2100-583

2100-583
INSTALLATION
INSTRUCTIONS
Water-to-Water Geothermal
Heat Pump
Models:
GW024 GW036GW048
GW060 GW070
MIS-3159
Earth Loop Fluid Temperatures 25° - 110°F
Ground Water Fluid Temperatures 45° - 75°
NOTE: MODELS COVERED BY THIS INSTALLATION MANUAL ARE
NOT FOR USE AS A POOL HEATER OR IN MARINE APPLICATIONS
BMC, Inc.
Bryan, Ohio 43506
Manual:2100-583A
Supersedes:2100-583
File:
Volume 1, Tab 8
Date:07-11-13
Manual2100-583A
Page
1 of 48
CONTENTS
Getting Other Informations and Publications.......... 3
General Information
Water Source Nomenclature...................................... 4
Application and Location
General .................................................................. 7
Shipping Damage...................................................... 7
Application................................................................. 7
Location .................................................................. 7
Unit Stacking.............................................................. 7
Additional Consideration............................................ 7
ANSI Z535.5 Definitions............................................. 8
Power & Control Wiring
High Voltage Line Supply........................................... 9
Low Voltage Control Wires......................................... 9
Control Wiring.......................................................... 11
Relocatable Control Panel....................................... 10
Wiring - Low Voltage
Dual Primary & Low Voltage Connections............. 12
Piping Access to Unit
Loop, Load & Desuperheater Connections.............. 13
Load Side Water Connections
Sizing Buffer Tanks for Zoned Systems................... 14
Ground Loop (Earth Coupled Water Loop App.)
Circulation System Design....................................... 16
Ground Water (Well System App.)
Water Connections.................................................. 18
Well Pump Sizing.............................................18 & 19
System Start Up Procedure for Ground Water App.....20
Water Corrosion....................................................... 20
Remedies of Water Problems.................................. 21
Lake & Pond Installations........................................ 22
Figures
Figure 1 Unit Dimensions........................................ 6
Figure 2 Wire Routing to Control Panel................... 9
Figure 3 Changing Water Entrance Location........ 10
Figure 4 Control Wiring (Control Panel & Conduits)... 11
Figure 5 Typical Load Side Hydronic System........ 15
Figure 6 Circulator System Design........................ 16
Figure 7A Circulation System Design...................... 17
Figure 7B Model DORFC-1 Flow Center................. 17
Figure 7C Model DORFC-2 Flow Center................. 17
Figure 8 Water Connection Components.............. 19
Figure 9 Water Coil Cleaning................................ 21
Figure 10 Desuperheater Wiring Diagram............... 25
Figure 11 One-Tank Desuperheater System........... 26
Figure 12 Two-Tank Desuperheater System........... 27
Figure 13 Inlet & Outlet Thermistor Temp Curves... 28
Figure 14 System Component Locations................ 32
Figure 15 Electrical Control Locations..................... 32
Figure 16 Cooling Cycle Diagram........................... 33
Figure 17 Heating Cycle Diagram........................... 34
Figures 18-22 Pressure Tables............................35-44
Manual2100-583A
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Desuperheater (Potable Hot Water Assist)
Description............................................................... 23
Location ................................................................ 23
Electrical Connection............................................... 23
Installation Procedure - General.............................. 23
Operation of Heat Recovery Unit............................. 24
Start Up & Check Out.............................................. 24
Maintenance............................................................ 24
Control Board Sequence of Operation..................... 28
Sequence of Operation
Part Load Cooling.................................................... 29
Full Load Cooling..................................................... 29
Part Load Heating.................................................... 29
Full Load Heating..................................................... 29
Geothermal Logic Control........................................ 29
High & Low Pressure Switch.................................... 30
Flow Switch.............................................................. 30
Over/Under Voltage Protection................................ 30
Intelligent Reset....................................................... 30
Alarm Output............................................................ 30
Pressure Service Ports............................................ 30
Checking Refrigerant Quantity................................. 30
Refrigerant Charge
General ................................................................ 31
R-410A & Topping Off System Charge.................... 31
Safety Practices....................................................... 31
Troubleshooting
Table
................................................................ 45
Service
Hints, Unbrazing System Components & Compressor
Solenoid ................................................................ 46
Ground Source HP Perf. Report
& Checklist - Perform. Unit............................. 47 & 48
Tables
Table 1
Table 2
Table 3
Table 4
Table
Rated Flow Rates for Various Fluids......... 4
Electrical Specifications............................ 5
Source Side Water Coil Pressure Drops.... 5
Operating Voltage Range........................ 12
Low Voltage Connections for DDC Controls.. 12
GETTING OTHER INFORMATION AND PUBLICATIONS
These publications can help you install the air
conditioner or heat pump. You can usually find these
at your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.
National Electrical Code........................ANSI/NFPA 70
Standard for the Installation................ ANSI/NFPA 90A
of Air Conditioning and Ventilating Systems
Standard for Warm Air........................ ANSI/NFPA 90B
Heating and Air Conditioning Systems
Load Calculation for Residential ....... ACCA Manual J
Winter and Summer Air Conditioning
Duct Design for Residential...............ACCA Manual D
Winter and Summer Air Conditioning and Equipment
Selection
Closed-Loop/Ground Source Heat Pump.........IGSHPA
Systems Installation Guide
Grouting Procedures for Ground-Source..........IGSHPA
Heat Pump Systems
Soil and Rock Classification for.......................IGSHPA
the Design of Ground-Coupled Heat Pump Systems
Ground Source Installation Standards..............IGSHPA
Closed-Loop Geothermal Systems...................IGSHPA
– Slinky Installation Guide
Radiant Systems Design..........................................RPA
...........................................................................IAMPO
..............................................................................ASSE
FOR MORE INFORMATION, CONTACT
THESE PUBLISHERS:
ACCA
Air Conditioning Contractors of America
1712 New Hampshire Avenue
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI
American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
ASHRAE American Society of Heating Refrigerating, and Air Conditioning Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400
Fax: (404) 321-5478
NFPA
National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: (800) 344-3555
Fax: (617) 984-7057
IGSHPA
International Ground Source
Heat Pump Association
490 Cordell South
Stillwater, OK 74078-8018
Radiant Professionals Association
www.radiantprofessionalsalliance.org
IAPMO
www.iampo.org
American Society of Sanitary Engineering
www.asse-plumbing.org
World of Plumbing Council
www.worldplumbing.org
EPA WaterSense Partner
www.epa.gov/watersense
American Society of Mechanical Engineers
www.asme.org
NSF International
www.nsf.org
United Association (Union of Plumbers, Fitters,
Welders & HVAC Service Techs.
www.ua.org
Manual2100-583A
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3 of 48
GEO WATER-TO-WATER HEAT PUMP MODEL NUMBER NOMENCLATURE
G
W
048
1
S
—
1
A
X
R
C
C
X
Options
X = None
Geothermal
Water-to-Water
Load Coax
C = Copper
Capacity MBTUH
024
036
048
060
No. of Compressors
070
Source Coax
C = Copper (closed loop)
N = Cupronickel (open loop)
Compressor Type
S = Step Capacity
Revision Level
Reversible Option
H = Heating Only (Phase 2 Release)
R = Reversible (Phase 1 Release)
Voltage
A = 230/208-60-1
Hot Water Generator Option
X = No HWG
1 = HWG & Pump
Loop circulating pumps – Source & Load are field-installed external of the GSH unit for ease of installation, maintenance and service.
TABLE 1
RATED FLOW RATES FOR VARIOUS FLUIDS
APPLICATION
SOURCE
MODEL
GW024
GW036
GW048
GW060
GW070
Ground Loop (15% Methanol, Propylene, Glycol, etc.
Loop
Load
7
7
9
9
11
11
13
13
15
16
Ground Water
Loop
Load
7
7
9
9
11
11
13
13
15
16
Manual2100-583A
Page 4 of 48
TABLE 2
ELECTRICAL SPECIFICATIONS
MODEL
GW024
GW036
GW048
Electrical Ratings (Volts/Hz/Phase)
208/230-60-1
Operating Voltage Range
253-197 VAC
Minimum Circuit Ampacity
GW060
GW070
16.9
21.4
28.8
36.1
39.4
+Field Wire Size
10
8
6
6
6
Ground Wire Size
12
12
10
10
10
++Delay Fuse of Circuit Breaker Max.
25
35
50
60
60
COMPRESSOR
Volts
208/230-60-1
Rated Load Amps (230/208)
8.2 / 9.2
12.2 / 14.0
17.6 / 20.3
21.8 / 24.1
29 / 32
Branch Circuit Selection Current
11.7
15.3
21.2
27.1
29.7
Locked Rotor Amps (230/208)
58.3
83.0
104.0
152.9
179.2
Flow Center (Based upon DORFC-2)
Volts
208/230-60-1
Amps
2.14
Desuperheat Pump Motor
Volts
208/230-60-1
Amps
0.15
+75°C copper wire
++ HACR type circuit breaker
TABLE 3
SOURCE SIDE WATER COIL PRESSURE DROPS
(Based upon 15% Methanol in Heating Mode @ 50°F)
Model
GW024
GW036
GPM
PSID
Ft. Hd.
PSID
Ft. Hd.
4
.93
2.15
5
1.55
3.58
1.57
3.62
6
2.17
5.01
2.19
7
2.79
6.44
8
3.48
8.03
9
4.17
GW048
PSID
Ft. Hd.
Ft. Hd.
6.45
1.76
4.06
3.38
7.80
2.20
5.08
11.95
4.12
9.49
2.64
6.09
2.6
6.07
13.96
4.85
11.19
3.08
7.11
3.1
7.17
12
5.70
13.15
3.58
8.25
3.6
8.28
13
6.55
15.11
4.07
9.39
4.1
9.39
14
4.63
10.67
4.6
10.58
15
5.18
11.95
5.1
11.77
16
5.74
13.23
5.7
13.12
17
6.3
14.46
18
6.9
15.81
11
Ft. Hd.
5.05
1.63
3.75
2.81
6.48
2.21
5.10
3.56
8.21
2.80
9.62
4.31
9.94
0
5.18
6.05
GW070
PSID
10
PSID
GW060
Manual2100-583A
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Manual2100-583A
Page 6 of 48
A
B
2 13/16"
14 5/8"
11 5/8"
LOAD OUTLET
5 5/8"
C
FRONT
LOAD INLET
SOURCE INLET
DSH OUTLET
DSH INLET
33 3/8"
TOP
D
F
2 13/16"
28.296
E
26 5/16"
SOURCE OUTLET
19.044
20.763
1.357
5 1/8"
21 3/8"
3"
24 1/16" 2 5/8"
SIDE
LOW VOLTAGE
ENTRANCES
HIGH VOLTAGE
ENTRANCES
5"
5 1/8"
5 1/4"
2 3/4"
2 3/4"
24 1/8"
5 1/2" 19 7/16" 3 1/2"
21 3/8"
5 3/8"
F
5 1/2" 19 7/16" 3 9/16"
E
GW070
3 1/2"
5 3/8"
D
GW060
19 1/2"
GW036
3 1/2"
C
5 5/16" 5 7/16" 20 5/16" 3 11/16"
19 1/2"
GW024
B
GW048 20 5/16" 3 1/2"
A
UNIT
FIGURE 1 – UNIT DIMENSIONS
MIS-3160
19.044
20.763
1.357
APPLICATION AND LOCATION
NOTE: MODELS COVERED BY THIS INSTALLATION MANUAL ARE NOT FOR USE AS A
POOL HEATER OR IN MARINE APPLICATIONS
GENERAL
LOCATION
Each unit is shipped internally wired, requiring both groundsource and load-side water piping, aquastat wiring, 230/208
volt AC power wiring, and optional desuperheater piping.
The equipment covered in this manual is to be installed by
trained, experienced service and installation technicians.
The unit may be installed in a basement, closet, or utility
room provided adequate service access is ensured, and
equipment will not freeze.
These instructions and any instructions packaged with any
separate equipment required to make up the entire heat
pump system should be carefully read before beginning
the installation. Note particularly any tags and/or labels
attached to the equipment.
While these instructions are intended as a general
recommended guide, they do not in any way supercede any
national and/or local codes. Authorities having jurisdiction
should be consulted before the installation is made.
SHIPPING DAMAGE
Upon receipt of the equipment, the carton should be checked
for external signs of shipping damage. If damage is found,
the receiving party must contact the last carrier immediately,
preferably in writing, requesting inspection by the carrier’s
agent.
APPLICATION
Capacity of the unit for a proposed installation should be
based on heat loss calculations made in accordance with
methods of the Air Conditioning Contractors of America.
The piping systems should be installed in accordance all
local, state, and federal requirements, and to the references
included on Page 3 of this document.
These units are not approved for outdoor installation
and therefore must be installed inside structure being
conditioned. Do not locate in areas subject to freezing in
the winter, or subject to sweating in the summer.
