Bulldog security Slimkeeper slk008 Owner's manual

Installation

Operation

Maintenance

BULLDOG SlimKeeper

Horizontal Heat Pump

SlimKeeper Horizontal

Models: SLK008- SLK015

www.bulldogheatpump.com

2 
BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual 
 
 
© Copyright 2013 CGC Group Inc. Installation Operation Maintenance Manual is Subject to Change without Notice Last Revised Nov 15 2019 
 
Table of Contents 
INFORMATION...............................................................................................................................................3 
Handling ........................................................................................................................................................ 3 
Storage .......................................................................................................................................................... 3 
Weight/Dimensions/Clearances ................................................................................................................... 4 
INSTALLATION ...............................................................................................................................................5 
DELIVERY AND GENERAL INSTALLATION CHECKLIST.....................................................................................5 
OPERATION ...................................................................................................................................................8 
CAUTION: ......................................................................................................................................................8 
FAN OPERATION..........................................................................................................................................10 
HEATING OPERATION.................................................................................................................................. 10 
COOL START UP........................................................................................................................................... 10 
COOL OPERATION .......................................................................................................................................11 
OPERATION ALGORITHM ............................................................................................................................13 
THERMOSTAT CONNECTIONS ..................................................................................................................... 13 
SHUTDOWN OUTPUT ..................................................................................................................................14 
FAULT ALARM OUTPUT ...............................................................................................................................14 
COMMISSION & START UP..........................................................................................................................15 
MAINTENANCE............................................................................................................................................18 
UNIT DRAWING ...........................................................................................................................................19 
STANDARD WIRING DIAGRAM....................................................................................................................20 
 
 
 
 
 
 
 
 
 
 
 
 
 

BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual

INFORMATION

Handling

Care must be taken in handling the horizontal unit and other accessories to ensure that this

equipment does not sustain any damage.

The protective shipping and packaging should remain on the unit until it is ready for

installation. During construction, the unit must not be run and shall be sheltered from

contaminants and debris such as drywall dust, wood chips, and paint that could damage the

fan or block the cooling/heating coil which may result in diminished performance.

Storage

The unit must be stored in an upright position at all times.

Failure to maintain the unit in an upright position may result in permanent damage to the unit.

Dropping the unit or exposing it to extreme shock or vibration may also result in permanent

damage to the interior components and piping.

The unit 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 units 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.

BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual

REFRIGERANT CHARGE

Unit Model

008

010

012

015

R410A Charge (oz.)

Weight/Dimensions/Clearances

Weight & Dimensions:

Model

008

010

012

015

Weight (lb)

125

135

Dimensions (W X D X H)

30 X 24 X 11

Unit Clearances:

For Service Clearances, please refer to the BULLDDOG SlimKeeper Unit drawing. All four

arrangements and their service clearances can be seen there.

The installation of all BULLDOG SlimKeeper products and components and accessories must be

in accordance with all local code and regulations of all governing authorities having jurisdiction.

The manufacturer recommends the following installation procedures.

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 serviceable in place.

BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual

INSTALLATION

The Installation of BULLDOG SlimKeeper Horizontal units and accessories must be in

accordance with local codes and all 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 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 serviceable in place.

DELIVERY AND GENERAL INSTALLATION CHECKLIST

The list below summarizes the steps required to successfully install a Horizontal SlimKeeper

unit:

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 model.

3. Verify that the power supply complies with the nameplate specification.

4. Connect properly sized and protected power supply wiring to the disconnect (not

supplied).

5. Install proper grounding wires to an earth ground.

1) Water Inlet, 1/2” FPT

2) Water Outlet, 1/2” FPT

3) Condensate Drain

4) High Voltage Power Cord

5) Low Voltage Access, 7/8”

Figure 1

BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual

LOCATION

1. Determine future horizontal mount

location with clearances shown in the

dimensioned drawings.

2. Locate the unit in an indoor area. The air

temperature surrounding and being

supplied to the unit must be above 45°F

(7°C) at all times. Do not locate the unit

in areas subject to freezing.

