Return and Supply Air Duct System
Installation & Operations Manual
Maintain supply
Supply Air
flange duct size
12” minimum
YT MODELS PACKAGED for
WATER-TO-AIR
MULTI-POSITIONAL HEAT PUMPS
vertical height
Flex Connector
Flex Connector
Return Air
Equipment Pad
2” Polyethylene Foam
Scan or Click
Here for YouTube
InstallationVideo
IOM, YT Models
1
REVISION:A
20D218-01NN
20D218-01NN
Enertech Global
Table of Contents
SECTION 1: MODEL NOMENCLATURE & AHRI PERFORMANCE DATA
Nomenclature Decoder....................................................................................................................... 4
AHRI Performance Data....................................................................................................................... 4
SECTION 2: INSTALLATION INTRODUCTION
Introduction............................................................................................................................................ 5
Un-packaging ....................................................................................................................................... 5
Pre-Installation........................................................................................................................................ 6
Components.......................................................................................................................................... 6
Master Contactor: Energizes Compressor and optional Hydronic Pump and/or Desuperheater
package................................................................................................................................................. 6
SECTION 3: INSTALLATION CONSIDERATIONS
Consumer Instructions .......................................................................................................................... 7
Unit Placement....................................................................................................................................... 8
Typical Supply and Return Ductwork Connections............................................................................ 9
SECTION 4: UNIT DATA INFORMATION
Dimensional Data and Installation Clearances................................................................................ 10
Unit Dimensional Data......................................................................................................................... 10
Side and Back Discharge Dimensional Data.................................................................................... 11
ECM Fan Performance - Two-Stage Compressor Units.................................................................... 12
Unit Physical Data................................................................................................................................ 12
Unit Electrial Data................................................................................................................................ 14
SECTION 5: GENERAL UNIT ASSEMBLY
Pre-Installation Checklist..................................................................................................................... 15
Field Selectable Return Air Pattern.................................................................................................... 15
Control Box Installation........................................................................................................................ 16
Return Duct Flange Kit Installation..................................................................................................... 21
Optional Filter Rack Kit Installation..................................................................................................... 21
SECTION 6: UNIT PIPING INSTALLATION
Water Quality....................................................................................................................................... 23
Interior Piping........................................................................................................................................ 24
Condensation Drain Connection....................................................................................................... 24
Typical Pressurized Flow Center Installation...................................................................................... 24
Flushing & Charging a Pressurized Flow Center................................................................................ 24
Pressurized Flow Center and Pump Mounting.................................................................................. 26
Typical Non-Pressurized Flow Center Installation.............................................................................. 29
Antifreeze Overview ........................................................................................................................... 30
Antifreeze Charging............................................................................................................................ 31
APSMA Pump Sharing Module .......................................................................................................... 33
Open Loop Piping and Connections................................................................................................ 34
SECTION 7: DESUPERHEATER INSTALLATION
Desuperheater Installation.................................................................................................................. 36
Desuperheater Installation with Single Water Heater...................................................................... 38
Desuperheater Installation with Preheat Tank.................................................................................. 38
SECTION 8: AUXILIARY HEATER INSTALLATION
Auxiliary Heater Nomenclature Decoder.......................................................................................... 39
SECTION 9: ELECTRICAL CONNECTIONS
High and Low Voltage Single Phase Connections........................................................................... 44
Enertech Global
2
IOM, YT Models
SECTION 10: CONTROLS
Microprocessor Features and Operations......................................................................................... 45
Safety Controls..................................................................................................................................... 46
Temperature Sensor Operating Range............................................................................................. 47
Fault Retry............................................................................................................................................. 47
LED Identification................................................................................................................................. 48
Diagnostics:.......................................................................................................................................... 49
Sequence of Operation: .................................................................................................................... 49
Factory Installed Soft Start Option...................................................................................................... 50
SECTION 11: SOFT START CONTROLS
Soft Start Module ................................................................................................................................. 51
Wiring Diagram.................................................................................................................................... 51
Mode of Operation............................................................................................................................. 52
Mode of Operation (Voltage Interuptions)....................................................................................... 54
Mode of Operation (Voltage Dips).................................................................................................... 55
LED Status Indication........................................................................................................................... 56
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, W/O DSH 208/230V 60Hz, Single Phase, Residential........................................... 57
Two Stage, ECM, DSH, 208/230V, 60Hz, Single Phase, Residential/Commercial........................... 58
Two Stage, ECM, 208/230V,60Hz, Single Phase, Commercial......................................................... 59
Two Stage, ECM, 208/230V, 60Hz, Three Phase, Commercial......................................................... 60
Two Stage, ECM, DSH, 208/230V, 60Hz, Three Phase, Commercial................................................ 61
Two Stage, ECM, 460V, 60Hz, Three Phase, Commercial................................................................. 62
Two Stage, ECM, DSH, 460V, 60Hz, Three Phase, Commercial........................................................ 63
Two Stage, ECM, DSH, 208/230V 60Hz, Single Phase, Residential/Commercial............................ 64
SECTION 13: EQUIPMENT START-UP PROCEDURES
Equipment Start-Up Process................................................................................................................ 65
Equipment Start-Up Form.................................................................................................................... 66
Heat of Extraction/Heat of Rejection Tables..................................................................................... 67
Performance Check............................................................................................................................ 67
Pressure Drop Tables............................................................................................................................ 68
SECTION 14: TROUBLESHOOTING
QR Codes for Installation or Troubleshooting Tip Videos................................................................. 69
Operating Parameters........................................................................................................................ 70
Compressor Troubleshooting.............................................................................................................. 71
Refrigeration Troubleshooting............................................................................................................. 72
Superheat/Subcooling Conditions..................................................................................................... 72
Troubleshooting Worksheet................................................................................................................. 73
Troubleshooting Tips............................................................................................................................. 74
SECTION 15: WARRANTY FORMS
Claim Form........................................................................................................................................... 77
Registration Form................................................................................................................................. 78
IOM, YT Models
3
Enertech Global
SECTION 1: MODEL NOMENCLATURE & AHRI PERFORMANCE DATA
Nomenclature Decoder
AHRI Performance Data
GROUND LOOP HEAT PUMP
MODEL
Full Load Cooling
Full Load Heating
Part Load Cooling
Part Load Heating
Btu/hr
EER
Btu/hr
COP
Btu/hr
EER
Btu/hr
COP
YT024
27,100
19.9
19,000
4.3
21,400
28.2
15,200
4.8
YT036
41,200
20.9
29,100
4.5
31,500
31.3
23,300
5.1
YT048
53,300
20.2
39,900
4.3
42,600
29.6
32,000
4.9
YT060
64,300
19.3
49,200
4.1
50,000
28.0
37,700
4.6
YT072
71,900
18.0
56,200
3.8
58,500
24.8
45,800
4.4
GROUND WATER HEAT PUMP
MODEL
Full Load Cooling
Full Load Heating
Part Load Cooling
Part Load Heating
Btu/hr
EER
Btu/hr
COP
Btu/hr
EER
Btu/hr
COP
YT024
29,200
25.7
23,400
5.3
22,200
33.6
17,500
5.5
YT036
44,300
27.0
37,500
5.5
32,700
37.4
26,600
5.8
YT048
57,100
26.2
49,500
5.2
44,100
35.3
35,900
5.5
YT060
68,700
24.8
61,700
4.9
51,900
33.4
42,900
5.2
YT072
77,600
23.2
71,100
4.6
60,800
29.5
52,100
4.8
Note:
Rated in accordance with ISO Standard 13256-1 which includes Pump Penalties.
Heating capacities based on 68.0°F DB, 59.0°F WB entering air temperature.
Cooling capacities based on 80.6°F DB, 66.2°F WB entering air temperature.
GLHP - Entering water temperatures Full Load: 32°F heating / 77°F cooling.
GLHP - Entering water temperatures Part Load: 41°F heating / 68°F cooling.
GWHP - Entering water temperatures: 50°F heating / 59°F cooling.
Enertech Global
4
IOM, YT Models
SECTION 2: INSTALLATION INTRODUCTION
Introduction
This geothermal heat pump provides heating
and cooling as well as optional domestic water
heating capability. Engineering and quality
control is built into every geothermal unit. Good
performance depends on proper application
and correct installation. All YT Models do not
have more than 2% air leakage
⚠ NOTICE ⚠
PRIOR TO OPERATING THE UNIT, REMOVE AND
DISCARD THE BLOWER MOTOR ARMATURE
SUPPORT BRACKET LOCATED ON THE BACK
OF THE BLOWER. IF APPLICABLE, REMOVE
AND DISCARD THE BLOWER SHIPPING
BRACKET LOCATED ON THE BOTTOM OR SIDE
OF THE BLOWER HOUSING.
Notices, Cautions, Warnings, & Dangers
“NOTICE” Notification of installation, operation
or maintenance information which is important,
but which is NOT hazard-related.
FAILURE TO REMOVE THESES BRACKETS
COULD RESULT IN NOISY OPERATION AND
EQUIPMENT DAMAGE.
“CAUTION” Indicates a potentially hazardous
situation or an unsafe practice which, if not
avoided, COULD result in minor or moderate
injury or product or property damage.
⚠ CAUTION ⚠
“WARNING” Indicates potentially hazardous
situation which, if not avoided, COULD result in
death or serious injury.
ALL GEOTHERMAL EQUIPMENT UNLESS
SPECIFIED “OUTDOOR” IS DESIGNED FOR
INDOOR INSTALLATION ONLY. DO NOT
INSTALL OR STORE UNIT IN A CORROSIVE
ENVIRONMENT OR IN A LOCATION WHERE
TEMPERATURE AND HUMIDITY ARE SUBJECT TO
EXTREMES.
USE OF EQUIPMENT NOT CERTIFIED AND
MARKED FOR OUTDOOR APPLICATION WILL
VOID ALL WARRANTIES.
“DANGER” Indicates an immediate hazardous
situation which, if not avoided, WILL result in
death or serious injury.
Inspection:
Upon receipt of any geothermal equipment,
carefully check the shipment against the
packing slip and the freight company bill of
lading. Verify that all units and packages have
been received. Inspect the packaging of
each package and each unit for damages.
Insure that the carrier makes proper notation of
any and all damages or shortage on all bill of
lading papers. Concealed damage should be
reported to the freight company within 15 days.
If not filed within 15 days the freight company
can deny all claims.
⚠ WARNING ⚠
FAILURE TO FOLLOW THIS CAUTION MAY
RESULT IN PERSONAL INJURY. USE CARE AND
WEAR APPROPRIATE PROTECTIVE CLOTHING,
SAFETY GLASSES AND PROTECTIVE GLOVES
WHEN SERVICING UNIT AND HANDLING
PARTS.
Note: Notify Enertech Global’s shipping
department of all damages within 15 days. It
is the responsibility of the purchaser to file all
necessary claims with the freight company.
⚠ CAUTION ⚠
BEFORE DRILLING OR DRIVING ANY SCREWS
INTO CABINET, CHECK TO BE SURE THE
SCREW WILL NOT HIT ANY INTERNAL PARTS OR
REFRIGERANT LINES.
IOM, YT Models
Un-packaging
Enertech units are mounted to wooden
pallets for easy handling during shipment and
installation. Units are protected during shipment
with durable cardboard corner posts, top and
5
Enertech Global
SECTION 2: INSTALLATION INTRODUCTION
air coil panels. Shrink wrap is applied covering
the entire unit and attachment to the pallet.
Upon receipt of the unit carefully remove the
shrink wrap. Using a box cutter slit the shrink
wrap on the cardboard top and corner posts.
Use caution to not damaged the finished
surface of the unit. Keep all cardboard or
other packaging material for safe storage and
transport to the job site prior to installation.
between the ductwork and the unit. All units
should be located in an indoor area where
the ambient temperature will remain above
55°F and should be located in a way that
piping and ductwork or other permanently
installed fixtures do not have to be removed
for servicing and filter replacement.
Pre-Installation Steps:
1. Compare the electrical data on the unit
nameplate with packing slip and ordering
information to verify that the correct unit
has been shipped.
Remove the front compressor section service
panel to locate technical documents; manuals,
bulletins or instructions and accessory items;
HWG piping kits, supply/return duct flange kits
or condensate tubing kits prior to installation.
Unit Protection:
Protect units from damage and contamination
due to plastering (spraying), painting and
all other foreign materials that may be used
at the job site. Keep all units covered on the
job site with either the original packaging or
equivalent protective covering. Cap or recap
unit connections and all piping until unit is
installed. Precautions must be taken to avoid
physical damage and contamination which
may prevent proper start-up and may result in
costly equipment repair.
Storage:
All geothermal units should be stored inside in
the original packaging in a clean, dry location.
Units should be stored in an upright position
at all times. Units should not be stacked unless
specially Noted on the packaging.
Removal and Disposal
Geothermal units removed from service should
have all components, oils, antifreeze and
refrigerants properly disposed of according to
all local and national environmental recycling
codes, regulations, standards and rules.
Remove any packaging used to support or
hold the blower during shipping. Remove
and discard the blower support bracket
(if equipped) and motor armature shaft
shipping bracket from the rear of the
blower.
3.
Remove and discard the air coil protective
shipping cover (if eqipped).
4.
Inspect all electrical connections and
wires. Connections must be clean and
tight at the terminals, and wires should not
touch any sharp edges or copper pipe.
4.
Verify that all refrigerant tubing is free of
dents and kinks. Refrigerant tubing should
not be touching other unit components.
5.
Before unit start-up, read all manuals and
become familiar with unit components
and operation. Thoroughly check the unit
before operating.
6.
Determine discharge and return air
patterns prior to unit assembly and
installation
⚠ CAUTION ⚠
DO NOT OPERATE THE GEOTHERMAL
HEAT PUMP UNIT DURING BUILDING
CONSTRUCTION PHASE.
Pre-Installation
Special care should be taken in locating
the geothermal unit. Installation location
chosen should include adequate service
clearance around the unit. All vertical units
should be placed on a formed plastic air pad,
or a high density, closed cell polyethylene
pad slightly larger than the base of the unit.
Flex connectors should also be installed in
Enertech Global
2.
Components
Master Contactor: Energizes Compressor
and optional Hydronic Pump and/or
Desuperheater package.
Logic Board: Logic Board operates the
compressor and protects unit by locking out
6
IOM, YT Models
SECTION 2: INSTALLATION INTRODUCTION
when safety switches are engaged. It also
provides fault indicator(s).
Because of the importance of proper installation,
Enertech Global does not sell equipment direct
to homeowners. Internet websites and HVAC
outlets may allow for purchases directly by
homeowners and do-it-yourselfers, but Enertech
Global offers no warranty on equipment that is
purchased via the internet or installed by persons
without proper training.
Terminal Strip: Provides connection to the
thermostat or other accessories to the low
voltage circuit.
Transformer: Converts incoming (source)
voltage to 24V AC.
Low Voltage Breaker: Attached directly to
transformer, protects the transformer and low
voltage circuit.
Enertech Global has set forth this policy
to ensure installations of Enertech Global
geothermal systems are done safely and
properly. The use of well-trained, qualified
technicians helps ensure that your system
provides many years of comfort and savings.
Reversing Valve: Controls the cycle of the
refrigerant system (heating or cooling).
Energized in cooling mode.
High Pressure Switch: Protects the refrigerant
system from high refrigerant pressure, by locking
unit out if pressure exceeds setting.
Equipment Installation: Special care should
be taken in locating the unit. All vertical units
should be placed on a vibration absorbing pad
(air pad) slightly larger than the base of the
unit. Flex connectors should also be installed in
between the ductwork and the unit. All units
should be located in an indoor area were the
ambient temperature will remain above 55°F
and should be located in a way that piping
and ductwork or other permanently installed
fixtures do not have to be removed for servicing
and filter replacement.
Low Pressure Switch: Protects the refrigerant
system from low suction pressure, if suction
pressure falls below setting.
Electric Heater: Provides auxiliary heat during
cold temperatures and provides electric
backup if unit malfunctions.
Blower Motor (ECM): ECM (Electronically
Commutated Motor) for variable fan speeds.
Compressor (Copeland Scroll): Pumps
refrigerant through the heat exchangers and
pressurizes the refrigerant, which increases the
temperature of the refrigerant.
Electrical: All wiring, line and low voltage,
should comply with the manufacturer's
recommendations, The National Electrical
Code, and all local codes and ordinances.
SECTION 3: INSTALLATION CONSIDERATIONS
Thermostat: Thermostats should be installed
approximately 54 inches off the floor on an
inside wall in the return air pattern and where
they are not in direct sunlight at anytime.
Consumer Instructions
Dealer should instruct the consumer in proper
operation, maintenance, filter replacements,
thermostat and indicator lights. Also provide
the consumer with the manufacturer’s Owner's
Manual for the equipment being installed.
Loop Pumping Modules: Must be wired to the
heat pump’s electric control box. A special
entrance knockout is provided below the
thermostat entrance knockout. A pump
module connection block, connected to
the master contactor, and circuit breaker is
provided to connect the Pump Module wiring.
Enertech Global D-I-Y Policy: Enertech
Global’s geothermal heat pumps and system
installations may include electrical, refrigerant
and/or water connections. Federal, state and
local codes and regulations apply to various
aspects of the installation. Improperly installed
equipment can lead to equipment failure and
health/safety concerns. For these reasons, only
qualified technicians should install a Enertech
Global built geothermal system.
IOM, YT Models
Desuperheater Package: Water heating is
standard on all residential units (units may be
ordered without). It uses excess heat, during
both heating and cooling cycles, to provide
hot water for domestic needs. A double wall
7
Enertech Global
SECTION 3: INSTALLATION CONSIDERATIONS
desuperheater exchanger (coil) located Return and
The
use ofAir
conrner
alone is not
Supply
Duct pads
System
between the compressor and the reversing
recommended.
valve, extracts superheated vapor to heat
3. The installer has verified that all applicable
domestic water; while satisfying its heating and
Maintain supply
wiring, ductwork,
piping, and
accessories
Return Air
Supply
Air
cooling needs. The water circulation
pump
flange
are correct
andduct
onsize
the job site.
for 12” minimum
comes pre-mounted in all residential units, but
4.
Determine
left orheight
right side return
air pattern
vertical
Flex
must be electrically connected
toConnector
the master
Flex Connector
prior
to
unit
assembly
and
installation
contactor. Leaving it unconnected ensures that
the pump is not run without a water supply.
The Desuperheater package can make up to
60% (depending on heat pump usage) of most
domestic water needs, but a water heater is still
recommended.
Desuperheater Piping: All copper tubes & fittings
should be 5/8” O.D (1/2” nom) minimum with a
maximum of 50ft separation. Piping should be
insulated with 3/8” wall closed cell insulation.
Note: Copper is the only approved material for
desuperheater piping.
UV Light Usage:
The use of a UV light in the unit return air plenum
should be such that the light does not have
a direct line of sight to the air coil of the unit.
UV lights could cause internal wiring, foam
insulation, or other components to deteriorate.
It would be better to place the UV light in
the supply air plenum, or ductwork. This also
helps keep the light cleaner. Additionally, if a
humidifier is installed and in line of the sight of
the UV light, consult the humidifier install manual
for indication of whether the light will deteriorate
any parts of the humidifier (like the pad).
Unit Placement
When installing a geothermal heating and
cooling unit, there are several items the installer
should consider before placing
the equipment.
1.
Service Access and Installation Space. Is
there enough space for service access?
A general rule of thumb is at least 2 to
2 1/2 feet on the front and air coil sides
depending on return ductwork size.
2.
Unit Air Pad. All vertical geothermal
heating and cooling equipment should be
placed on either a formed plastic air pad,
or a high density, closed cell polyethylene
pad. This helps eliminate vibration noise
that could be transmitted through the floor.
Enertech Global
Equipment Pad
2” Polyethylene Foam
8
IOM, YT Models
SECTION 3: INSTALLATION CONSIDERATIONS
DUCT WORK
All new ductwork shall be designed as
outlined in Sheet Metal and Air Conditioning
Contractors National Association (SMACNA)
or Air Conditioning Contractors of America
(ACCA) or American Society of Heating,
Refrigerating and Air Conditioning Engineers
(ASHRAE) handbooks. All YT Models do not
have more than 2% air leakage
Typical Supply and Return Ductwork
Connections
Return and Supply Air Duct System
Return Air
Flex Connector
All supply/return plenums should be isolated
from the unit by a flexible connector (canvas)
or equivalent to prevent transfer of vibration
noise to the ductwork. The flex connector
should be designed so as not to restrict airflow.
