BKP 750 - Heat Pipe Technology, Inc.
Contents
1. Wiring Schematic BKP and AC 12 L2 L3 L1 Input Voltage C P 7 C NOTE L3on FF b 3 Phase Units Only Compressor C i Cap Single Phase Only P P i ee M 1 NOTE Blower Speeds AS SONOR H J BKP 750 Low Speed N L BKP 1000 Med Speed X a ael BKP 250 350 450 High Speed Ca 9 J 208 V 230 V Note Unit Wired for 230V Operation For 208V Exchange X JU LN EAS FN Red wire for Orange wire rg S Uu Se sed at Transformer go a b ES 0 TR ES N 24 V zs Dehumidistat Thermostat P RED a B B D OR Ko 7 PN TD HP LP 4 y 5 M ELLOW S y P dd on a 2 ir FU j 3 LE PACK B Blower Relay Field Wired 4 C Compressor Contactor alina CR Cooling Relay Low Voltaae A HP High Pressure Cut Out 3 SDN LP Low Pressure Cut Out High Voltage LO Lock Out Relay RV Reversing Valve Solenoid TD Time Delay L1 Input Voltage PA PR Compressor Cap Single Phase Only B ye R d KKK Ne L L c Blower 4 L2 37 NOTE L3on 3 Phase Units Only NOTE Blower Speeds BKP 750 Low Speed des Field Wired Low Voltage High Voltage Wiring Schematic BKP AC With Cooling Priority 13 Z BKP 1000 Med Speed o BKP 250 350 450 High Speed C id J 208 V 230 V Note Unit Wired for 230V j l Operation For 208V Exchange x ran PAS SN P Red wire for Orange2. Control power is also sent through a recycle time delay to the compressor contactor The safety shutdowns consist of a high and low refrigerant pressure cutout If either of these cut outs open the current path from the dehumidistat to the contactor is shifted through the coil of the lock out relay The normally closed contact in the lockout relay opens and the normally open contact closes essentially shorting across the coil of the compressor contactor and providing full control voltage to the lockout relay coil The contactor will remain off as long as the lockout relay receives voltage from the dehumidistat Turning the dehumidistat up and then back down mechanically opens the contact in the dehumidistat dropping the power from the lockout relay After reset voltage can now go through the normally closed contact of the lockout relay to the compressor contactor and blower relay provided the safety shutdown has cleared Control power to the contactor will be resumed through the off cycle time delay when the machine has been off for the selected number of minutes factory set to 5 minutes for single phase units 3 minutes for 3 phase units A hot gas bypass valve is installed to prevent coil freeze up The hot gas bypass starts to open if the suction pressure drops below 60 PSIG for any reason and bypasses hot gas directly into the evaporator to prevent the coil temperature from dropping below freezing The refrigerant system is a R 22 Chlo
3. Pressure switch operation does not work Replace the pressure switch Fan motor not running Repair wiring to the motor and or replace the fan motor If pressure is still high unit has probably been overcharged NOTE Proper charge cannot always be Recover all refrigerant and weigh in proper charge determined by refrigerant pressures and the sight glass can show bubbles under normal conditions 5 Unit shuts down occasionally Follow the procedure under 4 unit runs a short time then locks out If unit shuts down follow the outlined procedure An occasional shut down can be a very difficult problem to diagnose It usually involves some trial and error and multiple trips back to solve If everything looks normal while the machine is running consider whether there could be any environmental changes taking place during the day Such as the air conditioning or heating being shut down at night while the BKP runs continuously If it is a BKP AC M the unit could be tripping on cold nights when it shifts to the outdoor condenser These units should be prevented from running in the cooling mode if the outdoor temperature is below 50 F Small trip indicators are available from local AC supply houses to help in diagnosis These are attached across each safety cut out and will tell you which control is shutting the system down This will narrow down the possibilities Do not permanently bypass any safety control unless directed by the
4. aa j z G com o 4 C y VIII D S en 2 3 4k ue Pes Ye v Time HP B 3 S Sm Lock Out o gt Delay 3 eo cg 3 E o Blue SO BRA MS G LP i ES EE a LE NO AC Only Blue Yellow S l m Y E 2 5 HRO D 6 Line Voltage HP High Pressure Cut Out c E Control Voltage LP Low Pressure Cut Out E 25 RV Reversing Valve Solenoid Field Wired Contact Make On Rand Y MakeOn Rise in Humidity Rise in Temperature Wiring Diagram BKP 750 and AC 208 230V Single Phase 14 Green Green M Ground cic JE OJo Ground L1 L gt 208 230V Red L3 3Ph60Hz Black White T Brown Orange Brown i Blue T NOTE o Transformer Wired For o 3 l 230V operation For m T EN ro 208V Operation Swap c NA ent Vs c 5 c c gt Red For Orange Wire es JE L1 L2 L3 From Transformer o ee Al x White Compressor Blower Motor Blower 5E orange Contactor P l l So cyl Red 7 OS Blade E HP Rise in Humidity Rise in Temperature E M ae Black 2 Blue Blue Blue x COM C So z ax 4K Time y Delay L LockOut 29 3 T lt Blue Relay