Prior to setting the unit, consider ease of piping and electrical
connections for the unit. Also for units which will be used
with a desuperheater, consider the proximity of the unit to
the water heater or storage tank. Place the unit on a solid
base, preferably concrete, to minimize undesirable noise and
vibration. DO NOT elevate the base pan on rubber or cork
vibration eliminator pads as this will permit the unit base to
act like a drum, transmitting objectionable noise.
UNIT STACKING
The GW-Series products are designed to allow them to
be stacked up to three units high to lower the amount of
installed square footage requirements. Included with unit
are tie plates to secure the units together once they are
stacked. Remove, then replace the bottom three (3) screws
from bottom sides of the upper unit, and the top of the lower
unit to apply the tie plate.
ADDITIONAL CONSIDERATION
As an additional measure of safety in regard to the structure,
consider installing a drain pan with an alarm switch
underneath this water-bearing equipment.
Manual2100-583A
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7 of 48
ANSI Z535.5 Definitions:
• DANGER (color RED): Indicate[s] a hazardous situation
which, if not avoided, will result in death or serious injury.
The signal word “DANGER” is to be limited to the most
extreme situations. DANGER [signs] should not be used
for property damage hazards unless personal injury risk
appropriate to these levels is also involved.
BEFORE DRILLING OR DRIVING ANY SCREWS INTO
CABINET, CHECK TO ENSURE SCREW WILL NOT HIT
ANY INTERNAL PARTS, REFRIGERANT LINES, WATER
LINES, OR ELECTRICAL WIRES/COMPONENTS.
• WARNING (color ORANGE): Indicate[s] a hazardous
situation which, if not avoided, could result in death or
serious injury. WARNING [signs] should not be used
for property damage hazards unless personal injury risk
appropriate to this level is also involved.
• CAUTION (color YELLOW): Indicate[s] a hazardous
situation which, if not avoided, could result in minor or
moderate injury. CAUTION [signs] without a safety alert
symbol may be used to alert against unsafe practices that
can result in property damage only.
• NOTICE (color BLUE): [this header is] preferred to
address practices not related to personal injury. The safety
alert symbol shall not be used with this signal word. As an
alternative to “NOTICE” the word “CAUTION” without the
safety alert symbol may be used to indicate a message not
related to personal injury.
Manual2100-583A
Page 8 of 48
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.
ALL GEOTHERMAL EQUIPMENT 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. EQUIPMENT IS NOT
CERTIFIED FOR OUTDOOR APPLICATIONS. SUCH
INSTALLATION WILL VOID ALL WARRANTIES.
POWER & CONTROL WIRING
HIGH VOLTAGE LINE SUPPLY
LOW VOLTAGE CONTROL WIRES
Supplied with the unit is an adequate length of ¾" liquid-tite
conduit and fittings to run internally within the sheet metal
chassis from the control panel to one of four (4) 1⅛" holes
in the chassis sides (front/rear corners) for line voltage wires
to be ran through. See Figures 2 & 4.
Supplied with the unit is an adequate length of ½" plastic
conduit and fittings to run internally within the sheet metal
chassis from the low voltage box to one of four (4) ⅞" holes
in the chassis sides (front/rear corners) for thermostat wires
to be ran through. See Figures 2 & 4.
FIGURE 2
WIRE
ROUTING
CONTROLPANEL
PANEL
WIRE ROUTING TO CONTROL
1/2" PLASTIC CONDUIT
CONNECTION TO LOW VOLTAGE
TERMINAL STRIP
3/4" CONDUIT CONNECTION TO
INTERNAL CONTROL PANEL FOR
LINE POWER, AND FLOW CENTER
ENTRANCE POINTS FOR 3/4"
LIQUID-TITE CONDUIT FOR
POWER ENTRANCE & FLOW
CENTER POWER
ENTRANCE POINTS FOR 1/2"
PLASTIC CONDUIT FOR
CONTROL WIRING TO AQUA-STAT
MIS-3161
Manual2100-583A
Page
9 of 48
RELOCATABLE CONTROL PANEL
The control panel of the GW-Series products can be
relocated to best suit the installation. It is factory shipped
where the control panel is located on the same side of the
unit the water connections are located. NOTE: the control
panel can be moved to the rear of the unit opposite to
where the water connections are located. See Figure 3.
1. Remove both front and rear service panels.
3. Remove four (4) screws securing control panel to
unit base.
4. Lift and turn control panel sideways guiding it
along the right side of the compressor toward the
rear of the unit.
5. Re-secure to unit base at new location.
2. Remove control panel cover.
FIGURE 3
CHANGING WATER ENTRANCE LOCATION (FRONT TO REAR)
BY RELOCATING CONTROL PANEL
CONTROL PANEL LOCATIONS
FRONT - AS SHIPPED LOCATION
OPTIONAL REAR LOCATION
MIS-3163
Manual2100-583A
Page 10 of 48
POWER & CONTROL WIRING
FIGURE 4
WIRE ENTRANCE CONDUITS
CONTROL PANEL
CONDUITS
MIS-3162
The GW-Series Geothermal Water-to-Water Heat Pumps
contain 2-stage compressors. This will need to be thought
through in planning and ordering the Aquastat control.
The two-stage compressor will not necessarily affect
the net water temperature, but can give great benefit of
reducing the required number of compressor cycles,
especially under lower-load conditions.
In selecting the Aquastat, and depending upon the
particular installation, there are different ways to utilize
this.
1. Select an Aquastat with an outdoor temperature
sensor, and program the Aquastat to only energize
the “Y2” signal when outdoor temperatures fall
below a certain level.
2. Program a length of time to offset Stage #2 being
energized following Stage #1 call. This will
increase system run time/thermal consistency, and
minimize the start/stop cycles on the compressor,
and minimize short cycling.
3. Program the Aquastat to only energize “Y2” when
temperature of water cannot be held or increased
with only “Y1” energized (only bring on “Y2” with
further temperature fall).
4. A jumper can be installed from “Y1” to “Y2”
changing the system to a single stage system.
However, this is not recommended for longevity of
equipment service life or energy efficiency.
Manual2100-583A
Page
11 of 48
WIRING – LOW VOLTAGE WIRING
UNIT MAIN POWER WIRING
This equipment requires a nominal 208/230-60-1 power
supply for proper operation. Line voltage connections are
made at the compressor contactor as noted by the wiring
diagram. Unit main power will route into the control
panel to the contactor through the supplied 3/4" Liquid
Tite conduit from one of the four (4) selectable electrical
entrance points.
230/208, 1-PHASE & 3-PHASE
EQUIPMENT DUAL PRIMARY VOLTAGE
TRANSFORMERS
All Equipment leaves the factory wired on 240 Volt
transformer tap. For 208 Volt operation, reconnect from
240 Volt to 208 Volt tap. The acceptable operating voltage
range for the 240V and 208V transformer taps are as noted
in Table 4.
TABLE 4
OPERATING VOLTAGE RANGE
TAP
RANGE
240V
253 - 216
208V
220 - 187
NOTE: The voltage should be measured at the field power
connection point in the unit, and while the unit is operating at full
load (maximum amperage operating conditions).
Manual2100-583A
Page 12 of 48
For low voltage connections between the Aquastat and
the geothermal heat pump, a low voltage terminal strip is
factory mounted in the heat pump.
LOW VOLTAGE CONNECTIONS
These units use a grounded 24V AC low voltage circuit.
“R” terminal is 24 VAC hot.
“C” terminal is 24 VAC grounded.
“Y1” terminal is the compressor part load input.
“Y2” terminal is the compressor full load input (“Y1”
must also be energized along with “Y2”).
“O” terminal is the reversing valve input. The reversing
valve must be energized for cooling mode.
“A” terminal is 24 VAC output to external flow center
control, or to source water solenoid coil.
“L” terminal is compressor lockout output. This
terminal is activated on a high pressure, low pressure, or
flow switch trip on the Geothermal Logic Control. This
is a 24 VAC output.
LOW VOLTAGE CONNECTIONS FOR DDC CONTROLS
Heating Part Load
Energize “Y1”
Heating Full Load
Energize “Y1”, “Y2”
Cooling Part Load
Energize “Y1”, “O”
Cooling Full Load
Energize “Y1”, “Y2”, “O”
PIPING ACCESS TO UNIT
Water Piping to and from the unit enters the unit cabinet on
either the front or rear-side through the ability to relocate the
control panel. See Figure 3 of the cabinet.
LOOP CONNECTIONS are a special double o-ring fitting
with a retainer nut that secures it in place. (It is the same
style of fitting used for the flow center connection on ground
loop applications.)
NOTE: All double o-ring fittings require “hand
tightening only”. Do not use a wrench or pliers as
retainer nut can be damaged with excessive force.
Various fittings are available so you may then connect to the
unit with various materials and methods. These methods
include 1" barbed fitting (straight and 90°), 1" MPT (straight
and 90°), and 1-14" hot fusion fitting (straight only). See
Product Specification Sheet.
LOAD CONNECTIONS are standard 1" Female Pipe
Thread allowing for any standard 1" Male Pipe Threaded
fittings to be utilized to make the connection.
DESUPERHEATER CONNECTIONS are standard ½"
Female Pipe Thread allowing for any standard ½" Male Pipe
Threaded fittings to be utilized to make the connection.
NOTE: Apply provided petroleum jelly to o-rings to
prevent damage and to aid in insertion.
Manual2100-583A
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13 of 48
LOAD SIDE WATER CONNECTIONS
The use of a buffer tank is highly recommended on the
load side of the GW-Series Water-to-Water heat pumps.
If heat pump sizing at all the various conditions is not
perfectly matched to the load, you are likely to short cycle
the refrigerant system on high or low pressure controls.
Buffer tanks provide thermal mass that allows the rate of
generation by the heat source to be significantly different
from the rate of dissipation by the distribution system. They
are an essential component in any hydronic system that uses
a low thermal mass on/off heat source in combination with a
multiple-zone application.
For example, assume it’s desired that a heat pump operates
with a minimum compressor on-cycle duration of 10
minutes. The heat pump, when on, supplies 50,000 Btu/h.
The compressor turns on when the buffer tank drops to
100°F, and off when the tank reaches 120°F. What is the
necessary buffer tank volume to accomplish this?
SIZING BUFFER TANKS FOR ZONED
SYSTEMS
If a tank larger than the minimum required volume is used,
the on-cycle length could be increased, or the temperature
differential setpoint could be reduced
The required volume of a buffer tank depends on the rate of
heat input and release, as well as the allowed temperature
rise of the tank from when the heat source is turned on, to
when it is turned off. The greater the tanks volume, and the
wide the operating temperature differential, the longer the
heat source cycle length.
The following fomula can be used to calculate the volume
necessary when given a specified minimum heat source ontime, tank operating differential, and rate of heat transfer:
v=
t x Qheatsource
500 x
T
Where:
v = required volume of the buffer tank (gallons)
t = desired duration of the heat source’s “on cycle”
(minutes)
Qheatsource = heat output rate of the heat source (Btu/h)
Qload = rate of heat extraction from the tank (Btu/h)
DT = temperature rise of the tank from when the heat source
is turned on to when it is turned off (°F).
Manual2100-583A
Page 14 of 48
v =
10 x 50,000
500 x (120-100)
= 50 gallons
The wider the temperature differential, and the greater the
volume of the tank, the longer the heat source on-cycle will
be.
Manual2100-583A
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PRESSURE REDUCING
VALVE W/BACKFLOW
PREVENTER
RETURN
HEADER
MAKE-UP-WATER
PURGE
VALVES
SUPPLY
HEADER
ZONE
VALVES
TO/FROM OTHER
ZONES
EXPANSION
TANK
AQUA STAT
CIRCULATOR
AIR
SEPARATOR
OUTDOOR
TEMPERATURE
SENSOR
BUFFER TANK
TEMPERATURE
SENSOR
AUTO AIR
PURGE
HYDRONIC AIR HANDLER
PURGE
VALVE
PURGE
VALVE
CIRCULATOR
FIGURE 5
A TYPICAL LOAD SIDE HYDRONIC SYSTEM
MIS-3164 A
GEOTHERMAL HEAT PUMP
NOTE: REQUIRES
PRESSURE/TEMPERATURE RELIEF
VALVE WITH TYPICAL 30 PSIG
SETPOINT. (MAY VARY BY LOCAL
CODE. CONSULT LOCAL CODES FOR
INSTALL REQUIREMENTS.)
GROUND LOOP (EARTH COUPLED WATER LOOP APPLICATIONS)
NOTE: Unit shipped from factory with 75 PSIG low
pressure switch wired into control circuit and must be
rewired to 55 PSIG low pressure switch for ground
loop applications. This unit is designed to work on earth
coupled water loop systems, however, these systems operate
at entering water (without antifreeze) temperature with
pressures well below the pressures normally experienced in
water well systems.
