Bulldog security Skv008 Owner's manual

Installation

Operation

Maintenance

BULLDOG SpaceKeeper

Vertical Heat Pump

SpaceKeeper Vertical

Models: SKV008- SKV320

www.bulldogheatpump.com

 
 
 © Copyright 2013 CGC Group Inc. Installation Operation Maintenance Manual is Subject to Change without Notice. Last Modified November 2019 
 
 
 
Table of Contents 
INFORMATION...............................................................................................................................................1 
Handling ........................................................................................................................................................ 1 
Storage .......................................................................................................................................................... 1 
Weight/Dimensions/Clearance .....................................................................................................................2 
INSTALLATION ...............................................................................................................................................5 
GENERAL INSTALLATION CHECK.................................................................................................................... 5 
LOCATION...................................................................................................................................................... 6 
PLACEMENT...................................................................................................................................................6 
PIPING ...........................................................................................................................................................6 
Wiring............................................................................................................................................................7 
UNIT OPERATION ..........................................................................................................................................8 
OPERATION (Detailed).................................................................................................................................11 
FAN OPERATION..........................................................................................................................................13 
HEATING OPERATION..................................................................................................................................13 
COOL START UP...........................................................................................................................................13 
COOL OPERATION .......................................................................................................................................14 
OPERATION ALGORITHM ............................................................................................................................16 
THERMOSTAT CONNECTIONS ..................................................................................................................... 16 
SHUTDOWN OUTPUT ..................................................................................................................................16 
FAULT ALARM OUTPUT ...............................................................................................................................17 
ALTERNATE FUNCTIONS..............................................................................................................................17 
COMMISION & START UP............................................................................................................................18 
MAINTENANCE............................................................................................................................................23 
MAINTENANCE –STANDARD WIRING DIAGRAM........................................................................................24 
 

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 1

INFORMATION

Handling

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

equipment does not sustain any damage. It is recommended that the floor mount unit(s) be

transported individually on a two-wheel cart where size permits.

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 at all times be stored in an upright position with the compressor section down and the

fan section oriented up.

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

Dropping the heat pump 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 SpaceKeeper Vertical –Installation Operation Maintenance Manual 2

REFRIGERANT CHARGE

Unit Model

008

010

012

015

018

020

024

030

036

042

048

060

R410A Charge (oz.)

Unit Model

070

080

100

R410A Charge (oz.)

per circuit

Single circuit - Standard

100

Dual compressors

Weight/Dimensions/Clearance

Weight:

Unit Dimensions:

Models 008 –018 Models 020 –036 Models 042 –060

SKV1

SKV2

SKV3

SKV4

SKV5

SKV6

SKV7

Model

Weight

(lb)

Model

Weight

(lb)

Model

Weight

(lb)

Model

Weight

(lb)

Model

Weight

(lb)

Model

Weight

(lb)

Model

Weight

(lb)

008

150

020

225

042

275

070

590

120

830

180

N/A

280

N/A

010

150

024

245

048

320

080

625

150

850

240

N/A

320

N/A

012

155

030

245

060

350

100

700

015

175

036

245

018

175

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 3

SIDE

CLEARANCE (in)

Front (Compressor/ Fan section)

Filter (Left or Right)

Rear

Opposite Filter Side

* 6” if return is not ducted.

Models 070 –100 Models 120 –150

Models 180 –240 Models 280 –320

Table 1

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 4

Unit Clearance:

The Vertical product requires minimum clearances as indicated in the table below:

SIDE

CLEARANCE (in)

Front (Compressor/ Fan section)

Filter (Left or Right)

Rear

Opposite Filter Side

* 6” if return is not ducted.

Table 2

Vertical SpaceKeeper –Installation Operation Maintenance Manual 5

INSTALLATION

The installation of all vertical units and components and accessories must be in accordance with local

codes and all 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 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.

GENERAL INSTALLATION CHECK

The list below summarizes the steps required to successfully install a BULLDOG SpaceKeeper Vertical

unit.

1. Remove packaging and inspect the unit. Check for shipping damage or material shortage; file a

freight claim and notify appropriate sales representative, if damage is found.