PLACEMENT

1. Position the unit and fasten to ceiling

ensuring the unit is leveled. Extension

Rods (not supplied by CGC) and Rubber

isolators are to be used. DO NOT block

access panels with mounting rods.

2. Meet specified clearances to provide

room for removal of all access panels.

3. Provide access to water valves (9&10)

and fittings, as well as screwdriver access

to the unit side panels, discharge air

collar, and all electrical connections.

PIPING

CAUTION: Piping must comply with all applicable

codes and regulations.

1. Install isolation valves (9 &10) at each unit to

permit unit removal for servicing.

2. DO NOT bend or kink supply lines or hoses (If

supplied). Supply and return ultra flex hoses

(7) available from the factory are fitted with

swivel joint fittings at one end to allow

removal for future servicing

NOTE: Insulation of the water piping loop is not required except where piping runs through

unheated areas or areas on the exterior of the building. The normal loop operating

temperature range is 85°F (29°C) to 120°F (49°C).

Figure 2

7- Hydronic Ultra Flex Hose

8- Valve for Return line

9- Valve for Supply line

BULLDOG SlimKeeper Horizontal –Installation Operation Maintenance Manual

WIRING

1. Wire room thermostat to electrical panel as indicated on the wiring diagrams on page

19.

2. Connect power.

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

OPERATION

CAUTION:

To avoid fouled machinery, extensive unit clean up, and void warranty, do not operate units

without air filters in place, and do not operate units during the construction process.

The BULLDOG Heat Pump provides year round cooling and heating as controlled by the unit

thermostat or by a direct digital controller.

The BULLDOG Heat Pump provides cooling with a water-cooled refrigeration circuit, and

provides heating using a hydronic coil. The compressor operates in the cooling mode only and

shuts down during the heating mode providing for quieter operation, extended compressor

life, and a reduction in energy consumption.

To ensure correct operation, centralized equipment located within the building mechanical

room is automatically controlled to provide each heat pump unit with water that is at the

appropriate temperature and flow rate.

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

The unit circuit board incorporates six relay outputs with the following functions:

K1 –Auxiliary relay for cooling valve on a two-valve unit or heat valve on a dehumidification

unit.

K2 –Heating Relay

K3 –Alarm Relay

K4 –Compressor Relay

K5 –Low Fan or Fan Relay for belt drive units

K6 –High Fan or Compressor #2 on belt drive units

Each of these relays have, in parallel, a green LED indicator that lights up when the relay is

energized.

The circuit board incorporates digital inputs that are opto-coupled to a 24V AC source. These have

amber LED indicators located near the input locations which are lit when the input is closed. The

inputs include:

High Pressure Switch

Low Pressure Switch

Heat Call (W on thermostat terminal)

Cool Call (Y on thermostat terminal)

Fan Call (G on thermostat terminal)

Auxiliary (A on thermostat terminal)

Compressor shutdown (24V AC signal thru O/O). Providing a continuous 24V potential to

O/O will terminate and prevent compressor operation. This can be used for duty-cycling,

minimizing power consumption during an emergency power period or during sufficiently

low outdoor air temperatures which allow for free cooling –all while maintaining the

heating function.

Unit shutdown (24V AC signal thru A/O). Providing a continuous 24V AC potential to A/O

will terminate and prevent unit operation. This can be used for a night shutdown. On both

arrangements a single 24V AC signal can shutdown many units. ¼ VA is required per unit.

Finally, the board has four analog inputs provided via thermistors. These inputs are as follows:

Ta –Discharge Air Temperature

Tr –Refrigerant Temperature

Tw –Outgoing Water Temperature

Co –Condensate Level

Ta, Tr, And Tw are 10k Ohm NTP thermistors, while Co is a 100 Ohm NPT thermistor. These

Inputs do not have LED indicators.

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

FAN OPERATION

1. A call on “G” for fan on the thermostat terminal strip will cause the fan to operate

continuously on low fan speed through K5 on multi speed units.

2. A call on “W” for heat on the thermostat terminal strip will also cause the fan to

operate on low speed. If the heating call is still present after a 10 minute period, the

multi speed units will switch the fan to high speed through Relay K6.

3. A call on “Y” for cooling on the thermostat terminal strip will cause the fan on multi-

speed units to immediately step up to high speed through Relay K6.

