary (hot)
D1 Hydronic Auxiliary dry contacts
D2
Hydronic Backup Wiring
When using Setpoint Control, there are two methods for
activating a hydronic backup/auxiliary heating device.
First, a 24VAC control signal on terminal 1A (with CA as
ground/common) is available to power the coil of an external

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Indoor Loop
The connections for the Indoor Loop circuit are 1”
brass female NPT. They are labelled as INDOOR IN and
INDOOR OUT.
Use of a buffer tank is mandatory, in order to maintain con-
trol over water temperature, and to avoid safety control tripping
problems associated with mismatching of heat pump output and
zone absorption. Typical systems using 4 port and 2 port buffer
tanks are shown in following drawing 002366PDG . This dia-
gram shows all of the recommended components as well as
where they should be placed, whether using zone valves or
zone pumps.
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. The following table
shows the minimum buffer tank size for each heat pump along
with the recommended size. The recommended size will mini-
mize the number of starts per hour and provide longer runtimes
for improved 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 piped 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 10 - Buffer Tank Size
Heat Pump Size Minimum Size
gallons (Litres)
Recommended Size
gallons (Litres)
45 24 (90) 50 (190)
55 32 (120) 70 (265)
65 40 (150) 70 (265)
80 52 (200) 70 (265)
If a tank size is not available, use the next size larger tank.
75 48 (180) 70 (265)
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. There is an alarm for conden-
sate overflow, which will disable unit operation.
Outdoor Loop
The connections for the Outdoor Loop circuit are 1”
brass female NPT. They are labelled as OUTDOOR IN and
OUTDOOR OUT.
See the following chapters for details on ground loop and
open loop installations.

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