5. adequate human comfort Units with Remote Condensers The BKP AC with remote condenser is designed to control space temperature as well as humidity Therefore they are controlled by both a dehumidistat and a thermostat This design allows the BKP AC to switch from normal operation to remote condenser operation automatically when extra cooling is needed in the space In the remote condenser mode the BKP ACs dehumidify and provide additional cooling to the space at the same time The thermostat should be set 2 to 3 F below the setting on the building thermostat so that the BKP operation will not interfere with the operation of the building A C The latter will continue to cycle on and off to maintain the building temperature When the building A C cycles off with the lower thermostat setting the BKP continues to run in the thermostat cooling mode until the temperature drops to its onset point The BKP then shifts to its normal mode discharging dry warm air When the temperature rises to its thermostat set point the BKP again shifts to the additional cooling mode Therefore it will cycle back and forth to maintain the inside temperature at its set point and the building A C will not cycle on unless the temperature has risen up to the building s higher thermostat set point In this manner the building A C cycles on only when the cooling by the BKP is not sufficient When the relative humidity is down to the desired setting
6. may be overcharged Recover refrigerant Evacuate and weigh in proper charge For BKP AC T BKP AC runs in either dehumidification or cooling mode only but does not change mode reversing valve does not shift Remove the cover from the thermostat Turn the temperature setting all the way up then all the way down Observe the mercury in the glass bulb If the mercury does not move from one end of the bulb to the other replace the thermostat If the bulb does not rock over at the current temperature replace the thermostat Remove either wire from the time delay to keep the compressor from starting With the thermostat all the way down check for 24 V at the reversing valve coil Do not run the BKP compressor without a cover If you have voltage to the reversing valve coil have someone turn the thermostat up and down as you listen If yes then the reversing valve coil or the valve itself is bad If no check the wiring to the thermostat and to the BKP If The valve clicks but does not shift replace the reversing valve for a definite click in the reversing valve 21 If the valve does not click replace the solenoid coil BKP and BKPool Series Packaged Dehumidifier Twelve Month Limited Warranty Subject to the following conditions Heat Pipe Technology Inc HPT warrants this product to be free from defects in material and workmanship for a period of TWELVE MONTHS from the date
7. the BKP AC will shut off and the building will be back to its normal A C operation During the wintertime when the space must be heated the BKP s thermostat should be set 2 to 3 degrees above the main heating thermostat This will use the BKP s normal dehumidifying operation mode to provide additional heating to supplement the building s heating system It will continue in this mode until its dehumidistat is satisfied NOTE The BKP AC is not designed to cool when the outdoor temperature is below 50 F Refrigerant Migration will occur and the unit will shut down on low pressure 7T MAINTENANCE It is essential that the air filter on the inlet of the unit be kept clean in order to prevent excessive power consumption and possible damage Check the filters routinely to determine the frequency of replacement Keep the outdoor remote condenser free of leaves and grass clippings which may impede air flow Check condensate drain regularly to ensure that the condensate is draining properly If installed with an auxiliary drain pan under the unit check that it is dry It is recommended that the BKP be serviced annually by an authorized HPT certified technician to provide maximum efficiency and insure long equipment life 8 SERVICE DIAGNOSIS The BKP is equipped with safety controls which will shut down the unit if a problem occurs The BKP will remain locked out until it is reset If The Unit Locks out 1 Check the
8. MANUAL INSTALLATION OPERATION amp MAINTENANCE Commercial High Efficiency Heat Pipe Dehumidifier Model BKP 750 Model BKP 750 AC Model BKP 1000 Model BKP 1000 AC Model BKP 1250 Model BKP 1250 AC Heat Pipe Technology Inc 4340 N E 49 Avenue Gainesville FL 32609 Tel 352 367 0999 Fax 352 367 1688 http www heatpipe com E mail heatpipe heatpipe com Model BKP 750 750 AC Model BKP 1000 1000 AC Model BKP 1250 1250 AC INSTALLATION OPERATION amp MAINTENANCE 1 GENERAL DESCRIPTION The BKP s are commercial high efficiency dehumidifiers They are radically different from other dehumidifiers because of the proprietary heat pipe used to exchange heat between the warm intake air and the cold air discharge from the evaporator This process pre cools the incoming air and allows more moisture to be condensed for less energy spent The heat pipes are passive devices that use no energy The BKP standard unit comes pre charged with refrigerant The BKP AC model is shipped in two sections which must be piped together evacuated and then charged as a unit The BKP AC models which are equipped with outdoor remote condensers will also work as an air condition system to reject heat to the outdoors The BKP comes with a dehumidistat and a thermostat AC models for the unit with outside remote condenser Condensate water is removed by gravity drain The unit comes with an intake and suppl
