Bulldog Security KlassKeeper KKV024 Instruction manual

Last Revised April 2020
Installation, Operation,
& Maintenance Manual
KlassKeeper Heat Pump
KlassKeeper
Models: KKV024 –KKV048

KlassKeeper –Installation, Operation, and Maintenance Manual 1
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Table of Contents
INFORMATION...................................................................................................................................3
Handling....................................................................................................................................................3
Storage......................................................................................................................................................3
Weight.......................................................................................................................................................3
Unit Dimensions ........................................................................................................................................4
Refrigerant Charge....................................................................................................................................5
Unit Clearances .........................................................................................................................................5
INSTALLATION ...................................................................................................................................6
Delivery and General Installation Checklist...............................................................................................6
Location.....................................................................................................................................................6
Cabinet Placement .................................................................................................................................... 6
Dry Walling (when required).....................................................................................................................7
Piping ........................................................................................................................................................7
Wiring........................................................................................................................................................ 8
OPERATION .......................................................................................................................................9
Inputs & Outputs.......................................................................................................................................9
Operating Modes ....................................................................................................................................10
Alarms .....................................................................................................................................................11
LCD Display Module ................................................................................................................................13
COMMISSION & STARTUP ................................................................................................................14
System Flushing.......................................................................................................................................14
System Fluid ............................................................................................................................................14
System Water pH ....................................................................................................................................14
Water Flow Rate .....................................................................................................................................14
Water System Freeze Protection.............................................................................................................15
Remove Air from System fluid Loop ........................................................................................................15
Air Balancing...........................................................................................................................................15
Clean Unit Filters.....................................................................................................................................15
Fan Rotation:...........................................................................................................................................15
Start-up: ..................................................................................................................................................15

KlassKeeper –Installation, Operation, and Maintenance Manual 2
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
MAINTENANCE ................................................................................................................................17
Inspect Filters ..........................................................................................................................................17
Check Fan motors annually.....................................................................................................................17
Visual Inspection .....................................................................................................................................17
Amperage Check on compressor and fan motor.....................................................................................17
Safety Control Reset................................................................................................................................18
Drain Pan and Condensate Hose.............................................................................................................18

KlassKeeper –Installation, Operation, and Maintenance Manual 3
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
INFORMATION
Handling
Care must be taken in handling the cabinet, chassis, built in ERV and other accessories to ensure that this
equipment does not sustain any damage.
The protective shipping packaging should be kept on until unit is ready for installation. During
construction, the equipment must be sheltered from contaminants and debris such as drywall dust, wood
chips, or paint as these may damage the fan, or block the cooling / heating coil and diminish unit
performance.
Storage
The unit must, at all times, be stored in an upright position with the compressor section at the bottom
and the fan section oriented up.
Failure to maintain the chassis in an upright position may result in permanent damage to the unit.
Dropping the chassis or exposing it to extreme shock or vibration may also result in permanent damage
to the interior components and piping.
Both the chassis and cabinet should be stored in a non-corrosive environment sheltered from conditions
of extreme temperature or humidity. Subjecting the unit to conditions of this nature may result in
significantly reduced performance, reliability, and operational life.
The unit is intended for interior use only and should be stored indoors at all times to protect it from the
elements and to help eliminate the potential growth of indoor air quality (IAQ) contaminants.
If indoor storage is not possible, the equipment may be stored outdoors during the summer months only,
if the following provisions are met:
1. The equipment must be placed on a dry surface, or raised off the ground in a manner which allows
for air-circulation beneath the unit.
2. A waterproof tarp must be used to cover the equipment in order to provide protection from the
elements.
3. Continuous ventilation to the units must be provided to help prevent moisture accumulation on
the interior and exterior surfaces. Moisture buildup on, or within the unit’s insulation may result
in microbial growth that can lead to odors and serious health-related IAQ problems.
4. The chassis must be stored in their original packaging.
5. The individual units shall not be stacked on top of one another.
6. If the unit was previously in use, ensure that all water in the coil has been blown out and that all
hose connections are plugged during storage.
Weight
Model
KKV024
KKV030
KKV036
KKV042
KKV048
Chassis Weight (lbs)
280
280
280
300
300
Cabinet Weight (lbs)
480
Standard Plenum Weight (lbs)
60