Turning vanes should be used on any transition
with airflow over 500 CFM. All metal ductwork
should be insulated on the inside to prevent
heat loss/gain, condensation and to absorb air
noise. If the unit is being installed with existing
ductwork, the ductwork must be designed
to handle the air volume required by the unit
being installed. When running a cooling or
heating load on a building, size ductwork
accordingly to the building design load and
heat pump CFM.
Maintain supply
flange duct size
for 12” minimum
vertical height
Supply Air
Flex Connector
Industry Standard: When sizing ductwork use
400 CFM per Ton.
As a general rule, maximum recommended
face velocity for a supply outlet used in a
residential application is 750 FPM. Maximum
recommended return grille velocity is 600 FPM.
Systems with higher velocity, are likely to have
noise problems.
Equipment Pad
2” Polyethylene Foam
In buildings where ceilings are 8 feet or more,
at least 50 percent of the return air should be
taken back to the heat pump from the ceiling
or high sidewall location and not more than 50
percent from the floor or low sidewall location.
Table 1: Maximum Air Velocities
Location
Supply
Return
Main Ducts
900 FPM
600 FPM
Grills, Registers, Diffusers
750 FPM
600 FPM
Branch Ducts
IOM, YT Models
700 FPM
600 FPM
9
Enertech Global
REVISION HISTORY
REV
DESCRIPTION
ECN
15-181-N13
A
ADD
YT024
INFORMATION
Dimensional Data and Installation Clearances
SECTION 4: UNIT DATA INFORMATION
H
P
N
R
DATE
6/22/15
1.00
APPROVED
BDL
K
M
L
E
E
J
Enertech Recommends a Minimum of
2 to 2.5 Feet of Service/Installation
Access at Front and Air Coil Side
TOP VIEW
Showing Optional Filter Rack
TOP VIEW
C
E
B
G
1.00
HWG
WATER IN
SOURCE
WATER OUT
A2
HWG
WATER OUT
SOURCE
WATER IN
T
D
U
LEFT VIEW
F
Y
X
S
A1
W
Z




FRONT VIEW
Unit Dimensional Data
With
Control
Box
A1
*B
C
A2
D
024
46.0 23.0 26.5 53.25 25.0
036-048 54.0 25.4 30.5 61.2 28.0
060-072 58.4 25.4 30.5 65.6 32.0
Model
Model
Without Control
Box
Source Water
S
T
U
024
8.28 13.63 9.63
036-048 8.41 14.73 9.63
060-072 5.56 12.21 9.63
Drain
Ht.
W
9.0
9.0
12.2

Enertech Global
Supply Air Flange
Return Air Flange
E
20.0
26.0
26.0
F
19.1
23.7
24.0
G
1.92
2.34
2.34
H
3.63
2.25
2.25
J
11.62
16.0
16.0
K
12.5
16.0
16.0
L
7.44
7.26
7.26
Optional Filter Rack
M
1.05
1.60
1.60
N
2.34
2.34
2.34
P
3.00
3.29
3.29
R
3.63
2.25
2.25
HWG Water
Notes:
Source water loop - residential models use 1" double
X
Y
Z
o-ring fittings, commercial models use 1" FPT fittings.
All measurements are in inches.
10.31 14.75 6.00
11.44 17.44 6.00
All Desuperheater (HWG) connections are 3/4" FPT fittings.
14.63 17.88 6.00
Electrical connect. are 1" for high voltage, 1/2" for low voltage.
*B (Unit Width) excludes field installed factory supplied
G:\Drafting\Drawings\Released-Production\PDF\20D800-01NN
REVA flanges.
10
IOM, YT Models
REVISION HISTORY
REV
DESCRIPTION
ECN
SECTION 4: UNIT DATA INFORMATION
15-255-N01
A
ADD SIDE-BACK DISCH
DATE
9/21/15
APPROVED
BDL
Side and Back Discharge Dimensional Data
CONFIGURED AS
SIDE DISCHARGE
16.0
CONFIGURED AS
BACK DISCHARGE
4.70
TYP.
7.25
TYP.
6.56
6.56
16.0
16.0
16.0
Note:
Side and Back Discharge configurations are only available in 036 through 072 models.
SIDE DISCHARGE

IOM, YT Models
BACK DISCHARGE
G:\Drafting\Drawings\Released-Production\PDF\20D800-14NN
REVAGlobal
Enertech
11
SECTION 4: UNIT DATA INFORMATION
ECM Fan Performance - Two-Stage Compressor Units
*YT Series ECM Blower Performance Data: Two‐Stage Compressor Units
Dehumidification Max
Heating Mode
Cooling Mode
Mode
Model
ESP
Program3
2
1st
2nd
1st
2nd
1st
2nd
in. w.c.
A
790
1100
780
1040
670
880
024
1.4
036
1.1
048
1.1
060
1.2
072
1.2
520
AUX/
EMG
Heat
1230
B
780
1010
770
1030
650
840
450
1190
ON OFF OFF OFF ON OFF OFF OFF
C
D
A
670
640
1250
900
840
1520
670
650
1230
890
840
1560
510
480
1070
760
710
1330
420
410
760
1130
1100
1760
OFF ON OFF OFF OFF ON OFF OFF
ON ON OFF OFF ON ON OFF OFF
ON OFF ON OFF ON OFF OFF OFF
B
1130
1380
1130
1420
970
1210
690
1480
ON OFF OFF OFF ON OFF OFF OFF
C
D
A
1030
930
1570
1240
1130
1970
1010
930
1680
1280
1170
1880
870
800
1440
1080
990
1590
620
500
930
1310
1210
2020
ON OFF OFF ON ON OFF OFF OFF
ON ON OFF OFF ON ON OFF OFF
OFF OFF ON OFF OFF OFF OFF OFF
B
1420
1790
1530
1710
1310
1440
850
1880
OFF OFF OFF OFF OFF OFF OFF OFF
C
D
A
1280
1090
1870
1600
1370
2160
1380
1280
1800
1540
1420
2170
1180
1090
1500
1290
1200
1825
770
690
1050
1690
1500
2380
OFF OFF OFF ON OFF OFF OFF OFF
ON OFF OFF OFF ON OFF OFF OFF
OFF OFF ON OFF OFF OFF OFF OFF
B
1680
1960
1610
1960
1370
1660
950
2170
OFF OFF OFF OFF OFF OFF OFF OFF
C
D
A
1500
1220
‐
1750
1440
‐
1450
1300
‐
1770
1580
‐
1230
1490
‐
‐
850
740
‐
1950
1690
‐
OFF OFF OFF ON OFF OFF OFF OFF
OFF ON OFF OFF OFF ON OFF OFF
‐
‐
‐
‐
‐
‐
‐
‐
B
1870
2160
1800
2170
1500
1830
1050
2390
OFF OFF ON OFF OFF OFF OFF OFF
C
D
1680
1500
1960
1750
1610
1450
1960
1770
Fan Only
950
850
2180
1960
DIP Switch Settings
S1 S2 S3 S4 S5 S6 S7 S8
OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF ON OFF OFF OFF OFF
Notes:
1. Program B (Bold Type) is factory settings and rated CFM. CFM is controlled within 5% up to the Max ESP.
2. Max ESP includes allowance for wet coil and NO FILTER
3. Power must be off to the unit for at least 3 seconds before the ECM motor will recognize a program change.
4. Max ESP for *YT024 models with internal electric heat is 0.5"; for *YT036 and *YT048 it is 0.6"; for *YT060 and *YT072 it is 0.7". Exceeding the Max ESP may result in nuisance trips of the electric heat. Thermal limits are rated at 100,000 cycles.
5. *YT060 models with 10kW internal electric heat cannot be set on the 'D' program.
*YT Series Dehumidification Mode Options
DIP Switch
Operation
Mode
S9
S10
ON
OFF
Normal
Dehumidification mode disabled (Normal Htg/Clg CFM)‐‐ Factory setting.
On Demand Dehumidification mode (humidistat input at terminal ODD)‐‐ Humidistat ODD
OFF
ON
required.
Constant Dehumidification mode (always uses dehum CFM for cooling and normal CFM for Constant Dehum
OFF
OFF
heating)‐‐No humidistat required. ON
ON
Not an applicable selection.
Not Used
Notes:
1. To enter dehumidification mode, ODD input should be 0 VAC; for normal cooling CFM, ODD input should be 24 VAC.
YT Unit Physical Data
2. Heating CFM is not affected by dehumidification mode. When in dehumidification mode, cooling CFM is 85% of normal CFM.
Unit Physical Data
Dual Capacity Vertical
Model Number
Fan Wheel (in.)
Fan Motor ECM (HP)
Refrigerant Charge (oz.)
Air Coil
Face Area (Sq. Ft.)
Dimensions (in.)
Number of Rows
Unit Weight lbs (shipping)
024
10 x 8
3/4
56
3.51
25.5 x 19.8 x 1
300
036
11 x 10
3/4
80
048
11 x 10
3/4
87
4.76
4.76
28.9 x 23.7 x 1.26
N/A - Micro-Channel Coil
415
450
060
11 x 10
1
94
072
11 x 10
1
94
5.65
5.65
32.8 x 24.8 x 1.26
475
480
Notes:
Source water loop - residential models use 1” double o-ring fittings, commercial models use 1” FPT fittings.
All measurements are in inches.
All Desuperheater connections are 3/4” FPT.
Electrical connections are 1” for high voltage, 1/2” for low voltage
* Width excludes field installed factory supplied flanges.
G:\Drafting\Drawings\Released-Production\IPT-IDW-IAM\20D800-10NN REVA UNIT PHYSICAL DATA.xlsx
Enertech Global
12
IOM, YT Models
FILTER PERFORMANCE:
The blower performance data in the ECM
Blower Performance table is WITHOUT FILTER.
To determine the approximate blower
performance WITH FILTER apply the filter
pressure drop value for the filter being used or
calculate the pressure drop as follows:
6. Total ESP should be less than or equal to
Max ESP
Example: For an YT060 at an air flow of 1960
CFM calculate the filter pressure drop with a
2” MERV 11 filter and determine Total ESP and
compare to Max ESP.
Below is typical filter performance data
and should only be used as a guideline.
Actual performance may vary between
manufacturers.
Return Size
Model
024
036
048
060
072
Area
2
(ft )
3.8
5.1
5.8
Height
(in.)
Width
(in.)
Area
26
21
3.8
28
26
5.1
32
26
5.8
2
(ft )
CFM = 1960
Area = 5.8 ft2
Rated Velocity = 500 fpm
Initial Resistance = 0.24 in.w.c.
Measured ESP without filter = 0.53
Rated
Initial
Filter Thickness
Velocity
Resistance
1.(in)
1960 CFM ÷ 5.8 ft2 = 338 fpm
Type
(in.w.c.)
2. 338 fpm(fpm)
÷ 500 fpm
= 0.676
= 0.16 in.w.c. = Filter
MERV 8 3. 10.676 x 0.24
300 in.w.c.0.21
Pressure
Drop
MERV 11
2
500
0.24
is 0.53 + 0.16
MERV 13 4. 2Total ESP500
0.43 = 0.69 in.w.c. which is
less than the 1.2 in.w.c. Max ESP
Rated
Initial
Thickness
Velocity Resistance
(in)
(fpm)
(in.w.c.)
MERV 8
1
300
0.21
MERV 11
2
500
0.24
MERV 13
2
500
0.43
Filter
Type
To calculate filter pressure drop:
Applying Filter Pressure Drop to Determine Total
ESP
To determine the Total ESP of a unit with the
filter in place, follow the steps below:
1. Select the filter type and determine Rated
Velocity and Initial Resistance
2. For the model being considered determine
Max ESP, CFM and Return Area
3. Determine Filter pressure drop (ΔPs) using
the equation above
4. Measure (or calculate) the ESP without filter
in place
5. Calculate Total ESP = Measured ESP + Filter
Pressure Drop
IOM, YT Models
Example: For an YT036 at an air flow of 1420
CFM calculate the filter pressure drop with a
2” MERV 13 filter and determine Total ESP and
compare to Max ESP.
CFM = 1420
Area = 5.1 ft2
Rated Velocity = 500 fpm
Initial Resistance = 0.43 in.w.c.
Measured ESP without filter = 0.53
1. 1420 CFM ÷ 5.1 ft2 = 278 fpm
2. 278 fpm ÷ 500 fpm = 0.556
3. 0.556 x 0.43 in.w.c. = 0.24 in.w.c. = Filter
Pressure Drop
4. Total ESP is 0.36 + 0.24 = 0.6 in.w.c. which is
less than the 1.1 in.w.c. Max ESP
13
Enertech Global
SECTION 4: UNIT DATA INFORMATION
20D237‐08NN: YT Electrical Data
Unit
Electrical Data
Model
YT024
YT036
YT048
YT060
YT072
60 Hz Power
Compressor
Voltage
Code/ HWG
Option
Volts
Phase
LRA
00
01
10
11
20
21
30/35
00
01
10
11
20
21
30/35
00
01
10
11
20
21
30/35
00
01
10
11
20
21
30/35
00
01
10
11
20
21
30/35
208/230
208/230
208/230
208/230
208/230
208/230
460
208/230
208/230
208/230
208/230
208/230
208/230
460
208/230
208/230
208/230
208/230
208/230
208/230
460
208/230
208/230
208/230
208/230
208/230
208/230
460
208/230
208/230
208/230
208/230
208/230
208/230
460
1
1
1
1
3
3
3
1
1
1
1
3
3
3
1
1
1
1
3
3
3
1
1
1
1
3
3
3
1
1
1
1
3
3
3
58.3
58.3
58.3
58.3
55.4
55.4
28.0
83.0
83.0
83.0
83.0
73.0
73.0
38.0
104.0
104.0
104.0
104.0
83.1
83.1
41.0
152.9
152.9
152.9
152.9
110.0
110.0
52.0
179.2
179.2
179.2
179.2
136.0
136.0
66.1
RLA
Fan
Motor
FLA
HWG
Pump
FLA
11.7
11.7
11.7
11.7
6.5
6.5
3.5
15.3
15.3
15.3
15.3
11.6
11.6
5.7
21.2
21.2
21.2
21.2
14.0
14.0
6.4
27.1
27.1
27.1
27.1
16.5
16.5
7.2
29.7
29.7
29.7
29.7
17.6
17.6
8.5
5.2
5.2
5.2
5.2
5.2
5.2
4.7
5.2
5.2
5.2
5.2
5.2
5.2
4.7
5.2
5.2
5.2
5.2
5.2
5.2
4.7
6.9
6.9
6.9
6.9
6.9
6.9
6.0
6.9
6.9
6.9
6.9
6.9
6.9
6.0
0.0
0.5
0.0
0.5
0.0
0.5
0.0
0.0
0.5
0.0
0.5
0.0
0.5
0.0
0.0
0.5
0.0
0.5
0.0
0.5
0.0
0.0
0.5
0.0
0.5
0.0
0.5
0.0
0.0
0.5
0.0
0.5
0.0
0.5
0.0
Ext.
Loop
Pump
FLA
0.0
0.0
4.0
4.0
0.0
0.0
0.0
0.0
0.0
4.0
4.0
0.0
0.0
0.0
0.0
0.0
5.5
5.5
0.0
0.0
0.0
0.0
0.0
5.5
5.5
0.0
0.0
0.0
0.0
0.0
5.5
5.5
0.0
0.0
0.0
Min
Total
Circuit
Unit FLA
AMPS
16.9
17.4
20.9
21.4
11.7
12.2
8.2
20.5
21.0
24.5
25.0
16.8
17.3
10.4
26.4
26.9
31.9
32.4
19.2
19.7
11.1
34.0
34.5
39.5
40.0
23.4
23.9
13.2
36.6
37.1
42.1
42.6
24.5
25.0
14.5
19.8
20.3
23.8
24.3
13.3
13.8
9.4
24.3
24.8
28.3
28.8
19.7
20.2
11.8
31.7
32.2
37.2
37.7
22.7
23.2
12.7
40.8
41.3
46.3
46.8
27.5
28.0
15.0
44.0
44.5
49.5
50.0
28.9
29.4
16.6
Max
Fuse
HACR
30
30
35
35
20
20
10
40
40
40
40
30
30
15
50
50
50
50
35
35
15
60
60
70
70
40
45
20
70
70
70
80
45
45
25
Notes:
1. All line and low voltage wiring must adhere to the National Electrical Code and local codes, whichever is the most
stringent.
2. In determining the correct supply wire size and maximum length, reference NFPA 70, Section 310. If the calculation is
close to the maximum allowable ampacity of a particular wire size, use the next size up. This will ensure that no adverse
effects occur, such as light dimming and/or shortened compressor life.
3. All fuses class RK-5.
4. Min/Max Voltage: 208/230/60 = 187-252, 460/60 = 432-502
5. See Wiring Diagrams for proper 460V power.
*The external loop pump FLA is based on a maximum of three UP26-116F-230V pumps (1/2hp) for 048-072 and two pumps
for 024-036.
Enertech Global
14
IOM, YT Models
SECTION 5: GENERAL UNIT ASSEMBLY
Pre-Installation Checklist
BEFORE YOU FULLY INSTALL THE GEOTHERMAL
EQUIPMENT, IT IS RECOMMENDED YOU GO
THROUGH THIS QUICK CHECKLIST BEFORE PLACING THE EQUIPMENT.
⧠
⧠
Fully inspect the unit after unpacking.
⧠
Maintain the installation instructions
included with any kits for installation during
unit assembly.
⧠
Remove and discard any blower housing
supports and the motor armature shaft
shipping bracket from the rear of the
blower.
⧠
Remove and discard the blower housing
bottom M shaped shipping bracket
⧠
Locate and review the Equipment Start-Up
Procedures and Forms from this manual
and have it available as the unit installation
proceeds.
⧠
Clean the air coil with soap and water
solution to remove any oil or dirt.
Open both the air handler section and
compressor section and remove any
packaging material or documentation
included in the unit.
Field Selectable Return Air Pattern
under the air coil itself. These connections are
easier to facilitate if done prior to the fitting
of the return air drop. The condensate drain
is field selectable and will be discussed in the
“CONDENSATE DRAIN TUBE INSTALLATION”
section later in this document.
If the unit needs to be changed to a right hand
return configuration, please complete the
following:
1. Using a flat blade, remove the front center
insert panel. Place the flat blade in the gap
on one side and gently pull out. (Refer to
the picture in step 2 of the following Control
Box Installation section).
2. Remove the lower then the upper front
doors. (Use caution to support the doors as
the screws are removed to avoid dropping
the panels).
3. Once the doors are removed, the plate
behind the center insert panel (same color
as the unit) will be exposed. This will need
to be removed, so it can be placed on the
back side of the unit for panel attachment
in the right hand return configuration.
4. Remove the rear bottom and top doors.
5. At this point the front and rear doors should
be completely removed from the unit.
6. Take the panel that was removed from
behind the front center insert panel, and
re-install it in the same location in the back
side of the unit. There should be a total of
(5) screws.
7. Remove all shipping brackets. Proceed to
the “CONTROL BOX INSTALLATION” section,
unless the unit has a factory installed soft
start module. If the unit has a factory
installed soft start module, it will need to be
moved from the front right corner to the
back right corner of the unit, so proceed to
the “SOFT START CONVERSION - RIGHT HAND
RETURN- ” section.
This unit is a field selectable return air unit. The
unit will come already set up for a left hand
return. The source and hot water generator
connections are on the air coil side of the unit,
IOM, YT Models
15
Enertech Global
SECTION 5: GENERAL UNIT ASSEMBLY
Control Box Installation
1. This unit should look similar to what is shown
below after removing all cardboard and
plastic wrap on unit and in front of the air coil.
2. Remove the center insert panel on the front
of the unit by inserting a flat blade in the gap
on one side and gently prying open as shown in
the picture below.
4. Viewing the right side of the unit, remove
the control box shipping bracket from the unit
and from the control box. This will require the
removal of 4 screws.
3. Remove the outer doors from the unit. Units
are shipped with the control box in the unit air
handler section.
5. Remove bracket from the
control box and discard.
Enertech Global
16
IOM, YT Models
SECTION 5: GENERAL UNIT ASSEMBLY
6. Mounting the control box requires removal
of the selected (left or right return) top cover
access filler plate. Make sure to keep the (4)
screws for future use.
8. Pass the control box asm. up through the
opening in the top cover.
7. Remove the blower motor/blower wheel
bracket and the blower housing bracket at this
time. Remove both brackets with (2) screws
from each bracket. Once removed discard.