9. air filter in the inlet of the unit A dirty air filter will cause an increase in power consumption and in the long run may cause damage to the unit 2 Check the remote condenser If the air is blocked or the hot air discharge is not free to dissipate a high discharge pressure will result and may cause damage to the BKP 3 Check the power supply to the remote condenser It will be on a separate breaker and if tripped will cause the BKP to shut down 4 f the problem cannot be determined have the unit serviced by a qualified service technician See troubleshooting guide below To reset the BKP Reset the BKP by either turning the humidistat all the way up and then back down or turning the power to the BKP off and then on Allow 5 minutes for the BKP to restart If it locks out again after restart have the unit serviced by a qualified service technician to determine the cause of the shutdown and correct the problem See troubleshooting section below 9 Sequence of Operation for Standard Unit The BKP is controlled on or off by a dehumidistat which senses the relative humidity of the space The BKP units have a remote mounted dehumidistat and are designed to be used with a duct system having a total external static of 0 5 in H2O or less On a call for dehumidification the contact in the dehumidistat is made sending control power through the safety shutdown switches through the lockout relay and to the blower relay
10. ded and could fail pre maturely The ducts must not add more than 0 5 E S P inclusive of both supply and return ducts A high efficiency 2 pleated air filter is located in the air intake and is accessible through a separate cover for ease of maintenance When the BKP is used to handle outside fresh air a branch of the intake can be ducted to outside The BKP is designed to handle as much as 259e fresh air and will remove most of the moisture from the air before admitting it to the building Additionally the supply dry air can be ducted or injected to the supply duct of the main air handler for a building providing the back pressure from the main air handler does not reduce the air flow through the BKP The blower of the main air handler may also need to be interlocked to the BKP so that the blower runs when the BKP runs to distribute the air A back draft damper will also be needed for the BKP to prevent the main AC from blowing back through the BKP when it is not running 3 2 Condensate Drain The BKP is supplied with a condensate gravity drain For the gravity drain the pipe must have a downward slope for the entire distance to the outside If installed above the ceiling the unit should be installed above a secondary drain pan Drain piping must be supported every 3 or 4 feet to prevent sagging If the line has any level runs or dips it will not drain properly Ensure that the drain line has a trap preferably at the lo
11. dehumidistat is supplied with the unit It should be placed in the conditioned space away from heat sources entrance doors or any sources of humid air Do not mount it directly on the side of the unit as the vibration may adversely affect it Place the dehumidistat at a location where it could sense the average relative humidity of the space The dehumidistat is of the 24 V type and should be wired with T stat 18 gauge low voltage wire See wiring diagram in unit control panel Units with Remote Condensers For operation of units with a remote condenser both temperature and humidity are controlled A 24V thermostat and a 24V dehumidistat are supplied with the BKP Wire the controls with Thermostat 18 gauge low voltage wiring in accordance with the wiring diagrams NOTE The operation of the remote condenser is by an internal pressure switch No control wiring is needed to the outdoor condenser 5 Charging The BKP The BKP is charged with refrigerant 22 The charge amount is listed on the nameplate It is important to have exactly the right charge in the unit or damage to the compressor or refrigerant components may occur Due to the wide range of operation of the BKP it is highly recommended that the charge be weighed in to the ounce 5 1 Standard Unit Standard units Non AC Models are factory charged and ready to run after installation and wiring If the charge is in question first recover the refrigerant in the system and we
12. e hot gas line might cause harmful burn Solder the connections with suitable silver brazing alloy and leak check An additional Refrigeration charge will have to be added to the nameplate charge depending on the liquid line size and length See section 4 Charging the BKP Table BKPO1 nea Tana 1000 AC 1250 AC Vapor Line OD 5 8 3 4 7 8 Liquid Line OD 1 2 5 8 5 8 Note This BKP AC remote line sizing applies to most applications up to 50 feet horizontal and within 10 feet vertical ACR OD line sizes 3 41 Long Line Sets 50 ft or Longer For line sets where there are no vertical sections greater than 10 ft and for lengths up to 150 ft increase the vapor line one size larger but leave the liquid line size as is Also add 4 extra ounces of refrigerant oil 3GS or Equivalent to the system for every 50 ft over 50 ft 3 42 Vertical Line Sets When the BKP remote condenser is installed either on a roof above the BKP Unit or on the ground where the BKP unit is on an upper floor or attic special consideration needs to be taken to insure that Oil will return to the compressor Unlike a split system air conditioner the compressor is in the indoor unit If the remote condenser is above the indoor unit special P Traps need to be installed in the vapor line at the bottom of the vertical section and every 10 ft above that Small particles of oil that circulate with the Vapor will accumulate in the traps until they are large eno