KlassKeeper –Installation, Operation, and Maintenance Manual 4
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Unit Dimensions

KlassKeeper –Installation, Operation, and Maintenance Manual 5
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Refrigerant Charge
Model
KKV024
KKV030
KKV036
KKV042
KKV048
R410A Charge (oz.)
40
45
50
60
Consult factory
Unit Clearances
Clearances for the KlassKeeper units shall be provided such that the access panel swinging door opens
and closes without obstruction to allow service access to the filters, the unit disconnect, fans and fan
motors, and unit chassis.
In the event of chassis replacement, the front service entrance must permit straight horizontal removal
of the chassis. The return air path must be unobstructed during operation.

KlassKeeper –Installation, Operation, and Maintenance Manual 6
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
INSTALLATION
The Installation of KlassKeeper units and accessories must be in accordance with all local codes and
regulations of all relevant governing authorities having jurisdiction. The following installation procedures
are recommended by the Manufacturer.
It is the responsibility of the installing contractor to comply with all applicable codes and regulations.
It is the responsibility of the installing contractor to ensure adequate service clearance for regular
maintenance or for repair in place, is exercised. The installing contractor will be responsible for
removing the unit if it is not repairable in place.
Delivery and General Installation Checklist
The information below details the correct installation procedure for a KlassKeeper unit. Please read this
document in its entirety prior to proceeding with unit installation.
Specific site conditions may warrant variations in locations and dimensions.
1. Remove packaging and inspect the unit. Check for shipping damage or material shortage; file a
freight claim and notify your sales representative if damage or deficiency is found.
2. Verify the correct model and voltage as indicated by the model number.
3. Verify the installation location of the unit.
4. Verify that the power supply complies with the nameplate specification.
5. Connect properly sized and protected power supply wiring to the disconnect in the cabinet.
6. Install proper grounding wires to an earth ground on the cabinet as well as the receptacle.
Location
Locate the unit in an indoor area. The indoor air temperature surrounding and being supplied to the unit
must, at all times, be above 45F (7C). Do not locate the unit in areas subject to freezing.
Cabinet Placement
1. Ensure that there is sufficient clearance in front of the unit to allow the swinging access door to
open freely. A minimum of 5 feet shall be left unoccupied in front of the unit at the same width
as the unit.
2. Plenum (when ordered) is factory assembled and shipped loose for field installation by others.
Plenum is mounted on the cabinet’s top.

KlassKeeper –Installation, Operation, and Maintenance Manual 7
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Dry Walling (when required)
It is permissible to glue or screw drywall directly to the side of the cabinet. Please note that the drywall
screw must not be longer than the drywall thickness plus a maximum 3/8”.
Ensure drywall is not obstructing the swinging access door.
Piping
CAUTION: Piping must comply with all applicable codes and regulations.
1. Run supply, return and condensate pipe inside the cabinet through the top knockouts
2. Install isolation valves to permit unit removal for servicing.
3. DO NOT bend or kink supply lines or hoses (If supplied). Supply and return hoses are fitted with
swivel joint fittings at one end to allow removal for future servicing.

KlassKeeper –Installation, Operation, and Maintenance Manual 8
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Wiring
1. Connect the wire harnesses
between the chassis, ERV and
cabinet as per the below diagram.
2. Connect the power plug to the
receptacle in the cabinet.
Wire Harness
Type
Harness Length
Harness Pin #
I/O
1
Signal
42”
12
DI 1-5, AN1, AN3, K7
2
Signal
42”
5
K5, K8, spare
3
Signal
18”
9
TH4-TH7
A
Power
42”
4
ERV Power
B
Power
42”
6
Fan(s) Power