IOM, YT Models
17
Enertech Global
SECTION 5: GENERAL UNIT ASSEMBLY
9. The front edge of the control box asm. should
hang over the front edge of the top cover as
shown below.
11. Slide the small filler plate into the slot at the
bottom rear of the control box asm. This plate
will cover and insulate the remainder of the
access opening of the control box asm.
12. Assemble the small filler plate using the (4)
screws provided.
10. Locate and then open the small filler plate
kit found in the bottom of the unit.
13. Remove the control front from the control
box asm. by removing two screws (1 on each
side). Be sure to keep these two screws as they
will be used when the control front is assembled
back onto the control box asm.
Enertech Global
18
IOM, YT Models
SECTION 5: GENERAL UNIT ASSEMBLY
15. Confirm that the position of the unit wiring in
the air handler section is well placed and does
not come into contact with the blower wheel/
motor or any sharp edges. Leave the wiring
bundle as two separate bundles as shown
below. If the wiring needs additional bundling,
use the extra plastic tie straps provided.
14. Assemble the control box asm to the top
of the unit by aligning the screw holes in the
control box asm to the top cover, insert and
start screws. Align, insert, and tighten these (3)
screws.
16. If this is a left hand return unit move to
Step 19. If this is a right hand return unit,
relocate the control box asm to the other side
of the unit as shown in the next few steps. Then
assemble the control box asm. to the top of the
unit using the previous steps shown above. Start
by removing the front plate behind the center
insert panel.
IOM, YT Models
19
Enertech Global
SECTION 5: GENERAL UNIT ASSEMBLY
17. Move the control box asm. into place by
sliding it under the blower housing to what will
become the front of the unit when configured
as a right hand return unit.
18. Once the control box asm. has been
relocated under the blower housing to what
is now the front of the unit as a right hand
return, assemble it through the opening in the
top cover and onto the top of the unit per the
previous steps 8 through 14.
19. Be sure to reassemble the front plate
(behind the center insert panel) to the new
front of the unit if this is a right hand return unit.
If it is a left hand return unit, this front plate was
not previously removed.
While panels are still removed continue unit
assembly by proceeding to the instructions for
Condensate Drain Tube Installation or Soft Start
Conversion, Right Hand Return sections on the
immediately following pages.
If no further assembly is required reassemble all
panels, the control box cover, and doors that
were removed from the unit before unit startup.
The door with the logo will be the top front
door and the bottom door without a handle
will be the bottom front door. You have how
completed the control box installation.
Enertech Global
20
IOM, YT Models
SECTION 5: GENERAL UNIT ASSEMBLY
CONDENSATE DRAIN TUBE INSTALLATION
The flexible tube condensate drain allows field
selectable installation. Installation requires
removal of access panels/doors.
TO INSTALL THE DRAIN TUBE ASSEMBLY:
1. Looking at the front and rear coil side of
the unit you will notice the “Condensate
Drain” labels and plastic black plugs.
Decide which direction that you want your
unit to drain, front or rear, and remove the
corresponding black plug.
2. Remove the lower access panel on the
side of the condensate exit. If this panel is
on the “front” of the unit that incorporates
the bellyband, the bellyband will need to
be removed before the lower access panel
can be removed.
Note: Do not pry on the “bellyband” panel
that runs across the front of the unit covering
the front top and lower access panel screws.
3. Insert a non-marring blade (1/4” to 1/2”
wide) into the small indent on the right
or left side of the band and apply slight
outward pressure to release the latch tab.
Use caution to not overbend the metal or
latch during removal. Should the latch tab
become overbent go ahead and return it
to its original position.
The length of the vinyl tubing is already
precut to the proper length.
9. To check the routing of the drain, fit the vinyl
tube asm from the inside of the corner post
hole to the drain, noting any obstacles that
you need to route around.
10.While working on the inside of the unit,
fit the gasket and barb/vinyl tube asm
up to the inside if the corner post. At this
point assemble the 3/4” S x 3/4” Mips Male
Adapter through the hole in the corner,
through the gasket, and thread into the
female barb fitting. Hand tighten only. If
using a 1” P-trap you must supply and install
a 1” S x 3/4” Mips adapter.
11.At this point go ahead and route the vinyl
tubing up to the drain pan tube, making
sure to not leave any internal traps along
the way.
12.If needed wet the inside of the vinyl tube so
it will assemble easier to the drain pan drain.
13.Push the end of the vinyl tube over the drain
pan tube.
14.Take a second look to make sure everything
is in place and that there are no internal
condensate traps. If all is ok, assemble the
plastic squeeze clamp over the vinyl tube/
drain pan tube.
4. Remove the access panel on the coil side
that covers the coax area. Once this coax
panel is removed look inside, near the top
right hand corner where the panel was
assembled. There you will find the bottom
drain tube exiting the drain pan.
15.The condensate drain tube installation has
been completed. We are now ready to
work on the drain outside of the unit.
5. On the drain pan tube you will find a plastic
plug, remove the plug from the tube.
17.Once completed, reassemble all access
panels to the unit.
Note: this plug must be totally removed from
the unit, otherwise the condensate will not
drain from the unit.
6. Working on the end of the unit that you
want the condensate to exit (the plastic
fitting end), complete the following:
7. Locate the Drain Kit packaged in a plastic
bag in the bottom of your unit.
8. Open the bag and attach the clear vinyl
tube to the barb adapter, apply plastic
squeeze clamp over the tubing/barb
adapter, tightening the clamp with pliers.
IOM, YT Models
16.Connect the exterior condensate drain
piping to the male adapter as described in
the Unit Piping Installation section.
Return Duct Flange Kit Installation
Install the flanges per the instructions, part #
20D200-01NN, provided in the kit package
shipped inside the unit.
Optional Filter Rack Kit Installation
Installation of the optional and sold separately
accessory filter rack is described in the
installation instructions provided with that item.
Maintenance and filter change instructions are
included in the owners manual shipped with
every unit.
21
Enertech Global
SECTION 5: GENERAL UNIT ASSEMBLY
SOFT START CONVERSION, RIGHT HAND RETURN
Remove the right side door of the unit (non-coil
side).
1. With the front, rear, and right side doors
removed, remove the (2) screws holding
the soft start bracket and module to
the lower right front corner of the unit.
5. Use the (2) screws that were removed in
the front, to attach the bracket to the rear,
lower right corner. Holes already exist for this
installation.
2. Take the bracket, with the soft start
module and wiring, and route it out
the right side of the unit, around the
compressor, and then back into the
rear side of the unit. See picture below.
6. Clip the module back into the plastic clip
that is mounted on the metal bracket,
making sure that the wiring is pointed
downward. See picture below.
7. Refer to the end of the Controls Section
for details on the ‘Mode of Operation’
specifications and the ‘LED Status
Indication’ chart.
3. At this point, the bracket, with the soft start
module and wiring, should be sitting loose in
the rear, bottom side of the unit.
4. Take a flat blade screwdriver, and pop the
module (with the wiring connected) out of
the plastic clip that is mounted to the sheet
metal bracketshown in the picture below.
Enertech Global
22
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
Water Quality
The quality of the water used in geothermal
systems is very important. In closed loop systems
the dilution water (water mixed with antifreeze)
must be of high quality to ensure adequate
corrosion protection. Water of poor quality
contains ions that make the fluid “hard” and
corrosive. Calcium and magnesium hardness
ions build up as scale on the walls of the system
and reduce heat transfer. These ions may also
react with the corrosion inhibitors in glycol based
heat transfer fluids, causing them to precipitate
out of solution and rendering the inhibitors
ineffective in protecting against corrosion. In
addition, high concentrations of corrosive ions,
such as chloride and sulfate, will eat through any
protective layer that the corrosion inhibitors form
on the walls of the system.
Ideally, de-ionized water should be used for
dilution with antifreeze solutions since deionizing removes both corrosive and hardness
ions. Distilled water and zeolite softened water
are also acceptable. Softened water, although
free of hardness ions, may actually have
increased concentrations of corrosive ions and,
therefore, its quality must be monitored. It is
recommended that dilution water contain less
than 100 PPM calcium carbonate or less than
25 PPM calcium plus magnesium ions; and less
than 25 PPM chloride or sulfate ions.
In an open loop system the water quality is
of no less importance. Due to the inherent
variation of the supply water, it should be tested
prior to making the decision to use an open
loop system. Scaling of the heat exchanger
and corrosion of the internal parts are two of
the potential problems. The Department of
Natural Resources or your local municipality
can direct you to the proper testing agency.
Please see Table 2 for guidelines.
Failure to adhere to the water quality guidelines
may result in loss of warranty
Table 2: Water Quality
Potential
Scaling
Corrosion
Problem Chemical(s) or
Condition
Calcium & Magnesium
Range for Copper
Heat Exchangers
Less than 350 ppm
Range for Cupro-Nickel
Heat Exchangers
Less than 350 ppm
pH Range
7-9
5-9
7-9
Total Dissolved Solids
Less than 1000 ppm
Less than 1500 ppm
No rigid setpoint
Ammonia, Ammonium Hydroxide
Less than 0.5 ppm
Less than 0.5 ppm
No Limit
Ammonium Chloride, Ammonium
Less than 0.5 ppm
Less than 0.5 ppm
Less than 2-20 ppm
Calcium Chloride / Sodium
Less than 125 ppm
Less than 125 ppm
Not Allowed
Chlorine
Less than 0.5 ppm
Less than 0.5 ppm
Not Allowed
Hydrogen Sulfide
None Allowed
None Allowed
Less than 0.05 ppm
Iron Bacteria
None Allowed
None Allowed
Not Allowed
Iron Oxide
Less than 1 ppm
Less than 1 ppm
Less than 0.2 ppm
Suspended Solids
Less than 10 ppm
Less than 10 ppm
16-20 mesh strainer recommended
Biological
Erosion
Range for Stainless Steel BPHE
Less than 0.1 ppm
Water Velocity
Less than 12 ft/s
Less than 5.5 m/s in the port
Less than 8*/s
1. Hardness in ppm is equivalent to hardness in mg/l.Notes
2. Grains/gallon = ppm divided by 17.1.
3. Unit internal heat exchangers are not recommended for pool applications or water outside the range of the table. Secondary heat
exchangers are required for pool or other applications not meeting the requirements shown above.
4. Saltwater applications (approx. 25,000 ppm) require secondary heat exchangers due to copper piping between the heat exchanger.
5. Filter for maximum of 600 micron size.
IOM, YT Models
23
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Interior Piping
All interior piping must be sized for proper flow
rates and pressure loss. Insulation should be
used on all inside piping when minimum loop
temperatures are expected to be less than
50°F. Use the table below for insulation sizes with
different pipe sizes. All pipe insulation should
be a closed cell and have a minimum wall
thickness of 3/8”. All piping insulation should
be glued and sealed to prevent condensation
and dripping. Interior piping may consist of the
following materials: HDPE, copper, brass, or
rubber hose (hose kit only). PVC is not allowed
on pressurized systems.
Note: Connect the drain through the trap to
the condensation drain system in conformance
to local plumbing codes.
Part Number Description
ACDT1A - EZ-Trap ¾” Kit
ACDT2A - EZ-Trap 1” Kit (customer must provide
a 1” S x 3/4” Mips adapter)
Typical Pressurized Flow Center Installation
The flow centers are insulated and contain
all flushing and circulation connections for
residential and light commercial earth loops
that require a flow rate of no more than 20
gpm. 1-1/4” fusion x 1” double o-ring fittings
(AGA6PES) are furnished with the double o-ring
flow centers for HDPE loop connections. Various
fittings are available for the double o-ring flow
centers for different connections. See figure 6
for connection options. A typical installation will
require the use of a hose kit. Matching hose kits
come with double o-ring adapters to transition
to 1” hose connection.
Table 3: Pipe Insulation
Piping Material
Insulation Description
1” IPS PE
1-1/4” ID - 3/8” Wall
1” IPS Hose
1-3/8” ID - 3/8” Wall
1-1/4” IPS PE
1-5/8” ID - 3/8” Wall
2” IPS PD
2-1/8” ID - 3/8” Wall
Condensation Drain Connection
Connect the EZ-Trap to the 3/4” equipment
condensate drain connection as shown in
figure 9a. The condensate line must be trapped
a minimum of 1.0” as shown in the diagram.
The condensate line should be pitched away
from the unit a minimum of 1/4” per foot. The
condensate line from the unit drain connection
to the P-trap should be sloped downward.
For more information on installing EZ-Trap, see
installation sheet that comes with the EZ-Trap
Kit. Always install the air vent after the trap.
Figure 9a: Typical Condensation Drain
Connection
Cleaning Holes (Capped)
Vent
Unit Condensate
Drain Outlet
1.0”
1/4" per foot
Front of Unit
Enertech Global
Note: Threaded flow centers all have 1” FPT
connections. Matching hose kits come with the
AGBA55 adapter needed to transition from 1”
FPT to 1” hose.
Flushing & Charging a Pressurized Flow Center
Once piping is completed between the unit,
flow center, and the earth loop, final purging
and charging of the system is needed. A flush
cart (at least a minimum of 1.5 hp pump motor
or larger) is needed to achieve adequate flow
velocity (2 fps in all piping) in the loop to purge
air and debris from the loop piping (unless the
header manifold is located inside and has
isolation valves). All air and debris must be
removed from the system before operation
or pump failure could result. The flush ports
located on the flow center are access to the
piping system for the flush cart. See figure 7 for
connection details.
The 3-way valves on the flow center include
direction indicators on the valves which
determine the flow path (see figure 8). A 3/8”
socket drive is required to operate the 3-way
valves. The valves will turn in either direction,
360 degrees. Make sure during this process that
the valves are in the same position so that air
does not become trapped in the system.
24
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
Figure 6: Typical Single Unit Piping Connection (Pressurized Flow Center)
LEFT
VIEW
Loop Field
~~
Flow
Center
air
coil
Hose
Kit
P/T Ports
Source Out
P/T Ports
Source In
Equipment Pad
2” Polyethylene Foam
Figure 7: Typical Single Unit Piping Connection (Non-Pressurized Flow Center)
LEFT
VIEW
To
Loop
Field
air
coil
From
Loop
Field
Flush
Valve
Hose
Kit
P/T Ports
P/T Ports
Source Out
Source In
Non-Pressurized
Flow Center
Equipment Pad
2” Polyethylene Foam
IOM, YT Models
25
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Pressurized Flow Center and Pump Mounting
flow center can mounted with the flow paths either
or
upside
or at an
flow center cannot mounted on its
when the pump
is not in the
and
(see
as premature pump
series flow centers
important to pump
is terminal
and
pump terminal
must located in a
to
and also to
the
designed to drain any
control
are located on three sides the pump.
terminal
Enertech Global
the
will occur
and
26
proper control
running into the
that may
pumps.
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
Figure 10: Flush Cart Pump Curve
110
100
REMOVING DEBRIS DURING FLUSHING
Most flow center or pump failures are a
result of poor water quality or debris. Debris
entering the loop during fusion and installation can cause noise and premature pump
failure. Enertech recommends a double
flush filtering method during purging. When
purging, use a 100 micron bag filter until
air bubbles are removed. Remove the 100
micron bag, replace it with a 1 micron bag
and restart the flushing.
FEATURES OF THE FLUSH CART:
Cylinder: HDPE, SDR15.5, 10” dia. (10 Gallons)
Pump: Myers High Head QP15, 1.5hp, 115V
Hose connections: Cam Lock quick connects 1-1/2” hoses
Hand Truck: 600lb rating with pneumatic tires
Wiring: Liquid Tight metal on/off switch
Tubing: SDR11 HDPE
Connections: 2 - 3/4” connections for antifreeze
and discharge
Drain: one on the pump and the tank
Figure 9: Enertech Flush Cart
IOM, YT Models
Meyers QP-15
1-1/2 HP Self-Priming
Centrifugal Pump
120
Total Head in Feet
FLUSH CART DESIGN:
The Enertech Manufacturing flush cart has been
designed to effectively and efficiently flush the
earth loop and to facilitate injecting and mixing
of the antifreeze. The single most important
element in flow center reliability is the ability to
remove all the air and debris from the loop and
to provide the proper working pressure.
90
25’
80
70
20’
60
15’
50
40
30
20
10
0
SUCTION LIFT
10
20
30
40
50
60
CAPACITY - U.S. GPM
70
80
90
STEP 1: FLUSHING THE EARTH LOOP
• Connect flush cart hoses to flow center flush
ports using proper adapters #AGAFP.
• Connect water supply to hose connection
on return line of flush cart.
• Turn both 3-way valves on flow center to
flush ports and loop position.
• Turn on water supply (make sure water is of
proper quality).
• As the reservoir fills up, turn the pump on
and off, sucking the water level down. Do
not allow the water level to drop below
intake fitting to the pump.
• Once the water level remains above the
water outlet in the reservoir leave the pump
running continuously.
• Once the water level stays above the “T” in
the reservoir, turn off the water supply (this
also allows observation of air bubbles).
• 8. Run the pump for a minimum of 2 hours for
proper flushing and purging (depending on
system size it may take longer).
• “Dead head” the pump every so often and
watch the water level in the reservoir. Once
all the air is removed there should not be
more than a 1” to 2” drop in water level
in the reservoir. If there is more than a 2”
drop, air is still trapped in the system. This is
the only way to tell if air is still trapped in the
system.
• To dead head the pump, shut off the return
side ball valve on the flush cart. This will
provide a surge in pressure to the system
piping, helping to get the air bubbles
moving. Do not reverse flow during flushing.
27
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Figure 7: Flush Cart Connections
Figure 8: Flow Center 3-Way Valves
Loop
Loop
Flush Port
Unit
Flush Port
Unit
Unit
Water Quality: Even on a closed loop system
water quality is an issue. The system needs to be
filled with clean water. If the water on site has
high iron content, high hardness, or the PH is out
of balance, premature pump failure may result.
Depending upon water quality, it may need to
be brought in from off site.
STEP 2: FLUSHING THE UNIT
1. Turn off the pump on the flush cart.
2. Turn both 3-way valves to the unit and flush
port position.
3. Turn the pump back on. It may be
necessary to turn the water supply back
on to keep the water level in the reservoir
above the return tee.
4. This should only take 5 to 10 minutes to
purge the unit.
5. Once this is done, the entire system is now
full of water, and the flush cart pump may
be turned off.
STEP 3: ADDING ANTIFREEZE BY DISPLACEMENT
If the antifreeze was not added when the loop
was being filled, it will be necessary to follow
the next few steps.
1. Turn both 3-way “Ts” back to the original
position for flushing the loop only.
2. Close the return side ball valve on the flush
cart.
3. Connect hose to the return side discharge
line and run it to a drain. Open the ball
Enertech Global
Loop
Flush Port
Flush Port
Loop
Unit
valve on discharge line on flush cart.
4. Turn pump on until water level is sucked
down just above the water outlet in the
reservoir, and turn pump off. Be sure not to
suck air back into the system.
5. Fill the reservoir back up with the antifreeze.
6. Repeat steps 5 and 6 until all the antifreeze
is in the system and reservoir.
7. Turn the discharge line ball valve off at the
flush cart. Turn the return line ball valve
back to the on position.
8. It may be necessary to add some water into
the reservoir to keep the water level above
the return tee so that the solution does not
foam.
9. The system must be run for 3 to 4 hours to
mix the antifreeze and water in the reservoir.
The fluid will not mix inside the loop.
10.Check the antifreeze level every so often to
insure that the proper amount was added
to the system (see antifreeze charging
section).
STEP 4: FINAL PRESSURIZATION OF SYSTEM
Once all of the air and debris has been
removed, and the antifreeze has been
added and mixed, the system is ready for final
pressurization.
1. Turn one of the 3-way valves so that it is
open to all 3 ports, the unit, loop, and flush
port. Turn the other valve so it is only open
28
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
to the loop and flush port (pressure is also
applied to the hose kit in this arrangement).
2. Turn the flush cart pump on and allow the
system to start circulating.
3. With the pump running, turn the return line
ball valve to the off position on the flush
cart, “dead heading” the pump.
4. There should be a maximum of 1” to 2”
inches of drop in the water level in the
reservoir. This only takes about 3-5 seconds.
5. Next, turn the supply line ball valve to the off
position on the flush cart (isolates the flow
center from the flush cart).
6. Now that the system is isolated from the
reservoir the pump can be turned off. Do
not open the main flush cart ball valves yet.