13. et Weight bs 260 i Flow Rate CFM 6000 Vapor Line Connection in 5 8 3 4 7 8 iquid Line Connection in 1 2 5 8 5 8 Electrical 60 Hz Voltage Phase 208 230V 1 ph 208 230V 1 ph 208 230V 1 ph 50 Hz mode 50 Hz models available on custom order Three phase models available on custom order Specifications subject to change without notice 10 BKP and BKP AC SERIES TROUBLESHOOTING CHECK LIST Company Phone Fax Remote Job Name Condenser Model Serial Test performed by Date Test Dehumidification Air Conditioning Condensate see Note Condensate see Note below High Discharge Pressure Sat Bios Suction Pressure Saturated emperature Compressor Volts Amps at Amps at F DB Amps at F DB outdoor F Indoor Blower Lo Med Hi Volts Amps UU EE _ Outdoor Fan Volts OutdoorFan Voits Amps Amps _ psig Outdoor Fan Pressure Switch set at si d _ LL PSIQ Vapor Line Length Size Q Vapor Line Vapor Line Length Size Size OD Liguid Line Length Size OD Note To perform condensate flow test run the unit for 15 minutes then capture condensate for 5 minutes in a graduated container Air side conditions must be measured during this time Is condensate TRAP properly installed O Yes O No Elec Refrigerant 11
14. event shall HPT be liable for any special indirect incidental or consequential damages of any character including but not limited to loss of use of productive facilities or equipment lost profits property damage transportation installation or removal lost production or personal injury whether suffered by Purchaser or any third party HPT disclaims all liability for any and all costs claims demands charges expenses or other damages either direct or indirect incident to personal injury or property damage arising out of any cause of action based on strict liability JI ow J gt Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts so the exclusion or limitation above of consequential damages or the limitation of time above on implied warranties may not apply to you This warranty gives you specific legal rights and you may have other rights which may vary from state to state 22 Warranty Registration To insure your warranty protection please fill in the Warranty Registration form and mail or fax it to Heat Pipe Technology Inc 4340 NE 49 Avenue Gainesville FL 32609 Fax 352 367 1688 WARRANTY REGISTRATION FORM Customer Name Customer Address Phone Fax Please Check One Homeowner L Dealer Model No Serial No Type of Product Date of Installation Dealer Installer Name amp Address of Dealer Compa
15. factory 20 6 BKP runs but does not dehumidify Follow the procedure in 4 unit runs a short time then locks out to observe sight glass while running the BKP M Using thermometers and hygrometers take the dry bulb temperature and relative humidity readings at the air inlet to the BKP V Possible Cause High and low pressure gauges did not move when the unit comes on If the compressor runs but low pressure reads too high and high pressure reads too low If the compressor runs but both low and high pressure reads low If pressures are still low and there are bubbles in the sight glass the unit may have a refrigerant leak If pressures are still low and there are no bubbles in sigh glass If high press reads high and low pressure is ok or Check compressor wiring and capacitor If compressor is hot allow to cool OHM compressor to determine winding condition Replace compressor Check if the hot gas bypass is leaking by Check if the evaporator coil is frosted up If frost is present allow the frost to melt completely Check hot gas bypass Check for leak recover refrigerant repair leak replace filter dryer evacuate and weigh in proper change Replace thermal valve and filter dryer Check airflow through the unit If it is low check filter high and ductwork External static should not exceed 0 5 Check that air inlet temperatures are not too hot or too humid If no problems are found unit
16. forth between indoor and outdoor condenser until the dehumidistat is satisfied The thermostat gets its control power from the red wire going to the dehumidistat On a drop in temperature the thermostat contact sends control power directly to the reversing valve coil The outdoor condenser is powered from a separate power supply No control voltage wiring is connected A head pressure switch inside the outdoor condenser controls the fan The fan comes on when the pressure in the outdoor coil reaches 240 psig and shuts off when it drops below 190 psig The refrigerant flows from the compressor to the reversing valve inlet In the de energized state the flow is sent to the indoor condenser The line going to the outdoor condenser is internally connected to the reversing valve s center suction port which is connected to the suction line coming out of the evaporator by a 1 4 tube This tube has a check valve installed in it Any refrigerant in the outdoor condenser will be pulled back through this 1 4 tube as the compressor runs A check valve in the leaving liquid line of the outdoor condenser prevents refrigerant from being pulled backward through the condenser coils When the reversing valve shifts to the outdoor condenser the indoor condenser is connected to the suction by the 1 4 line The indoor coil also has a check valve in the liquid line out The 1 4 line to the suction header provides a smoother transition when shifting A hissing sound f
