ClimateMaster Ultra Classic VT 072 Guide
TABLE OF CONTENTS
Ultra Classic (VT) Series
Residential Vertical
Two-Stage Geothermal
Heat Pumps
Installation, Operation &
Maintenance Instructions
69197343
Revision: 07/07/05D
ECM Fan Control 14
ECM Blower Data 16
Electrical - Low Voltage 16
Freeze Protection Selection 16
Water Valve Wiring 17
Thermostat Wiring 17
Electrical Wiring Schematic 18
CXM Control Description 19
Troubleshooting Information 22
Troubleshooting Analysis 23
Major Replacement Components 24
Unit Start-Up Procedure 26
Operating Limits 26
Pressure Drop Table 28
Operating Pressures 28
Warranty 31
Preventive Maintenance BC
Model Nomenclature 2
Storage 2
Pre-Installation 3
Physical Data 3
Physical Dimensions 4
Unit Installation 5
Duct System 5
Water Connections 6
Condensate Drain 6
Ground Loop Application 7
Flushing 7
Antifreeze 8
Open Loop/Well Water Installation 9
Water Quality Standards 10
Hybrid Loop/Well Applications 10
Hot Water Generator 11
Electrical - Line Voltage 13
Electrical Data 13
Page 2 Ultra Classic (VT) Series
GENERAL INFORMATION
Storage
CAUTION: DO NOT store or install units in
corrosive environments or in locations subject to
temperature or humidity extremes (e.g., attics,
garages, rooftops, etc.). Corrosive conditions and
high temperature or humidity can significantly
reduce performance, reliability, and service life.
Always move units in an upright position. Tilting
units on their sides may cause equipment damage.
Equipment should be stored in its shipping carton in a
clean, dry area. Store units in an upright position at all
times. Stack vertical units a maximum of 2 units high. DO
NOT remove equipment from shipping cartons until
equipment is required for installation.
Unit Protection
Cover units on the job site with either shipping cartons,
vinyl film, or an equivalent protective covering. Cap the
open ends of pipes stored on the job site. In areas where
painting, plastering, or spraying has not been completed,
all due precautions must be taken to avoid physical
damage to the units and contamination by foreign material.
Physical damage and contamination may prevent proper
start-up and may result in costly equipment cleanup.
Examine all pipes, fittings, and valves before installing
any of the system components. Remove any dirt or trash
found in or on these components.
Inspection
Upon receipt of the equipment, carefully check the
shipment against the bill of lading. Make sure all units
have been received. Inspect the carton or crating of
each unit, and inspect each unit for damage. Assure
the carrier makes proper notation of any shortages or
damage on all copies of the freight bill and he completes
a common carrier inspection report. Concealed damage
not discovered during unloading must be reported to the
carrier within 15 days of receipt of shipment. If not filed
within 15 days, the freight company can deny the claim
without recourse. Note: It is the responsibility of the
purchaser to file all necessary claims with the carrier.
Notify the ClimateMaster Customer Service of all damage
within fifteen (15) days of shipment.
Introduction
ClimateMaster UltraClassic Geothermal Heat Pump units
are typically installed in a floor level closet, basement,
or in a small mechanical room. The installation site
chosen for these units must allow adequate clearance for
maintenance and servicing of the unit without its removal
from the installation location.
Model Nomenclature
CONTROLS:
048
G = 208V, 230V/1PH/60Hz
060
072
SSS = CXM w/ECM
VT = ULTRA CLASSIC VERTICAL
VOLTAGE:
SIZE:
042
036
SERIES:
V
1
T
2
0
3
3
4
G
6
6
5
S
7
S
8
S
9
D = RESIDENTIAL CLASS
LT = LEFT RETURN, TOP DISCHARGE
REVISION CODE:
AIR FLOW CONFIGURATION:
HEAT EXCHANGER OPTIONS:
D
121 0
L T
11 1 3
A S
1 4
CABINET:
J
15
J = CURRENT REVISION SIZE 036
H = CURRENT REVISION SIZES 042-072
B = COPPER WATER COIL,
W/HOT WATER GENERATOR, E-COATED AIR COIL
A = COPPER WATER COIL, E-COATED AIR COIL
J = CUPRO-NICKEL WATER COIL, E-COATED AIR COIL
K = CUPRO-NICKEL WATER COIL,
W/HOT WATER GENERATOR, E-COATED AIR COIL
S = STANDARD
RT = RIGHT RETURN, TOP DISCHARGE
Rev.: 04/15/04D
Ultra Classic (VT) Series Page 3
To avoid equipment damage, DO NOT use these
units as a source of heating or cooling during the
construction process. The mechanical components
and filters used in these units will quickly become
clogged with construction dirt and debris which
may cause system damage.
To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit
must be serviced only by technicians who meet
local, state and federal proficiency requirements.
All refrigerant discharged from this unit must be
recovered WITHOUT EXCEPTION. Technicians
must follow industry accepted guidelines and all
local, state and federal statutes for the recovery
and disposal of refrigerants.
If a compressor is removed from this unit,
system refrigerant circuit oil will remain in the
compressor. To avoid leakage of compressor oil,
the refrigerant lines of the compressor must be
sealed after it is removed.
The installation of geothermal heat pump units and all
associated components, parts and accessories which
make up the installation shall be in accordance with
the regulations of ALL authorities having jurisdiction
and MUST conform to all applicable codes. It is the
responsibility of the Installing Contractor to determine and
comply with ALL applicable codes and regulations.
Pre-Installation
Installation, operation and maintenance instructions
are provided with each unit. Before unit start-up, read
all manuals and become familiar with the unit and its
operation. Thoroughly check the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate
with ordering and shipping information to verify the
correct unit has been shipped.
2. Keep the cabinet covered with the shipping carton
until installation is complete and all plastering,
painting, etc., is finished.
3. Verify refrigerant tubing is free of kinks or dents and
that it does not touch other unit components.
4. Inspect all electrical connections. Connections must
be clean and tight at the terminals.
Remove Fan Motor shipping bracket in rear of
Air Handler compartment.
Table 1: Physical Data
VT Physical Data
MODEL 036 042 048 060 072
Fan Wheel (Dia. X Width), in. 9 X 7
Fan Motor & HP ECM - 1/2 ECM - 1/2 ECM - 1
No. Refrigerant Circuits 2 2 2 2 2
Compressors 2 - Rotary
No. Coaxial Heat Exchangers 2 2 2 2 2
R - 22 Charge (Sys A / Sys B), oz 40 / 40 57 / 59 62 / 62 54 / 54 58 / 58
Water Connection Size (fpt swivel) 1" 1" 1" 1" 1"
Air Coil Length x Height, in. 20 X 24 24 X 24 24 X 32 24 X 36 24 X 36
Filter - 1" ElectroStatic (Std.) 24 x 24 27 x 31 27 x 31 27 x 35 27 x 35
Weight - Operating (lbs.) 225 275 305 385 450
Weight - Packaged (lbs.) 235 285 315 395 460
Rev.: 8/07/04D
All units have txv expansion devices, 20 ga sheet metal,
and 7/8" & 1-1/8" electrical knockouts.