THE CIRCULATION SYSTEM DESIGN
Equipment room piping design is based on years of
experience with earth coupled heat pump systems. The
design eliminates most causes of system failure.
The heat pump itself is rarely the cause. Most problems
occur because designers and installers forget that a ground
loop “earth coupled” heat pump system is NOT like a
household plumbing system.
Most household water systems have more than enough
water pressure either from the well pump or the municipal
water system to overcome the pressure of head loss in ½
inch or ¾ inch household plumbing. A closed loop earth
coupled heat pump system however, is separated from the
pressure of the household supply and relies on a small, low
wattage pump to circulate the water and antifreeze solution
through the earth coupled heat pump and equipment room
components.
The small circulator keeps the operating costs of the system
to a minimum. However, the performance of the circulator
MUST be closely matched with the pressure head loss of the
entire system in order to provide the required flow through
the heat pump. Insufficient flow through the heat exchanger
is one of the most common causes of system failure. Proper
system piping design and circulator selection will eliminate
the problem.
FIGURE 6
CIRCULATOR SYSTEM DESIGN
PIPE FROM
GOUND LOOP
PIPE TO
GROUND LOOP
PUMP MODULE
STRAIGHT BARBED
BRASS ADAPTERS
OPTIONAL VISUAL
FLOW METER
NOTE: IF USED SUPPORT
WITH A FIELD FABRICATED
WALL BRACKET
WATER OUT
NOTE: APPLY PETROLEUM
JELLY TO O-RINGS TO PREVENT
DAMAGE AND AID IN INSERTION
WATER IN
HOSE CLAMPS
1" FLEXIBLE HOSE
MIS-3165
Manual2100-583A
Page 16 of 48
FIGURE 7A
Thermometer
NOTE: Slide retaining cap back to expose
double o-rings. Apply petroleum jelly to o-rings
to prevent damage and aid in insertion
Dial face pressure guage
with guage adaptor
40
30
20
50
60
70
Retaining cap, hand tighten only
80
90
100
10
110
0
120
Pete's test plug
Test plug cap
Barbed 90° adapter
MIS-2622 A
FIGURE 7B
PERFORMANCE MODEL DORFC-1 FLOW CENTER
FIGURE 7C
PERFORMANCE MODEL DORFC-2 FLOW CENTER
Manual2100-583A
Page
17 of 48
GROUND WATER (WELL SYSTEM APPLICATIONS)
NOTE: It is highly recommended on ground water
systems (pump & dump) that a cupronickel coaxial coil
is utilized on the source side of the system. Not doing
so, may void the product warranty due to aggressive/
corrosive/highly oxygenated water attacking the copper
coaxial water coil.
NOTE: Unit shipped from factory with 75 PSIG low
pressure switch wired into control circuit for ground
water applications.
WATER CONNECTIONS
It is very important that an adequate supply of clean,
non-corrosive water at the proper pressure be provided
before installation is made. Insufficient water, in the
heating mode for example, will cause the low pressure
switch to trip, shutting down the heat pump. In assessing
the capacity of the water system, it is advisable that the
complete water system be evaluated to prevent possible
lack of water or water pressure at various household
fixtures whenever the heat pump turns on. All plumbing
to and from the unit is to be installed in accordance with
local plumbing codes. The use of plastic pipe, where
pemissible, is recommended to prevent electrolytic
corrosion of the water pipe. Because of the relatively cold
temperatures encountered with well water, it is strongly
recommended that the water lines connecting the unit be
insulated to prevent water droplets from condensing on the
pipe surface.
Refer to piping, Figure 8. Slow open/close Electrically
Actuated Valve with End Switch (2), 24V, provides on/off
control of the water flow to the unit. Refer to the wiring
diagram for correct hookup of the valve solenoid coil.
Constant Flow Valve (3) provides correct flow of water
to the unit regardless of variations in water pressure.
Observe the water flow direction indicated by the arrow on
the side of the valve body.
Strainer (8) installed upstream of water coil inlet to
collect foreign material which would clog the flow valve
orifice.
The figure shows the use of shutoff valves (4) and (5), on
the in and out water lines to permit isoation of the unit
from the plumbing system should future service work
require this. Globe valves should not be used as shutof
valves because of the excessive pressure drop inherent in
the valve design. Instead, use either gate or ball valves as
shutoffs, so as to minimize pressure drop.
Hose bib (6) and (7), and tees should be included to permit
acid cleaning the refrigerant-to-water coil should such
cleaning be required. See WATER CORROSION.
Hose bib (1) provides access to the system to check water
flow through the constant flow valve to ensure adequate
water flow through the unit. A water meter is used to
check the water flow rate.
WELL PUMP SIZING
Strictly speaking, sizing the well pump is the
responsibility of the well drilling contractor. It is
important, however, the HVAC contractor be familiar with
the factors that determine what size pump will be required.
Rule of thumb estimates will invariably lead to under or
oversized well pumps. Undersizing the pump will result
in inadequate water to the whole plumbing system, but
with especially bad results to the heat pump - NO HEAT/
NO COOL calls will result. Oversized pumps will short
cycle and could cause premature pump motor or switch
failures.
The well pump must be capable of supplying enough
water and at an adequate pressure to meet competing
demands of water fixtures. The well pump must be sized
in such a way that three requirements are met:
1. Adequate flow rate in GPM.
2. Adequate pressure at the fixture.
3. Able to meet established flow rates and pressures
from the depth of the well-feet of lift.
Manual2100-583A
Page 18 of 48
GROUND WATER (WELL SYSTEM APPLICATIONS)
The pressure requirements put on the pump are directly
affected by the diameter of pipe being used, as well as the
water flow rate through the pipe. The worksheet included
in Manual 2100-078 should guarantee the well pump has
enough capacity. It should also ensure that the piping is
not undersized, which would create too much pressure due
to friction loss. High pressure losses due to undersized
pipe will reduce efficiency and require larger pumps and
could also create water noise problems.
FIGURE 8
WATER CONNECTION COMPONENTS
3
2
1
5
4
6
7
8
MIS-3166
Manual2100-583A
Page
19 of 48
GROUND WATER (WELL SYSTEM APPLICATIONS)
SYSTEM START UP PROCEDURE FOR
GROUND WATER APPLICATIONS
1. Be sure main power to the unit is OFF at disconnect.
2. Set thermostat system switch to OFF.
3. Move main power disconnect to ON. Except as
required for safety while servicing – DO NOT
OPEN THE UNIT DISCONNECT SWITCH.
4. Fully open the manual inlet & outlet valves, and
manually open water solenoid valve on the source side.
5. Check water flow.
a.Connect a water flow meter to the drain cock
between the constant flow valve and the solenoid valve.
b.Check the water flow rate through the constant flow
valve and the solenoid valve. Run a hose from the
flow meter to a drain or sink. Open the drain cock.
c.When water flow is okay, close the drain cock and
remove the water flow meter. The unit is now ready
to start.
6. Start the unit in heating mode by switching on the
Aquastat.
a.Make sure the water solenoid valve actuated/
opened.
7. Check the system refrigerant pressures against the
refrigerant pressure table located on the backside
of the system service door at the corresponding
source and load flow rates and enetering water
temperatures. If the refrigerant pressures do not
match, check for water flow issues, and then a
refrigeration system problem.
8. Switch the Aquastat/thermostat to cooling mode
and again verify water solenoid actuation, and
refrigerant pressures.
NOTE: If a charge problem is determined (high or low):
A. Check for possible refrigerant loss.
B. Reclaim all remaining refrigerant.
C. Evacuate unit down to 29" of vacuum.
D. Recharge unit with refrigerant by weight to the serial
plate, as this is the only way to ensure proper charge.
WATER CORROSION
Two concerns will immediately come to light when
considering a water source heat pump, whether for ground
water or for a ground loop application: Will there be enough
water? And, how will the water quality affect the system?
Water quantity is an important consideration and one which
is easily determined. The well driller must perform a pump
down test on the well according to methods described
by the National Well Water Association. This test, if
performed correctly, will provide information on the rate
of flow and on the capacity of the well. It is important to
Manual2100-583A
Page 20 of 48
consider the overall capacity of the well when thinking
about a water source heat pump because the heat pump
may be required to run for extended periods of time.
The second concern, about water quality, is equally
important. Generally speaking, if the water is not offensive
for drinking purposes, it should pose no problem for
the heat pump. The well driller or local water softening
company can perform tests which will determine the
chemical properties of the water.
Water quality problems will show up in the heat pump in
one or more of the following ways:
• Decrease in water flow through the unit.
• Decreased heat transfer of the water coil (entering to
leaving water temperature difference is less).
There are four main water qualtiy problems associated with
ground water. These are:
1. Biological Growth This is the growth of microscopic
organisms in the water and will show up as a slimy deposit
throughout the water system. Shock treatment of the well
is usually required and this is best left to the well driller.
The treatment consists of injecting chlorine into the well
casing and flushing the system until all growth is removed.
2. Suspended Particles in the Water Filtering will
usually remove most suspended particles (fine sand, small
gravel) from the water. The problem with suspended
particles in the water is it will erode metal parts, pumps,
heat transfer coils, etc. As long as the filter is cleaned and
periodically maintained, suspended particles should pose
no serious problem. Consult with your well driller.
3. Corrosion of Metal Corrosion of metal parts results
from either highly corrosive water (acid water, generally
not the case with ground water), or galvanic reaction
between dissimilar metals in the presence of water. By
using plastic plumbing or dielectric unions, galvanic
reaction is eliminated. The use of corrosion resistant
materials such as a Cupronickel Water Coil through the
water system will reduce corrosion problems significantly.
4. Scale Formation Of all the water problems, the
formation of scale by ground water is by far the most
common. Usually due to the formation of calcium
carbonate, but magnesium carbonate or calcium sulfate
may also be present. Carbon dioxide gas (CO2), the
carbonate of calcium and magnesium carbonate, is very
soluble in water. It will remain dissoved in the water
until some outside factor upsets the balance. This outside
influence may be a large change in water temperature or
pressure. When this happens, enough carbon dioxide gas
combines with the dissolved calcium or magnesium in
the water and falls out of solution until a new balance is
reached. The change in temperature that this heat pump
produces is usually not high enough to cause the dissoved
gas to fall out of solution. Likewise, if pressure drops
are kept to a reasonable level, no precipitation of carbon
dioxide should occur.
GROUND WATER (WELL SYSTEM APPLICATIONS)
REMEDIES OF WATER PROBLEMS
Water Treatment. Water treatment can usually be
economically justified for water loop systems. However,
because of the large amounts of water involved with a
ground water system, water treatment is generally too
expensive.
Acid Cleaning the Water Coil or Heat Pump Recovery
Unit. If scaling of the coil is strongly suspected, the coil
can be cleaned with a solution of Phosphoric Acid (food
grade acid). Follow the manufacturer’s directions for
mixing, use, storage, etc. Refer to the “Cleaning Water
Coil”, Figure 9. The acid solution can be introduced in
the heat pump coil through the hose bib A. Be sure the
isolation valves are closed to prevent contamination of the
rest of the system by the coil. The acid should be pumped
from a bucket into the hose bib and returned to the bucket
through the other hose bib B. Follow the manufacturer’s
directions for the product used as to how long the solution
is to be circulated, but it is usually circulated for a period
of several hours.
FIGURE 9
WATER COIL CLEANING
HOSE BIB (A)
HOSE BIB (B)
PUMP
MIS-3167
Manual2100-583A
Page
21 of 48
GROUND WATER (WELL SYSTEM APPLICATIONS)
LAKE AND POND INSTALLATIONS
Lakes and ponds can provide a low cost source of water
for heating and cooling with a ground water heat pump.
Direct usage of the water without some filtration is not
recommended as algae and turbid water can foul the water
to refrigerant heat exchanger. Instead, there have been
very good results use a dry well dug next to the water line
or edge. Normal procedure in installing a dry well is to
backhoe a 15 to 20 foot hole adjacent to the body of water
(set backhoe as close to water’s edge as possible). Once
excavated, a perforated plastic casing should be installed
with gravel backfill placed around the casing. The gravel
bed should provide adequate filtration of the water to
allow good performance of the ground water heat pump.
The following is a list of recommendations to follow when
installing this type of system:
E. A pressure tank should be installed in dwelling to
be heated adjacent to the the ground water heat
pump. A pressure switch should be installed at the
tank for pump control.
F. All plumbing should be carefully sized to
compensate for friction losses, etc., particularly if
the pond or lake is over 200 feet from the dwelling
to be heated or cooled.
G. Keep all water lines below low water level and
below the frost line.
H. Most installers use 4-inch field tile (rigid plastic or
corrugated) for water return to the lake or pond.
I. The drain line discharge should be located at least
100 feet from the dry well location.
A. A lake or pond should be at least 1 acre (40,000
square feet) in surface area for each 50,000 BTUs
of ground water heat pump capacity or have 2 times
the cubic feet size of the dwelling that you are
trying to heat (includes basement if heated).