7. Connect the water supply back to the
discharge line hose connection, and open
the ball valve. Turn on the water supply
and leave it on for 20 to 30 minutes. This
will stretch the pipe properly to insure that
the system will not have a “flat” loop during
cooling operation.
8. Once the loop is pressured (recommended
pressure on initial start up is 50 to 70 psi), turn
the water supply off. Turn off the discharge
line ball valve, and disconnect the water
supply. Maximum pressure should never
exceed 100 psi under any circumstance!
9. Turn the 3-way valves on the flow center
back to the normal operation mode, which
closes the flush port connections.
10. Open the ball valves on the flush cart to
relieve pressure on the hoses. Disconnect the
hoses from the flow center.
Note: Pressurized flow centers and Grundfos UP
series pumps need a minimum of 3psi on the
suction side of the pump to operate. Maximum
operating pressure is 100 psi.
Loop static pressure will fluctuate with the
seasons. Pressures will be higher in the winter
months than during the summer months. In
the cooling mode the heat pump is rejecting
heat, which relaxes the pipe. This fluctuation
is normal and needs to be considered when
charging and pressuring the system initially.
Typical operating pressures of an earth loop are
15 to 50 psi.
IOM, YT Models
Note - Burping pump(s): On flow center initial
start up, the pumps must be bled of air. Start
the system and remove the bleed screw from
the back side of the pump(s). This allows any
trapped air to bleed out. It also floods the
pump shaft, and keeps the pump(s) cool.
Failure to do this could result in premature
pump failure.
Typical Non-Pressurized Flow Center Installation
Standing column flow centers are designed to
operate with no static pressure on the earth
loop. The design is such that the column of
water in the flow center is enough pressure to
prime the pumps for proper system operation
and pump reliability. The flow center does have
a cap/seal, so it is still a closed system, where the
fluid will not evaporate. If the earth loop header
is external, the loop system will still need to be
flushed with a purge cart. The non-pressurized
flow center needs to be isolated from the flush
cart during flushing because the flow center
is not designed to handle pressure. Since this
is a non-pressurized system, the interior piping
can incorporate all the above-mentioned pipe
material options (see interior piping), including
PVC. The flow center can be mounted to the
wall with the included bracket or mounted on
the floor as long as it is properly supported.
Flushing the Interior Piping (Non-Pressurized)
Do not use the flush cart to purge the interior
piping and flow center in a non-pressurized
system. Once the loop has been flushed the
ball valves may be opened above the flush
ports. Take a garden hose from the flush port
connected to the water out to the loop pipe,
and run the other end of the hose into the top
of the canister. Fill the canister with water and
turn the pumps on. Continue to fill the canister
until the water level stays above the dip tube.
Once filling is complete, remove the hose and
close the flush port. Turn the system on. Any air
that may still be in the system will burp itself out
of the top of the canister. Leave the top open
for the first 1/2 hour of run time to ensure that
all of the air is bled out. Tighten the cap on the
flow center to complete the flushing and filling
procedure (hand tighten only -- do not use a
wrench).
29
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Antifreeze Overview
In areas where minimum entering loop
temperatures drop below 40°F, or where piping
will be routed through areas subject to freezing,
antifreeze is required. Alcohols and glycols
are commonly used as antifreeze. However,
local and state/provincial codes supersede
any instructions in this document. The system
needs antifreeze to protect the coaxial heat
exchanger from freezing and rupturing.
Freeze protection should be maintained to
15°F below the lowest expected entering
source loop temperature. For example, if 30°F
is the minimum expected entering source
loop temperature, the leaving source loop
temperature could be 22 to 25°F. Freeze
protection should be set at 15°F (30-15 =
15°F). To determine antifreeze requirements,
calculate how much volume the system holds.
Then, calculate how much antifreeze will
be needed by determining the percentage
of antifreeze required for proper freeze
protection. See Tables 4 and 5 for volumes and
percentages. The freeze protection should be
checked during installation using the proper
hydrometer to measure the specific gravity and
freeze protection level of the solution.
Antifreeze Characteristics
Selection of the antifreeze solution for closed
loop systems require the consideration of
many important factors, which have long-term
implications on the performance and life of
the equipment. Each area of concern leads to
a different “best choice” of antifreeze. There
is no “perfect” antifreeze. Some of the factors
to consider are as follows (Brine = antifreeze
solution including water):
Safety: The toxicity and flammability of the brine
(especially in a pure form).
Cost: Prices vary widely.
Thermal Performance: The heat transfer and
viscosity effect of the brine.
Corrosiveness: The brine must be compatible
with the system materials.
Stability: Will the brine require periodic change
out or maintenance?
Enertech Global
Convenience: Is the antifreeze available and
easy to transport and install?
Codes: Will the brine meet local and state/
provincial codes?
The following are some general observations
about the types of brines presently being used:
Methanol: Wood grain alcohol that is
considered toxic in pure form. It has good heat
transfer, low viscosity, is non-corrosive, and is mid
to low price. The biggest down side is that it is
flammable in concentrations greater than 25%.
Ethanol: Grain alcohol, which by the ATF
(Alcohol, Tobacco, Firearms) department
of the U.S. government, is required to be
denatured and rendered unfit to drink. It has
good heat transfer, mid to high price, is noncorrosive, non-toxic even in its pure form, and
has medium viscosity. It also is flammable with
concentrations greater than 25%. Note that
the brand of ethanol is very important. Make
sure it has been formulated for the geothermal
industry. Some of the denaturants are not
compatible with HDPE pipe (for example,
solutions denatured with gasoline).
Propylene Glycol: Non-toxic, non-corrosive,
mid to high price, poor heat transfer, high
viscosity when cold, and can introduce micro
air bubbles when adding to the system. It
has also been known to form a “slime-type”
coating inside the pipe. Food grade glycol is
recommended because some of the other
types have certain inhibitors that react poorly
with geothermal systems. A 25% brine solution is
a minimum required by glycol manufacturers,
so that bacteria does not start to form.
Ethylene Glycol: Considered toxic and is not
recommended for use in earth loop applications.
POTASSIUM ACETATE (GS4): Considered highly
corrosive (especially if air is present in the
system) and has a very low surface tension,
which causes leaks through most mechanical
fittings. This brine is not recommended for use in
earth loop applications.
30
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
Antifreeze Charging
Calculate the total amount of pipe in the
system and use Table 4 to calculate the
amount of volume for each specific section of
the system. Add the entire volume together,
and multiply that volume by the proper
antifreeze percentage needed (Table 5) for the
freeze protection required in your area. Then,
double check calculations during installation
with the proper hydrometer and specific gravity
chart (Figure 9) to determine if the correct
amount of antifreeze was added.
⚠ CAUTION ⚠
USE EXTREME CARE WHEN OPENING,
POURING, AND MIXING FLAMMABLE
ANTIFREEZE SOLUTIONS. REMOTE FLAMES OR
ELECTRICAL SPARKS CAN IGNITE UNDILUTED
ANTIFREEZES AND VAPORS. USE ONLY IN A
WELL VENTILATED AREA. DO NOT SMOKE
WHEN HANDLING FLAMMABLE SOLUTIONS.
FAILURE TO OBSERVE SAFETY PRECAUTIONS
MAY RESULT IN FIRE, INJURY, OR DEATH.
NEVER WORK WITH 100% ALCOHOL
SOLUTIONS.
Table 4: Pipe Fluid Volume
Type
Size
Copper
1” CTS
Copper
1.25” CTS
HDPE
.75 SDR11
HDPE
1.25” SDR11
HDPE
2” SDR11
Copper
Volume Per 100ft
US Gallons
4.1
6.4
1.5” CTS
HDPE
9.2
3.0
1” SDR11
HDPE
4.7
7.5
1.5: SDR11
9.8
15.4
Additional component volumes:
Unit coaxial heat exchanger = 1 Gallon
Flush Cart = 8-10 Gallons
10’ of 1” Rubber Hose = 0.4 Gallons
Table 5: Antifreeze Percentages by Volume
Antifreeze
Type
Minimum Temperature for
Freeze Protection
10°F
-12.2°C
15°F
-9.4°C
20°F
-6.7°C
25°F
-3.9°C
ProCool
(Ethanol)
25%
22%
17%
12%
Propylene
Glycol
25%
21%
16%
10%
38%
30%
22%
15%
Methanol
Geothermal
Transfer Fluid
(GTF)
Mix according to manufacturer’s
directions on container label
Antifreeze solutions are shown in pure form - not premixed
GTF is a premixed Methanol solution
Notes:
1. Consult with your representative or
distributor if you have any questions
regarding antifreeze selection or use.
2. All antifreeze suppliers and manufacturers
recommend the use of either de-ionized or
distilled water with their products.
IOM, YT Models
31
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Figure 9: Antifreeze Specific Gravity
1.0500
1.0400
1.0300
Specific Gravity
1.0200
1.0100
1.0000
0.9900
0.9800
0.9700
0.9600
-5
0
5
10
15
20
25
30
32
Freeze Protection (deg F)
Procool
Enertech Global
Methanol
32
Propylene Glycol
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
Figure 1: Board
Layout
APSMA Pump Sharing Module
Figure
16: APSMA Module Layout
The pump sharing module, part number
240VAC
240VAC
to Pump(s)
APSMA, is designed to allow two units to share
Power Source
one flow center. With the APSMA module, Figure 1: Board Layout
240V IN 240V OUT
either unit can energize the pump(s). Connect
240VAC
240VAC
to Pump(s)
the units and flow center as shown in Figure
Power Source
16, below. Figure 17 includes a schematic of
240V IN 240V OUT
the board. The module must be mounted in a
NEMA enclosure or inside the unit control box.
Relay
Relay
Local code supersedes any recommendations
in this document.
24VAC
connection
to unit #1
Single Shared Flow Center, Dual Unit Piping
Example
Loop Field
24VAC 24VAC
Relay
(Y1 & C From Thermostat)
24VAC
connection
to unit #1
~ ~
air
coil
P/T Ports
from unit #1
24VAC input
24VAC input
from unit #2
from unit #1
P/T Ports
Source Out
24VAC input
from unit #2
Source Out
P/T Ports
P/T Ports
Shut Off
Valves
Equipment Pad
2” Polyethylene Foam
(Y1 & C From Thermostat)
LED
+
Figure 2: Board
Schematic
Figure
17: APSMA
Module Wiring Schematic
24VAC input
RY1 240VAC input
Hose
Kit
Shut Off
Valves
24VAC
connection
to unit #2
(Y1 & C From
Thermostat)
Figure 2: Board
Schematic
Flow
Center
Source In
(Y1 & C From Thermostat)
24VAC 24VAC
DC
Bridge
air
coil
24VAC
connection
to unit #2
Relay
Source In
-
DC
Bridge
+
+
--
RY1
Diode
RY2
LED
RY2
RY1
Diode
Diode
RY1
240VAC input
to pump(s)
240VAC
RY2
+
-
RY2
Diode
240VAC to pump(s)
Equipment Pad
2” Polyethylene Foam
~~
Single Shared Loop Field, Individual Flow Center
and Unit Piping Example
Direction
of Flow
Loop Field
Shut Off
Valves
air
coil
Flow
Center
Check
Valve
Flow
Center
air
coil
Check
Valve
Direction
of Flow
P/T Ports
P/T Ports
Check
Valve
Direction
of Flow
P/T Ports
P/T Ports
P/T Ports
Source In
Source In
Equipment Pad
2” Polyethylene Foam
Equipment Pad
2” Polyethylene Foam
IOM, YT Models
Flow
Center
Source Out
Source Out
Source In
air
coil
Direction
of Flow
P/T Ports
Source Out
Shut Off
Valves
Shut Off
Valves
33
Enertech Global
SECTION 6: UNIT PIPING INSTALLATION
Open Loop Piping and Connections
Placement of the components for an open
loop system are important when considering
water quality and long term maintenance. The
water solenoid valve should always be placed
on the outlet of the heat pump, which will keep
the heat exchanger under pressure when the
unit is not operating. If the heat exchanger is
under pressure, minerals will stay in suspension.
Water solenoid valves are also designed to
close against the pressure, not with the pressure.
Otherwise, they tend to be noisy when closing.
A flow regulator should be placed after the
water solenoid valve. Always check the product
specification catalog for proper flow rate. A
calculation must be made to determine the
flow rate, so that the leaving water temperature
does not have the possibility of freezing.
Other necessary components include a strainer,
boiler drains for heat exchanger flushing, P/T
ports and ball valves. Ball valves allow the
Figure 5: Open Loop Piping Example
LEFT
VIEW
Two Stage Units
S
air
coil
water to be shut off for service, and also help
when velocity noise is noticeable through the
flow regulator. Spreading some of the pressure
drop across the ball valves will lessen the
velocity noise. Always double check flow rate
at the P/T ports to make sure the ball valve
adjustments have not lowered water flow too
much, and essentially taken the flow regulator
out of the equation. It’s a good idea to remove
the ball valve handles once the system is
completed to avoid nuisance service calls.
Hose kits are optional, but make for an easier
installation, since the P/T ports and connections
are included. The hose also helps to isolate the
heat pump from the piping system.
Since the heat pump can operate at lower
waterflow on first stage, two stage units
typically include two water solenoid valves
to save water. The flow regulators should be
sized so that when one valve is open the unit
Toflow rate, and when
operates at first stage
Loopthe unit operates at
both valves are open,
Field
full load flow rate. For
example, a 4 ton unit
needs approximately 4 GPM on first stage, and
From
approximately 7 GPM at full load. The flow
Loop
regulator after the first valve
Flush should be 4 GPM,
Field
Valve the second valve
and the flow regulator after
should be 3 GPM. When both valves are open,
the unit will operate at 7 GPM.
The drawings show typical components, wiring
and connection points. Electrical connections
are found at the control box terminal strips.
S
*Hose
Kits
P/T Ports
OR
Single Stage
Units
**Flow
Regulator
S
Source Out
P/T Ports
Note: All YT models are
two-stage units.
Source In
Equipment Pad
2” Polyethylene Foam
Boiler
Strainer
Ball Valve
Drains (optional) (2 required)
(2 required)
*Hose kit is used for piping isolation, and includes fittings for P/T ports.
**See product specifications for flow rates.
Enertech Global
34
Two-Stage solenoid example
is optional for all sizes. It is not
recommended for 3 ton and
smaller. Use single solenoid
and flow regulator.
IOM, YT Models
SECTION 6: UNIT PIPING INSTALLATION
OPEN LOOP SINGLE STAGE SOLENOID CONNECTIONS
OPEN LOOP TWO-STAGE SOLENOID CONNECTIONS
2nd STAGE
IOM, YT Models
35
Enertech Global
SECTION 7: DESUPERHEATER INSTALLATION
Desuperheater Installation
Units that ship with the desuperheater function
also ship with a connection kit. Installation of the
kit and examples of connection to the potable
water system is described in the follwing steps
and drawings.
8. Thread the drain valve into the other end of
the nipple.
ALL ENERTECH DESUPERHEATER WATER TO
REFRIGERANT HEAT EXCHANGERS ARE
DOUBLE WALLED AND VENTED FOR USE IN
POTABLE WATER SYSTEMS.
10.Insert the copper tee in the cold water line.
ALL Enertech Global products meet the
requirements of NSF-372 (Lead Free).
Copper is the only approved material for
desuperheater piping.
into the end of the tee closest to the heat
pump.
9. Above the water heater, cut the incoming
cold water line. Remove a section of that
line to enable the placement of the copper
tee.
11.Thread the remaining two ½”SWT x ¾”MPT
copper adaptors into the ¾” FPT fittings on
the heat pump, marked HWG IN and HWG
OUT.
12.Run interconnecting ½” copper pipe from
the HOT WATER OUT on the heat pump, to
the copper adaptor located on the tee at
the bottom of the water heater.
Note: Units that are shipped with a
desuperheater do not have the desuperheater
pump wires connected to the electrical circuit,
to prevent accidentally running the pump while
dry. Pump has to be connected to the electric
circuit (master contactor) when the lines from
the water heater are installed & air is removed.
13.Run interconnecting ½” copper pipe from
the HOT WATER IN on the heat pump, to the
copper tee in the cold water line.
PLUMBING INSTALLATION
Note: All plumbing and piping connections
must comply with local plumbing codes.
15.Shut off the valve installed in the
desuperheater line close to the tee in the
cold water line. Open the air vent and all
shut off valves installed in the “hot water ou
t”.
TIP: Measure the distance above the floor or
shelf that the water heater is setting on, to
where the drain valve is located. This distance
must be greater than one-half the width of the
tee you’re about to install, or you won’t be able
to thread the tee on to the water heater.
1. Disconnect electricity to water heater.
2. Turn off water supply to water heater.
3. Drain water heater. Open pressure
relief valve.
4. Remove drain valve and fitting from water
heater.
5. Thread the ¾” MPT x 3-1/2” nipple into the
water heater drain port. Use Teflon tape, or
pipe dope on threads.
6. Thread the center port of the ¾” brass tee
to the other end of the nipple.
14.Install an air vent fitting at the highest point
of the line from step 13 (assuming it’s the
higher of the two lines from the heat pump
to the water heater).
16.Turn the water supply to the water heater
on. Fill water heater. Open highest hot water
faucet to purge air from tank and piping.
17.Flush the interconnecting lines, and check
for leaks. Make sure air vent is shoutoff when
water begins to drip steadily from the vent.
18.Loosen the screw on the end of the
despuerheater pump to purge the air from
the pump’s rotor housing. A steady drip
of water will indicate the air is removed.
Tighten the screw and the pump can be
connected to the contactor or teminal
block.
19.Install 3/8” closed cell insulation on the lines
connecting the heat pump to the water
heater.
20.Reconnect electricity to water heater.
7. Thread one of the copper adaptors
Enertech Global
36
IOM, YT Models
SECTION 7: DESUPERHEATER INSTALLATION
CONTENTS OF THE DESUPERHEATER FITTING KIT:
• (1) p/n 20D052-01NN, Installation Instructions
• (1) p/n 33P211-01BN, 3/4”x 3/4”x 3/4” FPT
Brass Tee
• (1) p/n 33P210-01NN, ¾” Boiler Drain Valve
• (1) p/n 11080005001, ¾” MPT x 3-1/2” Brass
Nipple
• (3) p/n 11080006001, ½” SWT x ¾” MPT
Copper Adaptor
• (1) p/n 11080007001, ¾” x ¾” x ½” SWT
Copper Tee
⚠ WARNING ⚠
TO AVOID SERIOUS INJURY, IT IS
RECOMMENDED THAT AN ANTI-SCALD
MIXING VALVE IS INSTALLED ON THE HOT
WATER SUPPLY LINE INTO THE HOME. EVEN
THOUGH HOT WATER TANK TEMPERATURES
COULD APPEAR TO BE SET AT LOWER
LEVELS, HIGH TEMPERATURE WATER FROM
THE DESUPERHEATER COULD RAISE TANK
TEMPERATURES TO UNSAFE LEVELS.
Water Heater Connection Kit Assembly for
Bottom of Water Heater
Note: Drawing shown vertically for detail. Fitting
installs horizontally into hot water tank.
Connection to Hot
Water Tank
Copper Tee
For Domestic
Cold Water In
Line
Drain
Brass Tee
Adapter to Unit
Water Line
IOM, YT Models
37
Enertech Global
SECTION 7: DESUPERHEATER INSTALLATION
Desuperheater Installation with Single Water Heater
Hot Water
Cold Water
Supply
Shutoff
Valves
Air Vent
Located at
System
High Point
Left
View
Unit Water
Connection Detail
Air
Coil
Hot Water IN
Water Heater
(or Storage Tank)
Hot Water Out
3/4” Copper
Adapter Fitting
HWG In
HWG Out
Drain
Valve
Shutoff
Valves
Equipment Pad
2” Polyethylene Foam
Desuperheater Installation with Preheat Tank
Cold Water
Supply
Hot Water
Cold Water
Supply
Hot Water
Shutoff
Valves
System
Air Vent
High Point
Left
View
Unit Water
Connection Detail
Air
Hot Water In
Coil
Hot Water Out
Water Heater No. 2
(or Storage Tank)
Water Heater No. 1
(or Storage Tank)
HWG In
3/4” Copper
Adapter Fitting
HWG Out
Drain
Valve
Enertech Global
Drain
Valve
Shutoff
Valves
Equipment Pad
2” Polyethylene
Foam
Representative drawing only, some models may vary in appearance.