All units have dual 1" Swivel water connections (4 total)
HWG utilizes 1/2" fpt water connections and is available only on circuit A.
All units have 3/4" fpt condensate drain connections.
Revision Date
Data from Tom North 9/00 10/30/00
Changed filter rack and filter data checked with Enertech 11/13/00
Changes for new comp in 036, 060, and 072 and Electrost Filter & Rack Std 3/30/01
2 - Scroll
11 X 10 11 X 10
ECM - 1
2 - Scroll
Removed Air Coil Data 8/07/04
GENERAL INFORMATION
Page 4 Ultra Classic (VT) Series
Physical Dimensions
INSTALLATION
±
±
Ultra Classic (VT) Series Page 5
General Unit Location
Locate the unit in an indoor area that allows easy removal
of the filter and access panels, and has enough space
for service personnel to perform maintenance or repair.
Provide sufficient room to make water, electrical and duct
connection(s). If the unit is located in a confined space,
such as a closet, provisions must be made for return air to
freely enter the space by means of a louvered door, etc.
Any access panel screws that would be difficult to remove
after the unit is installed should be removed prior to
setting the unit. These units are not approved for outdoor
installation and, therefore, must be installed inside the
structure being conditioned. Do not locate in areas where
ambient conditions are not maintained with 40-100°F and
up to 75% relative humidity.
Vertical Units Location and Access
Vertical Units are typically installed in a floor level
closet, basement, or in a small mechanical room. Install
units with adequate clearance to allow maintenance and
servicing. Conform to the following guidelines when
selecting unit location:
1. Provide adequate clearance for filter replacement and
drain pan cleaning. Do not block filter access with
piping, conduit or other materials. Refer to the unit
catalog for Vertical Unit Dimensions.
2. Provide access for fan and fan motor maintenance
and for servicing the compressor and coils without
removing the unit. Note: UltraClassic compressor
and refrigerant circuit service requires that left
side access be provided.
3. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be sufficient
to allow removal of the unit, if necessary.
4. Provide access to water valves and fittings and
screwdriver access to the unit side panels, discharge
collar and all electrical connections.
Setting Vertical Units
Vertical units are available in left or right air return
configurations. Vertical units should be mounted level on
a vibration absorbing pad or extruded polystyrene slightly
larger than the base to provide isolation between the unit
and the floor. It is not necessary to anchor the unit to the
floor (see Figure 1a).
Duct System
A field installed air outlet bracket is provided on vertical
units to facilitate duct connection. A flexible connector
is recommended for both discharge and return air duct
connections on metal duct systems. Uninsulated duct
should be insulated with a minimum of one-inch duct
insulation. Application of the unit to uninsulated ductwork
in an unconditioned space is not recommended as the
unit’s performance will be adversely affected.
INSTALLATION
Figure 1a: Vertical unit mounting
If the unit is connected to existing ductwork, a previous
check should have been made to assure the ducts have the
capacity to handle the air required for the unit. If ducting
is too small, as in the replacement of heating only systems,
larger ductwork should be installed. All existing ductwork
should be checked for leaks and repaired as necessary.
The duct system should be sized to handle the design
airflow quietly. To maximize sound attenuation of the unit
blower, the supply and return plenums should include
internal duct liner of glass fiber or be of ductboard
construction for the first few feet. If air noise or excessive
air flow is a problem, the airflow can be changed. See the
Blower Performance and Fan Speed sections for further
instruction (See Page 14).
Air Coil
To obtain maximum performance, the air coil should be
cleaned before start-up. A 10% solution of dishwasher
detergent and water is recommended for both sides of
coil, a thorough water rinse should follow.
Water Connections
The UltraClassic Heat Exchanger water connections are
swivel piping fittings that accept a 1" Male Pipe Thread
(MPT) connector. The swivel connector has a rubber
gasket seal similar to a garden hose gasket, which when
mated to the flush end of any 1" threaded pipe provides a
leak-free seal without the need for thread sealing tape or
compound. Check to insure that the rubber seal is in the
swivel connector prior to attempting any connection.
(The
rubber seals are shipped attached the swivel connector.)
DO
NOT OVERTIGHTEN or leaks may occur.
Never use flexible hoses smaller than 1" inside diameter
on the unit and limit hose length to 10 ft. per connection.
Check carefully for water leaks. Figure 3 shows a
manifold being used in an earth loop application. Flow
(pressure drop) and temperature measurements in the
configuration will represent the total flow going through
both coaxes regardless of which refrigerant circuits are
active. Figure 4 illustrates a well system using individual
connections. Flow and temperature measurements will
represent each refrigerant circuit.
Air Pad or extruded
polystyrene
Page 6 Ultra Classic (VT) Series
Condensate Drain
Each unit utilizes a condensate hose inside the cabinet as
a trapping loop, therefore an external trap is not necessary.
Figure 5 shows typical condensate connections.
Each unit must be installed with means to flush or
blowout the condensate drain line. Do not install units
with a common trap and/or vent.
Install a vent in the condensate line of any application
which may allow dirt or air to collect in the line. Always
vent when the application requires a long, horizontal
To make the connection to a ground loop system, mate
the brass loop connection against the rubber gasket in
the swivel connector, and thread the female locking
ring onto the pipe threads, while maintaining the brass
connector in the desired direction (see Figure 2). Tighten
the connectors by hand to provide a leak proof joint.
When connecting to an open loop (ground water) system,
thread any 1" MPT fitting (PVC or copper) into the swivel
connector and tighten in the same manner as noted above.
The open and closed loop piping system must include
pressure/temperature taps for serviceability.
run. When some sagging in the condensate line may be
anticipated (as in a long line of plastic pipe) or when
“double trapping” may occur. Also vent when large units
are working against higher external static pressure that
other units connected to the same condensate main since
this may cause poor drainage for all units on the line.
Figure 4: Well Piping using a individual connections
Figure 5: Typical drain connection
Figure 3: Loop Piping using a manifold
P/T Plugs
Optional
Accessory
Manifold
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate supply
duct for first 4’ each way
to reduce noise
Internally insulate return
transition duct to reduce
noise
Rounded return
transition
Rev.: 11/2/00
Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate supply
duct for first 4’ [1.2m] each
way to reduce noise
Internally insulate return
transition duct to reduce
noise
Rounded return
transition
Rev 3/27/00
INSTALLATION
Figure 2: The Female Locking Ring is threaded onto
the pipe threads which holds the male pipe end against
the gasket, and seals the joint. HAND TIGHTEN
ONLY! DO NOT OVERTIGHTEN!