KlassKeeper –Installation, Operation, and Maintenance Manual 9
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
OPERATION
Inputs & Outputs
The KlassKeeper can be completely controlled by a BAS without a third party controller or a thermostat.
Modbus RTU is standard. BACnet gateway is optional.
The controller within the KlassKeeper heat pump controls the operation of the unit and has several sets
of inputs and outputs, both digital and analog. Their assignments are outlined below:
Digital Inputs
DI1 = Heat Call
DI2 = Cool Stage 1
DI3 = Cool Stage 2
DI4 = Fan Call
DI5 = ERV Call
DI6 = High Pressure Switch
DI7 = Low Pressure Switch
DI8 = Condensate Detector
Note: Inputs DI1 - DI5 are connected to dry-contacts on the third party controller or thermostat.
Analog Inputs
TH1 = Discharge Air Temperature –“TA”
TH2 = Refrigerant Temperature –“TR”
TH3 = Leaving Water Temperature –“TW”
TH4 = Exhaust Entering Air Temperature on ERV –“EX-EAT”
TH5 = Exhaust Leaving Air Temperature on ERV –“EX-LAT”
TH6 = Fresh Air Entering Temperature on ERV –“FRSH-EAT”
TH7 = Fresh Air Leaving Temperature on ERV –“FRSH-LAT”
TH8 = Mixed Air Temperature (Space Return + Fresh Air Leaving) –“MIX-AT”
Note: All temperatures are measured using 10KΩ Type II thermistors.
Digital Outputs
K1 = Compressor Stage 2
K2 = Compressor Stage 1
K3 = Main Fan - Low Speed
K4 = Main Fan - High speed
K5 = ERV Fan
K6 = Cooling Valve
K7 = General Alarm Contact
K8 = ERV Heat wheel
Note: Outputs K2, and K7 are dry-contacts; K1, K3, K4, K5, K6, and K8 provide 24VAC.
Analog Outputs
AN1 = Alarm Flash Code Status Indicator (0-10VDC)
AN2 = Modulating Heat Valve (0-10VDC).
AN3 = DAT Setpoint Signal (0-10VDC). It scales DAT setpoint setting on screen to 0-10VDC where
0V= 50oF and 10V = 100oF

KlassKeeper –Installation, Operation, and Maintenance Manual 10
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Operating Modes
The KlassKeeper heat pump has several modes of operation including: heating, cooling (first stage),
cooling (second stage), and fan. The unit is also equipped with an energy recovery ventilator (ERV). Each
of these modes of operation is invoked by closing the associated digital input on the internal unit
controller or via BAS, third party controller or thermostat.
Heating
In order to put the unit into heating mode, contact DI1 on the unit controller must be closed through a
dry contact on the thermostat or the unit-mounted third party controller by others or BAS. This will first
activate the main fan in low-speed, followed by high-speed if the heat call remains in place for 10 minutes
or more. A modulating heat valve that controls the flow of hot water through the unit’s heating coil is
opened 100% whenever a heat call is in place.
Cooling
In order to put the unit into cooling mode, contact DI2 on the unit controller must be closed through a
dry contact on the thermostat or the unit-mounted third party controller by others. This will activate the
fan in high speed, and will also start the first stage of the compressor for cooling. A cooling valve that
directs water to the condenser will also be opened whenever there is a cool call in place.
To bring on the second stage of cooling, contact DI3 on the unit controller must be closed through a dry
contact on the unit mounted third party controller by others. In order for second stage cooling to
commence, first stage cooling must first be activated.
Note that each compressor stage has a minimum off-time of one minute between calls. There is no
minimum on-time.
During cooling operation, if the fresh air entering temperature (FRSH-EAT) is cooler than the exhaust
entering air temperature (EX-EAT) by 5°F or more, the heat wheel will be deactivated to allow “free
cooling” to take place.
Fan
The main fan can be activated in low speed at any time by closing contact DI4 on the unit controller
through a dry contact on the unit mounted third party controller by others. If there is a heat or cool call
in place, the operation of the fan is automatic.
Energy Recovery Ventilator (ERV)
The KlassKeeper heat pump is equipped with an energy recovery ventilator that brings in fresh outside
air, while simultaneously exhausting indoor air. A heat wheel is used to pre-condition the incoming fresh
air, by recovering/rejecting heat from/to the outgoing exhaust air.
To activate the ERV function, digital input DI5 on the unit controller must be closed through a dry-contact
on the unit-mounted third party controller by others. This will activate both the ERV fan as well as the
main fan (in low speed), while also energizing the heat wheel. The hot water valve modulates to maintain
the discharge air temperature of 72oF (adjustable on the display or BAS)