38
IOM, YT Models
SECTION 8: AUXILIARY HEATER INSTALLATION
Auxiliary Heater Nomenclature Decoder
D
Section 2: Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and Note
The signal words Danger, Warning, Caution,
and Note are used to identify levels of hazard
seriousness. The signal word Danger is only
used on product labels to signify an immediate
hazard. The signal words Warning, Caution,
and Note will be used on product labels and
throughout this manual and other manuals that
may apply to this product.
“NOTICE” Notification of installation, operation
or maintenance information which is important,
but which is NOT hazard-related.
SIGNAL WORDS IN MANUALS
The signal word WARNING is used throughout
this manual in the following manner:
⚠ WARNING ⚠
The signal word CAUTION is used throughout this
manual in the following manner:
⚠ CAUTION ⚠
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or on product labels.
“CAUTION” Indicates a potentially hazardous
situation or an unsafe practice which, if not
avoided, COULD result in minor or moderate
injury, product or property damage.
⚠ CAUTION ⚠
“WARNING” Indicates a potentially hazardous
situation which, if not avoided, COULD result in
death or serious injury.
CUT HAZARD
FAILURE TO FOLLOW THIS CAUTION MAY
RESULT IN PERSONAL INJURY.
“DANGER” Indicates an immediate hazardous
situation which, if not avoided, WILL result in
death or serious injury.
SHEET METAL PARTS MAY HAVE SHARP
EDGES OR BURRS. USE CARE AND WEAR
PROTECTIVE CLOTHING AND GLOVES
WHEN HANDLING PARTS.
“Note:” Used to highlight suggestions which will
result in enhanced installation, reliability,
or operation.
IOM, YT Models
39
Enertech Global
Section 3: Introduction
INTRODUCTION
The AHTR Revision D electric heaters are
designed specifically for the Enertech YT
Series Geothermal Heat Pump Units. Good
performance depends on proper application
and correct installation. The information
contained within this manual is intended for
use by a qualified service technician familiar
with safety procedures and equipped with the
proper tools and test instruments.
⚠ WARNING ⚠
ELECTRICAL SHOCK HAZARD
FAILURE TO FOLLOW THIS WARNING
COULD RESULT IN PERSONAL INJURY,
PROPERTY DAMAGE AND/OR DEATH.
INSTALLATION OR REPAIRS MADE BY
UNQUALIFIED PERSONS CAN RESULT IN
HAZARDS TO YOU AND OTHERS.
UNIT PROTECTION
Protect units from damage and contamination
due to plastering (spraying), painting and
all other foreign materials that may be used
at the job site. Keep all units covered on the
job site with either the original packaging or
equivalent protective covering. Cap or recap
unit connections and all piping until unit is
installed. Precautions must be taken to avoid
physical damage and contamination which
may prevent proper start-up and may result in
costly equipment repair.
OVERVIEW
THE AHTR electric heater kits are designed and
approved for use with specific YT unit models.
Table 1 lists all of the possible combinations.
Table 1: Heater Compatibility
INSTALLATION MUST CONFORM WITH
LOCAL BUILDING CODES OR, IN THE
ABSENCE OF LOCAL CODES, WITH
NATIONAL ELECTRICAL CODE ANSI/
NFPA 70-2014 OR CURRENT EDITION.
INSPECTION
Upon receipt of this geothermal accessory,
carefully check the shipment against the
packing slip and the freight company bill of
lading. Verify that all units and packages have
been received. Inspect the packaging of each
unit for damages. Insure that the carrier makes
proper notation of all damages and shortage
on all bill of lading papers. Concealed
damage should be reported to the freight
company within 15 days. If not filled within 15
days, the freight company can deny all claims.
Note: Notify the Enertech Global, LLC shipping
department of all damages within 15 days. It
is the responsibility of the purchaser to file all
necessary claims with the freight company.
Enertech Global
Electric Heat
Model
Description
YT
AHTR051D
5kW, 60Hz, 1 Phase, w/
Circuit Breaker
024
AHTR101D
10kW, 60Hz, 1 Phase, w/
Circuit Breaker
024-072
AHTR151D
15kW, 60Hz, 1 Phase, w/
Circuit Breaker & Single
Point Connection
036-072
AHTR201D
20kW, 60Hz, 1 Phase, w/
Circuit Breaker & Single
Point Connection
060-072
Note: All heaters are only approved for use
on single phase, 208/230V units. The 15kW
and 20kW heaters come with a single point
connection jumper bar assembly already
installed.
Components
Each AHTR electric heat kit should contain the
following items:
• (QTY: 1) Electric Heat Module Assembly
• (QTY: 1) Filler plate (Only in AHTR101D)
• (QTY: 4) #10-16 x ½ Mounting Screws (Only in
AHTR101D)
40
IOM, YT Models
Section 4: Installation
Mounting the Heater
heater may need to be removed to provide
better access to the mounting holes in the
back of the heater. However, they must be
replaced once the heater has been properly
mounted.
1. Shut OFF electrical power at unit disconnect
switch or service panel.
2. Remove the upper front panel from the
unit. To do this, first remove the center insert
panel by placing a flat blade screwdriver
in the gap on one side and gently pulling
outward.
3. Locate the blank filler plate in the plenum,
above the blower wheel. Remove the (4)
screws holding down the plate. Remove
the plate and set aside the (4) screws for
mounting the heater. See Figure 1.
6. If installing a 10kW heater on a YT036, YT048,
YT060, or YT072 model, first install the filler
plate on the plenum. There are (4) #10-16
x ½ screws provided in the kit to mount this
filler plate. See Figure 3.
REMOVE (4) SCREWS HOLDING
DOWN BLANK PLENUM PLATE
USE (4) SCREWS PROVIDED IN
KIT TO ATTACH PLATE TO PLENUM
FILLER PLATE- INSTALL ONLY
WITH 10KW HEATERS ON
*YT036-*YT072 MODELS
FIGURE 3
USE (4) SCREWS PROVIDED IN
KIT TO ATTACH PLATE TO PLENUM
FIGURE 1
7. Insert the heater into the opening of the filler
plate that was just installed, and secure the
electric heater in place with the (4) screws
that were removed from the plenum filler
plate. See Figure 4.
SCREW HEATER IN PLACE USING
(4) SCREWS THAT WERE HOLDING
BLANK PLATE
4. Remove the cover from the heater, in order
to have access to the (4) mounting holes.
SCREW HEATER IN PLACE USING
(4) SCREWS THAT WERE HOLDING
BLANK PLATE
*NOTE: MAY NEED TO REMOVE
PLASTIC BUSHINGS TO HAVE
BETTER ACCESS TO MOUNTING
HOLES.
FILLER PLATE- INSTALL ONLY
WITH 10KW HEATERS ON
*YT036-*YT072 MODELS
Notice: If installing a 10kW heater (AHTR101D)
on a YT036, YT048, YT060, or YT072 model, skip to
Step #6.
REMOVE (4) SCREWS HOLDING
DOWN BLANK PLENUM PLATE
FIGURE 3
5. Insert the heater into the plenum opening.
Exercise caution in order to prevent
damage to the heater elements. The heater
FIGURE 2
elements should be
over the blower wheel
opening. Secure the heater in place with
the (4) screws that were removed from the
FIGURE 1
plenum filler plate.
See Figure 2.
SCREW HEATER IN PLACE USING
(4) SCREWS THAT WERE HOLDING
BLANK PLATE
FIGURE 4
SCREW HEATER IN PLACE USING
(4) SCREWS THAT WERE HOLDING
BLANK PLATE
Notice: Installation of Heater in Right Hand
Return Configuration (AHTR151D and AHTR201D
only): If the unit is going to be installed as a
right hand return unit, the circuit breakers
(along with the single point connection jumper
bar assembly) will need to be removed and
rotated 180 degrees, so the OFF position of
the circuit breakers will be pointed DOWN
when the heater is installed. This is an NEC
requirement. Do one breaker at a time to
*NOTE: MAY NEED TO REMOVE
PLASTIC BUSHINGS TO HAVE
BETTER ACCESS TO MOUNTING
HOLES.
FIGURE 2
Note: The plastic bushings on the side of the
IOM, YT Models
FIGURE 4
41
Enertech Global
make sure the wires are reconnected properly.
Loosen terminal screws, and gently pull wires
back from breaker. Remove the screws
securing the breaker to the heater, and rotate
180 degrees. Make sure when the breakers
and single point connection jumper bar
assembly are being rotated, the screw holes
circled in figure 5B are utilized. If the original
holes are used the screws will interfer with the
plenum. Screw breakers back in place, and
reconnect the wires to the breakers, using a
torque of 35 inch pounds. The blank plate and
(2) screws, over the opening in the cover for
the circuit breakers, will also need to be rotated
and re-installed. See figure 5A.
RIGHT RETURN CONFIGURATION ONLY!
CIRCUIT BREAKERS AND COVER PLATE
MUST BE ROTATED 180°, AND RE-INSTALLED.
10.Remove the cap plug on the side of the
electric heat control box, and pull the
supply wires through.
Note: U.S. CUSTOMERS ONLY!! When installing a
15kW or 20kW heater in the U.S., the single point
connection bar assembly may be removed.
In this case, refer to the second Electrical
Data Table in Section 5 for appropriate wire
gauge and maximum size for the over current
protection device.
FIGURE 5A
11.Connect supply voltage wires to the line
side of the circuit breakers/single point
connection jumper bar assembly, and
connect the ground wire to the open
ground lug. See wiring diagram label, or
wiring schematics in Section 6, to verify
placement of all connections.
RIGHT RETURN CONFIGURATION ONLY!
WHEN ROTATING CIRCUIT BREAKERS,
MAKE SURE TO USE OTHER SET OF
HOLES (CIRCLED) TO MOUNT THEM
BACK IN PLACE.
FIGURE 5B
Low Voltage Wiring
8. Connect the 6-pin low voltage, heater
wiring harness connector to the bottom of
the control box, from inside the cabinet.
Some of the insulation on the bottom of
the control box will need to be trimmed
away in order to expose the cut-out for the
connector. The mating half of the harness
is already installed in the control box. A
perfect match and positive connection
must be made between the plug and
receptacle.
Caution: All line voltage connections MUST be
made with copper wire. The power supply
wiring MUST have overcurrent protection. This
can either be fuses or circuit breakers. The
maximum size for the overcurrent protection
device is shown in the column labeled MOCP in
the Electrical Data Table in Section 5.
12.Permanently ground the electric heater
in accordance with local codes and
ordinances and in the United States, with
the current edition of the National Electrical
Code. Use a copper conductor of the
appropriate size from the electric heat
ground lug, to a grounding lug on the circuit
breaker panel.
Power Supply Wiring
9. Remove the cap plug in the top of the
unit, labeled ‘AUX HEAT POWER SUPPLY.’
Route the power supply wires for the heater
through this hole, down to the side of the
electric heater control box. See Figure 6.
Enertech Global
FIGURE 6
42
IOM, YT Models
Air Flow
13.Airflow requirements are different between
models. Please refer to the unit Installation
Instructions for airflow set-up information.
Temperature Rise Check
14.To determine temperature rise, measure the
temperature difference between the supply
and return air temperatures.
15.Note: The maximum outlet air temperature
for all models is 200°F (93.3°C)
Section 5: Electrical Data
Technical Data Single Phase w/ Circuit Breaker
Heat kW
Heater Model
Supply Circuit
Number
AHTR051D
Single
240
5
208
3.75
AHTR101D
Single
10
7.5
AHTR151D*
Single
15
11.25
AHTR201D*
Single
20
15
Heater kW Per
Circuit
240
2.5
5
5
5
10
10
10
208
1.875
3.75
3.75
3.75
7.50
7.50
7.50
FLA
Total
AMPS
Recommended
MOCP Maximum
Branch Circuit Conductor
Ground
Overcurrent
75°C Copper
Wire
MCA- Minimum
Protective
NEC 310.15(B)(16), Ch. 9 Table 9 NEC 250.122
Circuit Ampacity
Device (AMPS)
Min Wire
Max
Min Wire
NEC 240.4(B)
# of
Size (AWG) Length (ft) Size (AWG)
Wires
240
208
240
208
240
208 240 208 240
208
10
26.0
22.5
30
25
2
10
12
144
87
240
20.8
208
18.0
41.7
36.1
52.1
45.1
60
50
2
6
8
176
111
62.5
54.1
78.1
67.6
80
70
2
4
4
186
186
83.3
72.1
104.2
90.1
110
100
2
2
3
216
173
8
10
8
6
8
*Single Point Connection
Heater Model
AHTR151D
AHTR201D
Technical Data (US Customers ONLY!!) Single Phase w/ Circuit Breaker- Single Point Connection Removed
Recommended
MOCP Maximum
Branch Circuit Conductor
Ground
FLA
Overcurrent
75°C Copper
Wire
Heater kW Per
MCA- Minimum
Heat kW
Total
Protective
Supply Circuit
NEC 310.15(B)(16), Ch. 9 Table 9 NEC 250.122
Circuit
Circuit Ampacity
AMPS
Device (AMPS)
Number
Min Wire
Max
Min Wire
NEC 240.4(B)
# of
Size (AWG) Length (ft) Size (AWG)
Wires
240
208
240
208
240
208
240
208
240
208
240
208 240 208 240
208
10
L1/L2
5
3.75
20.8
18.0
26.0
22.5
30
25
2
10
12
144
87
15
11.25
10
L3/L4
10
7.50
41.7
36.1
52.1
45.1
60
50
2
6
8
176 111
10
L1/L2
10
7.50
41.7
36.1
52.1
45.1
60
50
2
6
8
176 111
20
15
10
L3/L4
10
7.50
41.7
36.1
52.1
45.1
60
50
2
6
8
176 111
Note: Supply voltage, amperage, fuse, and disconnect switch sizes MUST conform to all technical
specifications in this manual and on the unit rating plate.
IOM, YT Models
43
Enertech Global
SECTION 9: ELECTRICAL CONNECTIONS
High and Low Voltage Single Phase Connections
Thermostat
L
W
G
O
Y2
Y1
R
C
R
HUM
YU
YT
A
HW
External
Loop
Pump(s)
ODD
L2 Power
L1 Supply
E NE R T E C H G L OB A L , L L C
2506 S. E L M ST R E E T
G R E E NV I L L E , I L 62246
(618) 664-9010
Notes:
Drawings represent a typical installation using wiring input knockouts marked on the outside of the control box cover.
National and local electrical codes must be followed during installation of this unit.
Use caution to avoid damaging the wiring and components during installation.
Wiring shall be routed to avoid contact with other connections and temperature sensitive components.
Assure all connections are seceurely fastened and routed to their proper locations.
Install the thermostat per the manufacturer’s instructions provided with that unit.
Enertech Global
44
IOM, YT Models
◊
SECTION 10: CONTROLS
Microprocessor Features and Operations
Enertech Global geothermal heat pump
controls provide a unique modular approach
for controlling heat pump operation. The
control system uses one, two, or three printed
circuit boards, depending upon the features
of a particular unit. This approach simplifies
installation and troubleshooting, and eliminates
features that are not applicable for some units.
located on the lockout board. It should be
reinstalled for normal operation after testing.
The status LED will not be illuminated during the
TEST mode.
A microprocessor-based printed circuit board
controls the inputs to the unit as well as outputs
for status mode, faults, and diagnostics. A status
LED and LED(s) for each fault are provided
for diagnostics. Water-to-air models may offer
an ECM control board option providing field
selectable airflow and dehumidification mode,
plus an LED to indicate CFM (100 CFM per
flash).
A removable low voltage terminal strip
provides the necessary terminals for thermostat
connections. Some models offer an additional
removable terminal strip for accessory wiring
connections.
Water Solenoid Valve Connections
When provided, the YT & YU on the accessory
terminal strip provides a field connection
for a valve with an end switch, which is
recommended. (The YT terminal can be used
to power the solenoid valve and end switch.
The YU terminal can be powered through the
end switch and connects to the Y1 circuit
of the unit controls - see wiring diagram). An
accessory relay terminal, “A”, can be used
for solenoid valves without an end switch. This
terminal is energized 10 seconds before the
compressor contactor. A valve without an end
switch could cause a water hammer issue and
is not recommended.
Short Cycle Protection (ASC)
A built-in five minute anti-short cycle (ASC)
timer provides short cycle protection of the
compressor.
Airflow Monitor
A LED on the ECM fan control board flashes
one time per 100 CFM when the unit’s fan is
operating to indicate airflow.
Component Sequencing Delays
Components are sequenced and delayed for
optimum space conditioning performance
and to make any startup noise less noticeable.
There is a short delay between the blower
motor and the compressor start up.
ECM Board Layout
CFM
Startup/Random Start
The unit will not operate until all the inputs
and safety controls are checked for normal
conditions. A ten to twenty second random
start delay is added at power up and
whenever a Y1 call is received. This avoids
multiple units from being energized at the same
time after power loss or other situations.
Humidifier/Dehumidification Connections
Connections for a humidistat are provided for
some models, which automatically engage
the fan when the humidistat contact closes.
In addition, a field connection is provided
at the terminal strip for external control of
the On Demand Dehumidification (ODD)
feature for the variable speed ECM fan motor,
which automatically lowers the fan speed
when the space humidity is higher than the
set point. Either connection may be used
with a thermostat that includes humidifier/
dehumidification outputs.
W1
COM2
24VAC XFMR
SEC
O/B Y1 G W1 R ODD W2 Y2 C
ECM
Board
Test Mode
The microprocessor control allows the
technician to shorten timing delays for faster
diagnostics by removing the TEST jumper
IOM, YT Models
COM
45
Enertech Global
SECTION 10: CONTROLS
Lockout Board Layout
CCG
CCG1
Resistance Heat Control
The resistance heat control module contains
the appropriate high-voltage control relays.
Low voltage control signals from the lockout
board energize the relays in the resistance heat
module to engage backup resistance heat
when necessary. The lockout board offers a
pass through W1 (1st Stage) and a relay output
for W2 (2nd Stage). See staging in sequence of
operation section.
CC
A
C
R
Y1
Electronic Condensate Overflow Protection
The control board utilizes an impedance
sensing liquid sensor at the top of the drain
pan. When water touches the sensor, CO fault
occurs. If the fault is present for 30 continuous
seconds, the lockout board indicates a
condensate overflow fault has occurred.
Loop Pump Circuit Breakers
The loop pump(s) and HWG pump are
protected by control box mounted circuit
breakers for easy wiring of pumps during
installation. Circuit breakers eliminate the need
to replace fuses.
Safety Controls
The lockout board receives separate signals
for high pressure, low pressure, low load heat
exchanger freeze, source heat exchanger
freeze, condensate overflow, and hot gas
temperature limit faults. Upon a continuous
30-second measurement of all faults, except
the high pressure fault, the compressor
operation is suspended. The high pressure
fault is immediate. The combination of LED(s)
indicate each fault. Once the unit is locked
out (see fault retry below), an output of 24VAC
is energized on the “L” terminal for remote
indication of a fault at the thermostat.
Low Pressure-LP: If the low pressure switch
is open continuously for 30 seconds, the
compressor operation will be interrupted, and
the control will go into fault retry mode. At
startup, the low pressure switch is not monitored
for 30 seconds to avoid nuisance faults. (If the
low pressure switch is open before startup then
the unit will not start upon receiving an Y1 call
and will lock out instead.)
Enertech Global
HWG W2
G W1 Y2
R_2 R_1 C_2 C_1
HP
Lockout
Board
LP
FSW
AFRZ
TEST
O/V
FS
L
O O
CO
UART
1 2 3 4
STATUS
High Pressure-HP: If the high pressure switch
opens, the compressor operation will be
interrupted, and the control will go into fault
retry mode. There is no delay between the time
the switch opens and the board entering into
fault retry mode. There is also no delay of switch
monitoring at startup. (If the high pressure switch
is open before startup then the unit will not
start upon receiving an Y1 call and will lock out
instead.)
Load Heat Exchanger Freeze-T1: When
in cooling mode, if the heat exchanger
temperature is lower than 30°F for 30 continuous
seconds, the compressor operation will be
interrupted, and the control will go into fault retry
mode. This sensor is located on the refrigerant
line in between the heat exchanger and TXV
(refrigerant inlet of heat exchanger in cooling
mode).
Source Heat Exchanger Freeze (Flow
Sensing)-T4: When in heating mode, if the
heat exchanger is lower than setpoint for 30
continuous seconds, the compressor operation
will be interrupted, and the control will go into
fault retry mode. The setpoint is 15°F for closed
loop (A-FRZ jumper removed) and 30°F (A-FRZ
jumper installed) for open loop. At startup, the
flow sensor is not monitored for 30 seconds to
avoid nuisance faults. This sensor is located on
the refrigerant line in between the source heat
exchanger and TXV (refrigerant inlet of heat
exchanger in heating mode).