4. Fan operation will terminate whenever all calls are dropped.

5. When the fan is operating at high speed, both relays are energized along with their

associated LED indicators.

HEATING OPERATION

1. A call on “W” for heat will activate the fan at low speed. It will also simultaneously

energize the heat relay K2 and its associated LED. The relay K2 will provide 24V AC fused

power directly to the heat valve.

COOL START UP

1. A call on “Y” for cooling initiates a series of checks prior to the start up of the

compressor. These checks include:

a. Power ON timer –Compressor operation is delayed for approximately 5 minutes

after restoration of power. This prevents all units from coming on line at the

same time when power is restored. It also prevents compressor jolting with

intermittent power.

b. Anti-Recycle timer –There is a 5-minute anti-recycle delay timer that allows the

refrigeration cycle to achieve pressure equalization so that the compressor is

unloaded upon start up.

c. High Pressure Switch –The high refrigerant pressure switch must be closed prior

to start. LED 11 will be ON.

d. Low Pressure Switch –The low pressure switch operates primarily as a loss of

charge protector. It must be closed for compressor start up and its LED 12 will

be ON. The pressure switch has a 5 minute time ignore subsequent to start-up.

In some situations, particularly when the unit is cold, the pressure switch will

open during start-up. If the switch does not remake with the 5 minute ignore

period, the compressor will immediately be stopped.

e. Air temperature sensor Ta –Sensor Ta will prevent compressor operation if the

air flowing through the unit is below 55F (15C).

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

f. Water temperature sensor Tw –Sensor Tw will prevent compressor operation if

the outgoing fluid temperature is above 125F (52C).

g. Refrigerant temperature sensor Tr –Sensor Tr will prevent compressor

operation if the coil temperature is below 40F (4.4C).

h. Any of the above faults will be indicated with the Diagnostic Code described

under the DIAGNOSTICS section.

COOL OPERATION

1. Monitoring of the refrigerant cycle continues during operation of the compressor. The

following malfunctions will cause the compressor to shutdown:

a. If the head pressure exceeds the set point of the high pressure switch, the

switch will open and the control board will terminate the compressor operation

within 10 seconds. At this time a flash code of 6 will be initiated on the red

diagnostic LED 15. Compressor operation will be restored in accordance with the

“Intelligent reset” algorithm.

b. If the suction pressure drops below the set point of the low pressure switch, the

switch will open and if it remains open beyond the 5 minute ignore period after

start up, compressor operation will be terminated within 10 seconds.

Compressor operation will be restored in accordance with the “Intelligent Reset”

algorithm. A flash code of 5 on the red diagnostic LED will be initiated at this

time.

c. Intelligent Reset Algorithm –If a low or high pressure switch opens and remains

open for more than 10 minutes, a hard lockout will be initiated and the cooling

mode will be locked off until the controls are manually reset. At the same time

the fault relay K3 will be set to alarm; however, if the open switch closes within

10 minutes a restart cycle is initiated. The restart cycle begins with a 10 minute

delay after which if there is a cool call in place and all other enablers are within

the start parameters, the compressor will again be put into operation. Should

either of the pressure switches open again, the shutdown procedure will cycle

again, followed by a restart. The intelligent reset will allow two open switch

shutdowns and restarts in a 24 hour period and a third shutdown within 24

hours will put the refrigeration system into a full and hard lockout, requiring a

power down to reset. If two or less switch open shutdowns occur within a 24

hour period, they will be erased from memory and will not contribute to a

future hard lockout. (A hard lockout will prevent compressor operation until the

controls are powered down for at least 20 seconds, and the green power light

goes out. A soft lockout is a compressor shutdown that will be restored once the

condition causing the shutdown returns to normal.)

d. During compressor operation, refrigerant temperature, system fluid

temperature and discharge air temperature are continuously monitored. If the

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

refrigerant temperature drops below 40F, compressor operation will be

disabled. After 10 minutes an auto reset occurs and the compressor will be

enabled as soon as the temperature rises above 65F. Actual compressor restart

will be delayed a minimum of 5 minutes by the anti-recycle timer. A flash code

of 2 will be initiated upon a low refrigerant temperature shutdown.