Ultra Classic (VT) Series Page 7
Type Minimum Temperature for Freeze Protection
10°F 15°F 20°F 25°F
Methanol 25% 21% 16% 10%
100% USP food grade Propylene Glycol 38% 30% 22% 15%
GROUND LOOP APPLICATION
Piping Installation
The typical closed loop ground source system is shown
in Figure 10. All earth loop piping materials should be
limited to only polyethylene fusion in inground sections
of the loop and galvanized or steel fitting should not be
used at any time due to their tendency to corrode. All
plastic to metal threaded fittings should be avoided as well
due to their potential to leak in earth coupled applications
and a flanged fitting substituted. P/T plugs should be used
so that flow can be measured using the pressure drop of
the unit heat exchanger in lieu of other flow measurement
means. Earth loop temperatures can range between
25-110°F and 2.25 to 3 gpm of flow per ton of cooling
capacity is recommended in these applications. Upon
completion of the ground loop piping, pressure test the
loop to assure a leak free system.
Horizontal Systems: Test individual loops as installed.
Test entire system when all loops are assembled.
Vertical U-Bends and Pool Loop Systems: Test Vertical U-
bends and pond loop assemblies prior to installation with
a test pressure of at least 100 psi.
Flushing the Earth Loop
Once piping is completed between the unit, flow center
and the ground loop (Figure 10), final purging and
charging of the loop is needed. A flush cart (at least a 1.5
hp pump) is needed to achieve adequate flow velocity
in the loop to purge air and dirt particles from the loop
itself. Antifreeze solution is used in most areas to prevent
freezing. All air and debris must be removed from the
earth loop piping system before operation. Flush the loop
with a high volume of water at a high velocity (2 fps
in all piping), both directions. The steps below must be
followed for proper flushing. Fill loop with water from
a garden hose through flush cart before using flush cart
pump to ensure an even fill. Once full, do not allow the
water level in the flush cart tank to drop below the pump
inlet line or air can be pumped back out to the earth
loop. Try to maintain a fluid level in the tank above the
return tee so that air can not be continuously mixed back
into the fluid. 50 psi surges can be used to help purge
air pockets by simply shutting off the return valve going
into the flush cart reservoir. This "dead heads" the pump
to 50 psi. To purge, dead head the pump until maximum
pumping pressure is reached. Open the return valve and a
pressure surge will be sent through the loop to help purge
air pockets from the piping system. Notice the drop in
fluid level in the flush cart tank. Note: If air is purged
from the system, the level will drop only 1-2 inches in
a 10" diameter PVC flush tank (about a half gallon)
since liquids are incompressible. If the level drops
more than this, flushing should continue since air is still
being compressed in the loop fluid. Do this "dead head"
procedure a number of times.
When the fluid level is dropping less than 1-2" in a 10"
diameter tank the flow can be reversed. Finally the dead
head test should be checked again for an indication of
air in the loop. Note: This fluid level drop is your only
indication of air in the loop.
Pipe Size Volume
Copper 1" 4.1
1.25" 6.4
1.5" 9.2
Rubber Hose 1" 3.9
3/4" IPS SDR11 2.8
1" IPS SDR11 4.5
1 1/4" IPS SDR11 8.0
Polyethylene 1 1/2" IPS SDR11 10.9
2" IPS SDR11 18.0
1 1/4" IPS SCH40 8.3
1 1/2" IPS SCH40 10.9
2" IPS SCH40 17.0
Unit Heat Exchanger Typical 1.0
Flush Cart Tank 10" diam x 3 ft 10.0
Table 2: Approximate Fluid Volume (gal.) per 100' of Pipe
Table 3: Antifreeze Percentages by Volume
Page 8 Ultra Classic (VT) Series
Antifreeze may be added before, during or after the
flushing procedure. However, depending upon which time
is chosen, antifreeze could be wasted when emptying the
flush cart tank. See antifreeze section for more details.
Loop static pressure will fluctuate with the seasons.
Pressures will be higher in the winter months than during
the cooling season. This fluctuation is normal and should
be considered when charging the system initially. Run the
unit in either heating or cooling for a number of minutes
to condition the loop to a homogenous temperature. This
is a good time for tool cleanup, piping insulation etc. Then
final flush and pressurize the loop to a static pressure of
40-50 psi (winter) 15-20 psi (summer).
After pressurization, be sure to remove the plug in the end
of the Grundfos loop pump motor(s) to allow trapped air
to be discharged and to insure the motor housing has been
flooded. This is not required for Taco circulators. Insure
the loop flow center provides adequate flow through the
unit by checking pressure drop across the heat exchanger
and comparing it to the figures shown in Table 12.
Antifreeze
In areas where minimum entering loop temperatures
drop below 40°F or where piping will be routed through
areas subject to freezing, anti-freeze is needed. Alcohols
and glycols are commonly used as antifreezes, however
your local territory manager should be consulted for the
antifreeze best suited to your area. Freeze protection
should be maintained to 15°F below the lowest expected
entering loop temperature. For example, if 30°F is the
minimum expected entering loop temperature, the leaving
loop temperature would be 25-22°F and freeze protection
should be at 15°F (30°F-15°F=15°F). All alcohols should
be premixed and pumped from a reservoir outside of the
building when possible or introduced under water level
to prevent fuming. Initially calculate the total volume
of fluid in the piping system using Table 2. Then use the
percentage by volume shown in Table 3 for the amount
of antifreeze. Antifreeze concentration should be checked
from a well mixed sample using a hydrometer to measure
specific gravity. See Flow Controller IOM for more
information.
Freeze Protection Setting
CXM or DXM Control:
When an antifreeze is selected, the FP1 jumper (JW3)
should be clipped to select the low temperature
(Antifreeze 10°F) setpoint to avoid nuisance faults. See
Freeze Protection Selection. Valves should be included
in case of servicing. Boiler drains or other valves should
be "tee’d" in the line to allow acid flushing of just the
heat exchanger. Pressure temperature plugs should be
used so that flow and temperature can be measured. The
water freezestat should be wired. Piping materials should
be limited to PVC SCH80 or copper. Note: Due to the
pressure and temperature extremes, PVC SCH40 is
not recommended.
Figure 10: Typical Closed Loop System.
GROUND LOOP APPLICATION
Ultra Classic (VT) Series Page 9
Water Quality
Water quality should be plentiful and of good quality.