17. he contact will open if line voltage on any phase drops by 10 of the adjusted line voltage setting or an unbalance of 4 occurs between phases The contact will open to drop the 24 V control power to the control system 9 22 Cooling Priority Relay Units with a cooling priority relay will energize the BKP in the cooling mode on a call for cooling from the thermostat even if the dehumidistat is satisfied Control voltage from the thermostat to the reversing valve is used to energize the cooling relay Normally open contacts 2 and 4 close to supply control power directly from the transformer to the yellow wire coming from the dehumidistat When the thermostat is satisfied the BKP will shut down again 10 SPECIFICATIONS BKP 750 1000 1250 BKP 750 AC 1000 AC 1250 AC Capacity Ibs day at 80 F amp 6096 RH AHAM s a as Capacity Ibs day at 80 F amp 5096 RH ASHRAE ER 748 975 Air Flow Rate CFM 1200 1600 2000 Operating Range All models can operate from 60 F 100 RH to 95 F 55 RH Dimensions WxHxD in 34 x 70 x 28 34 x 70 x 33 34 x 70 x 40 Net Weight Ibs 500 550 750 Filter Size WxHxD in 2 20x25x2 2 20x25x2 4 16x20x2 Electrical 60 Hz Voltage Phase Standard 208 230V 3 ph Max Fuse or HACR Circuit Breaker Amps Min Circuit Ampacity Amps Normal Operating Power W 9600 W Compressor 108 000 BTU Scroll Blower Size HP BD12X12 1 1 2 Condensate Pumps Optional Dimensions WxHxD i N
18. igh in the proper charge If it is determined that the unit has a refrigerant leak the leak must be repaired Even though the unit appears to operate as the refrigerant level drops the compressor will over heat and be damaged before the condition is recognized Repair the leak and replace the liquid filter dryer Evacuate the system using a Micron Gauge down to 400 microns Valve off the vacuum pump and insure the vacuum does not rise above 700 microns Then weigh in the charge using a scale accurate to 1 once 5 2 AC Unit The BKP AC model is shipped in two sections which must be piped together evacuated and then charged as a unit Evacuate the refrigerant system to 400 microns or below Valve off the vacuum pump and insure the micron level does not increase above 700 microns For BKP AC units the system must be evacuated from all three ports This is due to the check valves used in the remote condenser A 1 4 in flair Tee and an extra refrigeration hose can be used to double up the discharge hose Remove the extra hose from the remote condenser tap after charging and before running the unit Weigh in the refrigerant charge using the suction and discharge ports The proper charge of refrigerant 22 for the unit and the remote condenser can be found on the nameplate It is important to have the proper charge of refrigerant The preferred method of charging is to weigh in the charge from the nameplate with a scale which can be accurate to plus or
19. m m f LP Bue y2 9 M4 No NC AC Only Blue Yellow sa SE o S RO l D o Line Voltage HP High Pressure Cut Out E E Control Voltage LP Low Pressure Cut Out D E Y Field Wired RV Reversing Valve Solenoid 3 2 PLM Phase Loss Monitor Contacts Make On S R and Y Make On 15 Wiring Diagram BKP 750 and AC BKP 1000 and AC 208 230V 3 Phase Blower Motor Fe Green Green Black White Orange Red 5 Yellow EH NEN NE NEN NEN EU DS DS EU NES OS EU OU UU DS UN ON EN es I I I I I I l L i EUR eye enter ER TUS L4 Lo 208 230V ba Ph 60 H II I ge mu um mm um um L3 3 Z 1 1 i i NOTE i Transformer Wired For 230V operation For Cy CS a 208V Operation Swap d Red For Orange Wire L1 L2 L3 From Transformer Compressor Contactor N Black Yellow Coq E X 1 3 Lae E21 E38 2 Blower o m Contactor 2 PA 2 ot ES Se g c Rise in Humidity Compressor X L3 Se E Red Yellow z AC Only Black Black Black E Blue Blue CU Back TOUT Blue Blue RV Black 2 S K 3 2 3 M COM K ml t Time V 8 Delay LocOut 9 9 9 2 Relay m m gH ae NC AC Only Blue J Yell
20. mined by the price schedule in effect at the time of submission of warranty claim Repair or replacement parts will be furnished F O B factory in all cases If HPT elects to replace or provide a refund the defective product must be returned to HPT free and clear of liens or other encumbrances Limitations on Liability This warranty does not cover and no warranty is made with respect to Failures not reported to HPT within the period specified above Failures or damage due to misapplication misuse abuse improper storage or handling abnormal conditions of temperature water dirt corrosive substances or other contaminants Products which have been repaired with parts or materials not furnished or approved by HPT or by its authorized dealers or representatives or products which have been in any way tampered with or altered and Products damaged in shipment or storage or otherwise without fault of HPT Failure of the product resulting from modifications to the product or due to unreasonable use including failure to provide reasonable and necessary maintenance Failure due to corrosion on models not corrosion protected Damage to the product caused by improper power supply voltage accident fire floods or acts of God WARRANTOR IS NOT RESPONSIBLE FOR CONSEQUENTIAL DAMAGES HPT total responsibility for any claims damages losses or liabilities related to the product covered hereunder shall not exceed the purchase price of such product In no