e. If during compressor operation the condenser leaving temperature rises above

140F, compressor operation will be disabled. After 10 minutes an auto reset

occurs and the compressor will be enabled as soon as the temperature drops

below 120F. The outgoing system fluid sensor is mounted on the leaving fluid

pipe. Actual compressor restart will be delayed a minimum of 5 minutes by the

anti-recycle timer. A flash code of 3 will be initiated upon a high outgoing system

fluid temperature shutdown.

f. If the discharge air temperature drops below 40F, compressor operation will

be disabled. After 10 minutes an auto reset occurs and the compressor will be

enabled as soon as the temperature rises above 55F. The discharge air

temperature sensor is mounted on the fan housing. Actual compressor restart

will be delayed a minimum of 5 minutes by the anti-recycle timer. A flash code

of 4 will be initiated upon a low discharge air temperature shutdown.

g. The condensate level sensor is a 100 ohm thermistor that is heated for 15

seconds every 4 minutes. Its temperature is measured at the beginning of the

heat cycle, and again at the end of the heating cycle. If the condensate level

rises above the sensor it will not warm up during the warm up cycle, and the

temperature change will be insignificant. It is this lack of temperature change

that the controller sees as an impending condensate overflow. When high

condensate level is detected, compressor operation is immediately terminated,

and at the same time the fan is stopped for 30 seconds, and then restarted. At

this time a flash code of 7 will be initiated. The 4 minute cycle will continue until

the cooling call is no longer in place. If the condensate level drops below the

sensor, compressor operation will be returned to normal. However, if the

condensate level stays above the sensor for more than 15 minutes, the fault

alarm will be triggered. This fault signal will automatically reset once the

condensate level goes below the sensor.

Note: The last flash code will be maintained in memory for 1 week or until the unit controls are

powered down. The flash code will continue until the problem has cleared and the compressor has

been put into operation. If a cooling call is in place, it must be disengaged before the cause of the

last alarm shutdown can be identified.

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

OPERATION ALGORITHM

There are several control algorithms to prevent cycling and problematic operation. These are:

1. Double Call –If thermostat connections or set up is incorrect resulting in a simultaneous

call for both heating and cooling, the unit will not operate. This condition can be

observed on the thermostat connection LEDs. (Note: A heat pump thermostat will

present this scenario)

2. Reverse Cycle Call –Poorly located automatic changeover thermostats (i.e. thermostats

mounted on a wall opposite a discharge grill, or a thermostat in a doorway to outside)

can trigger heating and cooling mode changes many times an hour. The CGC controller

has a 10-minute anti-mode change timer for both heating and cooling mode changes.

The controller will not accept a change in mode until 10 minutes have elapsed since

termination of the opposite call.

THERMOSTAT CONNECTIONS

The CGC control board has been designed to operate with most standard 24V AC thermostats.

These are powered from the CGC board with 24V AC and simply switch power ON to each of the

Heat (W), Cool (Y), Fan (G) or Aux (A). While most present day thermostats operate in this manner

there are others that may or may not work properly. The following should be checked out for

satisfactory performance prior to installation:

1. Heat Pump Thermostat –Some heat pump units do not have heat relays (therefore are

not compatible with standard thermostats) and require “Heat Pump Thermostats”.

These thermostats call for both heating and cooling on one of the signal wires. These

thermostats are completely incompatible with CGC’s controller.

2. Battery Powered Thermostats –These thermostats were developed as replacements for

old mercury bulb thermostats that had 4 wire connections while 24V electronic

thermostats required 5 wires. These will work with a CGC board, although CGC does not

recommend them. They require periodic battery replacement, which is something that

should be avoided if possible.

3. Power Stealing Thermostats –This type of thermostat is electronic and was also

developed as a replacement for old mercury bulb thermostats. These too are

problematic in that they bleed a small amount of current down the signal wires and this

may be interpreted as a signal for heat or cool.

4. Triac Switched Controllers –This is a commonly used switching device and all

controllers tested to date have functioned flawlessly. CGC recommends that prior to

installation of a third party supplied controller, it be checked for compatibility. CGC can

confirm this.