J. The drain line should be installed with a slope of
2 inches per 10 feet of run to provide complete
drainage of the line when the ground water heat
pump is not operating. This gradient should also
help prevent freezing of the discharge where the
pipe terminates above the frost line.
B. The average water depth should be at least 4 feet
and there should be an area where the water depth
is at least 12 to 15 feet deep.
K. Locate the discharge high enough above high water
level so the water will not back up and freeze inside
the drain pipe.
C. If possible, use a submersible pump suspended in
the dry well casing. Jet pumps and other types of
suction pumps normally consume more electrical
energy than similarly sized submersible pumps.
Pipe the unit the same as a water well system.
L. Where the local conditions prevent the use of a
gravity drainage system to a lake or pond, instead
run standard plastic piping out into the pond below
the frost and low water level.
D. Size the pump to provide necessary GPM for the
ground water heat pump. A 12 GPM or greater
water flow rate is required on all models when used
on this type system.
THIN ICE MAY RESULT IN THE VICINITY
OF THE DISCHARGE LINE.
For complete information on water well systems and lake
and pond applications, refer to Manual 2100-078 available
through your distributor.
Manual2100-583A
Page 22 of 48
DESUPERHEATER (POTABLE HOT WATER ASSIST)
DESCRIPTION
INSTALLATION PROCEDURE – GENERAL
The system is designed to heat domestic water using the
heat recovered from a water source unit’s hot discharge
gas.
Before beginning the installation, turn off all power
supplies to the water heater and unit, and shut off the main
water supply line.
LOCATION
TWO TANK – In order to realize the maximum energy
savings from the heat recovery system, it is recommended
that a second water storage tank be installed in addition to
the main hot water heater. Fossil Fuel fired water heaters
must be a two-tank installation.
Because of potential damage from freezing or
condensation, the unit must be located in a conditioned
space, therefore the unit must be installed indoors. Locate
the storage tank as close to the geothermal heat pump
and pump module as the installation permits. Keep in
mind that water lines should be a maximum of 25 feet
long measured one way. Also, the vertical lift should
not exceed 20 feet. This is to keep the pressure and heat
losses to a minimum.
ELECTRICAL CONNECTION
The desuperheater logic control with the remote thermal
sensors are built already hard-wired in the unit control
panel (when purchased with desuperheater option).
208/230-60-1 power for the desuperheater pump is
supplied with the same power as the compressor. The 24
volt signals needed are also tied in with the compressor
call signals.
NEVER ALTER OR PLUG FACTORY INSTALLED
PRESSURE RELIEF VALVE ON WATER HEATER
OR AUXILIARY TANK
Tanks specifically intended for hot water storage are
available from water heater manufacturers (solar hot water
storage tanks). A well insulated electric water heater
without the electric heating elements will also make a
suitable storage tank.
The size of the storage tank should be as large as space
and economy permit but in no event should it be less
than one-half of the daily water requirements for the
occupants. As a guide in estimating the daily family water
requirements, The Department of Energy recommends a
figure of 16.07 gallons of hot water per day per individual.
For example, a family of four would require 64.3 gallons
per day (4 x 16.07).
ONE TANK – The single hot water tank may be a
new hot water heater (sized to 100% of daily water
requirements) or the existing water heater in the case of a
retrofit installation. The existing water heater should be
drained and flushed to remove all loose sediment. This
sediment could damage the circulating pump. The bottom
heating element should be disconnected.
NOTE: Make sure water heater thermostats are set below
125°F on One Tank Unit.
Water Piping - All water piping must adhere to all
state and local codes. Refer to piping diagrams for
recommended one and two tank installations. Piping
connections are ½" nominal copper plumbing.
A cleanable “Y” type strainer should also be included to
collect any sediment.
Manual2100-583A
Page
23 of 48
DESUPERHEATER (POTABLE HOT WATER ASSIST)
OPERATION OF THE HEAT RECOVERY
UNIT
The pump module is a very simple device containing basic
controls and a circulating pump. Heat is transferred from
the hot refrigerant (discharge gas) to the cool water.
The operation of the Desuperheater Pump Module is
controlled first by the operation of the Geothermal
Heat Pump and secondly by internal controls with
desuperheater logic control. A low voltage signal sent in
tandem to the signal to energize the compressor contactor
is connected to the desuperheater logic control board, and
acts as the primary on/off switch for the circulating pump.
Also connected to this board is a temperature overlimit
device which shuts down the desuperheater once inlet
water has exceeded 125°F so the water cannot create a
scald condition.
There are also two (2) thermistor sensors connected to
the control board. These thermistors are measuring and
controlling to ensure there is a positive heat differential
across the water being circulated. When operating in
Part Load Condition, there are certain conditions (source
temperatures versus hot water temperatures) that potential
exists where heat could transfer into the refrigeration
system instead of the refrigeration system into the hot
water. Through the control board logic, these thermistors
ensure there is at least a 2° positive differential between
entering/leaving water temperatures, and will shut down
the pump accordingly.
Manual2100-583A
Page 24 of 48
START UP AND CHECK OUT
Be sure all shut off valves are open and all power supplies
are on. Open a hot water faucet to permit any air to bleed
from the plumbing.
NOTE: The inherent design of this pump for maximum
efficiency means this pump is not self-priming. It is
imperative to check the air has been adequately bled from
the system. There is a bleed-port built into desuperheater
coil water system that should be utilized after the
household water system has been fully restored. The
bleed port is located on the water-tube on the top of the
desuperheater exchange coil (above cooling expansion
valve in the GW-Series products).
Turn ON the heat pump system and verify the circulating
pump will operate. Feel the “WATER TO UNIT” and
“WATER FROM WATER HEATER” tubes for noticable
difference in temperature. Turn OFF the system and
verify that the circulating pump stops.
NOTE: When checking the refrigerant operating
pressures of the ground source heat pump the
desuperheater must be turned off. With the desuperheater
operating, a wide variance in pressure can result, giving
the service technician the indication there is a charge
problem when the unit is operating correctly.
MAINTENANCE
CLEANING THE HEAT EXCHANGER – If scaling of
the coil is strongly suspected, the coil can be cleaned with
a solution of phosphoric acid (food grade acid or liquid ice
machine cleaner {pre-mix phosphoric acid}). Follow the
manufacturer’s directions for the proper mixing and use of
cleaning agent.
DESUPERHEATER (POTABLE HOT WATER ASSIST)
FIGURE 10
DESUPERHEATER WIRING DIAGRAM
COMPRESSOR CONTACTOR SIGNAL
FROM GEOTHERMAL LOGIC CONTROL
3 AMP
FUSE
NC
LINE VOLTAGE
N
OUTLET
WATER SENSORS
C
NO
INLET
TSTAT
3
CONTROL
LOGIC
PUMP OUTLET
2
POWER
BLACK
BLACK
BLACK
BLACK
THERMISTOR
THERMISTOR
OVER TEMP. LIMIT
L
RED
PUMP
MOTOR
RED
MIS-2844 A
RED
BLACK
1
N
DESUPERHEATER
PUMP PLUG
L
BLACK
RED
C
24VAC
BLACK
C
R
RED
R
DESUPERHEATER
PUMP CONTROL
Y
LOW VOLTAGE
TERMINAL STRIP
BI-METAL
TEMPERATURE
LIMIT
208/230-60-1
LINE POWER
Manual2100-583A
Page
25 of 48
Manual2100-583A
Page 26 of 48
EXISTING WATER HEATER
L.P., GAS, OIL, ELECTRIC
WATER HEATER FACTORY
INSTALLED HIGH PRESSURE
RELIEF VALVE
HOT WATER
TO HOUSE
HIGH PRESSURE
RELIEF VALVE
IN
WATER SOURCE UNIT
SHUTOFF
VALVES
DRAIN
STRAINER
OUT
OPTIONAL
CHECK VALVE
(PER CODES)
COLD WATER IN
IN
OUT
DESUPERHEATER PUMP
SHIPPED DISCONNECTED
FROM FACTORY, CONNECT
3 PIN POWER PLUG TO
CONTROL PANEL
MIS-3169 A
WHEN WATER STORAGE IS INSTALLED IN VERTICAL
POSITION, PIPING TO "IN" SIDE OF PUMP MUST BE
INSTALLED AT BOTTOM AS SHOWN.
ALL PLUMBING MUST CONFORM TO LOCAL CODES
NOTES: DO NOT OPERATE PUMP WITHOUT WATER LINES
CONNECTED AND WATER IN SYSTEM WITH SHUT OFF
VALVES OPEN.
FIGURE 11
ONE-TANK DESUPERHEATER SYSTEM
DESUPERHEATER (POTABLE HOT WATER ASSIST)
OUT
ADDITIONAL HOT WATER
STORAGE TANK. NOT
ELECTRICALLY CONNECTED
DRAIN
EXISTING WATER HEATER
L.P., GAS, OIL, ELECTRIC
WATER HEATER
FACTORY INSTALLED
HIGH PRESSURE
RELIEF VALVES
HOT WATER
TO HOUSE
IN
IN
WATER SOURCE UNIT
IN
OUT
MIS-3170 A
WHEN WATER STORAGE IS INSTALLED IN VERTICAL
POSITION, PIPING TO "IN" SIDE OF PUMP MUST BE
INSTALLED AT BOTTOM AS SHOWN.
ALL PLUMBING MUST CONFORM TO LOCAL CODES
NOTES: DO NOT OPERATE PUMP WITHOUT WATER LINES
CONNECTED AND WATER IN SYSTEM WITH SHUT OFF
VALVES OPEN.
DESUPERHEATER PUMP
SHIPPED DISCONNECTED
FROM FACTORY, CONNECT
3 PIN POWER PLUG TO
CONTROL PANEL
SHUTOFF VALVES
OPTIONAL
CHECK VALVE
(PER CODES)
OPTIONAL
BYPASS LOOP
COLD WATER IN
SHUTOFF
VALVES
DRAIN
STRAINER
OUT
HIGH PRESSURE
RELIEF VALVE
FIGURE 12
TWO-TANK DESUPERHEATER SYSTEM
DESUPERHEATER (POTABLE HOT WATER ASSIST)
Manual2100-583A
Page
27 of 48
DESUPERHEATER (POTABLE HOT WATER ASSIST)
DESUPERHEATER CONTROL BOARD
SEQUENCE OF OPERATION
• If temperature difference is greater than 3°F, the
control will continue to energize the pump relay.
• If temperature difference is less than 3°F, then the
control will de-energize the pump relay.
• The control will next wait 10 minutes before
repeating first bullet point.
The desuperheating control board will make a
determination whether or not to energize the pump relay
inclusive on the control board.
A. It will constantly monitor inputs from two
temperature sensors, Inlet & Outlet water sensors.
E. The Over Temperature Limit Switch is placed in
series with line voltage. Therefore, continuity
between “L” of line voltage and “L” of pump
output is forced broken when the Over Temperature
Limit Switch opens (see wiring diagram).
B. It will constantly monitor the “CC” Compressor
Contactor Signal (only energized when compressor
is operating).
F. The 3-amp fuse is put in series with the “R”
connection to the board. Whenever the fuse is
blown, the control board will lose power and
consequently, the relay will disengage.
C. Upon acknowledgement of “CC” signal, and
following two minutes, the control board will
energize the pump relay.
D. After 1½ minutes, based upon temperature difference
between Outlet & Inlet sensors, and the presence of
“CC” signal, the following will take place:
FIGURE 13
INLET & OUTLET THERMISTOR TEMPERATURE CURVES
TEMPERATURE F VS. RESISTANCE R OF TEMPERATURE SENSOR
Manual2100-583A
Page 28 of 48
F
R
F
R
F
R
51
19374
76
10247
101
5697
52
18867
77
10000
102
5570
53
18375
78
9760
103
5446
54
17989
79
9526
104
5326
55
17434
80
9299
105
5208
56
16984
81
9077
106
5094
57
16547
82
8862
107
4982
58
16122
83
8653
108
4873
59
15710
84
8449
109
4767
60
15310
85
8250
110
4663
61
14921
86
8057
111
4562
62
14544
87
7869
112
4464
63
14177
88
7686
113
4367
64
13820
89
7507
114
4274
65
13474
90
7334
115
4182
66
13137
91
7165
116
4093
67
12810
92
7000
117
4006
68
12492
93
6840
118
3921
69
12183
94
6683
119
3838
70
11883
95
6531
120
3757
71
11591
96
6383
121
3678
72
11307
97
6239
122
3601
73
11031
98
6098
123
3526
74
10762
99
5961
124
3452
75
10501
100
5827
SEQUENCE OF OPERATION
PART LOAD COOLING
FULL LOAD HEATING
When the thermostat system switch is placed in “COOL”,
it completes a circuit from “R” to “O”, energizing
the reversing valve solenoid. On a call for cooling,
the thermostat completes a circuit from “R” to “Y1”
sending the signal to the Geothermal Logic Control. The
Geothermal Logic Control verifies that the High Pressure
Switch, the Low Pressure Switch, and the Flow Switch
control are all in the closed position. It then energizes the
“A” terminal output to start the flow center (Ground Loop
Applications) or energizes the water solenoid (Ground
Water/Water Loop Applications). Following 10 seconds of
the “A” terminal energization, the compressor contactor is
energized.