46
IOM, YT Models
SECTION 10: CONTROLS
Condensate Overflow: If water touches the
condensate overflow sensor for 30 continuous
seconds, the compressor operation will be
interrupted. The control will go into fault retry
mode. There is no delay of switch monitoring at
startup.
Hot Gas Line Temperature limit (T2>220°F):
When T2 is >220°F for 30 continuous seconds,
the compressor operation will be interrupted.
The control will go into fault retry mode.
Temperature Sensor Operating Range
Sensors’ Name
Range (°F)
T1
10 – 220
T2
20 – 257
T3
20 – 220
T4
10 – 220
Temperature vs Resistance Characteristics of
Sensor
Temp. (°F)
10
15
20
30
77
Rst. (KΩ)
46.95
41.39
36.50
28.61
10.00
Temp. (°F)
130
200
220
250
257
Rst. (KΩ)
3.60
1.16
0.87
0.59
0.54
Over/Under Voltage Protection
The lockout board protects the compressor
from operating when an over/under voltage
condition exists. The control monitors secondary
voltage (24VAC) to determine an over/under
voltage condition is occurring on the primary
side of the transformer. For example, if the
secondary voltage is 18VAC, the primary
voltage for a 240V unit would be approximately
180V which is below the minimum voltage
(197V) recommended by the compressor
manufacturer. Under voltage (<18VAC) causes
the compressor to disengage and restart when
the voltage returns to >20VAC. Over voltage
(>31VAC) causes the compressor to disengage
and restart when the voltage returns to <29VAC.
When an O/U Voltage condition occurs,
the board will initiate a fault, shut down the
compressor, and start the five minute ASC
period. All four fault LEDs will flash (HP + LP + FS
+ CO) and the thermostat “Call For Service”
IOM, YT Models
indicator will be illuminated. This feature is selfresetting and never retries or locks out. If voltage
returns to normal range normal operation will
resume if/when the ASC period is over. When
normal operation is restored the four fault LED’s
will stop flashing and the “Call For Service”
indicator will turn off.
Fault Retry
All faults (except O/U Voltage) are retried twice
before finally locking the unit out. The fault retry
feature is designed to prevent nuisance service
calls. There is an anti-short cycle (ASC) period
(5 min.) between fault retries. On the third fault
within 30 minutes, the board will go into lockout
mode and the “Call For Service” indicator on
the thermostat will illuminate.
Intelligent Lockout Reset
If the thermostat is powered off for one minute
then back on (soft reset), the board will reset
and the last fault will be stored in memory for
ease of troubleshooting. If power is interrupted
to the board, the fault memory will be cleared.
Lockout with Emergency Heat
While in lockout mode, if the thermostat is
calling for auxiliary heat (W1), emergency heat
mode will energize. W2 is energized two minutes
after W1 is energized.
Hot Water Generator (HWG) Pump Control
Controls check for HWG temperature (T3) and
hot gas (compressor discharge) line (HGT)
temperature (T2). The hot water generator
pump is de-energized when the leaving water
temperature (T3) is above 130°F or when the
compressor discharge line (T2) is cooler than
leaving water temperature (T3). Also when
the hot gas line temperature (T2) is higher than
220°F, the HWG pump will be de-energized.
All of the issues above will break the circuit
of the HWG pump (via the HWG signal from
the lockout board) and will not lockout the
compressor except when T2>220°F. Units
without a HWG also do not have sensors T2 and
T3. The control ignores T2 and T3 and disables
Faults 15 and 16, Sensor BAD.
47
Enertech Global
SECTION 10: CONTROLS
LED Identification
LEDs
Fault
Code
Condition
01
Normal Mode
02
Test Mode
03
High Pressure Fault (HP)
04
High Pressure Lockout (HP)
05
Green
HP
Orange
LP
Red
FS
Yellow
CO
Green
Status
L
Terminal
-
-
-
-
Flash
-
Notes
-
-
-
-
-
-
Flash
-
-
-
Flash
-
1
On
-
-
-
Flash
On
Low Pressure Fault (LP)
-
Flash
-
-
Flash
-
06
Low Pressure Lockout (LP)
-
On
-
-
Flash
On
07
Source Heat Exchanger
Freeze/Water Flow Fault (T4/
FS)
-
-
Flash
-
Flash
-
2
08
Source Heat Exchanger
Freeze/Water Flow Lockout
(T4/FS)
-
-
On
-
Flash
On
2
09
Load Heat Exchanger Freeze
Fault (T1)
-
Flash
Flash
-
Flash
-
3,4
10
Load Heat Exchanger Freeze
Lockout (T1)
-
On
On
-
Flash
On
3,4
11
Condensate Fault (CO)
-
-
-
Flash
Flash
-
12
Condensate Lockout (CO)
-
-
-
On
Flash
On
13
Over/Under Voltage
Flash
Flash
Flash
Flash
Flash
On
14
Sensor T1 Bad Lockout
Flash
-
-
On
Flash
Flash
5
15
Sensor T2 Bad
-
Flash
-
On
Flash
Flash
5, 8
16
Sensor T3 Bad
-
-
Flash
On
Flash
Flash
5, 8
17
Sensor T4 Bad Lockout
-
On
-
Flash
Flash
Flash
5
18
T1 & T4 Swapped
On
-
-
On
-
Flash
6
19
HGT(T2) > 220F Fault
Flash
-
Flash
On
Flash
-
7
20
HGT(T2) > 220F Lockout
On
-
On
On
Flash
On
7
Notes:
1. When the TEST jumper is removed, the green status LED will be off.
2. The source heat exchanger freeze/water flow fault sensor is located between the TXV and source heat
exchanger.
3. The load heat exchanger freeze sensor is located between the TXV and the load heat exchanger.
4. Only package and Water-to-Water models have this feature.
5. This fault indicates a bad sensor - open, shorted, disconnected, or invalid value.
6. Check for T1 & T4 being swapped (only shown in TEST mode).
7. Hot Gas Line temperature is too high (>220F).
8. Units without HWG do not use sensors T2 and T3. The control will disable faults 15 and 16.
Enertech Global
48
IOM, YT Models
SECTION 10: CONTROLS
Diagnostics:
The lockout board includes five LEDs (Green-HP,
Orange-LP, Red-FS, Yellow-CO, Green-Status) for
fast and simple control board diagnosis. Refer to
the LED Identification table for LED function.
LOCKOUT BOARD JUMPER SELECTION
The lockout board includes four jumpers for field
selection of various board features.
LOAD/SOURCE HX TEMPERATURE SENSING (FS)
When the FS jumper is installed (T1 and T4
monitored, FS terminals ignored), the board
operates in the load and source heat
exchanger temperature sensing mode, which is
the factory setting.
ANTI-FREEZE (A-FRZ)
When the jumper is installed, the board
operates in open loop mode. The setpoint for
the source heat exchanger freeze sensor is 30°F.
When the A-FRZ jumper is removed, the board
operates in the closed loop mode. The setpoint
for the source heat exchanger freeze sensor is
15°F.
TEST MODE (TEST)
When the TEST jumper is installed, the board
operates in the normal mode. When the
jumper is removed, the board operates in test
mode, which speeds up all delays for easier
troubleshooting. While in the test mode the
T1 & T4 sensors will be checked for the proper
location based on temperature. Sensors
are swapped if T1>T4 in cooling or T1<T4 in
heating. This fault will only show up in the test
mode. When service is complete, the jumper
must be re-installed in order to make sure the
unit operates with normal sequencing delays.
While the test jumper is removed, the status
light (bottom green) will remain off. If the test
jumper is not re-installed the control will revert
to normal mode after one (1) hour, green status
light blinking.
OVER/UNDER VOLTAGE DISABLE (O/U)
When the O/U jumper is installed, the over/
under voltage feature is active. When the
jumper is removed, the over/under voltage
feature is disabled. On rare occasions,
variations in voltage will be outside the range
of the over/under voltage feature, which
IOM, YT Models
may require removal of the jumper. However,
removal of the jumper could cause the unit to
run under adverse conditions, and therefore
should not be removed without contacting
technical services. An over/under voltage
condition could cause premature component
failure or damage to the unit controls. Any
condition causing this fault must be thoroughly
investigated before taking any action
regarding the jumper removal. Likely causes of
an over/under voltage condition include power
company transformer selection, insufficient
entrance wire sizing, defective breaker panel,
incorrect 24VAC transformer tap (unit control
box), or other power-related issues.
Sequence of Operation:
The description below is based on Water-to- Air
Units, Two-Stage Compressor, with ECM Fan.
Timings assume the ASC timer is expired. If the
ASC timer is not expired the ECM fan will start
immediately but the Accessory, compressor,
and loop pump operation do not start until the
ASC timer is expired.
Heating 1st Stage, (Y1, G) Two-Stage Units
The ECM fan immediately ramps up to 75%
of 1st stage airflow (CFM) level (based on DIP
switch settings), the Accessory (A) terminal
output is energized after the random start timer
(10s-20s) expires then first stage compressor and
the loop pump(s) are energized 10 seconds
after A. The ECM fan adjusts to 100% (of 1st
stage operation) CFM level 90 seconds after
the “Y1” input.
Heating 2nd Stage, (Y1, Y2, G) Two-Stage Units
The ECM fan adjusts to 2nd stage airflow (CFM)
level (based on DIP switch settings), and the
compressor full load solenoid is energized.
Heating 3rd Stage, (Y1, Y2, W1, G) Two-Stage
Units
When provided, the ECM fan remains at 100%
of 2nd stage airflow (CFM) level (based on DIP
switch settings), and the first stage of electric
resistance heat is energized. Second stage of
electric resistance heat (W2) is energized ten
minutes after first stage electric resistance heat
(W1) is energized. (W2 is only available with
10kW, 15kW and 20kW electric heaters)
49
Enertech Global
SECTION 10: CONTROLS
Emergency Heat (W1, G)
The fan is started immediately at 2nd stage
airflow (CFM) level (based on DIP switch
settings), and the electric resistance heat is
energized. Second stage of electric heat (W2)
is energized two minutes after first stage electric
heat (W1) is energized. (W2 is only available
with 10kW, 15kW and 20kW electric heaters)
Cooling Operation
The reversing valve is energized for cooling
operation. Terminal “O” from the thermostat is
connected to the reversing valve solenoid.
Cooling 1st stage (Y1, 0, G) Two-Stage Units
The ECM fan immediately ramps up to 75%
of 1st stage airflow (CFM) level (based on DIP
switch settings), the Accessory (A) terminal
output is energized after the random start timer
(10s-20s) expires then first stage compressor and
the loop pump(s) are energized 10 seconds
after A. The ECM fan adjusts to 100% (of 1st
stage operation) CFM level 90 seconds after
the “Y1” input.
airflow (CFM) level. The signal is ignored in the
heating mode.
Fan Only
When the ECM control module receives a “G”
call without a call for heating or cooling, the
fan operates at 50% of the full load airflow
(CFM) level (based on DIP switch settings shown
in following table).
Factory Installed Soft Start Option
All single phase *YT units have the option of a
factory installed Soft Starter. During operation
of the unit, if there is an issue with the soft start
module, a fault signal will be sent to the lockout
board, which in turn will send a fault signal to
the thermostat. To determine the fault of the
soft star module, reference the ‘LED Status
Identification’ chart as listed in the table of
contents.
YT Series Dehumidifica1on Mode Op1ons
Cooling 2nd Stage (Y1, Y2, O, G) Two-Stage
Units
The ECM fan adjusts to 2nd stage airflow (CFM)
level (based on DIP switch settings), and the
compressor full load solenoid is energized.
Cooling, Dehumidification Mode
The ECM fan control board includes two
types of dehumidification modes, Constant
Dehumidification mode, and On Demand
Dehumidification (ODD). If the ECM control
board is set to Constant Dehumidification
mode, the ECM fan runs at normal airflow
(CFM) in all heating stages, but all cooling
operation will be 85% of the current stage
airflow (CFM) level (based on DIP switch
settings). The dehumidification mode lowers
the airflow (CFM) through the evaporator
coil, to improve latent (dehumidification)
capacity. In ODD mode, a humidistat or a
thermostat with a dehumidification output
(output must be reverse logic -- i.e. it must
operate like a humidistat) is connected to the
ODD terminal. When the module receives a
call for dehumidification, the fan runs at 85% of
the current stage airflow (CFM) in the cooling
mode. Otherwise, the airflow is at the normal
Enertech Global
DIP Switch
S9
S10
Mode
ON
OFF
Normal
OFF
ON
ODD
OFF
OFF
Opera1on
Dehumidifica1on mode disabled (normal Htg/Clg CFM) -­‐ factory seAng.
On Demand Dehumidifica1on mode (humidistat input at terminal ODD) -­‐-­‐ Humidistat required.
Constant Dehumidifica1on mode Constant (always uses dehum CFM for Dehum.
cooling and normal CFM for hea1ng) -­‐-­‐ No humidistat required.
Not Used Not an applicable seAng.
ON
ON
Notes:
1. To enter Dehumidifica1on mode, ODD input should be 0 VAC; for normal cooling CFM, ODD input should be 24 VAC.
2. Hea1ng CFM is not affected by dehumidifica1on mode. When in dehumidifica1on mode, cooling CFM is 85% of normal CFM
50
IOM, YT Models
SECTION 11: SOFT START CONTROLS
Soft Start Module
Enertech offers a factory installed single-phase
Soft Start Module that reduces compressor
starting currents and hence limits the peak
energy demand. The Soft Start Module provides
a one-package solution for compressor
softstarting and starting capacitor control.
The Soft Start Module has a dedicated
algorithm and inbuilt current limit settings
specifically for scroll compressor starting. To limit
the peak energy demand resulting in expensive
utility contracts by the end-users.
The Soft Start Module complies with Class B
(residential) limits for conducted and radiated
emissions which ensures that neighbouring
equipment is not negatively affected by any
interference generated by the softstarter
switching.
The Soft Start Module HP provides a dynamic
current limit that ensures compressor starting
even at higher starting pressures.
Wiring Diagram
IOM, YT Models
51
Enertech Global
1. Applicable when current limit is 45 AACrms
2. Safety of household and similar electrical appliances. Particular requirements for electrical heatpumps, airconditioners and dehumidifiers.
3. Auxiliary relay terminal (available on RSBS23..A2V22C24) is not suitable to be connected to accessible SELV circuits.
SECTION
11: dips
SOFT
START CONTROLS
and interruptions
section for mode of operation.
4. Refer to voltage
Mode of Operation
Mode of Operation
Normal Condition (Note 3)
Mains Operational Voltage
Green LED
Control Voltage
Controller Output
Orange LED
3 min.
6 min.
Undervoltage(Note
Condition
(Note 4)
Sottotensione
4)
Linevoltage
voltage<180
<190VAC
VACfor
for<<1 1sec.
sec.
Line
Line
Linevoltage
voltage<180
<190VAC
VACfor
for≥1 1sec.
sec.
MainsOperational
OperationalVoltage
Voltage
Mains
GreenLED
LED
Green
ControlVoltage
Voltage
Control
ControllerOutput
Output
Controller
1 sec
Alarmindication,
indication,Red
RedLED
LED
Alarm
0.5 sec 0.5 sec
5
Specifications are subject to change without notice (03.09.2014)
Enertech Global
52
IOM, YT Models
RSBS2332A2V22C24SM28, RSBS2325A2V22C17SM29
SECTION 11: SOFT START CONTROLS
MODE OF OPERATION (CONT.)
Mode of Operation (cont.)
Overcurrent Condition (Note 5)
Mains Operational Voltage
Green LED
Control Voltage
Controller Output
6 mins.
Over Current Condition
(> 80A for 1 sec.)
6 mins.
Alarm indication, Red LED
Flashing for 5 mins.
Flashing for 5 mins.
Flashing for 5 mins.
Incomplete Ramp Alarm (Note 7)
Mains Operational Voltage
Green LED
Control Voltage
Controller Output
> 1 sec
Alarm indication, Red LED
1 sec.
Flashing for 5 mins.
Notes:
1. The RSBS has 2 indication LEDs on board. The green LED indicates the status of the on-board power supply, whilst the red LED indicates an alarm condition
or in the case of the recovery time between starts, the LED will be orange (Fully ON) .
2. Once the mains voltage is present, the green LED will be fully ON. In case the mains voltage is less than the stated pickup voltage alarm value, the green LED will be
flashing. In case mains voltage is higher than the stated pick-up voltage and green LED is flashing, then this may indicate that the on-board power supply is faulty.
(Power Supply Alarm)
3. Upon closing K1, the RSBS will start ramping, duration of which is < 1 second, provided that the minimum time from stop to start is respected. When opening K1, the
RSBS will stop without any ramp down.
4. In the case of an undervoltage, the RSBS will shut down and the Red LED flashes 2 times as long as the undervoltage is present. Once the mains voltage is restored
the red LED will continue flashing for 5 minutes. After 6 minutes, the RSBS will start ramping function in the case K1 is closed. The device can be reset at any time by
removing power on L1 - N connection. When the power is reapplied, the soft starter will start ramping up as soon as K1 is closed, provided that the minimum time
between starts and the minimum time from stop to start are respected.
5. If an overcurrent (>80A for 1 sec.) is sensed, the RSBS will shut down and the red LED will flash 3 times indicating an overcurrent situation. This continues for 5
minutes. In the case that the overcurrent is still present at the second attempt, user intervention is required to reset the controller by cycling power for the device to
operate again as this implies that there are problems in the system.
6. A detection circuitry provides protection in case of a faulty starting capacitor EMR. In such a situation, the red LED will flash 4 times for 5 minutes. RSBS will check the
status of the starting capacitor EMR before attempting a ramping function (in the case K1 is closed). If the starting capacitor EMR is found faulty at the second
attempt, user intervention is required to reset the controller by cycling power for the device.
7. In the case of incomplete ramping of the softstarter, the red LED will flash 5 times. This flashing will be indicated by the red LED for 5 minutes. If after the second
attempt there is another incomplete ramp alarm, user intervention is required to reset controller.
8. During recovery from Undervoltage, Overcurrent, Incomplete ramp alarms, the red LED will flash at twice the normal flashing frequency, using the same number of
flashes. The figure shows the flashing in case of a recovery from an undervoltage alarm.
9. During the recovery time between starts, the orange LED will be continuously ON until the necessary recovery time elapses.1
10. If supply on RSBS is removed before the recovery period has elapsed, when supply is restored the delay will continue until the remaining recovery time from the
last start/ stop (before supply removal) is over. Following this, another start may be attempted. If supply is removed during alarm recovery (red LED Flashing), upon reapplying supply, the alarm will be reset and the RSBS will only wait for the respective delays between starts and/or stop to start to elapse before attempting another
start ( assuming K1 is closed.)
IOM, YT Models
6
53
Enertech Global
Specifications are subject to change without notice (03.09.2014)
RSBS2332A2V22C24SM28, RSBS2325A2V22C17SM29
SECTION 11: SOFT START CONTROLS
Mode of Operation (Voltage Interuptions)
Mode of Operation (Voltage Dips)
Mains operational voltage
Ue: 230VAC
M
U
140VAC < Ue < 160VAC
9
>= 200ms
0VAC
0
>
Green LED
G
Control Voltage
C
200ms
Controller output
Alarm recovery
Alarm indication, Red LED
C
Flashing
A
O
On
Alarm relay contact
A
Mains operational voltage
Ue: 230VAC
90VAC < Ue < 140VAC
0VAC
>=100ms
Green LED
Control Voltage
100ms
Controller output
Alarm recovery
Alarm indication, Red LED
Flashing
On
Alarm relay contact
Note:
1. When a voltage dip and/or interruption is detected the Under voltage alarm will be triggered (2 flashes on red LED).
2. If, during bypass, the current (Ie) is <=2.5AACrms for Ue>=180VAC, the under-voltage alarm will also be triggered as this might indicate a voltage interruption
condition.