KlassKeeper –Installation, Operation, and Maintenance Manual 11
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
During ERV operation, if the fresh air leaving temperature (FRSH-LAT) drops below 40°F, both the heat
wheel and ERV fan will be de-energized and an alarm will be activated. This condition may be an indication
of a heat wheel malfunction.
Alarms
The KlassKeeper heat pump is monitored during its operation for correct performance. In the event that
a potentially damaging or harmful situation is encountered, the unit will be deactivated and an alarm will
be generated.
General Alarm Contact –K7
Digital output relay K7 is a dry-contact that is energized whenever an alarm is currently in place. Once the
alarm condition has been alleviated, this alarm contact will be de-energized.
Alarm LED –Flashcode
The Flex controller has a multi-colored Alarm LED that is used to communicate the previous alarm (if any)
through the use of flashcodes. If there have been no alarms, this LED will be green. If an alarm has
occurred, this LED will flash red. The flashcodes are listed below:
Green = OK, no alarms have occurred since reset.
1 = Low Discharge Air Temperature
2 = Low Refrigerant Temperature
3 = Low Water Temperature
4 = High Water Temperature
5 = Low Refrigerant Pressure
6 = High Refrigerant Pressure
7 = Heatwheel Malfunction
8 = Condensate Alarm
10 = System Lockout
Alarm Output (0-10VDC)
Analog Output 1 (AN1) will also output a voltage between 0-10VDC (+\- 0.2VDC) which serves as an
indicator of previous alarms (if any). The output voltages associated with each alarm are outlined below:
0 VDC = OK, no alarms have occurred since reset.
1 VDC = Low Discharge Air Temperature
2 VDC = Low Refrigerant Temperature
3 VDC = Low Water Temperature
4 VDC = High Water Temperature
5 VDC = Low Refrigerant Pressure
6 VDC = High Refrigerant Pressure
7 VDC = Heatwheel Malfunction
8 VDC = Condensate Alarm
10 VDC = System Lockout

KlassKeeper –Installation, Operation, and Maintenance Manual 12
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Low Discharge Air Temperature
If at any point the discharge air temperature (TA) drops below 40°F, the compressors will be turned off,
the general alarm contact (K7) will be energized, a flashcode of 1 will be displayed, and the alarm output
(AN1) will produce 1 VDC.
Low Refrigerant Temperature
If at any point the refrigerant temperature (TR) drops below 35°F, the compressors will be turned off, the
general alarm contact (K7) will be energized, a flashcode of 2 will be displayed, and the alarm output (AN1)
will produce 2 VDC.
Low Water Temperature
If at any point the water temperature (TW) drops below 60°F, the compressors will be turned off, the
general alarm contact (K7) will be energized, a flashcode of 3 will be displayed, and the alarm output (AN1)
will produce 3 VDC.
High Water Temperature
If at any point the water temperature (TW) rises above 140°F, the compressors will be turned off, the
general alarm contact (K7) will be energized, a flashcode of 4 will be displayed, and the alarm output (AN1)
will produce 4 VDC.
Low Refrigerant Pressure
If the low pressure switch opens after the compressor has been running for three minutes, a low pressure
alarm will be activated, the compressor will be turned off, the general alarm contact (K7) will be energized,
a flashcode of 5 will be displayed, and the alarm output (AN1) will produce 5 VDC.
A low pressure alarm will also be activated if the low pressure switch opens without the compressor
running.
High Refrigerant Pressure
If the high pressure switch opens at any time, the compressors will be turned off, the general alarm
contact (K7) will be energized, a flashcode of 6 will be displayed, and the alarm output (AN1) will produce
6 VDC.
Heat Wheel Malfunction
During ERV operation, if the fresh air leaving temperature (FRSH-LAT) drops below 40°F, both the heat
wheel and ERV fan will be de-energized and an alarm will be activated. The general alarm contact (K7) will
be energized, a flashcode of 7 will be displayed, and the alarm output (AN1) will produce 7 VDC.
Condensate Overflow
If there is water accumulated in the drain an alarm will be activated. The general alarm contact (K7) will
be energized, a flashcode of 8 will be displayed, and the alarm output (AN1) will produce 8 VDC.
The fan should stop for 30 seconds to refill the condensate trap.
System Lockout
If there are three low pressure alarms or three high pressure alarms in a 24-hour period, the system will
go into a hard lockout.
If either the high pressure switch or the low pressure switch remains open for 10 minutes, the system will
also go into a hard lockout.