The unit should already be operating in Part Load Heating
operation prior to Full Load Cooling being energized
(see previous). Additionally, what occurs, the thermostat
completes a circuit from “R” to “Y2”. This sends a
signal to the compressor staging solenoid (plug on side of
compressor).
FULL LOAD COOLING
The unit should already be operating in Part Load Cooling
operation prior to Full Load Cooling being energized
(see above). Additionally, what occurs, the thermostat
completes a circuit from “R” to “Y2”. This sends a
signal to the compressor staging solenoid (plug on side of
compressor).
PART LOAD HEATING
GEOTHERMAL LOGIC CONTROL – If the controller
operates in normal mode, the Green Status Light blinks.
This indicates that 24 volt power is applied to the board
and the controller is running in normal operation.
On initial power up and call for compressor operation, a
5-minute delay + a random start delay of 0 to 60 seconds
is applied. After the random delay, the compressor relay
is energized (Terminal “CC”). When the “Y” input opens
the compressor de-energizes.
Water Solenoid – When “Y” signal is sent to Geothermal
Logic Control, the water solenoid output “A” terminal
will energize 10 seconds prior to “CC” output that starts
compressor.
Anti-Short Cycle Timer – After compressor shut-down,
or power disruption, a 5-minute timer is applied and
prevents the compressor from operating.
When thermostat is placed in “HEAT”, the reversing valve
solenoid is no longer energized. On a call for heating,
the thermostat completes a circuit from “R” to “Y1”
sending the signal to the Geothermal Logic Control. The
Geothermal Logic Control verifies that the High Pressure
Switch, the Low Pressure Switch, and the Flow Switch
control are all in the closed position. It then energizes the
“A” terminal output to start the flow center (Ground Loop
Applications) or energizes the water solenoid (Ground
Water/Water Loop Applications). Following 10 seconds of
the “A” terminal energization, the compressor contactor is
energized.
Manual2100-583A
Page
29 of 48
SEQUENCE OF OPERATION
HIGH PRESSURE SWITCH
INTELLIGENT RESET
(Terminals HP1 & HP2) Circuit will be proved as
“closed” prior to energizing “A” or “CC” terminals.
If pressure switch opens, compressor will go into
soft lockout mode and compressor operation will be
terminated; green fault light illuminated. Logic control
will then go through 5-minute delay on break + random
start sequence. If no fault found on next run cycle,
compressor will continue operation. If fault reoccurs, hard
lockout occurs, and fault singal is sent to “L” terminal.
The Geothermal Logic Control has an intelligent reset
feature after a safety control is activated. The controller
locks out the unit for 5 minutes, at the end of this period,
the controller checks to verify that all faults have been
cleared. If faults have been cleared, the controller restarts
the unit. If a second fault occurs, the controller will
lockout the unit until the control is reset by breaking “Y”
signal from thermostat. The last fault will be kept in
memory after a full lockout; this is only cleared by cycling
the unit power.
LOW PRESSURE SWITCH
(Terminals LP1 & LP2) Circuit will be proved as “closed”
prior to energizing “A” or “CC” terminals. The condition
of the LP terminals will then be ignored for the first
90 seconds after a demand for compressor operation.
Following this 90 second period, if pressure switch
opens, compressor will go into soft lockout mode and
compressor operation will be termininated; orange fault
light illuminated. The control board will then go through
a 5-minute delay on break + random start sequence. If no
fault found on next run cycle, compressor will continue
operation. If fault recoccurs, hard lockout occurs, and the
fault signal is sent to the “L” terminal.
FLOW SWITCH
(Terminals FS1 & FS2) Circuit will be proved as “closed”
prior to energizing “A” or “CC” terminals. If either flow
switch opens, compressor will go into soft lockout mode
and compressor operation will be terminated; red fault
light illuminated. Logic control will then go through
5-minute delay on break + random start sequence. If no
fault found on next run cycle, compressor will continue
operation. If fault reoccurs, hard lockout occurs, and fault
signal is sent to “L” terminal.
OVER & UNDER VOLTAGE PROTECTION
When an an under or over voltage condition exists, the
controller locks out the unit. When condition clears,
the controller automatically releases the unit to normal
operation and the compressor restarts after the random
start and anti-short cycle timings are met. The under &
over voltage protection starts at plus or minus 20% from
nominal voltage and returns to operation at plus or minus
10% from nominal voltage. All four (4) LED fault lights
will flash when an under or over voltage condition occurs.
The over voltage protection can be disabled by removing
the O/V jumper on the Geothermal Logic Control Board.
Manual2100-583A
Page 30 of 48
ALARM OUTPUT
The “L” terminal has 24 volts applied when a hard lockout
occurs. This can be used to drive a fault light or a low
voltage relay.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on all
units so the system operating pressures can be observed.
Pressure tables can be found later in this manual, and
also applied to the backside of the service door of the
unit. It is imperative to match the correct pressure table
to the unit by model number, and to the correct conditions
(temperature & flow rate). Also note that all pressure
tables are without the desuperheater operational.
CHECKING REFRIGERANT CHARGE
QUANTITY
The correct R-410A charge is shown on the unit rating
plate. Reference Figure 18 – 22 to validate proper system
operation. However, it is recommended that if incorrect
charge is suspected, the system refrigerant charge be
reclaimed, evacuated, and charge to nameplate charge
quantity and type
The nameplate charge quantity is optimized for thermal
performance and efficiency throughout all modes of
operation.
REFRIGERANT CHARGE
The models covered by this manual require R-410A
refrigerant, and Polyol Ester refrigerant oil.
GENERAL
1. Use separate service equipment to avoid cross
contamination of oil and refrigerants.
2. Use recovery equipment rated for R-410A
refrigerant.
3. Use manifold gauges rated for R-410A (800 psi
high-side/250psi low-side).
4. R-410A is a binary blend of HFC-32 and HFC-125.
5. R-410A is nearly azeotropic – similar to R-22 and
R-12. Although nearly azeotropic, charge with
liquid refrigerant.
6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot
withstand this higher pressure.
7. R-410A has an ozone depletion potential of zero,
but must be reclaimed due to its global warming
potential.
8. R-410A compressors use Polyol Ester Oil.
9. Polyol Ester is hydroscopic; it will rapidly absorb
moisture, and strongly hold this moisture in the oil.
TOPPING OFF SYSTEM CHARGE
If a leak has occurred in the system, reclaiming,
evacuating (see previous criteria), and charging to the
nameplate charge is recommended.
Topping off the system charge can be done without
problems. With R-410A, there are no significant changes
in the refrigerant composition during multiple leaks and
recharges. R-410A refrigerant is similar to an azeotropic
blend (it behaves like a pure compound or single
component refrigerant). The remaining refrigerant charge,
in the system, may be used after leaks have occurred
and then “top-off” the charge by utilizing the charging
charts on the service door of the unit or this manual as a
guideline.
REMEMBER: When adding R-410A refrigerant, it
must come out of the charging cylinder/tank as a liquid
to avoid any fractionation, and to ensure optimal system
performance. Refer to instructions for the cylinder that is
being utilized for proper method of liquid extraction.
SAFETY PRACTICES
1. Never mix R-410A with other refrigerants.
2. Use gloves and safety glasses, Polyol Ester oils can
be irritating to the skin, and liquid refrigerant will
freeze the skin.
10. A liquid line dryer must be used – even a deep
vacuum will not separate moisture from the oil.
3. Never use air and R-410A to leak check; the
mixture may become flammable.
11. Limit atmospheric exposure to 15 minutes.
4. Do not inhale R-410A – the vapor attacks
the nervous system, creating dizziness, loss
of coordination and slurred speech. Cardiac
irregularities, unconsciousness and ultimate death
can result from breathing this concentration.
12. If compressor removal is necessary, always plug
compressor immediately after removal. Purge with
small amount of nitrogen when inserting plugs.
5. Do not burn R-410A. This decomposition produces
hazardous vapors. Evacuate the area if exposed.
R-410A
6. Use only cylinders rated DOT4BA/4BW 400.
REFRIGERANT CHARGE
7. Never fill cylinders over 80% of total capacity.
This unit was charged at the factory with the quantity of
refrigerant listed on the serial plate. AHRI capacity and
efficiency ratings were determined by testing with this
refrigerant charge quantity.
8. Store cylinders in a cool area, out of direct sunlight.
The following pressure tables show nominal pressures for
the units. Since many installation specific situations can
affect the pressure readings, this information should only
be used by certified technicians as a guide for evaluating
proper system performance. They shall not be used to
adjust charge. If charge is in doubt, reclaim, evacuate and
recharge the unit to the serial plate charge.
9. Never heat cylinders above 125°F.
10. Never trap liquid R-410A in manifold sets, gauge
lines, or cylinders. R-410A expands significantly
at warmer temperatures. Once a cylinder or line is
full of liquid, any further rise in temperature will
cause it to rupture or burst.