21. minus one ounce Additional refrigerant needs to be added for the length of the line set The liquid line the smaller line is full of liquid in both the heating and cooling modes of operation Measure the length of the line set one way and add to the charge as follows 1 2 in liquid line add 1 5 oz per foot 5 8 in liquid line add 2 5 oz per foot 5 3 Alternate Charging Method NOTE This method will only work if enough load can be maintained on the BKP that the suction pressure does not fall below about 65 PSIG while charging It will be necessary to remove the filter access cover to observe the sight glass Do not run the unit without the main covers in place With the BKP turned off charge the unit with liquid until the unit can be run without shutting down on low pressure Start the unit in the heating mode and charge vapor into the low side port until the sight glass almost clears Run the unit for 15 minutes and then slowly add vapor until the sight glass just clears 6 OPERATION Units Without Remote Condenser Set the dehumidistat at the desired level the dehumidifier will run and remove humidity until the set humidity is reached at which time the dehumidifier will shut off For normal operation a range from 5096 to 60 will provide the best comfort Settings below 50 will make the unit run longer and be less economical Settings above 60 which may be required in certain situations will be more economical but may not provide
22. ny You Purchased from Name Address Customer Signature 29
23. of installation not to exceed 90 days from date of shipment This warranty is in lieu of all other warrants not expressly set forth herein whether expressed or implied by operation of law or otherwise In the event this product fails under normal use and service within the applicable period HPT will correct repair or at its sole discretion replace the defective product or refund the purchase price of products which are returned freight prepaid to HPT for inspection when accompanied by proof of purchase and written claims of defect and which upon inspection by HPT do comply with the terms of this warranty This warranty applies to the first retail buyer and extends to any subsequent owners of the systems Additional Three Year Limited Warranty On Compressor Packaged Equipment Only Additionally HPT warrants the COMPRESSOR to perform under normal use and conditions for a period of THREE YEARS from the date of completion of installation not to exceed 90 days from date of shipment when installed in accordance with factory instructions and recommendations In the event the compressor malfunctions or fails to perform during this warranty period HPT will repair or at its option replace the compressor at the pro rated schedule of cost shown below Percentage of repair or replacement cost paid by Heat Pipe Technology Inc Month of Claim Percentage 1 12 100 13 24 66 25 36 33 The cost of replacement parts or components shall be deter
24. or 10 to 20 seconds is normal while the machine equalizes after shifting The BKP AC also has a liquid receiver in the common liquid line If the BKP AC is installed in an application where it may need to run in the winter when outdoor temperatures will be below freezing special provisions need to be made in the installation An outdoor thermostat must be installed to prevent the BKP AC from shifting to the outdoor mode when temperatures are below 50 F If the unit is allowed to shift to the outdoor condenser when the temperature is below that of the evaporator temperature the compressor will not be able to pull the refrigerant back when it shifts to the indoor coil and the unit will shut down on low pressure A check valve in the liquid line and in the small suction return line prevent refrigerant from migrating to the outdoor coil during cold whether while the unit operates in the Heating Mode 9 2 OPTIONAL EQUIPMENT 9 21 Phase Loss Monitor for Three Phase Units Units with a Phase loss monitor are provided with fuses which feed the phase loss monitor and the control transformer The monitor has an adjustable setting for operating voltage which determines the trip settings This voltage must be set at startup to the measured line voltage This monitor samples the voltage between all three phases and closes a set of normally open contacts when the voltage and phase rotation is correct A red LED lights up to indicate the contact is closed T