Table 4 shows recommended water quality guidelines.
The unit can be ordered with either a copper or cupro-
nickel water heat exchanger. Copper is recommended for
closed loop systems and open loop ground water systems
that are not high in mineral content or corrosiveness.
In conditions anticipating heavy scale formation or
in brackish water, a cupro-nickel heat exchanger is
recommended. In ground water situations where scaling
could be heavy or where biological growth such as
iron bacteria will be present, a closed loop system is
recommended. Heat exchanger coils may over time
lose heat exchange capabilities due to a build up of
mineral deposits inside. These can be cleaned only by a
qualified service mechanic as acid and special pumping
equipment are required. Note: Desuperheater coils can
likewise become scaled and possibly plugged. In areas
with extremely hard water, the home owner should
be informed that the heat exchanger may require
occasional acid flushing.
Expansion Tank
Use a closed, bladder-type expansion tank to minimize
mineral formation due to air exposure. The expansion
tank should be sized to handle at least one minute run
time of the pump to prevent premature pump failure using
its drawdown capacity rating. The pump should be sized
to the home’s domestic water load (5-9 gpm) plus the
heat pump water load. Discharge water from the unit is
not contaminated in any manner and can be disposed of
in various ways, depending on local building codes, i.e.
recharge well, storm sewer, drain field, adjacent stream
or pond, etc. Most local codes forbid the use of sanitary
sewer for disposal. Consult your local building and zoning
department to assure compliance in your area.
OPEN LOOP - WELL WATER SYSTEMS
Water Control Valve
Note the placement of the water control valve. Always
maintain water pressure in the heat exchanger by placing
water control valves at the outlet of the unit to prevent
mineral precipitation. Pilot operated slow closing valve’s
solenoid valves are recommended to reduce water
hammer. If water hammer persists, a mini-expansion tank
can be mounted on the piping to help absorb the excess
hammer shock. Insure that the total "VA" draw of the
valve can be supplied by the unit transformer. For instance
the slow closing valve can draw up to 35VA. This can
overload smaller 40 or 50 VA transformers depending
on the other controls employed. A typical pilot operated
solenoid valve draws approximately 15VA. Note the wiring
diagram in Figure 20.
Flow Regulation
Flow regulation can be accomplished by two methods.
Most water control valves have a flow adjustment built
in. By measuring the pressure drop through the unit heat
exchanger flow rate can be determined and compared
to Table 9. Since the pressure is constantly varying two
pressure gauges might be needed. Simply adjust the
water control valve until the desired flow of 1.5 to 2 gpm
per ton is achieved. Secondly a flow control device may
be installed. The devices are typically an orifice that is
designed to allow a specified flow rate. These are mounted
on the outlet of the water control valve. On occasion these
valves can produce a velocity noise that can be reduced
by applying some back pressure. This is accomplished
by slightly closing the leaving isolation valve of the well
water setup.
Freeze Protection Setting
CXM or DXM Control:
When well water is used, the FP1 jumper (JW3) should
NOT be clipped, but should be left in the factory position
of water setting (30°F). See Freeze Protection Selection.
Figure 11: Typical Well Water/Open Loop System
Page 10 Ultra Classic (VT) Series
HYBRID GROUND LOOP/WELL WATER SYSTEMS
The UltraClassic dual refrigerant circuits with individual
water connections for each, allows each refrigerant
circuit to utilize a different ground source and benefit
from a dramatically shortened earth loop as illustrated in
Figure 12. For instance a 4 ton unit can utilize a 2.5 ton
earth loop on circuit 1 and well or city water on circuit 2.
The earth loop is used as first stage with the well or city
water source used as the second circuit. Using the well
as second stage greatly reduces the amount of earth loop
required and limits the well or city water usage.
Note: City water rates should be examined for feasibility
before installation. City water should not be used as a
source in areas where water temperatures fall below
45°F. ClimateMaster should be consulted when sizing
earth loops for this application because of the increased
runtime on the earthloop. Traditional loop sizing will
be inadequate and can result in poor performance and
possibly complete failure of the system.
Pete's plugs should be installed on both systems to
facilitate servicing. Standard water flows can be utilized
on each circuit 2.25 - 3 gpm /ton for earth loops and 1.5-
2 per ton well/city water. Each circuit should have the
appropriate freezestat setting. Be sure circuit A is Earth
Loop and circuit B is Well setting or City. The Ground
Loop and Well System sections should be consulted for
further details.
Figure 12: Typical Hybrid Loop/Well system
Table 4: Water Quality Standards
Ultra Classic (VT) Series Page 11
Shut-off Valve with Waste
Vent at high point
Cold Inlet
Hot Outlet
to home
Insulated water lines -
5/8” OD 50 ft maximum
Powered
Water
Heater
Upper
element to
120 - 130°F
Lower
element to
100-110°F
Domestic
Cold Supply
Tee and drain
Shut-off Valve
HOT WATER GENERATOR
The HWG (Hot Water Generator) or desuperheater option
provides considerable operating cost savings by utilizing
excess heat energy from the heat pump to help satisfy
domestic hot water requirements. The HWG is active
throughout the year, providing virtually free hot water
when the heat pump operates in the cooling mode or hot
water at the COP of the heat pump during operation in the
heating mode. Actual HWG water heating capacities are
provided in the appropriate heat pump performance data.
All Climate Master heat pumps equipped with the
HWG option include a built-in water to refrigerant heat
exchanger to eliminate the need to open and tie into the
heat pump’s refrigerant circuit in the field. The control
circuit is also built in. The concentric fitting is optional.
Figure 14 is a typical example of HWG water piping
connections on an UltraClassic unit with a built-in pump.
Using a concentric or coaxial hot water tank connection
fitting eliminates the need to tie into the hot water tank
cold water piping. (see Figure 16)
Typically a single tank of at least 52 gallons is used
to limit installation costs and space. However, a dual
tank, as shown in Figure 15, is the most efficient system
providing the maximum storage and temperate source
water to the desuperheater. Using a concentric hot water
tank connection fitting eliminates the need to tie into
the hot water tank water piping. In high liming areas
(hardness>100ppm or 6 grains per gallon) the alternative
piping scheme in Figure 16 may be used to eliminate the
possible scaling of the smaller cross-sectioned area of
the concentric fitting. It is always advisable to use water
softening equipment on domestic well water systems
to reduce the liming potential and lengthen equipment
life. In extreme water conditions, it may be wise to not
use the HWG option since the probable cost of frequent
maintenance may offset or exceed any savings.