Manual2100-583A
Page
31 of 48
COMPONENT LOCATION
FIGURE 14
SYSTEM COMPONENT LOCATIONS
WATER COIL
DESUPERHEATER
COIL
REVERSING
VALVE
LOW PRESSURE SWITCH
COMPRESSOR
HIGH PRESSURE
SWITCH
WATER COIL
FLOW SWITCH
EXPANSION
VALVE
DESUPERHEATER PUMP
FILTER DRIER
UNIT HIGH VOLTAGE
FLOW SWITCH
LOW VOLTAGE
MIS-3171
FIGURE 15
ELECTRICAL CONTROL LOCATIONS
FLOW CENTER
CIRCUIT BREAKERS
GROUND TERMINALS
FLOW CENTER
POWER CONNECTION
TERMINAL
STRIP
COMPRESSOR
CONTACTOR
RELAY
TRANSFORMER
PLUG
COMPRESSOR
CAPACITOR
SOLID STATE
RELAY
DESUPERHEATER
CONTROL BOARD
GEOTHERMAL
LOGIC BOARD
MIS-3172
Manual2100-583A
Page 32 of 48
REFRIGERATION SYSTEM DIAGRAMS
FIGURE 16
COOLING CYCLE DIAGRAM
Manual2100-583A
Page
33 of 48
REFRIGERATION SYSTEM DIAGRAMS
FIGURE 17
HEATING CYCLE DIAGRAM
Manual2100-583A
Page 34 of 48
FULL LOAD COOLING
FIGURE 18A — GW024 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
117
191
5
70
124
194
90
162
181
50
113
187
6
70
120
190
90
159
177
50
7**
50
111
180
7*
70
118
184
90
156
171
50
123
182
8
70
116
178
90
154
165
50
117
225
5
70
134
231
90
163
223
50
115
220
6
70
132
226
90
160
218
60
7**
50
113
214
7*
70
130
219
90
158
212
50
145
220
8
70
128
215
90
157
207
50
118
259
5
70
145
267
90
164
265
50
116
253
6
70
143
261
90
162
259
70
7**
50
115
247
7*
70
141
255
90
160
253
50
166
259
8
70
140
251
90
159
249
50
119
293
5
70
155
304
90
164
307
50
117
286
6
70
154
296
90
163
299
80
7**
50
117
281
7*
70
153
291
90
162
294
50
188
297
8
70
152
287
90
161
290
50
120
337
5
70
158
347
90
175
352
50
119
330
6
70
157
340
90
174
345
90
7**
50
118
325
7*
70
156
335
90
173
340
50
193
341
8
70
155
331
90
173
336
50
121
381
5
70
161
391
90
186
398
50
120
374
6
70
160
384
90
185
391
100
7**
50
120
369
7*
70
159
378
90
184
386
50
199
384
8
70
159
374
90
184
382
50
122
426
5
70
164
435
90
197
444
50
122
418
6
70
163
427
90
196
437
110
7**
50
121
413
7*
70
162
422
90
195
432
50
204
427
418
8
70
163
427
90
196
PART LOAD COOLING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
123
175
5
70
148
181
90
149
181
50
120
172
6
70
145
178
90
145
179
50
7**
50
118
168
7*
70
143
174
90
144
175
50
164
178
8
70
139
172
90
140
172
50
124
210
5
70
154
217
90
162
219
50
121
206
6
70
151
213
90
160
215
60
7**
50
120
202
7*
70
150
209
90
158
211
50
177
214
8
70
147
207
90
156
209
50
125
244
5
70
159
252
90
176
257
50
123
240
6
70
158
248
90
174
252
70
7**
50
122
236
7*
70
156
244
90
173
248
50
190
249
8
70
156
241
90
172
246
50
125
279
5
70
165
288
90
189
294
50
125
274
6
70
164
282
90
189
289
80
7**
50
124
270
7*
70
163
278
90
188
285
50
203
284
8
70
164
276
90
189
283
50
127
323
5
70
167
331
90
198
338
50
126
318
6
70
167
326
90
197
333
90
7**
50
125
314
7*
70
166
322
90
196
329
50
207
328
8
70
166
320
90
197
327
50
128
366
5
70
170
375
90
206
382
50
127
361
6
70
169
370
90
205
377
100
7**
50
126
357
7*
70
168
366
90
204
374
50
211
372
8
70
169
363
90
205
371
50
129
409
5
70
172
418
90
214
426
50
128
405
6
70
172
414
90
214
422
110
7**
50
127
401
7*
70
171
410
90
213
418
50
214
416
407
8
70
171
415
90
213
Manual2100-583A
Page
35 of 48
FULL LOAD HEATING
FIGURE 18B — GW024 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
62
198
5
90
64
305
120
67
450
60
63
199
6
90
65
305
120
67
450
20
7**
60
64
198
7*
90
66
305
120
68
450
60
68
412
8
90
66
306
120
69
450
60
78
203
5
90
81
310
120
84
455
60
80
203
6
90
82
311
120
85
455
30
7**
60
81
203
7*
90
83
311
120
86
455
60
87
419
8
90
84
311
120
87
455
60
94
207
5
90
98
315
120
101
459
60
96
208
6
90
99
316
120
103
460
40
7**
60
98
208
7*
90
101
317
120
105
461
60
105
425
8
90
102
317
120
106
461
60
110
211
5
90
114
321
120
119
464
60
113
212
6
90
117
321
120
121
465
50
7**
60
115
213
7*
90
118
322
120
123
466
60
124
432
8
90
120
323
120
124
466
60
121
214
5
90
134
326
120
141
470
60
124
215
6
90
137
327
120
144
470
60
7**
60
125
216
7*
90
138
328
120
145
471
60
153
441
8
90
140
328
120
146
472
60
131
216
5
90
154
332
120
163
475
60
134
217
6
90
157
333
120
166
476
70
7**
60
136
218
7*
90
159
334
120
167
477
60
182
450
8
90
160
334
120
169
477
60
142
219
5
90
174
338
120
185
480
60
145
220
6
90
177
339
120
188
481
80
7**
60
146
221
7*
90
179
340
120
190
482
60
212
459
340
8
90
179
483
120
191
Manual2100-583A
Page 36 of 48
PART LOAD HEATING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
66
190
5
90
68
296
120
70
435
60
66
190
6
90
69
296
120
71
436
20
7**
60
67
190
7*
90
70
296
120
72
436
60
72
402
8
90
69
296
120
72
436
60
83
194
5
90
86
300
120
89
441
60
84
194
6
90
87
301
120
90
441
30
7**
60
85
194
7*
90
88
301
120
91
441
60
91
407
8
90
88
301
120
91
441
60
101
198
5
90
104
305
120
107
446
60
102
198
6
90
105
305
120
109
447
40
7**
60
103
198
7*
90
106
306
120
110
447
60
110
413
8
90
107
305
120
111
447
60
118
202
5
90
122
310
120
126
452
60
120
202
6
90
123
310
120
128
452
50
7**
60
121
203
7*
90
125
310
120
129
453
60
129
418
8
90
126
310
120
130
453
60
131
205
5
90
143
314
120
149
456
60
134
206
6
90
146
315
120
151
457
60
7**
60
135
206
7*
90
147
315
120
153
457
60
161
424
8
90
149
315
120
154
457
60
145
209
5
90
165
319
120
172
461
60
148
209
6
90
168
320
120
174
461
70
7**
60
150
210
7*
90
170
320
120
177
462
60
192
431
8
90
172
321
120
178
462
60
158
212
5
90
187
324
120
194
465
60
161
213
6
90
190
325
120
198
466
80
7**
60
164
214
7*
90
193
326
120
200
467
60
224
438
326
8
90
195
467
120
202
FULL LOAD COOLING
FIGURE 19A — GW036 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
93
192
6
70
97
191
90
101
192
50
91
187
7
70
94
186
90
99
187
50
9**
50
89
177
9*
70
92
177
90
96
177
50
93
177
11
70
90
177
90
94
178
50
101
230
6
70
106
231
90
111
231
50
99
224
7
70
104
225
90
108
226
60
9**
50
96
214
9*
70
101
215
90
105
216
50
104
215
11
70
99
214
90
104
215
50
108
267
6
70
115
270
90
120
271
50
106
261
7
70
113
264
90
118
265
70
9**
50
102
251
9*
70
109
254
90
114
255
50
115
254
11
70
108
251
90
113
252
50
115
305
6
70
123
309
90
129
310
50
114
298
7
70
122
303
90
128
304
80
9**
50
109
288
9*
70
117
293
90
123
294
50
126
292
11
70
117
288
90
123
289
50
116
349
6
70
130
355
90
137
357
50
115
342
7
70
128
348
90
136
350
90
9**
50
111
332
9*
70
125
338
90
132
340
50
138
338
11
70
125
332
90
132
334
50
117
393
6
70
137
400
90
145
403
50
116
386
7
70
135
393
90
143
396
100
9**
50
113
375
9*
70
132
383
90
141
385
50
151
384
11
70
132
377
90
140
380
50
118
437
6
70
143
446
90
153
449
50
116
429
7
70
142
438
90
151
441
110
9**
50
115
419
9*
70
140
428
90
149
431
50
164
430
422
11
70
139
425
90
148
PART LOAD COOLING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
119
182
6
70
120
181
90
123
182
50
116
184
7
70
117
183
90
120
183
50
9**
50
113
175
9*
70
114
174
90
118
174
50
115
169
11
70
114
170
90
117
170
50
120
218
6
70
132
220
90
137
221
50
118
217
7
70
129
219
90
134
220
60
9**
50
115
208
9*
70
126
211
90
132
212
50
136
209
11
70
124
206
90
130
207
50
121
253
6
70
143
259
90
150
261
50
120
250
7
70
141
255
90
148
257
70
9**
50
117
242
9*
70
138
247
90
146
249
50
156
248
11
70
135
243
90
142
245
50
123
288
6
70
154
297
90
163
300
50
121
283
7
70
153
292
90
162
294
80
9**
50
119
275
9*
70
150
284
90
160
287
50
177
288
11
70
145
279
90
155
282
50
124
332
6
70
158
341
90
173
345
50
122
326
7
70
157
335
90
172
339
90
9**
50
120
318
9*
70
155
327
90
170
332
50
185
332
11
70
151
323
90
166
327
50
125
375
6
70
161
384
90
182
390
50
124
369
7
70
160
378
90
181
384
100
9**
50
122
362
9*
70
159
371
90
180
376
50
193
375
11
70
156
366
90
177
372
50
126
418
6
70
165
427
90
192
434
50
125
412
7
70
164
421
90
191
428
110
9**
50
123
405
9*
70
163
414
90
190
421
50
201
419
409
11
70
161
416
90
188
Manual2100-583A
Page
37 of 48
FULL LOAD HEATING
FIGURE 19B — GW036 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
59
203
6
90
60
311
120
63
455
60
59
204
7
90
60
312
120
64
456
20
9**
60
60
204
9*
90
62
312
120
65
456
60
64
420
11
90
63
312
120
66
456
60
72
208
6
90
75
317
120
79
460
60
73
209
7
90
76
317
120
80
461
30
9**
60
75
210
9*
90
78
318
120
82
462
60
83
427
11
90
80
318
120
84
462
60
86
213
6
90
91
322
120
95
466
60
87
214
7
90
92
322
120
97
466
40
9**
60
90
215
9*
90
95
323
120
99
467
60
101
433
11
90
96
324
120
101
468
60
99
218
6
90
106
328
120
111
471
60
101
218
7
90
108
328
120
113
471
50
9**
60
105
220
9*
90
111
329
120
117
472
60
120
439
11
90
113
330
120
119
474
60
103
222
6
90
117
334
120
125
477
60
105
222
7
90
119
334
120
128
478
60
9**
60
108
223
9*
90
121
335
120
130
479
60
137
448
11
90
123
336
120
132
480
60
107
225
6
90
128
340
120
140
484
60
109
226
7
90
130
341
120
142
485
70
9**
60
111
226
9*
90
132
341
120
143
485
60
153
457
11
90
133
342
120
145
486
60
111
228
6
90
139
346
120
154
490
60
114
229
7
90
141
347
120
156
491
80
9**
60
114
230
9*
90
142
348
120
157
492
60
170
466
348
11
90
143
492
120
157
Manual2100-583A
Page 38 of 48
PART LOAD HEATING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
63
193
6
90
66
300
120
69
442
60
64
193
7
90
66
300
120
69
442
20
9**
60
65
193
9*
90
67
300
120
70
443
60
70
407
11
90
67
300
120
71
443
60
79
198
6
90
82
305
120
86
447
60
80
198
7
90
83
305
120
87
448
30
9**
60
82
199
9*
90
85
306
120
88
448
60
88
413
11
90
86
306
120
89
448
60
95
203
6
90
99
310
120
103
452
60
97
203
7
90
100
310
120
105
453
40
9**
60
99
204
9*
90
102
311
120
107
453
60
107
418
11
90
104
311
120
108
454
60
112
208
6
90
116
315
120
120
457
60
113
208
7
90
117
315
120
122
458
50
9**
60
116
209
9*
90
120
316
120
125
458
60
126
424
11
90
122
317
120
127
459
60
120
209
6
90
133
320
120
140
463
60
121
210
7
90
135
321
120
142
463
60
9**
60
124
211
9*
90
137
322
120
144
464
60
153
433
11
90
139
322
120
146
465
60
128
211
6
90
151
326
120
160
469
60
129
211
7
90
152
326
120
162
469
70
9**
60
131
213
9*
90
154
327
120
164
470
60
179
443
11
90
156
328
120
165
471
60
136
213
6
90
168
331
120
180
474
60
137
213
7
90
170
331
120
181
475
80
9**
60
139
214
9*
90
172
333
120
183
476
60
206
452
334
11
90
173
477
120
184
FULL LOAD COOLING
FIGURE 20A — GW048 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
107
207
7
70
104
208
90
108
210
50
103
196
9
70
100
198
90
104
200
50
11**
50
101
190
11*
70
98
191
90
102
193
50
93
189
13
70
97
187
90
101
189
50
109
244
7
70
115
249
90
120
251
50
105
232
9
70
111
237
90
116
240
60
11**
50
103
225
11*
70
109
230
90
114
232
50
114
230
13
70
107
226
90
113
228
50
111
281
7
70
126
290
90
132
293
50
107
268
9
70
122
277
90
128
280
70
11**
50
104
260
11*
70
120
269
90
125
272
50
134
272
13
70
118
264
90
124
267
50
112
319
7
70
137
330
90
144
334
50
109
304
9
70
133
316
90
140
320
80
11**
50
106
296
11*
70
131
307
90
137
311
50
154
314
13
70
129
302
90
136
306
50
112
363
7
70
142
376
90
153
381
50
109
349
9
70
139
361
90
150
367
90
11**
50
108
340
11*
70
137
352
90
148
358
50
165
359
13
70
136
347
90
147
353
50
112
408
7
70
146
421
90
161
429
50
110
394
9
70
145
406
90
160
415
100
11**
50
109
385
11*
70
143
397
90
158
405
50
177
404
13
70
143
392
90
158
400
50
112
453
7
70
151
466
90
170
476
50
111
439
9
70
150
452
90
170
462
110
11**
50
111
429
11*
70
150
442
90
169
453
50
189
449
437
13
70
150
447
90