KlassKeeper –Installation, Operation, and Maintenance Manual 13
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
When the system is locked out, all of the output relays will be de-energized except for the general alarm
contact (K7) which will be energized. A flashcode of 10 will be displayed, and the alarm output (AN1) will
produce 10 VDC. In order to clear a system lockout, power must be cycled to the KlassKeeper unit.
LCD Display Module
Within the electrical compartment of the KlassKeeper heat pump, there is a LCD display module that
provides information about the unit’s operation. The first button on the left allows the user to scroll
through three separate screens.
Screen 1:
This screen provides information on the alarm status of the unit. Both the current alarm (if active) and the
previous alarm is displayed.
Screen 2:
This screen provides the current temperature readings of the various sensors within the unit. Please refer
to “Analogue Inputs” section for more details. The temperatures are updated every 10 seconds.
Screen 3:
This screen provides the open/closed status of the digital inputs on the controller. Please refer to “Digital
Inputs” section for further details. A “1” signifies a closed input, while a “0” signifies an open input.
Screen 4:
This screen provides the discharge air temperature setpoint (DAT SP) which is adjustable using ‘UP’ and
‘DOWN’ button.

KlassKeeper –Installation, Operation, and Maintenance Manual 14
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
COMMISSION & STARTUP
CAUTION:
To avoid fouled machinery, extensive unit clean up and void warranty, do not operate units without
filters in place or use as a temporary heat source during construction.
The Bulldog KlassKeeper Heat Pump provides year round cooling and heating as controlled by unit
thermostat or by a direct digital controller.
It provides cooling using a water-cooled refrigeration circuit and provides heating using a hydronic coil.
The compressor operates during cooling operation only and does not operate during heating operation
thereby providing quieter operating sound levels and energy cost savings. The heat recovery module adds
additional energy savings by transferring energy from the exhaust air to the supply air stream.
Central heat injection and rejection equipment is automatically controlled via a CGC control panel (or
equivalent) to provide the required loop water temperature for correct KlassKeeper Bulldog Heat Pump
units operation.
System Flushing
Proper system cleaning and flushing is an important aspect of the commissioning and start up procedure
for KlassKeeper Units. Ensure the system has been flushed properly. This prevents fouling of the unit heat
exchangers.
NOTE: Hydronic coils are not 100% drainable.
System Fluid
Ensure that system water temperature is within an acceptable range to facilitate start-up (80-120F) for
cooling and (100F –140F) for heating
System Water pH
System water should have a neutral pH balance of approximately 7.5, which will extend the life of the
hoses, heat exchangers, and other water side accessories.
Water Flow Rate
Open all isolation valves to the unit. Ensure that the entering and leaving fluid temperatures of the unit
in operation are acceptable. Typically there is an 8-15⁰F (4.4-8.3⁰C) drop in heating and 10-15⁰F (5.5-8.3⁰C)
rise in cooling. Under extreme conditions, slight variances in the temperature may be noted.