Installation
The HWG aquastat is set at 125 °F and is located on the
HWG heat exchanger “Water In” line. If the HWG is
connected incorrectly or if circulation is reversed, the
aquastat will sense leaving water temperature and prevent
HWG operation. UNDER NO CIRCUMSTANCES
DISCONNECT OR REMOVE THE HWG AQUASTAT!
Full load conditions could drive hot water tank
temperatures far above desirable temperature levels if the
aquastat has been disconnected or removed.
The heat pump, water piping, pump, and hot water tank
should be located where the ambient temperature does not
fall below 50 °F. Keep water piping lengths at a minimum
– DO NOT use a one way length greater than 50 feet.
All installations must be made in accordance with local
codes. The installer is responsible for knowing the local
requirements, and for performing the installation accordingly.
Figure 14: Typical UltraClassic HWG Installation
Page 12 Ultra Classic (VT) Series
Water Tank Preparation
1. Turn off power or fuel supply to the hot water tank.
2. Connect a hose to the drain valve on the water tank.
3. Shut off the cold water supply to the water tank.
4. Open the drain valve and open the pressure relief
valve or a hot water faucet to drain tank.
5. In an existing tank, once drained the tank should be
flushed with cold water until the water leaving the
drain hose is clear and free of sediment.
6. Close all valves and remove the drain hose.
7. Install HWG water piping.
HWG Water Piping
1. Using at least 5/8" O.D. copper, route and install the
water piping, valves and air vent as shown in Figures
14, 15, or 16. When used, the air vent MUST be at
the high point of the HWG water piping.
2. Insulate all HWG water piping with no less than 3/8"
wall closed cell installation.
3. Open both shut off valves and make sure the tank
drain valve is closed.
Water Tank Refill
1. Open the cold water supply to the tank.
2. Open a hot water faucet to vent air from the system
until water flows from the faucet, then close.
3. Depress the hot water tank pressure relief valve
handle to ensure there is no air remaining in the tank.
4. Inspect all work for leaks.
5. Before restoring the power or fuel supply to the water
heater, adjust the temperature setting on the tank
theremostat(s) to ensure maximum utilization of the
heat available from the refrigeration system and con-
serve the most energy. On tanks with both upper and
lower elements and thermostats, the lower element
should be turned down to 100°F or lowest setting,
while the upper element should be adjusted to 120°F.
Depending upon the specific needs of the customer,
you may want to adjust the upper element differently.
On tanks with a single thermostat, lower the thermo-
stat setting to 120°F or the “LOW” position.
6.
Replace access cover(s) and restore power or fuel supply.
Initial Start-Up
1. Make sure all valves in the HWG water circuit are
full open.
2.
Turn on the heat pump and allow it to run for 10-15 minutes.
3. Turn the heat pump and heat pump power supply
“OFF” and CONNECT POWER TO THE HWG
PUMP as shown in Figure 17. On units with the inter-
nally mounted pump, connect the pump power lead
as instructed on the lead tag.
4. The HWG pump should not run if the compressor is
not running.
5. The temperature difference between the water enter-
ing and leaving the HWG coil should be approxi-
mately 10°F.
6. Allow the unit to operate for 20 to 30 minutes to
ensure it is functioning properly.
Shut Off Valves with Waste
Vent at high point
Insulated water lines - 5/8” OD
50 ft maximum
Upper element to 130°F
(or owner preference)
Cold Inlet
Hot Outlet to
house
Powered
Water Heater
Cold Inlet from
Domestic supply
Hot Outlet
Unpowered
Water Heater
Field Supplied 3/4” brass nipple and “T”
Lower element to 120°F
Figure 15: UltraClassic HWG Double Tank Installation
Figure 16: Alternate UltraClassic HWG Piping
HOT WATER GENERATOR
Ultra Classic (VT) Series Page 13
ELECTRICAL-LINE VOLTAGE
All field installed wiring, including electrical ground,
must comply with the National Electrical Code as well as
all applicable local codes.
Refer to the unit wiring diagrams for fuse sizes and a
schematic of the field connections which must be made by
the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of the
compressor access panel to ensure proper electrical hookup.
All final electrical connections must be made with a
length of flexible conduit to minimize vibration and sound
transmission to the building.
To avoid possible injury or death due to
electrical shock, open the power supply
disconnect switch and secure it in an open
position during installation.
CAUTION: Use only copper conductors for field
installed electrical wiring. Unit terminals are not
designed to accept other types of conductors.
Figure 17: Line Voltage Field Wiring
Table 5: Electrical Data
General Line Voltage Wiring
Be sure the available power is the same voltage and
phase as that shown on the unit serial plate. Line and
low voltage wiring must be done in accordance with
local codes or the National Electric Code, whichever is
applicable.
Unit Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to the “L” side of the
contactor as shown in Figure 16. Consult Table 5 for
correct wire and fuse size.
External Loop Power Connection
If the unit is to be used with an external loop pump, the
pump(s) will be connected to the loop pump terminals in
the unit electrical box as shown in Figure 17. The pumps
will automatically be cycled as required by the unit.
208 Volt Operation
All 208-230 Volt units are factory wired for 230 Volt.
The transformers may be switched to 208V operation as
illustrated on the wiring diagram.
HWG Pumping Wiring
Install HWG Pump power wires on HWG Pump power
block after insuring water is in HWG circuit.
°
Transformer
Compressor A
Contactor
L1
L2
208-230/60/1
4 Amp Max.
Source Pump Ground
PR
ICM2
Controller
Pump
Circt Brkr
with ground
(see Elect. Table for wire
and Brkr. size)
Compressor B
Contactor
CXM Control - A
Low Voltage
Connector
CXM Control - B
Low Voltage
Connector
HWG
Install HWG Pump
Power after insuring
water is in HWG circuit
Yellow
Blk
External Loop Pump(s)
WARNING
WARNING
Page 14 Ultra Classic (VT) Series
ECM FAN MOTOR
“ne tune” airow adjustments. The TEST setting
runs the ECM motor at 70% torque, which causes
the motor to operate like a standard PSC motor, and
disables the CFM counter.
Dehumidication Mode settings: The
dehumidication mode setting provides eld
selection of humidity control. When operating in
the normal mode, the cooling airow settings are
determined by the cooling tap setting above. When
dehumidication is enabled there is a reduction in
airow in cooling to increase the moisture removal
of the heat pump. Consult submittal data or
specications catalog for the specic unit series and
model to correlate speed tap to airow in CFM. The
dehumidication mode can be enabled in two ways.
1. Constant Dehumidication Mode: When the
dehumidication mode is selected (via DIP
switch or jumper setting), the ECM motor will
operate with a multiplier applied to the cooling
CFM settings (approx. 20-25% lower airow).