2. Verify the correct model and voltage.

3. Verify 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.

Vertical SpaceKeeper –Installation Operation Maintenance Manual 6

LOCATION

1. Determine floor mount location with clearances

as shown in Table 1 on page 3.

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

temperature surrounding the unit must not be

less than 45°F (7C°). Do not locate the unit in

areas subject to freezing.

PLACEMENT

1. Position the unit ensuring the unit is level.

2. Meet specified clearances to provide room for

removal of all access panels

(see Table 1 for details).

3. Provide access to water shut off valves and

fittings. Provide screwdriver access to the unit

side panels, discharge collar, and all electrical

connections.

PIPING

CAUTION: Piping must comply with all applicable

codes.

1. Install shut off valves at each unit to permit unit

removal.

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

supplied). Supply and return hoses (available

from factory) are fitted with swivel joint fittings

at one end to allow removal for future

servicing.

3. The SpaceKeeper Vertical units are internally

trapped. Do not install another trap on the

condensate pipe that leaves the SpaceKeeper

unit.

Figure 2

Vertical SpaceKeeper –Installation Operation Maintenance Manual 7

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).

Wiring

1. Wire room temperature thermostat to electrical panel as indicated by the wiring diagram.

2. Connect power.

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 8

UNIT 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.

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

heating with a hot water 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 proper

temperature and flow rate.

Fan Operation:

Each heat pump has two-speed fan operation. The fan operates as follows:

LOW Speed -First stage of heating mode (Thermostat Setting: Fan Automatic)

-Fan only operation (Thermostat Setting: Fan On)

HIGH Speed -The second stage of heating mode

-Cooling mode

Standard Heating Operation:

Each heat pump has two stages of heat operation. The compressor does not operate in either stage.

To enable heating operation, Manual Change Over thermostats (MCO) must be set to “Heat” mode.

Automatic Change Over (ACO) thermostats should be set to “Auto” or heat mode. To start heating

operation, the suite temperature must fall below the heat set-point temperature.

The thermostat will automatically stop heating operation once the space temperature rises up to the

heat set-point temperature.

Stage 1 Heating: Fan operates at low speed for 10 minutes with minimal noise in an attempt to

elevate suite temperature to desired level.

Stage 2 Heating: After 10 minutes, if set-point temperature is not reached, fan will

automatically step up and operate at high speed

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 9

Cooling Operation:

Each heat pump has a water cooled refrigeration circuit that operates only during the cooling mode.

To enable cooling operation, MCO thermostats must be set to “Cool” mode. The ACO thermostats

should be set to “Auto” or cool mode. In order for the cooling operation to become activated, the

suite temperature must rise above the cool set-point temperature.

The thermostat will automatically stop cooling once the space temperature drops below the cool set-

point temperature.

Cooling: The fan always operates at high speed during the cooling operation.

The compressor also operates during the cooling operation.

Time Delays:

-Thermostat time delay up to 5 minutes upon initial power up.

-Thermostat time delay up to 5 minutes when switching between heat/cool/off modes.

-Heat pump time delay up to 5 minutes upon initial start up.

-Heat pump time delay up to 5 minutes from the end of a cooling operation to the start of

the next cooling operation.

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 10

Recommendations:

1. Set the thermostat fan to ON for continuous fan operation while your suite is occupied. This

will help to ensure that the temperature is uniform throughout the suite.

2. In order to provide space conditioning while you are away, keep the thermostat system switch

in the appropriate heat or cool mode. The heat pump will not heat or cool if the thermostat

system switch is set to the “OFF” position.

3. When away for a short duration, set the thermostat as follows:

a. Set fan to AUTO

b. Set thermostat to appropriate heat or cool mode (based on seasonal conditions).

c. Set heat or cool set-point to your desired suite temperature (ie. 72°F or 22°C).