25. or doesn t If yes wait 5 minutes If compressor does not start replace the time delay If yes and the contactor does not pull in then replace Check for 24v at the compressor contactor coil the compressor contactor If no check wiring Check Voltage at bottom of compressor contactor If no Replace contactor Check for 24v across time delay Check for proper voltage at compressor terminals If no Repair wiring from contactor to compressor Compressor is hot Compressor off on internal overload Let it cool down Check capacitor Replace if bad Check compressor ohms Replace if bad 18 3 Unit locks out before starting Turn power off to unit for this section Put gauges on high and low refrigeration ports If both gauges are below 40 psig the unit has a refrigerant leak Low pressure gauge below 40 psig and high pressure gauge at saturation pressure If Low pressure is above 40 psig and high pressure Remove wire from terminal 5 of lockout relay Continue Repair and recharge the unit Replace thermal expansion valve and filter dryer is below 250 psig below check continuity from wire to terminal 3 of lockout relay No continuity across low pressure cut out Replace low pressure cutout No continuity across high pressure cut out Replace high pressure cutout If there is continuity across all cut outs then the wire between cutouts is open If there is continuity replace the lockout relay Replace or repair
26. ow l e o O9 gt Sg ee n em v di E SRO i O Line Voltage HP High Pressure Cut Out S Control Voltage LP Low Pressure Cut Out D E Y O _____ Field Wired RV Reversing Valve Solenoid A Contacts Make On Rand Y Make On Rise in Temperature Wiring Diagram BKP 1250 and AC 208 230V 3 Phase 16 Run Capacitor Brown Brown Black Red Head Pressure Control Black Red Green Green 208 230V 1 Ph 60Hz Black Yellow Green Wiring Diagram BKP Remote Condenser 17 11 BKP TROUBLESHOOTING Follow each applicable section in order from top to bottom Note 1 Acceptable control voltage range 22 volts to 30 volts 1 The unit does not start Possible Cause Solution No power to the unit Check the voltage to unit at the top of contactor Humidistat set above space humidity level Lower the humidistat setting Reset the BKP by turning the dehumidistat up and then down then wait for time delay If the BKP locks out again Follow Procedure 3 Unit locks out before If the unit locks out starting Check if the transformer has 24V see note 1 If no replace the transformer Check for 24V at lockout terminals d amp 2 AN make sure the dehumidistat and field wiring are If yes Follow Procedure 2 Unit locks out before Check for 24V at lockout terminals 1 amp 3 dm starting 2 Fan runs but compress
27. rodifluoromethane system consisting of a compressor condenser coil sight glass filter dryer Thermal expansion valve and an evaporator with dehumidifier heat pipes The coil section contains both the evaporator and condenser coils The airflow enters through the precool heat pipe then through the evaporator then the reheat heat pipe and the condenser 9 1 Remote Condenser Units The BKP AC series operates similar to the standard unit except that it has a liquid receiver and employs a separate outdoor condenser Since the standard unit discharges air through the condenser coil the discharge air temperature will always be warmer than the inlet air and can reach temperatures above 100 F The BKP AC unit on the other hand has an outdoor condenser as well an indoor condenser These units use a separate remote mounted thermostat along with the dehumidistat to control the BKP AC The dehumidistat operates the unit on and off as described above The thermostat controls a reversing valve that diverts the refrigerant flow between the indoor and outdoor condensers When the temperature is below the set point the valve sends the refrigerant through the indoor condenser This has the effect of warming the space temperature When the temperature is above the set point the valve sends the refrigerant through the outdoor condenser The BKP AC then acts as an air conditioner bringing the space temperature back down The BKP AC will switch back and
28. the wire 4 Unit runs a short time then locks out Remove the Filter Cover to observe the sight glass Start unit and observe the refrigerant pressures The low pressure cutout is 15 psig The high pressure cutout is 350 psig If the unit tries to shut down on the low pressure switch try to observe the sight glass just before it shuts down Do not run the unit with the cover s off 4a Unit shuts down on low pressure Insure inlet air conditions are above 70 F and 45 humidit NN For BKP AC units check that unit does not shift Do not run in cooling if outdoor temperature is below into cooling if outdoor conditions are less than 50 F if necessary install outdoor thermostat to prevent Do not run if conditions are too low 90 F cooling operation below 50 F If there are bubbles in sight glass just before shut Leak check Recover refrigerant and repair Replace down the unit may have a refrigerant leak If there are no bubbles in sight glass just before shut down Replace thermal expansion valve and filter dryer 19 4b Unit shuts down on high pressure Check for proper airflow Replace filter clean coil duct and blower Let ice melt and check for proper operation of the hot gas bypass If air flow is low check that the coil is not icing up For BKP AC 5 the outdoor fan does not come on at 240 psig in cooling mode because there is no Restore the power power to outdoor condenser