Any time the unit is running in the cooling mode,
it will operate at the lower airow to improve
latent capacity. The “DEHUM” LED will be
illuminated at all times. Heating airow is not
affected. NOTE: Do not select dehumidication
mode if cooling setting is tap 1.
2. Automatic (Humidistat-controlled)
Dehumidication Mode: When the
dehumidication mode is selected (via DIP
switch or jumper setting) AND a humidistat
is connected to terminal DH (version II) or
HUM (version I), the cooling airow will only
be reduced when the humidistat senses that
additional dehumidication is required. The DH
(or HUM) terminal is reverse logic. Therefore, a
humidistat (not dehumidistat) is required. The
“DEHUM” LED will be illuminated only when the
humidistat is calling for dehumidication mode.
Heating airow is not affected. NOTE: Do not
select dehumidication mode if cooling setting is
tap 1.
Fan speeds are selected with jumpers for version
I or via a nine position DIP switch for version II. To
take full advantage of the ECM motor features, a
multi-stage thermostat should be used (2-stage
heat/2-stage cool or 3-stage heat/2-stage cool).
Note: Power must be off to the unit for at least three
seconds before the ECM motor will recognize a
speed change. The motor will recognize a change
in the CFM Adjust or dehumidication mode
settings while the unit is powered.
There are four different airow settings from lowest
airow rate (speed tap 1) to the highest airow rate
(speed tap 4). The charts below indicate settings for
both versions of the ECM interface board, followed
by detailed information for each setting.
Cooling settings: The cooling setting determines
the cooling (normal) CFM for all units with ECM
motor. Cooling (normal) setting is used when the
unit is not in dehumidication mode. This setting
also determines the heating CFM for Genesis (GS)
units. Tap 1 is the lowest CFM setting, while tap 4 is
the highest CFM setting. To avoid air coil freeze-up,
tap 1 may not be used if the dehumidication mode
is selected. Consult submittal data or specications
catalog for the specic unit series and model to
correlate speed tap setting to airow in CFM.
Heating settings: The heating setting determines
the heating CFM for Tranquility 27™ (TT) and
Tranquility 20™
(TS) units. This setting is not used
for Genesis (GS) units. Tap 1 is the lowest CFM
setting, while tap 4 is the highest CFM setting.
Consult submittal data or specications catalog
for the specic unit series and model to correlate
speed tap setting to airow in CFM.
Auxiliary/Emergency Heat settings: The auxiliary/
emergency heat setting determines the CFM when
the unit is in auxiliary heat or emergency heat
mode. This setting is used for residential units with
internal electric heat. When auxiliary electric heat
is energized (i.e. compressor and electric heat), the
greater of the auxiliary/emergency or heating setting
will be used. A “G” (fan) signal must be present from
the thermostat for electric heat to operate. Consult
the submittal data or specications catalog for the
specic unit series and model to correlate speed tap
setting to airow in CFM.
CFM Adjust settings: The CFM adjust setting
allows four selections. The NORM setting is the
factory default position. The + or – settings adjust
the airow by +/- 15%. The +/- settings are used to
Ultra Classic (VT) Series Page 15
Cooling settings: TT, TS, GS units* Heating settings: TT, TS units* Aux/Emerg Heat settings: TT, TS, GS units*
Version I Version I Version I
69243707 69243707 69243707
Tap HP CFM Tap DELAY Tap AUX CFM
Setting Jumper SW1 SW2 Setting Jumper SW3 SW4 Setting Jumper SW5 SW6
1 1 ON ON 1 1 ON ON 1 1 ON ON
2 2 ON OFF 2 2 ON OFF 2 2 ON OFF
3 3 OFF ON 3 3 OFF ON 3 3 OFF ON
4 4 OFF OFF 4 4 OFF OFF 4 4 OFF OFF
*GS units use the same settings for *This table not used for GS units. *Residential units
both cooling (normal) CFM and heating CFM.
CFM Adjust settings: TT, TS, GS units Dehum Mode settings: TT, TS, GS units
Version I Version I
69243707 69243707
Tap CFM Adj Tap Dehumid
Setting Jumper SW7 SW8 Setting Jumper
TEST 1 ON ON NORM pins 1,2
-2 ON OFF Dehumid pins 2,3
+3 OFF ON
NORM 4 OFF OFF
Version II
17B0019N01
DIP Switch
Version II
Version II
17B0019N01
Version II
17B0019N01
DIP Switch DIP Switch
ON
OFF
DIP Switch
Version II
17B0019N01
DIP Switch
17B0019N01
SW9
Table 6: ECM Board Tap Settings
Y
GGGGR
W
O
Y2
Y1
G
RCY2 Y1 GOWCRDH AL1 AAAL1
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
OFF ON
G
DEHUM
CFM
TB1
J1
S1
Thermostat
Input LEDs
CFM Counter
1 flash per 100 CFM
ECM Motor
Low Voltage
Connector
1/4" Spade
Connections
to CXM or
DXM Board
Thermostat
Connections
Dehumidification
LED
Fan Speed Selection DIP Switch
J01
A L
A L
A
G Y1 Y2 O W1 EM C R
G
Y1
Y2 O W1 EM NC C R Hum
3
2
14
3
2
1
4
3
3
2
1
2
2
1
4
3
2
1
4
5 6 7 8 9 10
L
LED's
TB01
CFM
Dehumid
Norm
Norm
Test
(–)
(+)
CFM
Adjust
Aux
CFM
HP
CFM
Delay
1/4" Spade
Connections
to CXM or
DXM Board
Thermostat
Input LEDs
CFM Counter
1 flash per 100CFM
ECM Motor
Low Voltage
Connector
Dehumidification
LED
Fan Speed Selection Jumpers
Thermostat
Connections
Figure 18a: ECM Version II Interface Layout Figure 18b: ECM Version I Interface Layout
ECM FAN MOTOR
Page 16 Ultra Classic (VT) Series
Figure 19: Low Voltage Field Wiring
Transformer
Compressor A
Contactor
L1
L2
208-230/60/1
4 Amp Max.
Source Pump Ground
PR
ICM2
Controller
Pump
Circt Brkr
with ground
(see Elect. Table for wire
and Brkr. size)
Compressor B
Contactor
CXM Control - A
Low Voltage
Connector
CXM Control - B
Low Voltage
Connector
HWG
Install HWG Pump
Power after insuring
water is in HWG circuit
Yellow
Blk
External Loop Pump(s)
Thermostat Connections
The thermostat should be wired directly to the ECM
control board as shown in Figure 19. Consult the
Thermostat section for specific wiring.