4. When away for an extended period, set the thermostat as follows:

a. Set fan to AUTO

b. Set thermostat to appropriate heat or cool mode (based on seasonal conditions).

c. During cooler seasons set your thermostat to a minimum set point of 65°F (18°C)

d. During warmer seasons set your thermostat to a maximum set point of 78°F (26°C)

5. It is recommended that you maintain the same set points throughout the day regardless if you

are in your suite or not. This provides maximum comfort for occupants. If you must adjust the

set-point during the night or during away periods in the day it is recommended that heating

setback be limited to 2 degrees and cooling to 4 degrees. This will help to ensure the unit

operates minimally; preventing your suite from becoming excessively cold or hot.

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 11

OPERATION (Detailed)

CAUTION:

To avoid fouled machinery, extensive unit clean up, and to maintain 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.

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 SpaceKeeper Vertical –Installation Operation Maintenance Manual 12

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

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 board incorporates digital inputs that are opto-coupled to a 24V AC source. These too have amber

LED indicators located near the input locations that light up when the input is closed. These 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, or for minimizing power consumption during a power

failure 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 simple night shutdown. On both

arrangements a single small 24V AC 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 displays.

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 13

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 advance 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.

Note: - 460 and 575 volt units and belt drive units are single speed and K5 is used as a pilot relay

operating a separate fan contactor.

Note: On belt drive units with dual compressors, Relay K6 is used to operate second compressor.

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 are:

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 up. LED 11 will be ON. High pressure switch opens at 600 ± 10 psi and closes at

450 ± 10 psi.

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. Upon

start up, the signal from the low pressure switch is ignored for 5 minutes. In some

situations, particularly when the unit is cold, the pressure switch will open during start-

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 14

up. If the switch does not close within the 5 minute ignore period, the compressor will

immediately be turned off. Low pressure switch opens at 60 ± 3 psi and closes at 90 ± 3

psi.

e. Air temperature sensor Ta –Sensor Ta will prevent compressor start-up if the air

flowing through the unit is below 55F. The sensor will also prevent the compressor

startup or discontinue compressor operation if the air temperature is above 140F and

will reset at 135F. A flash code of 4 will be initiated on the red diagnostic LED 15.

f. Water temperature sensor Tw –Sensor Tw will prevent compressor start-up and trip

an alarm (a flash code of 3) if the outgoing fluid temperature is above 125F and will

reset the alarm at 120F. The sensor will also trip at startup and during operation if the

water temperature is below 55F and will reset at 60F.

g. Refrigerant temperature sensor Tr –Sensor Tr will prevent compressor start-up if the

coil temperature is below 40F and resets at 65ᵒF. A flash code of 2 will be initiated on

the red diagnostic LED 15.

Any of the above faults will be indicated via the diagnostic LED and the appropriate

diagnostic flash code. Please note the temperatures provided might vary by ±5F.

COOL OPERATION

2. 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” (see below).

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

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 15

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 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. During compressor operation, if the condenser leaving temperature rises above 140F,

compressor operation will be disabled. 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. 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 one week or until the unit controls are

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

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 16

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.

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 (ie. 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 when changing from cooling to heating operation. 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

installing:

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.

SHUTDOWN OUTPUT

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual 17

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:

a. Duty cycling for demand control

b. Global night setback

c. 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 in excess of 15 minutes.

ALTERNATE FUNCTIONS

Dehumidification cycle –When provided with an appropriate thermostat/humidistat, as well as

dehumidification software and additional components, the CGC unit will provide space

dehumidification. This is an optional feature.

Two compressor units –All units larger than 5 tons include single speed belt drive fans. Twin tandem

compressors are standard on units 15 tons (SKV180) and larger, and optional on units between 6

(SKV070) and 12.5 (SKV150) ton units. These twin compressor units are controlled individually

through on board relays K4 and K6 (this is a specially programmed board that uses relay K6 to

activate the second compressor, rather than it being used to activate high fan speed). The control

algorithms for these types of units will alternate which compressor is activated first, thereby allowing

for equally distributed wear. Because tandem compressors share a refrigeration circuit, the standard

single compressor algorithms are used to monitor and protect the compressors.

BULLDOG SpaceKeeper Vertical –Installation Operation Maintenance Manual

2014

COMMISION & START UP

System Flushing:

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

procedure for the 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°F

- 120°F) for cooling and (100°F –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.

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.

This manual suits for next models

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