29. ugh to be carried up the pipe by the velocity of the refrigerant Vertical sections of tubing should not be enlarged beyond that specified in table BKPO2 Pre manufactured traps are available at the air conditioning supply houses or traps can be made up using long radius ells of the same size as the tubing If the remote condenser is below the indoor unit no special changes are necessary The oil will travel down hill with the vapor to the condenser and return with the liquid refrigerant to the indoor unit Remote Condenser lt Vapor Line Liquid Line BKP Indoor Unit Fig 3 42 P Traps must be added to vertical lines over 10 ft where remote condenser is higher than the indoor unit 4 ELECTRICAL WIRING CAUTION Three Phase Model BKPs Have Three Phase Scroll Compressors These compressors can be damaged by running backward Verify correct compressor rotation by observing refrigerant pressure gauges at startup Little or no gauge movement indicates reverse rotation Reverse any two leads in the power junction box Note Blower motor in BKP 750 and BKP 1000 is single phase and direction is not affected by lead connections 4 1 Power Supply Use properly sized wire Install and connect unit in accordance with local codes Unit must be grounded Size separate circuits to the BKP and to the Remote Condenser Condensers are single phase unless special order 4 2 24 VAC Control Wiring Units Without Remote Condenser A
30. w end of the drain to prevent outdoor air from being aspirated into the BKP due to the negative pressure inside the unit A proper trap is required for the condensate to drain properly If the piping goes underground and back up outside this is considered an adequate trap Do not double trap This may prevent the condensate from draining due to the air pocket between two traps Due to the high static pressure across our dehumidifier coils a 2 inch minimum trap is required 2N This will not Drain Fig 3 2 Condensate Trap For installation above the ceiling or above the ground floor it is recommended that the BKP be installed over a separate drain pan which is piped to a separate drain point 3 3 Units with a Remote Condenser Install the remote condenser in an outdoor well ventilated and preferably well shaded area Ensure that the hot air discharge is not obstructed Install on a concrete pad or as required by local codes CAUTION The Condenser Coil is pressurized with a few PSI of nitrogen Punch a hole in the copper cap to relieve pressure before cutting off end to connect line 3 4 Condenser Piping The BKP with remote condenser is shipped with a holding charge of dry nitrogen Release the pressure before un sweating the caps from the tubing connection Connect the BKP to the remote condenser using refrigerant tubing of the sizes listed in Table BKP01 The tubing needs not be insulated except in exposed areas where th
31. wire E at Transformer CO uu Ko y bos A OR fe S 24V a Dehumidistat Thermostat Bee RED yN p B y C J R OR P TD HP LP 29 4 R AFELLON e C E Lu Y 2 0 ad 43 y BLACK K x ce B Blower Relay C Compressor Contactor CR Cooling Relay HP High Pressure Cut Out LP Low Pressure Cut Out LO Lock Out Relay RV Reversing Valve Solenoid TD Time Delay Green VERDE NE EHE Green 7 i Green i o T 1 o o E i olo 1 L L i i d 1 i L l L I j L Ground nanna LT HES 1 mai md m un dad md Un E mud ad ud lag 1 d L2 Ph 60 Hz Red I Black i Brad White D Brown Orange i Blue i NOTE I 1 Transformer Wired For S 6 230V operation For CE AN VAS 208V Operation Swap o cl r N le Red For Orange Wire 2a o o o L1 L2 From Transformer as oo Il 5 i Oo 3 6 o Ju SR AMIE Compressor Blower Motor Blower GE Orange Contactor ae Be Green 2 E8 Red a J S Brown Rela mA EE Z z T l y NLO c N Black Brown Com 1 na ll E a gt Black x Blue __ Sl 2 Red m 2 oy Y Yellow Compressor 2 a B Green a Y Black l z o o 2
32. y air duct flanges Pleated 2 in air filters are standard and can be accessed through a separate cover 2 INSPECTION All HPT products are carefully tested and inspected prior to shipment Each unit is in good working condition when packaged If the package is damaged in any way check the contents immediately note damage on shippers Bill of Lading and have him her sign your statement to insure prompt claim processing Notify the carrier immediately of the damage so he can come out and inspect the product and packaging The carrier alone is responsible for handling and settling your claim HPT will cooperate in assessing damage if unit is returned to the factory prepaid Unpack the unit The following will be included BKP dehumidifier dehumidistat thermostat for the unit with outside remote condenser user s manual and warranty card 3 INSTALLATION The BKP s can be placed as a stand alone unit in an environment such as above the ceiling or in a mechanical room The BKP s are designed to operate in conditioned space with temperatures ranging from 60 F to 95 F Special factory adjustments may be ordered for operation above or below these limits 3 1 Ducting The BKP s can be used with suitable metal or fiberglass ducts using approved methods The ducts must be sized appropriately for the airflow listed If a supply duct is not used some method of back pressure on the blower must be supplied or the blower motor will be overloa
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