Water Freeze Protection - FP1
The CXM/DXM control allows the field selection of
source fluid freeze protection points. The factory setting
of FP1 is set for water (30°F). In earth loop applications
jumper JW3 (FP1- antifreeze 10°F) should be clipped as
shown in Figure 20 to change the setting to 10°F, a more
suitable temperature when using antifreezes in colder
earth loops.
Air Coil Freeze Protection - FP2
The Air coil freeze protection is factory set at 30°F and
should not need adjusting.
Figure 20: Changing FP1-Freeze Protection Setpoint
CXM PCB
Clip this JW3-FP1
jumper for anti-freeze
systems
ELECTRICAL - LOW VOLTAGE
Table 7: Blower performance table and fan speed selection
VT Blower Performance
Max Fan Normal Mode Dehumid Mode Aux Aux
Model ESP Motor Tap Htg & Normal Clg CFM Emerg
(in wg) (hp) Setting
Stg 2 Stg 1 Fan Stg 2 Stg 1 Fan Setting Mode
4 1290 710 650 1010 550 650 4 1290
036 0.5 1/2 3 1200 660 600 940 520 600 3 1200
2 1110 610 560 870 480 560 2 1110
1 1020 560 510 1 1020
4 1450 800 730 1130 620 730 4 1450
042 0.5 1/2 3 1400 770 700 1090 600 700 3 1400
2 1300 720 650 1010 560 650 2 1300
1 1190 660 600 1 1190
4 1720 950 860 1340 740 860 4 1720
048 0.75 1 3 1600 880 800 1250 690 800 3 1600
2 1480 810 740 1150 630 740 2 1480
1 1360 750 680 1 1360
4 2150 1180 1080 1680 920 1080 4 2150
060 0.75 1 3 2000 1100 1000 1560 860 1000 3 2000
2 1850 1020 930 1440 800 930 2 1850
1 1700 940 850 1 1700
4 2250 1280 1130 1760 1000 1130 4 2250
072 0.75 1 3 2130 1210 1070 1660 940 1070 3 2130
2 2000 1140 1000 1560 890 1000 2 2000
1 1900 1080 950 1 1900
Rev.: 07/06/05D
Bold figures indicate factory settings, setting on all models.
These values represent Left return models. For right return units move the CFM adj from (norm) to the (+) setting.
During Auxiliary operation the CFM will run at the higher of the HP or AUX settings.
Airflow is controlled within ±5% up to Max ESP shown with wet coil and with 1" throwaway filter.
Standard 1" electrostatic filter will add 0.15 in wg when clean.
When Dehumidification mode is selected, HP CFM setting must be 4, 3, or 2 only.
All units ARI/ISO/ASHRAE 13256-1 rated at maximum external static.
Revision Date
Data from Tom North 9/00 10/31/04 RRB
New data from T North added right return note adj. 072 numbers 3/31/05 RRB
Changed 042 w/ Aux Heat to match normal 2nd stage from TNorth 5/12/05 RRB
ECM BLOWER DATA
Ultra Classic (VT) Series Page 17
Accessory Connections
A terminal paralleling the compressor contactor coil
have been provided on the CXM/DXM control of the
UltraClassic line. "A" has been provided to control
accessory devices, such as water valves, electronic air
cleaners, humidifiers, etc. Note: This terminal should
be used only with 24 Volt signals and not line voltage
signals. This signal operates with the compressor contactor.
See Figure 21 or the wiring schematic for details.
Figure 21: Accessory Wiring
Figure 22: Well Water AVM Valve Wiring
Water Solenoid Valves
When using solenoid valves on ground water installations.
Figure 21 illustrates a typical well water control valve
wiring which will limit wasted water during a lockout
condition. A slow closing valve may be required to
prevent water hammer. When using an AVM -Taco
Slow Closing valves on UltraClassic Series equipment
Figure 20 wiring should be utilized. The valve takes
approximately 60 seconds to open (very little water will
flow before 45 seconds) and it activates the compressor
only after the valve is completely opened (by closing
its end switch). Only relay or triac based electronic
thermostats should be used with the AVM valve. When
wired as shown, the valve will operate properly with the
following notations:
1 - The valve will remain open during a unit lockout.
2 - The valve will draw approximately 25-35 VA through
the “Y” signal of the thermostat. Note: This can
overheat the anticipators of electromechanical
thermostats. Therefore only relay or triac based
thermostats should be used.
C
Ultra Classic
C
Thermostat
Y
1
2
3
Y
AVM
Taco Valve
Heater Switch
Thermostat Selection and Wiring
ATA32H01 - Auto Changeover electronic 3 Heat / 2
Cool thermostat
This electronic thermostat, Fig 23, is suited to all Ultra-
Classic applications.
The UltraClassic also employs an ECM board that features:
• Thermostat terminal connections
• Thermostat signal diagnostic LED's
• Airflow selection
• Airflow LED (100 cfm per flash)
• Dehumidification Mode Jumper
Figure 23: ATA32H01 wiring
ELECTRICAL - LOW VOLTAGE
Page 18 Ultra Classic (VT) Series
ELECTRICAL SCHEMATIC
Ultra Classic (VT) Series Page 19
Description of Operation LED Alarm Relay
Normal Mode On Open
Normal Mode with UPS Warning On Cycle (closed 5 sec., Open 25 sec.)
CXM is non-functional Off Open
Fault Retry Slow Flash Open
Lockout Fast Flash Closed
Over/Under Voltage Shutdown Slow Flash Open (Closed after 15 minutes)
Test Mode - No fault in memory Flashing Code 1 Cycling Code 1
Test Mode - HP Fault in memory Flashing Code 2 Cycling Code 2
Test Mode - LP Fault in memory Flashing Code 3 Cycling Code 3
Test Mode - FP1 Fault in memory Flashing Code 4 Cycling Code 4
Test Mode - FP2 Fault in memory Flashing Code 5 Cycling Code 5
Test Mode - CO Fault in memory Flashing Code 6 Cycling Code 6
Test Mode - Over/Under
shutdown in memory Flashing Code 7 Cycling Code 7
Test Mode - UPS in memory Flashing Code 8 Cycling Code 8
Test Mode - Swapped Thermistor Flashing Code 9 Cycling Code 9
Features
• Anti-short cycle protection
• High and Low pressure cutouts
• Water Coil freeze protection
• Air Coil freeze protection
• Random Start
• Unit Performance Sentinel
• Over/Under Voltage protection
• Diagnostic LED
• Reset Lockout at unit or disconnect
• Intelligent Reset
• Condensate Overflow sensor
• Test Mode
• Electric Heat Outputs
• Accessory Water Valve Connection
• Optional LonWorks Control
Field Selectable Inputs
Test Mode - Test Mode allows the service personnel to
check the operation of the control in a timely manner. By
momentarily shorting the test terminals, the CXM control
enters a 20 minute Test Mode period in which all time
delays are sped up 15 times. Upon entering Test Mode, the
Status LED will flash a code representing the last fault.