169
PART LOAD COOLING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
120
195
7
70
128
195
90
132
194
50
114
187
9
70
122
187
90
125
186
50
11**
50
111
183
11*
70
119
183
90
122
182
50
125
183
13
70
117
183
90
120
182
50
120
229
7
70
138
233
90
144
234
50
115
220
9
70
133
224
90
139
226
60
11**
50
113
215
11*
70
131
219
90
137
221
50
148
222
13
70
129
218
90
135
220
50
119
263
7
70
147
271
90
155
275
50
116
253
9
70
144
261
90
152
265
70
11**
50
115
248
11*
70
143
256
90
151
259
50
171
261
13
70
142
253
90
150
257
50
118
297
7
70
156
309
90
167
315
50
117
287
9
70
156
298
90
166
305
80
11**
50
116
280
11*
70
155
292
90
166
298
50
194
300
13
70
155
288
90
165
294
50
119
341
7
70
159
353
90
179
361
50
119
330
9
70
158
342
90
179
350
90
11**
50
118
324
11*
70
158
336
90
178
344
50
198
344
13
70
158
332
90
178
340
50
121
385
7
70
162
397
90
192
407
50
120
374
9
70
161
386
90
191
396
100
11**
50
120
368
11*
70
161
380
90
191
390
50
202
387
13
70
161
375
90
191
385
50
122
428
7
70
164
440
90
205
452
50
122
417
9
70
164
430
90
204
442
110
11**
50
122
412
11*
70
164
424
90
204
436
50
206
431
419
13
70
164
431
90
204
Manual2100-583A
Page
39 of 48
FULL LOAD HEATING
FIGURE 20B — GW048 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
58
209
7
90
59
326
120
64
479
60
62
211
9
90
62
327
120
68
481
20
11**
60
58
209
11*
90
59
326
120
64
479
60
57
452
13
90
57
336
120
63
490
60
72
216
7
90
74
331
120
79
483
60
76
217
9
90
77
333
120
83
484
30
11**
60
74
216
11*
90
76
332
120
81
483
60
80
448
13
90
78
332
120
84
484
60
86
222
7
90
89
336
120
94
486
60
89
223
9
90
92
338
120
98
488
40
11**
60
90
223
11*
90
93
337
120
98
487
60
102
443
13
90
100
329
120
105
479
60
99
228
7
90
104
342
120
109
490
60
103
229
9
90
107
343
120
112
491
50
11**
60
106
230
11*
90
110
343
120
115
491
60
125
439
13
90
121
325
120
126
473
60
108
233
7
90
122
349
120
131
496
60
112
234
9
90
126
350
120
135
498
60
11**
60
114
235
11*
90
128
351
120
138
498
60
149
455
13
90
136
339
120
145
487
60
117
237
7
90
140
355
120
154
502
60
121
239
9
90
144
358
120
158
504
70
11**
60
123
240
11*
90
146
359
120
160
505
60
173
472
13
90
150
354
120
164
500
60
126
242
7
90
159
362
120
177
508
60
130
244
9
90
162
365
120
180
511
80
11**
60
131
246
11*
90
164
366
120
182
512
60
198
489
368
13
90
165
514
120
184
Manual2100-583A
Page 40 of 48
PART LOAD HEATING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
63
201
7
90
66
309
120
70
451
60
64
201
9
90
66
309
120
71
451
20
11**
60
64
202
11*
90
67
310
120
71
452
60
70
419
13
90
67
310
120
72
452
60
78
205
7
90
82
314
120
87
457
60
80
206
9
90
83
315
120
88
457
30
11**
60
81
206
11*
90
84
315
120
89
458
60
89
424
13
90
85
315
120
90
458
60
94
210
7
90
98
319
120
103
463
60
96
210
9
90
100
320
120
105
464
40
11**
60
98
210
11*
90
102
320
120
107
464
60
107
430
13
90
103
320
120
108
464
60
110
214
7
90
114
325
120
120
470
60
113
215
9
90
117
325
120
123
470
50
11**
60
115
215
11*
90
119
325
120
125
470
60
125
435
13
90
121
325
120
126
470
60
120
219
7
90
134
330
120
141
474
60
125
220
9
90
139
331
120
146
475
60
11**
60
128
220
11*
90
142
332
120
149
476
60
157
444
13
90
143
332
120
150
476
60
131
223
7
90
155
336
120
163
479
60
137
224
9
90
160
337
120
169
480
70
11**
60
141
225
11*
90
164
339
120
172
481
60
189
452
13
90
166
339
120
175
481
60
142
227
7
90
175
342
120
185
484
60
149
229
9
90
182
344
120
192
485
80
11**
60
153
231
11*
90
186
345
120
196
487
60
221
460
345
13
90
189
487
120
199
FULL LOAD COOLING
FIGURE 21A — GW060 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
105
208
9
70
109
213
90
114
217
50
100
196
11
70
104
200
90
109
205
50
13**
50
98
190
13*
70
102
194
90
107
199
50
104
196
15
70
100
191
90
105
196
50
107
244
9
70
119
252
90
125
256
50
103
232
11
70
115
240
90
121
244
60
13**
50
100
226
13*
70
112
233
90
119
237
50
123
237
15
70
111
229
90
117
234
50
108
280
9
70
129
291
90
136
295
50
105
269
11
70
125
279
90
133
283
70
13**
50
102
262
13*
70
123
272
90
130
276
50
142
278
15
70
121
268
90
129
272
50
110
316
9
70
139
329
90
147
333
50
107
305
11
70
136
318
90
144
322
80
13**
50
105
298
13*
70
134
311
90
142
315
50
161
319
15
70
132
306
90
140
310
50
110
360
9
70
142
373
90
156
380
50
108
350
11
70
140
362
90
154
369
90
13**
50
107
342
13*
70
139
355
90
152
361
50
170
362
15
70
137
349
90
151
356
50
111
404
9
70
146
417
90
164
426
50
109
394
11
70
145
406
90
163
415
100
13**
50
108
386
13*
70
144
398
90
162
407
50
178
406
15
70
143
393
90
161
402
50
111
448
9
70
150
460
90
173
472
50
111
438
11
70
149
451
90
172
462
110
13**
50
110
430
13*
70
149
442
90
172
453
50
187
449
15
70
148
437
90
171
449
PART LOAD COOLING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
115
192
9
70
137
200
90
137
200
50
111
184
11
70
133
193
90
133
193
50
13**
50
108
179
13*
70
130
188
90
130
188
50
149
193
15
70
127
184
90
128
184
50
115
226
9
70
142
236
90
149
238
50
112
219
11
70
139
229
90
146
231
60
13**
50
110
214
13*
70
137
224
90
144
226
50
163
229
15
70
136
220
90
143
222
50
116
261
9
70
148
272
90
161
276
50
114
254
11
70
146
264
90
159
269
70
13**
50
113
249
13*
70
145
259
90
158
264
50
176
266
15
70
144
255
90
157
260
50
116
296
9
70
153
307
90
173
315
50
116
288
11
70
153
300
90
172
307
80
13**
50
115
283
13*
70
152
295
90
171
302
50
189
303
15
70
152
291
90
171
298
50
118
340
9
70
156
351
90
181
359
50
118
332
11
70
155
343
90
180
351
90
13**
50
117
327
13*
70
155
338
90
179
346
50
193
345
15
70
155
334
90
179
342
50
120
383
9
70
159
394
90
189
403
50
120
375
11
70
158
386
90
188
395
100
13**
50
119
370
13*
70
157
381
90
187
390
50
196
388
15
70
157
377
90
187
386
50
123
427
9
70
162
437
90
197
448
50
121
419
11
70
161
429
90
196
440
110
13**
50
121
414
13*
70
160
424
90
195
434
50
199
430
15
70
160
420
90
195
430
Manual2100-583A
Page
41 of 48
FULL LOAD HEATING
FIGURE 21B — GW060 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
55
210
9
90
58
322
120
61
467
60
57
211
11
90
59
323
120
62
467
20
13**
60
57
211
13*
90
60
323
120
62
468
60
62
435
15
90
60
323
120
63
468
60
69
216
9
90
73
328
120
76
472
60
71
217
11
90
74
328
120
78
473
30
13**
60
72
217
13*
90
75
329
120
79
473
60
80
441
15
90
76
329
120
80
474
60
83
222
9
90
87
333
120
92
478
60
85
223
11
90
90
334
120
95
478
40
13**
60
87
223
13*
90
91
335
120
96
479
60
97
447
15
90
93
335
120
97
480
60
97
227
9
90
102
339
120
108
483
60
100
228
11
90
105
340
120
111
484
50
13**
60
102
229
13*
90
107
341
120
113
485
60
114
453
15
90
109
341
120
115
485
60
105
232
9
90
119
346
120
127
489
60
107
233
11
90
121
347
120
130
491
60
13**
60
109
234
13*
90
123
347
120
131
491
60
138
462
15
90
124
348
120
133
492
60
113
236
9
90
135
353
120
146
496
60
115
237
11
90
137
354
120
148
497
70
13**
60
116
238
13*
90
138
354
120
150
498
60
162
472
15
90
139
355
120
151
498
60
120
240
9
90
151
359
120
165
502
60
122
242
11
90
153
361
120
167
504
80
13**
60
123
242
13*
90
154
361
120
168
504
60
185
481
362
15
90
155
505
120
169
Manual2100-583A
Page 42 of 48
PART LOAD HEATING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
61
203
9
90
63
309
120
67
452
60
62
203
11
90
64
309
120
68
452
20
13**
60
62
204
13*
90
65
309
120
69
453
60
67
415
15
90
65
309
120
69
453
60
77
207
9
90
80
314
120
84
457
60
78
207
11
90
81
314
120
86
457
30
13**
60
79
208
13*
90
82
315
120
87
458
60
86
422
15
90
83
315
120
87
458
60
92
211
9
90
97
319
120
102
462
60
94
211
11
90
98
320
120
103
462
40
13**
60
96
212
13*
90
100
320
120
105
462
60
105
428
15
90
101
320
120
106
463
60
108
215
9
90
113
324
120
119
466
60
110
215
11
90
115
325
120
121
467
50
13**
60
112
216
13*
90
117
325
120
123
467
60
124
435
15
90
119
326
120
125
468
60
119
218
9
90
133
330
120
139
471
60
121
219
11
90
136
331
120
142
472
60
13**
60
124
219
13*
90
138
331
120
144
473
60
154
444
15
90
140
332
120
146
473
60
129
221
9
90
153
336
120
160
477
60
132
222
11
90
156
337
120
163
478
70
13**
60
135
223
13*
90
158
337
120
165
478
60
184
453
15
90
160
338
120
167
479
60
139
224
9
90
172
342
120
180
482
60
143
226
11
90
176
343
120
184
483
80
13**
60
146
226
13*
90
179
344
120
187
484
60
214
461
344
15
90
181
484
120
188
FULL LOAD COOLING
FIGURE 22A — GW070 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
104
218
11
70
122
231
90
125
232
50
101
211
13
70
120
224
90
123
225
50
16**
50
99
205
15*
70
118
218
90
121
219
50
135
228
17
70
117
215
90
120
216
50
106
255
11
70
129
270
90
137
273
50
104
247
13
70
127
262
90
135
265
60
16**
50
102
241
15*
70
125
256
90
133
259
50
147
266
17
70
124
252
90
132
255
50
108
293
11
70
136
308
90
149
314
50
106
284
13
70
134
300
90
147
306
70
16**
50
104
278
15*
70
132
294
90
145
300
50
159
304
17
70
131
289
90
143
295
50
110
330
11
70
144
347
90
161
355
50
108
321
13
70
142
337
90
159
346
80
16**
50
106
315
15*
70
140
331
90
157
340
50
171
343
17
70
138
326
90
155
335
50
112
374
11
70
144
390
90
162
399
50
110
365
13
70
143
380
90
160
389
90
16**
50
108
359
15*
70
141
374
90
158
383
50
172
385
17
70
139
369
90
157
378
50
113
418
11
70
145
433
90
164
442
50
111
409
13
70
143
423
90
162
432
100
16**
50
110
403
15*
70
142
418
90
160
426
50
172
427
17
70
140
413
90
159
421
50
115
463
11
70
146
476
90
165
485
50
113
453
13
70
144
466
90
164
475
110
16**
50
111
447
15*
70
143
461
90
162
469
50
173
469
456
17
70
142
465
90
161
PART LOAD COOLING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
50
111
200
11
70
140
213
90
150
217
50
109
196
13
70
138
208
90
148
212
50
16**
50
107
193
15*
70
136
206
90
146
209
50
163
216
17
70
134
203
90
144
207
50
113
236
11
70
145
250
90
160
256
50
111
231
13
70
143
245
90
158
250
60
16**
50
110
228
15*
70
141
241
90
156
247
50
171
252
17
70
140
238
90
155
244
50
115
272
11
70
149
286
90
169
295
50
114
267
13
70
148
281
90
168
289
70
16**
50
112
262
15*
70
146
277
90
166
285
50
179
287
17
70
145
273
90
165
282
50
118
308
11
70
154
323
90
179
333
50
116
302
13
70
153
317
90
178
327
80
16**
50
115
297
15*
70
151
312
90
176
322
50
187
323
17
70
150
308
90
175
319
50
119
352
11
70
156
366
90
181
376
50
118
346
13
70
155
360
90
180
370
90
16**
50
116
341
15*
70
154
355
90
178
365
50
190
366
17
70
153
352
90
178
362
50
121
395
11
70
158
409
90
183
419
50
120
389
13
70
157
403
90
182
413
100
16**
50
118
384
15*
70
156
398
90
180
408
50
194
409
17
70
156
395
90
180
405
50
122
439
11
70
161
452
90
184
462
50
121
432
13
70
160
446
90
184
456
110
16**
50
120
427
15*
70
159
441
90
182
451
50
197
452
438
17
70
158
448
90
182
Manual2100-583A
Page
43 of 48
FULL LOAD HEATING
FIGURE 22B — GW070 PRESSURE TABLES
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
54
218
11
90
57
331
120
62
478
60
55
218
13
90
58
332
120
63
478
20
16**
60
56
219
15*
90
60
333
120
64
479
60
64
447
17
90
60
333
120
64
479
60
68
225
11
90
72
338
120
77
485
60
70
226
13
90
74
339
120
79
486
30
16**
60
71
226
15*
90
75
340
120
80
486
60
80
454
17
90
76
340
120
81
487
60
83
232
11
90
88
345
120
93
492
60
85
233
13
90
90
346
120
95
493
40
16**
60
86
234
15*
90
91
347
120
97
494
60
97
461
17
90
92
348
120
98
495
60
97
239
11
90
103
352
120
109