3. Voltage dips/interruptions occurring during recovery between starts and/or alarm recovery shall be ignored.
4. Voltage dips/interruptions are not monitored during ramping and idle (control OFF) states.
8
Enertech Global
54
Specifications are subject to change without notice (03.09.2014)
IOM, YT Models
SECTION 11: SOFT START CONTROLS
Mode
of Operation
(Voltage(Voltage
Dips)
Mode
of Operation
Interruptions)
Mains operational voltage
230VAC
M
0VAC
ms *
<<300
300ms
Green LED
G
Control Voltage
C
50ms1
20ms*
Controller output
Alarm indication, Red LED
Alarm relay contact
Alarm recovery
C
Flashing
A
On
A
*
Mains operational voltage
230VAC
0VAC
> 600ms
Green LED
Control Voltage
50ms1
20ms*
Controller output
On 2*
On
Recovery indication, orange LED
Alarm relay contact
3
1 For a 50Hz supply, minimum interruption detection is of 50ms (+20ms/ -0ms).
2 Orange LED will be ON if the time between starts and/or time from stop to start has not elapsed.
Following the recovery between starts and/or from stop to start, if control voltage is present, the RSBS shall try to restart the compressor.
IOM, YT Models
Specifications are subject to change without notice (03.09.2014)
55
Enertech Global
7
RSBS2332A2V22C24SM28, RSBS2325A2V22C17SM29
SECTION 11: SOFT START CONTROLS
LED Status Indication
RSBS…SM28/ SM29 specific mode of operation
The RSBS...SM28 shall try to softstart the compressor at 45AACrms current limit. Depending on the load requirement, the current limit will be gradually increased up to a
maximum of 80AACrms after which the RSBS will switch into bypass mode.
The RSBS SM29 shall try to softstart the compressor at 25AACrms current limit. Depending on the load requirement, the current limit will be gradually increased up to a
maximum of 40AACrms after which the RSBS will start to switch into bypass mode.
If ramping is not achieved after a maximum of 1 second, the Incomplete Ramp Alarm (5 flashes on red LED) will be triggered and the RSBS will enter into a recovery
mode for 5 mins. If, at the second consecutive attempt the RSBS raises again the Incomplete Ramp Alarm, then a manual user intervention to reset power on the RSBS
shall be required as this might indicate a real locked rotor condtion.
LED Status Indication
Orange LED
Relay Contact
Condition
Action
Fully ON1
11/12
Red LED
Relay Contact
Condition
Action
2 flashes
11/14
Undervoltage (Ue < 180VAC)****
Auto reset with 5 mins recovery **
3 flashes
11/14
Overcurrent (>80A for 1 sec.)
Auto reset with 5 mins recovery
4 flashes
11/14
Relay protection
Auto reset with 5 mins recovery ***
5 flashes
11/14
Incomplete ramp
Auto reset with 5 mins recovery
N/A
11/12
Supply phase loss
Physical check
N/A
11/12
Idle state
N/A
11/12
Ramping state
N/A
11/12
Bypass mode
Green LED
Relay Contact
Condition
Action
Flashing
11/12
Power supply alarm
Contact Carlo Gavazzi
representative
Fully ON
11/12
Idle state
RSBS waiting for
control signal to start
Min. recovery time between starts and/or Auto reset when minimum recovery
recovery time between stop to start
time elapses.
** Monitored during bypass
*** Refer to note 6 in Mode of operation section
**** Refer to voltage dips and interruptions section for mode of operation
Flashing Sequence
500ms
....
500ms
500ms
1500ms
2000ms
500ms
Recovery
Mode
Note: During recovery from an alarm condition, the red LED will flash at twice the normal flashing frequency between successive flashing cycles as shown above to indicate
that the softstarter is in recovery mode which recovery lasts for 5 minutes
Enertech Global
56
IOM, YT Models
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, W/O DSH 208/230V 60Hz,
Single Phase, Residential
IOM, YT Models
57
Enertech Global
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, DSH, 208/230V, 60Hz,
Single Phase, Residential/Commercial
Enertech Global
58
IOM, YT Models
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, 208/230V,60Hz,
Single Phase, Commercial
IOM, YT Models
59
Enertech Global
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, 208/230V, 60Hz,
Three Phase, Commercial
Enertech Global
60
IOM, YT Models
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, DSH, 208/230V,
60Hz, Three Phase, Commercial
IOM, YT Models
61
Enertech Global
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, 460V, 60Hz,
Three Phase, Commercial
Enertech Global
62
IOM, YT Models
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, DSH, 460V, 60Hz,
Three Phase, Commercial
IOM, YT Models
63
Enertech Global
SECTION 12: WIRING DIAGRAMS
Two Stage, ECM, DSH, 208/230V 60Hz, Single
Phase, Residential/Commercial
Enertech Global
64
IOM, YT Models
SECTION 13: EQUIPMENT START-UP PROCEDURES
Equipment Start-Up Process
Equipment Start-Up Process
Check the following before power is applied to the equipment
Caution: Do not start-up the unit until the new structure is ready to be occupied
Electrical:
•
•
•
•
•
•
•
High voltage wiring and breakers are
properly sized and installed
Auxiliary electric heaters are wired and
installed correctly
Circulator pumps are wired properly and
connected to the proper terminal block
Low voltage wiring is correct and
completely installed
Source voltage is correct and matches
dataplate
HWG pump is not wired or is switched off
until all piping is correct and air is purged
from the system
Lockout board jumpers are properly
selected for installation, i.e., A-FRZ jumper
removed for closed loop
Plumbing:
•
•
•
•
•
Piping is completed, properly sized and
purged of all air and debris, loop, HWG
and load side
Pumps are properly sized and purged of
all air
Correct amount of antifreeze has been
added
All valves are open including flow center
Condensate is trapped and properly
piped to drain
Mechanical:
• Filter is installed and clean
• Packaging and shipping brackets are
removed from the blower assembly
• Blower turns freely
• Canvas connections installed on supply
plenum & return drop
• Replace all service panels and screws
Equipment Start-Up:
1. Energize geothermal unit with high voltage.
2. Make sure secondary/low voltage is between 20V and 29V. Check the transformer’s
primary connections at the main contactor for the correct voltage (Orange & Black = 230V;
Red & Black = 208V). Correct any possible voltage drops in the main voltage.
3. Set the thermostat to “Heat” or “Cool.” Adjust set point to energize the unit. System will
energize after delays expire (typically a five minute delay).
4. Check water flow with a flow meter (non-pressurized) or pressure drop conversion
(pressurized). Pressure drop tables must be used to convert the pressure drop to GPM. The
pressure drop can be obtained by checking water pressure in and water pressure out at the
P/T ports. Check the geothermal unit’s electrical readings listed in the Unit Electrical Data
table.
5. Check the source water temperature in and out at the P/T ports (use insertion probe). Allow
10 minutes of operation before recording temperature drop.
6. Calculate the heat of extraction or heat of rejection.
7. Check the temperature difference of the load coax (water-to-water) or air coil (water-toair). P/T ports are recommended for use on the load side, but the line temperatures can be
used to check the temperature difference.
8. Change the mode of the thermostat and adjust the set point to energize the unit. Check
the data in opposite mode as the previous tests. Amp draws as well as temperature
differences and flow rate should be recorded.
9. Check auxiliary heat operation by adjusting the thermostat set point 5°F above the room
temperature in “Heat” mode or set thermostat to “Emergency." Record voltage, amperage,
and air temperature difference.
10. Connect HWG wires or turn switch (if equipped) to on position.
IOM, YT Models
65
Enertech Global
SECTION 13: EQUIPMENT START-UP PROCEDURES
EQUIPMENT
EquipmentSTART-UP
Start-UpFORM
Form
Customer Name:_________________________________________________________________
Customer Address:_____________________________________________________________________________________
Model #:__________________________________________ Serial #:____________________________________________
Dealer Name:__________________________________________________________________________________________
Distributor Name:_____________________________________________ Start-up Date:____________________________
Loop Type: Open Closed (Circle One)
Flow Rate
Cooling
Heating
Cut along this line
Source Water Pressure In
Source Water Pressure Out
Source Water Pressure Drop
Flow Rate
*Check pressure drop chart for GPM
PSI
PSI
PSI
GPM
Unit Electrical Data
PSI
PSI
PSI
GPM
Line Voltage
Total Unit Amps
Compressor Amps
Wire Size
Circuit Breaker Size
Source Water Temp. Difference
Cooling
Heating
Heat of Rejection/Extraction
Cooling
Heating
Source Water Temperature In
Source Water Temperature Out
Source Water Temperature Difference
Heat of Rejection
Heat Of Extraction
ºF
ºF
ºF
BTU/HR
Cooling
V
A
A
GA
A
Heating
A
A
ºF
ºF
ºF
BTU/HR
Heat of Extraction/Rejection = GPM X Water Temp. Difference X 500 (Water - Open Loop)
Heat of Extraction/Rejection = GPM X Water Temp. Difference X 485 (Water & Antifreeze - Closed Loop)
Load Water Temp. Difference
Load Water Temperature In
Load Water Temperature Out
Load Water Temperature Difference
Air Temperature Difference
Cooling
ºF
ºF
ºF
Cooling
Supply Air Temperature
ºF
ºF
Return Air Temperature
ºF
Air Temp. Difference
*Confirm auxiliary heaters are de-energized for the above readings.
Heating
ºF
ºF
ºF
Heating
Auxiliary Heat Operation Only
Heating
Auxiliary Heat Electrical Data
Heating
Supply Air Temperature
Return Air Temperature
Air Temp. Difference
Line Voltage
Total Amperage (Full kW - All Stages)
Wire Size
Breaker Size
CFM = (Watts X 3.413) ÷ (Air Temp. Difference X 1.08)
Watts = Volts X Auxiliary Heater Amps
ºF
ºF
ºF
ºF
ºF
ºF
V
A
GA
A
Installer/Technician:____________________________________________ Date:________________________
Enertech Global
66
IOM, YT Models
SECTION 13: EQUIPMENT START-UP PROCEDURES
Heat of Extraction/Heat of Rejection Tables
Model
Part Load
YT024
Full Load
Part Load
YT036
Full Load
Part Load
YT048
Full Load
Part Load
YT060
Full Load
Part Load
YT072
Full Load
GPM
2.0
3.0
4.0
3.0
4.5
6.0
3.0
4.5
6.0
4.5
7.0
9.0
4.0
6.0
8.0
6.0
9.0
12.0
5.0
7.5
10.0
7.5
11.5
15.0
6.0
9.0
12.0
9.0
13.5
18.0
CFM
(Heating/Cooling)
750/740
990/1000
1130/1130
1380/1420
1420/1530
1790/1710
1680/1610
1960/1960
1870/1800
2160/2170
30 oF
Heat of Extraction (MBtuh)
50 oF
70 oF
90 oF
9.1
9.7
10.1
13.3
13.9
14.4
13.1
14.0
14.7
21.3
22.7
23.4
19.0
20.3
21.0
28.2
29.7
30.1
22.7
24.1
25.0
33.7
35.9
36.7
26.9
28.8
30.3
37.2
40.2
41.9
12.8
13.5
14.1
17.7
18.6
19.2
19.8
21.0
22.0
29.4
31.2
32.1
26.8
28.5
29.4
38.1
40.0
40.5
31.9
33.6
34.9
45.6
48.5
49.6
36.8
39.3
41.1
51.0
54.9
57.2
17.5
18.4
19.1
23.9
25.0
25.8
26.3
27.8
29.0
37.8
40.1
41.3
35.1
37.1
38.2
48.7
51.2
51.8
42.9
45.1
46.7
59.1
62.8
64.1
50.0
53.2
55.7
65.6
70.6
73.4
22.7
23.9
24.8
29.9
31.3
32.2
33.1
35.0
36.5
46.2
49.0
50.3
44.3
46.8
48.1
60.4
63.4
64.1
53.9
56.6
58.7
72.6
77.0
78.7
61.3
65.1
68.1
79.4
85.3
88.7
50 oF
26.7
26.7
26.7
36.0
35.9
35.8
37.3
37.4
37.6
52.1
52.4
52.6
47.7
47.8
48.2
64.3
64.3
64.7
59.5
60.0
60.3
79.9
80.4
80.5
70.4
72.4
72.8
91.0
91.3
91.4
Heat of Rejection (MBtuh)
70 oF
90 oF
110 oF
25.6
25.5
25.4
34.5
34.4
34.3
36.2
36.1
36.3
50.8
51.0
51.1
46.8
46.7
47.0
62.6
62.6
62.8
57.7
57.9
58.0
79.7
80.0
80.1
68.7
70.3
70.5
90.8
90.9
91.0
24.5
24.2
24.1
33.1
32.8
32.7
34.3
34.1
34.1
48.3
48.4
48.4
44.8
44.5
44.6
59.7
59.5
59.6
55.4
55.3
55.3
75.8
75.9
75.8
66.6
67.6
67.7
87.2
87.0
86.9
23.0
22.5
22.2
31.4
31.0
30.8
32.2
31.8
31.8
45.6
45.5
45.4
43.2
42.5
42.5
57.8
57.3
57.3
53.0
52.5
52.3
71.9
71.6
71.4
63.6
64.0
63.8
83.1
82.6
82.3
1. Capacity data is based on 15% (by mass) methanol antifreeze solution (multiplier: 485).
2. Heating data is based on 70°F EAT. Cooling data is based on 80/67°F EAT. Any condition outside performance table(s) requires correction
factor(s).
3. Performance data accurate within ±15%.
4. Unit performance test is run without hot water generation.
5. Capacity data includes fan power but not pump power and it does not reflect fan or pump power correction for AHRI/ISO conditions.
6. Performance data is based upon the lower voltage of dual voltage rated units.
7. Interpolation of unit performance data is permissible; extrapolation is not.
8. Performance data is a result of lab testing and is not related to warranty.
9. Due to variations in installation, actual unit performance may vary from the tabulated data.
Performance Check
Heat of Extraction(HE)/Rejection(HR)
Record information on the Unit Start-up Form
Equipment should be in full load operation for
a minimum of 10 minutes in either mode – WITH
THE HOT WATER GENERATOR TURNED OFF.
1. Determine flow rate in gallons per minute
• Check entering water temperature
• Check entering water pressure
• Check leaving water pressure
Once this information is recorded,
• Find corresponding entering water
IOM, YT Models
temperature column in the HE/HR Table.
• Find pressure differential in PSI column.
• Then read the GPM column to determine
flow in GPM.
2. Check leaving water temperature of unit.
• FORMULA: GPM x water temp diff. x 485
(antifreeze) or 500 (fresh water) = HE or HR in
BTU/HR
A 10% variance from table is allowed. Always
use the same pressure gauge & temperature
measuring device. Water flow must be in range
of table. If system has too much water flow,
performance problems should be expected.
67
Enertech Global
SECTION 13: EQUIPMENT START-UP PROCEDURES
Pressure Drop Tables
30 oF
PSI
FT HD
Source Brine Pressure Drop
50 oF
70 oF
PSI
FT HD
PSI
FT HD
90 oF
PSI
FT HD
2.0
3.0
4.0
5.0
1.0
1.9
3.0
4.2
2.3
4.4
6.9
9.7
0.9
1.6
2.5
3.5
2.1
3.7
5.8
8.1
0.8
1.4
2.2
3.1
1.8
3.2
5.1
7.2
0.7
1.3
2.0
2.8
1.6
3.0
4.6
6.5
YT024
Full Load
3.0
4.5
6.0
8.0
2.0
3.7
5.6
8.7
4.6
8.5
12.9
20.1
1.7
3.1
4.7
7.3
3.9
7.2
10.8
16.8
1.4
2.6
4.1
6.3
3.2
6.0
9.5
14.5
1.3
2.4
3.6
5.6
3.0
5.5
8.3
12.9
YT036
Part Load
3.0
4.5
6.0
7.0
0.8
1.2
1.8
2.2
1.8
2.8
4.2
5.1
0.7
1.1
1.6
2.0
1.6
2.5
3.7
4.6
0.6
1.0
1.4
1.8
1.4
2.3
3.2
4.2
0.6
0.9
1.3
1.6
1.4
2.1
3.0
3.7
YT036
Full Load
4.5
7.0
9.0
11.0
1.2
2.3
3.3
4.4
2.8
5.3
7.6
10.1
1.1
2.0
2.9
3.9
2.5
4.6
6.7
9.0
1.0
1.8
2.6
3.5
2.3
4.2
6.0
8.1
0.9
1.6
2.3
3.1
2.1
3.7
5.3
7.2
YT048
Part Load
4.0
6.0
8.0
9.0
1.5
1.9
2.5
2.9
3.5
4.4
5.8
6.7
1.4
1.8
2.4
2.8
3.2
4.2
5.5
6.5
1.4
1.8
2.3
2.7
3.2
4.2
5.3
6.2
1.4
1.7
2.3
2.7
3.2
3.9
5.3
6.2
YT048
Full Load
6.0
9.0
12.0
15.0
2.1
3.3
5.0
6.9
4.8
7.6
11.5
15.9
1.9
3.0
4.5
6.2
4.4
6.9
10.4
14.3
1.8
2.7
4.1
5.7
4.2
6.2
9.5
13.1
1.7
2.6
3.9
5.4
3.9
6.0
9.0
12.5
YT060
Part Load
5.0
7.5
10.0
12.0
0.8
1.7
2.4
3.1
1.8
3.9
5.5
7.2
0.7
1.6
2.3
2.9
1.6
3.7
5.3
6.7
0.7
1.6
2.2
2.8
1.6
3.7
5.1
6.5
0.7
1.5
2.1
2.7
1.6
3.5
4.8
6.2
YT060
Full Load
7.5
11.5
15.0
18.0
1.9
2.9
3.9
5.0
4.4
6.7
9.0
11.5
1.8
2.8
3.7
4.7
4.2
6.5
8.5
10.8
1.7
2.7
3.5
4.5
3.9
6.2
8.1
10.4
1.7
2.6
3.4
4.4
3.9
6.0
7.8
10.1
YT072
Part Load
6.0
9.0
12.0
15.0
1.7
2.0
2.7
3.7
3.9
4.6
6.2
8.5
1.7
1.9
2.6
3.6
3.9
4.4
6.0
8.3
1.7
1.9
2.6
3.6
3.9
4.4
6.0
8.3
1.6
1.9
2.5
3.5
3.7
4.4
5.8
8.1
YT072
Full Load
9.0
13.5
18.0
22.0
2.2
3.5
5.7
7.8
5.1
8.1
13.1
18.0
2.0
3.3
5.3
7.3
4.6
7.6
12.2
16.8
2.0
3.2
5.1
7.0
4.6
7.4
11.8
16.1
1.9
3.1
5.0
6.9
4.4
7.2
11.5
15.9
Model
GPM
YT024
Part Load
1. Pressure drop data is based on 15% (by mass) methanol antifreeze solution (multiplier: 485).
2. Pressure drop data accurate within ±25%.
3. Unit performance test is run without hot water generation.
4. Interpolation of unit pressure drop data is permissible; extrapolation is not.
5. Pressure drop data is a result of lab testing and is not related to warranty.
6. Due to variations in installation, actual unit performance may vary from the tabulated data.
Enertech Global
68
IOM, YT Models
SECTION 14: TROUBLESHOOTING
QR Codes for Installation or Troubleshooting Tip Videos
Select the topic for your maintenance
need. Scan the QR code to access the
video. Follow the directions and tips
provided to make your project easier to
complete
Nitrogen Purge While Brazing
Leak Testing an Air Coil
ECM Temporary Replacement
Loop Flushing
ECM Motor Troubleshooting
Repairing a Microchannel Air
Troubleshooting a TXV
Coil
Compressor Troubleshooting
Testing a Coaxial Heat Exchanger
Variable Speed Flow Centers
Troubleshooting a TXV
Return Conversion for and XT
or CT
Installing a YT Vertical Unit
Heat Of Extraction and Rejection
Measuring Subcooling/Superheat
IOM, YT Models
69
Enertech Global
SECTION 14: TROUBLESHOOTING
Operating Parameters
Discharge
PSIG
256-327
262-334
276-351
283-363
311-394
319-411
348-443
357-460
Suction
PSIG
58-75
68-83
88-104
100-115
121-138
134-156
154-180
179-202
Full Load Heating - No Hot Water Generation
Subcooling Superheat
Water Temp Drop
°F
°F
°F
13-33
7-20
6-12
11-29
6-18
3-7
7-29
5-18
9-15
4-26
5-18
4-9
10-29
4-16
13-19
6-26
7-18
6-11
7-25
4-15
16-23
3-23
9-20
8-14
Discharge
GPM/Ton
PSIG
1.5
211-237
3
183-211
1.5
291-319
3
252-280
1.5
381-421
3
331-370
1.5
489-549
3
425-482
Suction
PSIG
114-143
113-142
124-149
122-148
128-153
127-152
132-158
130-157
Full Load Cooling - No Hot Water Generation
Subcooling Superheat
Water Temp Rise
°F
°F
°F
18-28
11-26
18-27
10-19
12-29
8-14
16-30
6-15
18-26
7-21
9-17
8-14
17-32
4-15
17-25
7-22
7-16
8-13
16-33
3-14
16-24
7-23
5-15
7-13
Air Temp Drop
°F - DB
19-25
19-26
18-25
18-25
17-24
17-24
15-22
16-23
Suction
PSIG
62-78
71-85
90-108
103-118
124-143
136-158
162-187
182-206
Part Load Heating - No Hot Water Generation
Subcooling Superheat
Water Temp Drop
°F
°F
°F
13-26
5-18
7-12
11-26
4-17
3-7
10-26
5-16
10-16
4-26
4-15
5-10
12-25
4-15
15-20
6-25
5-17
7-12
9-19
3-14
19-25
3-18
6-17
9-15
Air Temp Rise
°F - DB
13-23
15-25
18-28
20-31
24-36
26-39
30-42
33-46
Suction
PSIG
124-152
122-151
133-157
130-156
136-161
133-160
139-166
137-165
Part Load Cooling - No Hot Water Generation
Subcooling Superheat
Water Temp Rise
°F
°F
°F
15-28
10-24
21-30
6-18
11-25
10-16
15-31
5-19
21-28
4-20
7-19
10-15
16-32
3-20
20-27
6-21
5-21
9-14
17-33
3-20
19-26
6-20
5-21
9-13
Air Temp Drop
°F - DB
17-26
17-26
17-25
17-25
16-24
16-25
15-22
15-23
EWT
Flow
°F
GPM/Ton
1.5
3
1.5
3
1.5
3
1.5
3
30
50
70
90
EWT
°F
50
70
90
110
EWT
°F
30
50
70
90
EWT
°F
50
70
90
110
Flow
Flow
Discharge
GPM/Ton
PSIG
1
253-303
2
258-312
1
270-324
2
276-333
1
302-366
2
309-377
1
335-405
2
344-417
Flow
Discharge
GPM/Ton
PSIG
1
209-238
2
180-208
1
285-320
2
247-277
1
375-421
2
326-361
1
482-543
2
418-465
Air Temp Rise
°F - DB
15-26
16-28
19-33
20-36
25-41
27-44
31-49
34-52
Heating data based on 70°F EAT. Cooling data based on 80/67°F EAT.