For Diagnostic ease at the thermostat, the alarm relay will
also cycle during test mode. The Alarm relay will cycle
on and off similar to the status LED to indicate a code
representing the last fault, at the thermostat. Test mode can
be exited by shorting the test terminals for 3 seconds.
CXM CONTROL DESCRIPTION
Retry Mode - If the control is attempting a retry of a fault,
the status LED will slow flash (slow flash = one flash
every 2 seconds) to indicate the control is in process of
retrying.
Note: In the following field configuration options,
jumper wires should be clipped ONLY when power is
removed from the CXM control.
Water Coil Freeze Protection Limit Setting - Jumper
2 (JW3-F12 Low Temp) provides field selection of
temperature limit setting for FP1 to be 30°F or 10°F.
Not Clipped = 30°F. Clipped = 10°F.
Air Coil Freeze Protection Limit Setting - Jumper
3 (JW2-FP2 Low Temp) provides field selection of
temperature limit setting for FP2 to be 30°F or 10°F.
Not Clipped = 30°F. Clipped = 10°F.
Alarm Relay Setting - Jumper 1 (JW1-AL2 Dry) provides
field selection of Alarm Relay terminal AL2 to be
jumpered to 24Vac or to be dry (no connection).
Not Clipped = AL2 connected to R. Clipped = AL2 dry
contacts (no connection).
DIP Switches
Unit Performance Sentinel Disable - Dip Switch 1
provides field selection to disable The UPS Feature
On = Enabled. Off = Disabled.
Stage 2 - Dip Switch 2 provides selection of whether
compressor has an on delay. If set to stage 2, the
compressor will have a 3 second delay before energizing.
Also, if set for stage 2, the alarm relay will NOT cycle
during test mode.
On = Stage 1. Off = Stage 2.
Table 8: LED & Alarm Relay Operations
Special Notes and Examples:
-Slow Flash = 1 flash every 2 seconds
-Fast Flash = 2 flashes every 1 second
-Flash code 2 = 2 quick flashes, 10 sec.
pause, 2 quick flashes, 10 sec. pause, etc.
Page 20 Ultra Classic (VT) Series
Safety Features
The following safety features are provided to protect
the compressor, heat exchangers, wiring and other
components from damage caused by operation outside of
design conditions.
Anti-Short Cycle Protection- The control features a 5
minute anti-short cycle protection for the compressor.
Note: The 5 minute anti-short cycle also occurs at
power up.
Random Start - The control features a random start upon
power up of from 5-80 seconds.
Fault Retry - In Fault Retry mode, the Status LED begins
slow flashing to signal that the control is trying to recover
from a fault input. The CXM control will stage off the
outputs and then “try again” to satisfy the thermostat "Y"
input call. Once the thermostat input calls are satisfied,
the control will continue on as if no fault occured. If 3
consecutive faults occur without satisfying the thermostat
"Y" input call, then the control will go to Lockout mode.
The last fault causing the lockout will be stored in
memory and can be viewed by going into test mode.
Lockout - In Lockout mode, the Status LED will
begin fast flashing. The compressor relay is turned
off immediately. Lockout mode can be soft reset via
the thermostat “Y” input or can be hard reset via the
disconnect. The last fault causing the lockout will be
stored in memory and can be viewed by going into test
mode.
Lockout with Emergency Heat - While in Lockout mode,
if W becomes active, then Emergency Heat mode will
occur.
High Pressure Switch - When the High Pressure Switch
opens due to high refrigerant pressures, the Compressor
relay is de-energized immediately since the High Pressure
Switch is in series with the compressor contactor coil.
The High Pressure Fault recognition is immediate as well.
High Pressure Lockout Code = 2
Example: 2 quick flashes, 10 sec pause, 2 quick flashes,
10 sec. pause, etc.
Low Pressure Switch - The Low Pressure Switch must be
open and remain open for 30 continuous seconds during
"on" cycle to be recognized as a Low Pressure fault. If
the low pressure switch is open for 30 seconds prior to
compressor power up it will be considered a low pressure
(loss of charge) fault. The Low Pressure Switch input is
bypassed for the initial 60 seconds of a compressor run
cycle. Low Pressure Lockout Code = 3.
thermistor temperature must be below the selected freeze
protection limit setting for 30 continuous seconds during
a compressor run cycle to be recognized as a FP1 fault.
The FP1 input is bypassed for the initial 60 seconds of a
compressor run cycle. FP1 Lockout Code = 4.
Air Coil Freeze Protection (FP2) - The FP2 thermistor
temperature must be below the selected freeze protection
limit setting for 30 continuous seconds during a
compressor run cycle to be recognized as a FP2 fault.
The FP2 input is bypassed for the initial 60 seconds of a
compressor run cycle. FP2 Lockout Code = 5.
Condensate Overflow - The Condensate Overflow sensor
must sense overflow levels for 30 continuous seconds to
be recognized as a CO fault. Condensate Overflow will be
monitored at all times. CO Lockout Code = 6.
Over/Under Voltage Shutdown - An Over/Under Voltage
condition exists when the control voltage is outside the
range of 19Vac to 30Vac. Over/Under Voltage Shutdown
is self resetting in that if the voltage comes back within
range of 19Vac to 30Vac for at least 0.5 seconds, then
normal operation is restored. This is not considered a fault
or lockout. If the CXM is in over/under voltage shutdown
for 15 minutes, the alarm relay will close. Over/Under
Voltage Shutdown Code = 7.
Unit Performance Sentinel-UPS (patent pending) - The
UPS feature warns when the heat pump is operating
inefficiently. A UPS condition exists when:
a) in heating mode with compressor energized, if FP2 is
greater than 125°F for 30 continuous seconds,
or
b) in cooling mode with compressor energized, if FP1 is
greater than 125°F for 30 continuous seconds, or FP2
is less than 40°F for 30 continuous seconds.
If a UPS condition occurs, the control will immediately go
to UPS warning. The status LED will remain on as if the
control is on Normal mode. (see"LED and Alarm Relay
Operation Table" ). Outputs of the control, excluding LED
and Alarm Relay, will NOT be affected by UPS. The UPS
condition cannot occur during a compressor off cycle.
During UPS warning, the alarm relay will cycle on and
off. The cycle rate will be On for 5 seconds, Off for 25
seconds, On for 5 seconds, Off for 25 seconds, etc. Unit
Performance Sentinel Warning Code = 8.
CXM CONTROL DESCRIPTION
Water Coil Freeze Protection (FP1) - The FP1
This manual suits for next models
4
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