KlassKeeper –Installation, Operation, and Maintenance Manual 15
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Water System Freeze Protection
Ensure that freeze protection is provided for the outdoor portion of the water loop system. Inadequate
freeze protection can lead to coil damage.
NOTE: A potential situation may occur during construction where the system fluid loop is drained after
being cleaned, flushed and tested. KlassKeeper unit will not completely drain and may hold fluid in the
condenser or the heating coil. Extensive damage may result to internal components if the system fluid
freezes –an adequate glycol concentration must be added if a possibility of freezing exists.
Remove Air from System fluid Loop
Air in the system impairs unit operation and can cause erosion in the system piping.
Air Balancing
Air balancing of the system should be performed while the unit’s fan is operating at high-speed. In order
to ensure the fan is operating at high-speed, the unit must be placed into cool mode.
Clean Unit Filters
Check to ensure the unit filters are clean: each KlassKeeper unit is equipped with three filters –a pleated
supply air filter and a wire-frame fresh and return air filters. This contributes to the proper operation of
the unit by ensuring adequate air flow across the coil. For wire-frame filter only, a vacuum may be used
to remove any debris or dirt.
SAFETY NOTE: In the following part of the procedure it will be necessary to access the areas around the
electrical wiring and the circuit board. Do not adjust or remove any board connections or wiring
connections to other components without first powering down the unit. Disconnects are usually within
reach of the unit. Exercise caution at all times.
Fan Rotation:
Inspect all fans (circulating, outside air supply and exhaust air fans) in the unit to ensure they are clean of
any debris and rotate freely.
NOTE: This equipment is designed for indoor installation ONLY.
Start-up:
To register the unit warranty proper start-up is required by a factory approved technician. The following
items must be recorded and returned to the factory to register the warranty. The factory reserves the
right to refuse warranty if these details are not provided.

KlassKeeper –Installation, Operation, and Maintenance Manual 16
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Operational Expectations
The BULLDOG KlassKepper Heat Pump is designed to provide reliable heating and cooling right out of the
box. However, transportation and handling damage, service valve leakage, or system problems may cause
less than optimum operation. In the event that the qualified commissioning agents suspect there is an
operational problem with the heat pump, they need to inform the factory immediately for direction. In
certain instances, the factory may request a manifold refrigeration gauge be attached to the heat pump
along with thermo-couples to determine the operating parameters of high and low pressure, and super
heat and sub cooling. Based on this information the factory may request the charge be adjusted or the
refrigeration components be adjusted to optimize cooling operation.

KlassKeeper –Installation, Operation, and Maintenance Manual 17
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
MAINTENANCE
WARNING:
To prevent injury or death due to electrical shock or contact with moving parts, disable the unit using
the electrical disconnect before servicing.
Inspect Filters
Establish a regular maintenance schedule. Clean filters frequently and replace as needed.
Supply air filter removal:
To remove the supply filter from the unit lift the filter up, pull the bottom towards self, and pull the filter
down and out of the unit. Replace the old filter by sliding the top edge of a new filter up into the rack,
then pushing in the bottom of the filter away from self and drop it into place.
ERV Return air filter removal:
To remove the fresh air filter unscrew the corresponding access panel on the left of the cabinet and slide
the filter out. Slide a new filter into place; make certain the arrow on the filter is pointing in the direction
of the airflow.
ERV Fresh air filter removal:
To remove the fresh air filter unscrew the corresponding access panel of the cabinet and slide the filter
out. Slide a new filter into place; make certain the arrow on the filter is pointing in the direction of the
airflow.
Check Fan motors annually
Make sure to inspect fan motors for unusual signs of wear. All BULLDOG KlassKeeper Heat Pump fan
motors are permanently lubricated when shipped from the factory. Do not oil the fan motors.
Visual Inspection
Visually inspect units and give special attention to hose assemblies. Note any signs of deterioration or
cracking and repair leaks immediately.
Amperage Check on compressor and fan motor
Current draw on this equipment should not exceed normal full load or rated load amps by more than 10
percent of the values noted on the unit nameplate.

KlassKeeper –Installation, Operation, and Maintenance Manual 18
© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
Safety Control Reset
All BULLDOG Heat Pump Systems include high and low pressure switches to prevent the machine from
operating under abnormal conditions of temperature or water flow. If multiple pressure alarms occur in
24 hours, the compressor operation will be permanently locked out until the unit is reset, or power is
disconnected for 20 seconds.
NOTE: If the heat pump must be reset more than twice, check the unit for a dirty air filter, abnormal
entering water temperature, inadequate water flow (delta T method), or internal malfunctions that may
be causing high or low pressure conditions. If the unit continues to alarm, contact a trained service
technician and ensure the problems are resolved before re-setting the unit again.
∆T Method: The normal water temperature differential for a BULLDOG Heat Pump is 8-15⁰F (4.4-8.3⁰C) in
heating and 10-15⁰F (5.5-8.3⁰C) in cooling.
Drain Pan and Condensate Hose
Make sure to inspect and clean if necessary, the condensate hose and drain pan on a regular basis.