5. Relay Switched Controllers –This type of controller works well with CGC devices.

BULLDOG SlimKeeper Hoizontal –Installation Operation Maintenance Manual

SHUTDOWN OUTPUT

The CGC board has an optional input terminal strip that allows for two types of remote shutdown.

These are a) compressor shutdown and b) unit shutdown.

The advantage of these inputs is that many units can be connected in parallel and when powered

by an independent 24V AC signal one or both of these actions can be implemented. Common uses

are:

Duty cycling for demand control

Global night setback

Heating only mode during emergency power periods

The CGC controller is also set up so these shutdown functions can be initiated individually with on

board 24V power. This capability allows unit or compressor shutdown based on a door switch, a

light switch, or occupancy switch. A separate 24V power supply is required if two or more units are

being shutdown.

FAULT ALARM OUTPUT

The CGC board is provided with a fault alarm indication and output. The fault alarm relay

provides normally open and normally closed contacts for use in transmitting fault conditions.

NOTE: The fault alarm is energized for NORMAL, and de-energized for fault. As such, if the unit

is not powered, if the board fuse is blown, or if the electronics are damaged, a fault condition

will be indicated.

The fault relay is paralleled with the Fault LED which will be ON when no fault condition exists.

Other fault conditions are:

Hard lockout due to high or low pressure switch being open for 10 minutes or longer.

Hard lockout due to three high or low pressure shutdowns in a 24 hour period.

High level condensate for a period in excess of 15 minutes.

BULLDOG Horizontal SpaceKeeper –Installation Operation Maintenance Manual

COMMISSION & START UP

System Flushing:

Proper system cleaning and flushing is an important aspect of the commissioning and start up

procedure for BULLDOG units. Ensure the system has been flushed properly. This prevents fouling

of the unit’s heat exchangers. It is common for debris to settle out in areas of the system where

there is low flow or low fluid velocity. This causes nuisance alarms as a result of a fouling heat

pump. It is necessary to flush these units out as they appear to contain debris build up. This is the

responsibility of the contractor and not a heat pump defect.

NOTE: Hydronic coils are not 100% drainable.

System Fluid:

Ensure that system water temperature is within an acceptable range to facilitate start-up (80-

120°F) for cooling and (100 –140°F) 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 BULLDOG unit in operation are acceptable. There is typically an 8 to 12 degree drop or rise

in temperature, depending on whether the unit is in cooling or heating. Under extreme

conditions, slight variances in the temperature may be noted.

Freeze Protection from Water System:

Ensure that freeze protection is provided for the outdoor portion of the loop water system.

Inadequate freeze protection can lead to coil damage.

NOTE: A potential issue may arise during construction where the system fluid loop is drained

after being cleaned, flushed and tested. BULLDOG units will not completely drain and may

hold fluid in the condenser or heating coil. Extensive damage may result to internal

components if the system fluid freezes unless adequate glycol is added.

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.

BULLDOG Horizontal SpaceKeeper –Installation Operation Maintenance Manual

Clean Unit Filters:

Confirm that the unit filters that are being used are clean. This contributes to the proper

operation of the unit by ensuring that there is adequate air flow across the coil.

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

Confirm that the unit filters that are being used are clean. This contributes to the proper

operation of the unit by ensuring that there is adequate air flow across the coil

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.

BULLDOG Horizontal SpaceKeeper –Installation Operation Maintenance Manual

MAINTENANCE

WARNING:

To prevent injury or death due to electrical shock or contact with moving parts, disable the

unit using the disconnect before servicing.

Inspect Filters:

Establish a regular maintenance schedule. Clean filters frequently and replace as required. A

vacuum can be used to clean filters, as well as the surface of coil components.

To remove the filter from the unit lift the filter up and pull it out of the unit at the bottom.

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 until it drops into place.

Check Fan motors annually:

All BULLDOG Heat Pumps are permanently lubricated when shipped from the factory. Do not

oil 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.

Safety Control Reset:

All BULLDOG Heat Pumps 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

continuing use of the unit.

∆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.

UNIT DRAWING

STANDARD WIRING DIAGRAM

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