CFM is 320-500 CFM/Ton for heating and cooling.
Enertech Global
70
IOM, YT Models
SECTION 14: TROUBLESHOOTING
Compressor Troubleshooting
COMPRESSOR WON’T START
Check for proper
compressor nameplate
voltage.
OK
Does Compressor draw
current when voltage is Yes
applied.
Are the suction &
discharge pressures
balanced.
No
Attempt to restart
the compressor
OK
Check voltage supply
& contactor operation.
OK
No
Check motor
resistance.
(See Note B)
OK
Voltage supply
is too low.
Yes
Allow time for the
protector to reset.
No
Compressor
Connection Block
Is the voltage 197
or higher when the
compressor is trying
to start.
Yes
C
Yes
OK
Recheck Resistance
R
Not
OK
OK
Allow to start the
compressor while
measuring voltage
on the load side of
the contactor.
Allow time for
compressor to
balance.
Not
OK
Is the compressor
hot?
No
Check the wiring,
capacitor & contactor
operation. (See Note A)
Yes
If the compressor
fails to start after
3 attempts, replace
the compressor.
S
Single Phase 208-230
C = Line Winding
R = Run Winding
S = Start Winding
Replace Compressor
A: Check all terminals, wires & connections for loose or burned wires and connections. Check contactor and 24 Volt
coil. Check capacitor connections & check capacitor with capacitor tester.
B: If ohm meter reads 0 (short) resistance from C to S, S to R, R to C or from anyone of one of these terminals to
ground (shorted to ground), compressor is bad.
COMPRESSOR WON’T PUMP CHART
Is th e c o m p re s s o r
ru n n in g ?
Y es
M e a s u re & re c o rd
th e a m p s , v o lts,
s u c ti o n & d is c h a rg e
p re s s u re .
OK
D o e s th e u n it
h a v e a re frig e ra n t
c h a rg e ?
S h u t th e u n it d o w n &
re v e rse th e p h a sin g
(3 - P h a s e O n ly )
OK
No
No
R e fe r to th e c o m p re s s o r
w o n 't sta rt flo w c h a rt.
Y es
C h e c k & v e rify
th e ru n c a p a c ito r
A d d re frig e ra n t
to th e s y ste m .
OK
If th e c o m p re s s o r
s till w o n 't p u m p
re p la c e c o m p re s s o r.
IOM, YT Models
71
OK
C h e c k th e o p e ra tio n
o f th e re v e rs in g
v a lv e .
Enertech Global
SECTION 14: TROUBLESHOOTING
Refrigeration Troubleshooting
Mode
Discharge
Pressure
Suction
Pressure
Superheat
Subcooling
Air TD
Water
TD
Compressor
Amps
Heat
Low
Low
High
Low
Low
Low
Low
Cool
Low
Low
High
Low
Low
Low
Low
Heat
High
High/Normal
Normal
High
High
Normal
High
Cool
High
High/Normal
Normal
High
Normal
High
High
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Low Source
Water Flow
Heat
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Cool
High
High/Normal
Normal
High/Normal
High
Low
High
Low Load
Water Flow
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Heat
High
Low
High
High
Low
Low
Low
Cool
High
Low
High
High
Low
Low
Low
Heat
Low
High/Normal
Low
Low
Low
Low
High
Cool
Low
High/Normal
Low
Low
Low
Low
High
Heat
Low
High
High/Normal
Low/Normal
Low
Low
Low
Cool
Low
High
High/Normal
Low/Normal
Low
Low
Low
Condition
Under Charge
Over Charge
Low Air Flow
Restricted TXV
TXV Stuck Open
Inadequate
Compression
Superheat/Subcooling Conditions
Superheat Subcooling
Condition
Normal
Normal
Normal operation
Normal
High
Overcharged
High
Low
Undercharged
High
High
Restriction or TXV is stuck almost closed
Low
Low
TXV is stuck open
Enertech Global
72
IOM, YT Models
SECTION 14: TROUBLESHOOTING
Troubleshooting Worksheet
Customer/Job Name:____________________________________________ Date:________________________________
Model #:__________________________________________ Serial #:____________________________________________
Antifreeze Type:____________________________________
HE or HR = GPM x TD x Fluid Factor
(Use 500 for water; 485 for antifreeze)
SH = Suction Temp. - Suction Sat.
SC = Disch. Sat. - Liq. Line Temp.
°F
Liquid line (heating)
To suction line bulb
°F
Liquid line (cooling)
To suction line
Filter Drier
Air Coil
TXV
psi
°F
Suction Line (saturation)
°F
Suction temp
Reversing
Valve
psi
°F
Discharge Line (saturation)
°F
Coax
Suction
Coax
Suction
Air Coil
Heating
Mode
Air Coil
°F
Supply Air
°F
Return Air
psi
Optional desuperheater
installed in discharge line
(always disconnect during
troubleshooting)
Source (loop) IN
Cooling
Mode
GPM
Discharge
Source
Coax
Discharge
°F
psi
Source (loop) OUT
IOM, YT Models
73
Enertech Global
SECTION 14: TROUBLESHOOTING
Troubleshooting Tips
A: UNIT WILL NOT START IN EITHER CYCLE
Thermostat
Set thermostat on heating and highest temperature setting. Unit should run. Set thermostat on cooling and
lowest temperature setting. Unit should run. Set fan to On position. Fan should run. If unit does not run in
any position, disconnect wires at heat pump terminal block and jump R, G, Y. Unit should run in heating. If
unit runs, replace thermostat with correct thermostat only.
Loose or Broken Wires
Tighten or replace wires.
Blown Fuse/
Check fuse size, replace fuse or reset circuit breaker.
Check low voltage circuit breaker.
Tripped Circuit Breakers
Check fuse size, replace fuse or reset circuit breaker.
Low Voltage Circuit
Check 24 volt transformer. If burned out or less than 24 volt, replace. Before replacing, verify tap setting
and correct if necessary.
B: BLOWER RUNS BUT COMPRESSOR WILL NOT START (COMPRESSOR OVERLOAD, BAD CAPACITOR, HP FAULT)
Logic Board
Check if status light is on and logic board is working properly. Check fault lights. See LED Identification
chart in Controls Section
Defective Sensors
Check status/fault lights. Sensor is out of normal range for resistance values, open, or shorted. Compare
sensor resistance values with the charted resistance in Controls Section
Defective Capacitor
Check capacitor. If defective, replace.
Failed Compressor
See charts M and N for compressor diagnostic. If compressor still doesn’t run, replace it.
Low Pressure Switch
Low refrigerant charge. Check for pressure. Check for leaks.
C: BLOWER RUNS BUT COMPRESSOR SHORT CYCLES OR DOES NOT RUN
Wiring
Loose or broken wires. Tighten or replace wires. See A: Unit will not start in either cycle.
Blown Fuse
Check fuse size. Check unit nameplate for correct sizing. Replace fuse or reset circuit breaker.
Check low voltage circuit
breaker.
Temporarily bypass flow switch for a couple seconds. If compressor runs properly, check switch. If
defective, replace. If switch is not defective, check for air in loop system. Make sure loop system is
properly purged. Verify flow rate before changing switch. .
Defective Sensors
Check status/fault lights. Sensor is out of normal range for resistance values, open, or shorted. Compare
sensor resistance values with the charted resistance in Controls Section
Water Flow (Source Heat
Exchanger Freeze Fault)
Check status/fault lights. To check water flow remove the FS jumper (see Controls Section for location)
and jumper the two FS terminals (located between blue and violet wires on the right side of the
board) together to complete the flow switch circuit. Determine if the required water pressure drop is
present. If required pressure drop is present, check the resistance of T4 source sensor (15°F=41.39kΩ;
30°F=28.61kΩ) and temperature of the refrigerant line between the source heat exchanger and TXV.
High or Low
Pressure Switches
If heat pump is out on high or low-pressure cutout (lockout), check for faulty switches by jumping the high
and low-pressure switches individually. If defective replace. Check airflow, filters, water flow, refrigerant
pressures, and ambient temperature. WARNING: Only allow compressor to run for a couple of seconds
with the high pressure switch jumped.
Defective Logic Board Relay
Jump R to Y directly on lockout board. Check for 24V at Y. If no operation and no faults occur, replace
lockout board.
Hot Gas Temperature>220°F
Check status/fault lights. Check hot gas/discharge line temperature with a thermocouple type
thermometer. WARNING: Let the unit remain off for several minutes and touch the thermocouple to the
discharge line to check if it is cooled enough to strap/tape a thermocouple to it. Check the discharge line
temperature during the next operation cycle to compare the temperature to the lockout temperature of
220°F. Check water/air flow. If water/air flow is present, check the refrigerant pressures.
Condensate Overflow (CO)
Check status/fault lights. Check sensors for contact with water, debris, or a loose sensor touching metal.
Clean sensors if contacting debris. Flush drain lines if the drain pan is full. If no debris is present and drain
pan is empty, remove violet wire from CO terminal on lockout board (lower right). If CO lockout occurs
with violet wire removed replace the lockout board.
Over/Under Voltage
Make sure secondary/low voltage is between 20V and 29V. Check the transformer’s primary connections
for the correct voltage (Orange & Black = 230V; Red & Black = 208V). Correct any possible voltage drops
in the main voltage.
Load Heat Exchanger Frozen
Check status/fault lights. Check for reduced air flow due to dirty filter, obstructions, or poor blower
performance. Check T1 sensor for the proper resistance (30°F = 28.61kΩ).
D: UNIT RUNNING NORMAL, BUT SPACE TEMPERATURE IS UNSTABLE
Thermostat
Enertech Global
Thermostat is getting a draft of cold or warm air. Make sure that the wall or hole used to run thermostat
wire from the ceiling or basement is sealed, so no draft can come to the thermostat.
Faulty Thermostat (Replace).
74
IOM, YT Models
SECTION 14: TROUBLESHOOTING
TROUBLESHOOTING TIPS
E: NOISY BLOWER AND LOW AIR FLOW
Noisy Blower
Blower wheel contacting housing—Readjust, Foreign material inside housing—Clean housing.
Loose duct work—Secure properly.
Low air flow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air filter—Clean or replace; obstruction in system—Visually check.
Balancing dampers closed, registers closed, leaks in ductwork. Repair.
Ductwork too small. Resize ductwork.
F: NO WATER FLOW
Pump Module
Make sure Pump Module is connected to the control box relay (check all electrical connections). For nonpressurized systems, check water level in Pump Module. If full of water, check pump. Close valve on the
pump flanges and loosen pump. Take off pump and see if there is an obstruction in the pump. If pump is
defective, replace. For pressurized systems, check loop pressure. Repressurize if necessary. May require
re-flushing if there is air in the loop.
Solenoid valve
Make sure solenoid valve is connected. Check solenoid. If defective, replace.
G: IN HEATING OR COOLING MODE, UNIT OUTPUT IS LOW
Water
Water flow & temperature insufficient.
Airflow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air filter—Clean or replace.
Restricted or leaky ductwork. Repair.
Refrigerant charge
Refrigerant charge low, causing inefficient operation. Make adjustments only after airflow and water flow
are checked.
Reversing valve
Defective reversing valve can create bypass of refrigerant to suction side of compressor. Switch reversing
valve to heating and cooling mode rapidly. If problem is not resolved, replace valve. Wrap the valve with a
wet cloth and direct the heat away from the valve. Excessive heat can damage the valve. Always use dry
nitrogen when brazing. Replace filter/drier any time the circuit is opened.
Heat pump will not cool but will
heat. Heat pump will not heat
but will cool.
Reversing valve does not shift. Check reversing valve wiring. If wired wrong, correct wiring. If reversing
valve is stuck, replace valve. Wrap the valve with a wet cloth and direct the heat away from the valve.
Excessive heat can damage the valve. Always use dry nitrogen when brazing. Replace filter/drier any time
the circuit is opened.
Water heat exchanger
Check for high-pressure drop, or low temperature drop across the coil. It could be scaled. If scaled, clean
with condenser coil cleaner.
System undersized
Recalculate conditioning load.
H: WATER HEAT EXCHANGER FREEZES IN HEATING MODE
Water flow
Low water flow. Increase flow. See F. No water flow.
Flow Switch
Check switch. If defective, replace.
I: EXCESSIVE HEAD PRESSURE IN COOLING MODE
Inadequate water flow
Low water flow, increase flow.
J: EXCESSIVE HEAD PRESSURE IN HEATING MODE
Low air flow
See E: Noisy blower and low air flow.
K: AIR COIL FREEZES OVER IN COOLING MODE
Air flow
See E: Noisy blower and low air flow.
Blower motor
Motor not running or running too slow. Motor tripping off on overload. Check for overheated blower motor
and tripped overload. Replace motor if defective.
Panels
Panels not in place.
Low air flow
See E: Noisy blower and low air flow.
L: WATER DRIPPING FROM UNIT
Unit not level
Level unit.
Condensation drain line plugged
Unplug condensation line.
Water sucking off the air coil in
cooling mode
Too much airflow. Duct work not completely installed. If duct work is not completely installed, finish duct work. Check
static pressure and compare with air flow chart in spec manual under specific models section. If ductwork is completely
installed it may be necessary to reduce CFM.
Water sucking out of the
drain pan
Install an EZ-Trap or P-Trap on the drain outlet so blower cannot suck air back through the drain outlet.
IOM, YT Models
75
Enertech Global
SECTION 14: TROUBLESHOOTING
Unit Electrical Data
Note: Proper Power Supply Evaluation
⚠ CAUTION ⚠
When any compressor bearing unit is connected
to a weak power supply,
A starting current will
generate a significant “sag” in the voltage
which reduces the starting torque of the
compressor motor and increases the start time.
This will influence the rest of the electrical system
in the building by lowering
EP the voltage to theEL
lights. This momentary low voltage causes “light
dimming”. The total electrical system should
be evaluated with an electrician
and HVAC
NEUTRAL
OR
technician. The evaluation should
include
GROUND
all connections, sizes of wires, and size of the
E
EL
distributionP panel between the unit and the
utility’s connection. The transformer
connection
EP
and sizing should be evaluated by the electric
B
C provider.
utility
CHECK COMPRESSOR AMP DRAW TO VERIFY
COMPRESSOR ROTATION ON THREE PHASE
UNITS. COMPARE AGAINST UNIT ELECTRICAL
TABLES. REVERSE ROTATION RESULTS IN
HIGHER SOUND LEVELS, LOWER AMP DRAW,
AND INCREASED COMPRESSOR WEAR. THE
COMPRESSOR INTERNAL OVERLOAD WILL TRIP
AFTER A SHORT PERIOD OF OPERATION.
Example 1: WYE (STAR) Electrical Circuit
A
Example 2: DELTA Electrical Circuit
EL
IP
EP
EL
NEUTRAL OR
GROUND
EL
EP
EL
EP
C
B
EP
EP
EL
EL
IP
EP
⚠ CAUTION ⚠
EL
E
L
ALL VOLTAGE CODE “3” 460V UNITS UTILIZE
A 277V ECM MOTOR WHICH REQUIRES A
EP
EP WIRE. THE MOTORS
NEUTRAL
ARE WIRED
BETWEEN THE NEUTRAL AND ONE HOT LEG
OF THE CIRCUIT. SOURCE WIRING MUST BE
WYE (STAR) CONFIGURATION. 3-PHASE EL
DELTA CONNECTIONS WILL NOT PROVIDE THE
CORRECT WIRING AND WILL CAUSE THE UNIT
NOT
E TO OPERATE.
P
Enertech Global
EL
76
IOM, YT Models
SECTION 15: WARRANTY FORMS
Claim Form
WARRANTY ORDER & CLAIM
PHONE : 618.664.9010 FAX : 618.664.4597 EMAIL : WARRANTY@ENERTECHGEO.COM
ALL WARRANTY REGISTRATIONS SHOULD BE SUBMITTED WITHIN 10 DAYS OF INSTALLATION
(Form submitter) DATE ___________________
COMPANY NAME ____________________________________________________
PHONE _________________ FAX _________________ EMAIL ________________________________________
ORDERED BY _____________________________________ JOB NAME/PO # ____________________________
UNIT Model # _____________________________________ Serial # ____________________________________
FAILURE DATE ____________________
SHIP TO
HOMEOWNER
ADDRESS
(If different
than
company)
Required if claim is for defective flow center
FLOW CENTER MODEL # ________________________ FLOW CENTER SERIAL # __________________________
FAILURE CODES, DESCRIPTION AND LABOR REIMBURSEMENT
MUST BE FOUND IN WARRANTY MANUAL
FAILURE CODE
DESCRIPTION
PART NUMBER
____________
_________________________________________________
__________
____________
_________________________________________________
__________
____________
_________________________________________________
__________
LABOR REIMBURSEMENT REQUESTED
DO YOU NEED PARTS ORDERED?
NO
(If no, and replacement was purchased from another vendor, attach copy of bill
if reimbursement is needed3.)
YES
NO
YES
____________
____________
OTHER NOTES _______________________________________________________________________________
____________________________________________________________________________________________
FOR ENERTECH COMPANIES USE ONLY
SRO# _________________________________________ CREDIT MEMO# ________________________________
1) See warranty coverage summary sheet for labor allowances, conditions and exclusions, etc. 2) Warranty start date is ship date from Enertech
facility unless proof of startup is presented. 3) Outsourced warranty replacement parts will be reimbursed in the form of credit for the part only.
Credit will be no more than the standard equivalent part cost through Enertech. 4) Factory pre-approval is required for anything outside the scope
of this document. 5) Fuses, hose kits and items not mentioned on Warranty Coverage Summary are not covered under this program.
IOM, YT Models
77
Enertech Global
SECTION 15: WARRANTY FORMS
Registration Form
Enertech Global
78
IOM, YT Models
This Page Intentionally Left Blank
IOM, YT Models
79
Enertech Global
Greenville, IL - Mitchell, SD
info@enertechgeo.com
MEMBER
Rev Tab
Enertech Global is continually working to improve its products. As a result, the price, design and specifications of each product
may change without notice and may not be as described herein. For the most up-to-date information, please visit our website,
or contact our Customer Service department at info@enertechgeo.com. Statements and other information contained herein are
not express warranties and do not form the basis of any bargain between the parties, but are merely Enertech Global’s opinion
or commendation of its products.
20D218-01NN
Enertech Global, LLC
170223B
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