499
60
100
240
13
90
105
353
120
111
501
50
16**
60
102
241
15*
90
107
355
120
113
502
60
114
468
17
90
108
355
120
115
502
60
105
244
11
90
116
358
120
122
504
60
107
245
13
90
118
359
120
124
505
60
16**
60
108
246
15*
90
119
360
120
126
506
60
131
475
17
90
121
361
120
127
507
60
113
249
11
90
129
364
120
135
509
60
114
250
13
90
130
365
120
137
510
70
16**
60
115
251
15*
90
132
366
120
138
511
60
149
481
17
90
133
366
120
139
511
60
120
254
11
90
142
370
120
149
514
60
121
255
13
90
143
371
120
150
515
80
16**
60
122
255
15*
90
144
371
120
151
515
60
166
488
372
17
90
145
515
120
152
Manual2100-583A
Page 44 of 48
PART LOAD HEATING
SOURCE
LOAD
SYSTEMS REFRIGERANT PRESSURES
EWT °F GPM EWT °F GPM Suction PSIG
Discharge PSIG
60
61
207
11
90
64
316
120
68
457
60
62
207
13
90
65
317
120
69
457
20
16**
60
62
208
15*
90
65
317
120
69
458
60
69
427
17
90
66
317
120
70
458
60
76
214
11
90
80
323
120
85
464
60
77
214
13
90
81
323
120
86
465
30
16**
60
78
215
15*
90
82
323
120
87
465
60
87
433
17
90
83
324
120
88
465
60
91
221
11
90
96
329
120
102
471
60
93
221
13
90
98
330
120
103
472
40
16**
60
94
222
15*
90
99
330
120
105
472
60
105
438
17
90
100
330
120
105
473
60
107
228
11
90
112
335
120
118
479
60
109
229
13
90
114
336
120
120
479
50
16**
60
110
229
15*
90
116
336
120
122
480
60
122
444
17
90
117
337
120
123
480
60
117
233
11
90
129
342
120
135
485
60
119
233
13
90
131
343
120
137
486
60
16**
60
121
234
15*
90
133
343
120
139
486
60
146
453
17
90
134
343
120
140
486
60
128
238
11
90
146
350
120
152
492
60
130
238
13
90
149
349
120
154
492
70
16**
60
131
238
15*
90
150
349
120
156
492
60
170
461
17
90
152
350
120
157
493
60
138
243
11
90
164
357
120
169
499
60
140
242
13
90
166
355
120
171
498
80
16**
60
142
243
15*
90
168
356
120
173
499
60
194
470
357
17
90
169
499
120
174
Manual2100-583A
Page
45 of 48
Compressor Will Not Run, No Line
Power at Contactor
Compressor Will Not Run Power at
Contactor
Compressor "Hums" But Will Not
Start
Compressor Cycles on Overload
Thermostat Check Light On, Unit in
Lock-out Mode
Compressor Off on High Pressure
Control (Green Diagnostic Light
Flashing)
Compressor Off on Low Pressure
Control (Orange Diagnostic Light
Flashing)
Compressor Off on Flow Switch
(Red Diagnostic Light Flashing)
Compressor Noisey
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
High Compressor Amps
Excessive Water Usage
Compressor Runs Continuously No Cooling
Liquid Refrigerant Flooding Back to
Compressor
Compressor Runs Continuously No Heating
Reversing Valve Does Not Shift
Liquid Refrigerant Flooding Back to
Compressor
Excessive Operation Costs
Ice in Water Coil
X
X
X
X X
X X
X
X X
X
X
X X X X
X
X
X
x
X X X
X
X
X
X
X
X
X X
X
X
X
X
X
X X
X X
X X X
X
X
X
X
X
X
X
X X X
X
X
X
X X X
X
X X X X
X
X
X
X
X X X
X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X X
X X
X
X
X
X
X
X
X
X
X X X
X
X
X
X
X X
X
Source Water Coil
MAIN SYSTEM ISSUES
Rev.Valve
X X
X
X
X
X
X
X X
X
X X X X
X X X
X
X
X X
Refrigerant System
X X X
X
X
X X
Compressor
X X
X X X X X X X X X
Low Voltage
POWER SUPPLY - CONTROL SYSTEM ISSUE
Line Voltage
X X X X
Power Failure
Blown Fuse or Tripped Breaker
Faulty Wiring
Loose Terminals
Low Voltage
Defective Contacts in Contactor
Faulty Wiring
Time Delay + Random Start Sequence Not Timed Out
Loose Terminals
Control Tranformer (has circuit breaker)
Voltage (Transformer has 208 & 240V Taps & Geothermal
Logic Control has over/under voltage protection)
Thermostat
Contactor Coil
High Pressure Trip (Green Diagnostic Light)
Low Pressure Trip (Orange Diagnostic Light)
Flow Switch Trip (Red Diagnostic Light)
Bad Compressor Capacitor
Compressor Internal Thermal Overload Open
Bearings Defective
Seized
Busted Internal Scroll
Motor Winding Defective
Refrigerant Charge Low
Refrigerant Overcharge
High Head Pressure
Low Head Pressure
High Suction Pressure
Low Suction Pressure
Non-Condensables
Faulty Expansion Valve
Leaking/By-Passing
Partially Shifting
Defective Valve or Coil
Scaled or Plugged Coil (Htg.)
Scaled or Plugged Coil (Clg.)
Water Volume Low (Htg.)
Water Volume High (Htg.)
Water Volume Low (Clg.)
Water Volume High (Clg.)
High Water Temperature (Clg.)
High Water Temperature (Htg.)
Low Water Temperature (Clg.)
X
X
X
X
X
X
X
X
X
X X
X
X
X
X X
X
X
X
X
X X
X
X
X
X
X
X
X
X X
X
X
X
Load Water Coil
X X X
X X
Low Water Termperature (Htg.)
Scaled or Plugged Coil (Htg.)
Scaled or Plugged Coil (Clg.)
Water Volume Low (Htg.)
Water Volume High (Htg.)
Water Volume Low (Clg.)
Water Volume High (Clg.)
High Water Temperature (Clg.)
High Water Temperature (Htg.)
Low Water Temperature (Clg.)
X
X
X
X X X
X X
X
X X
X
X X X X
X
X X
X
X
X X X X
X
X
X
X X
X
X X X X
X
X X
Water System
EXT. SYSTEM ISSUES
X X
Low Water Termperature (Htg.)
Solenoid Valve Stuck Closed (Htg.)
Solenoid Valve Stuck Closed (Clg.)
Solenoid Valve Stuck Open (Htg. or Clg.)
Source Water Pump Faltering (Htg.)
Source Water Pump Faltering (Clg.)
Load Water Pump Faltering (Htg.)
Load Water Pump Faltering (Clg.)
TROUBLESHOOTING
SERVICE
SERVICE HINTS
COMPRESSOR SOLENOID
Check all power fuses or circuit breakers to ensure that
they are all the correct rating.
See Sequence of Operation on Pages 28 & 29 for function.
UNBRAZING SYSTEM COMPONENTS
If the refrigerant charge is removed from a scroll equipped
unit by bleeding the high side only, it is sometimes
possible for the scrolls to seal, preventing pressure
equalization through the compressor. This may leave
low side shell and suction line tubing pressurized. If the
brazing torch is then applied to the low side while the low
side shell and suction line contain pressure, the pressurized
refrigerant and oil mixture could ignite when it escapes
and contacts the brazing flame. To prevent this occurence,
it is important to check both the high and low side
system pressures with manifold gauges before unbrazing.
Removal of service port cores is highly recommended
as secondary insurance that all system pressure has been
relieved.
BOTH HIGH & LOW SIDE OF HIGH AND LOW SIDE OF
THE SCROLL COMPRESSOR MUST BE CHECKED WITH
MANIFOLD GAUGES BEFORE UNBRAZING SYSTEM
COMPONENTS. FAILURE TO DO SO COULD CAUSE
PRESSURIZED REFRIGERANT AND OIL MIXTURE TO IGNITE
IF IT ESCAPES AND CONTACTS THE BRAZING FLAME
CAUSING PROPERTY DAMAGE, BODILY HARM, OR DEATH.
Manual2100-583A
Page 46 of 48
A nominal 24-volt direct current coil activates the internal
compressor solenoid. The input control circuit voltage
must be 18 to 28 volts ac. The coil power requirements
is 5 VA. The external electrical connection is made with
a molded plug assembly. This plug contains a full wave
rectifier to supply direct current (dc volts) to the unloader
coil.
COMPRESSOR SOLENOID TEST PROCEDURE
– If it is suspected that the unloader is not working, the
following methods may be used to verify operation.
1. Operate the system and measure compressor
amperage. Cycle the compressor solenoid on
and off at 10-second intervals. The compressor
amperage should go up or down at least 25 percent.
2. If Step #1 does not give the expected results, shut
unit off. Apply 18 to 28 volts ac to the solenoid
molded plug leads and listen for a click as the
solenoid pulls in. Remove power and listen for
another click as the solenoid returns to its original
position.
3. If “clicks” cannot be heard, shut off power and
remove the control circuit molded plug from
the compressor and measure the solenoid coil
resistance. The resistance should be 32 to 60 ohms
depending on compressor temperature.
4. Next, check the molded plug:
Voltage Check: Apply control voltage to the
plug wires (18 to 28 volts ac). The measured
dc voltage at the female connectors in the plug
should be around 15 to 27 volt dc.
Resistance Check: Measure the resistance from
the end of the one molded plug lead to either of
the two female connectors in the plug. One of the
connectors should read close to zero ohms, while
the other should read infinity. Repeat with other
wire. The same female connector as before should
read zero, while the other connector again reads
infinity. Reverse polarity on the ohmmeter leads
and repeat. The female connector that read infinity
previously should now read close to zero ohms.
Replace plug if either of these test methods does
not show the desired results.
GROUND SOURCE HEAT PUMP
PERFORMANCE REPORT
DATE
TAKEN BY:
1. Unit Manufacturer ________________
Model No. ________________
Thermostat Manufacturer __________________
Serial No. _________________
Model No. _________________
2. Company Reporting _______________________________________________________________________
3. Installed by ___________________________________________________ Date Installed ____________________
4. User's (Owner's) Name ___________________________________________________________________________
Address________________________________________________________________________________________
________________________________________________________________________________________
5. Unit location ___________________________________________________________________________________
WATER SYSTEM INFORMATION
6. Open Loop System (Water Well) _____________ Closed Loop System ________________
A. If Open Loop, where is water discharged ?____________________________________________________
7. The following questions are for Closed Loop systems only!
A. Closed Loop system designed by: ______________________________________________________
B. Type of Antifreeze used __________________________________ % Solution __________________
C. System Type:
Series __________________ Paralled ____________________
D. Pipe Material ____________________________ Nominal Size ______________________________
E. Pipe Installed:
1. Horizontal _____________________ Total Length of Pipe _________________ ft.
No. Pipe in Trench ________________ Depth bottom pipe ___________________ ft.
2. Vertical _______________________ Total depth of bore hole _______________ ft.
Manual2100-583A
Page
47 of 48
THE FOLLOWING INFORMATION IS NEEDED
TO CHECK PERFORMANCE OF UNIT.
*Cooling
LOOP SIDE DATA
8. Entering fluid temperature
9. Entering fluid pressure
10. Leaving fluid temperature
11. Leaving fluid temperature
12. Pressure drop through coil
13. Gallons per minutes through water coil
14. Fluid temperature rise
15. Discharge Pressure
16. Suction Line Pressure
17. Voltage at Compressor (unit running)
18. Amperage draw at line side of contactor
19. Amperage draw of compressor common wire
20. Suction line temperature 6" from compressor
21. Superheat at compressor
22. Liquid line temperature at metering device
23. Coil subcooling
LOAD SIDE DATA
24. Entering fluid temperature
25. Entering fluid pressure
26. Leaving fluid temperature
27. Leaving fluid temperature
28. Pressure drop through coil
29. Gallons per minutes through water coil
30. Fluid temperature rise
31. Other information about installation
* Make sure the desuperheater is de-activated if installed.
Manual2100-583A
Page 48 of 48
* Heating
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