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BKP 250 - Heat Pipe Technology, Inc.

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1. 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 AC 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 enough 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 BKPO1 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 speci
2. a gt 2 Green G Compressor Black Com 3 Red Red Run E Blue Bue 1 d Start Fan i Capacitor i Black 3 Red a Green i Blue or Green i Yellow Yellow ce ow S ed i m Hi i 2 L 8 Ble 2 U 2 9 com E Blue LP i Blower 3 amp sis gt s Relay 5 Blue 2 Lock Out Blue Blue HP i a Relay I Y2 5 b 1 No NC f 1 I Yellow i Red NN MILLS O e Yellow U DL f I l I 4 REEL er EN na PE ERI E I I bl dees all 9 8 Line Voltage Contact Make On a HP High Pressure Cut Out Control Voltage Rise in Humidity E LP Low Pressure Cut Out Field wired z 20 E BKP 250 450 Wiring Diagram 13 208 230V 60HZ 1PH Babi pres Sop oe Ses pees se tet Y Be ca NS Ra te a ae fe a ata gh 4 Green i Green i Green Ground Black Black i NOTE Unit Wired Red Red E For 230V Operation E A For Operation on 208V White Exchange Red Wire for Orange 1 Orange Wire on 3 j Transformer Transformer Red x 24V Blue Yellow GS or Red m Blue or Green S Compressor x 5 r Contactor og cd 8 S ke 8 Time ao SS o Delay EO 4 S gt B mn P o Green Compressor Black N Com Red L Red Bd Bue Blue Start Fan Black Capacitor Red e Blue or Green Green ad Yellow Yellow G x om x o OW E a Med d a Hi 8 5 E l Blue 3 P 2 9 COM T i Blue LP Blower gt a ed gt i R Relay 5 Blue Blue
3. any safety control unless directed by the 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 readings at the air inlet to the BKP Using thermometers and hygrometers take the dry bulb temperature and relative humidity Possible Cause Solution 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 eee i uu If pressures are still low and there are no bubbles in sigh glass If high press reads high and low pressure is ok or high For AC units if a hissing noise can be herd from the reversing valve feel the check valve on the small tube from the center port If no problems are found unit may be overcharged 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 Reversing valve is leaking by If both of these are OK replace compressor Check if the evaporator coil is frosted up If frost is present allow the frost to melt completely Check hot gas bypass Check fo
4. can be accessed through a separate cover from either side of the unit 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 can be placed as a stand alone unit in an environment such as above the ceiling or in a mechanical room The BKP is designed to operate in conditioned space with temperatures ranging from 60 F to 95 F Special factory options may be ordered for operation above or below these limits 3 1 DUCTING The BKP can be used with suitable metal or fiberglass ducts using approved methods The ducts must be sized appropriately for the airflow listed A good quality air filter of equal or larger size may be installed in the inlet register and located for ease of maintenance The duct must not add more than 0 5 E S
5. 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 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 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 while the BKP runs It wil
6. high static pressure across our dehumidifier coils a 2 inch minimum trap is required Min 2 in ZR NU 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 For Remote Condenser Unit CAUTION Coil is pressurized with a few PSI of nitrogen Punch hole in copper 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 the 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 Model 250 AC 450 AC Liguid 3 8 3 8 Vapor 1 2 1 2
7. 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 250 450 Models 450 Capacity Ibs day at 440 80 F amp 60 RH AHAM Capacity Ibs day at 343 80 F amp 50 RH ASHRAE Air Flow Rate cfm 1000 Operating Range Dimensions WxHxD in 45 x 22 x 22 45 x 22 x 34 Net Weight Ibs 200 290 Filter Size WxHxD in 16x20x2 2 16x16x2 Electrical 60 Hz Voltage Phase 208 230 V 1 ph 208 230 V 1 ph Max Fuse or HACR Circuit Breaker A 30 50 Min Circuit Ampacity A 19 29 Normal Operating Power W 2500 W 3500 W Compressor Scroll Scroll Blower Motor Power hp 1 4 1 2 Condensate Pumps Optional Optional BKP 250 AC 450 AC Models Outdoor Unit 250 AC 450 AC Dimensions WxHxD in 24 x 25 x 20 24 x 25 x 30 Net Weight Ibs 65 95 Air Flow Rate cfm 800 1800 Electrical 60 Hz Voltage Phase 208 230 V 1 ph 208 230 V 1 ph Fan Motor 1 4 1 4 Normal Operating Power W 300 W 300 W 50 Hz models available on custom order Three phase models available on cus
8. 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 Chlorodifluoromethane 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 p
9. 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 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 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 rig
10. this time Is condensate TRAP properly installed o Yes o No 11 L2 L3 L1 208 230 Volt 60 HZ C NOTE L3on C BKP 1000 amp AC only he R Compressor C EN C ap Single Phase Only L M NOTE Blower Speeds Bl p e Nep gt BKP 750 Low Speed BKP 1000 Med Speed BKP 250 350 450 High Speed cap J 208v 230 V Note Unit Wired for 230V Operation For 208V Exchange y Red wire for Orange wire at Transformer 24V m Dehumidistat Thermostat N RED ER E B La o y R ti TD HP LP 5 C 4 J 5 Wu gt YELLOW Cy OY ba 211 1 tO 3 T RV BLACK Sw og l 3 T BKP AC B Blower Relay Field Wired Only C Compressor Contactor Low Voltage HP High Pressure Cut Out LP Low Pressure Cut Out LO Lock Out Relay High Voltage RV Reversing Valve Solenoid TD Time Delay BKP 250 450 and AC Wiring Schematic 12 ARN CU E Nr E E ELM I C D y dod a 7 i Green Green I gt r l Green Ground i Ed Black i Black NOTE Unit Wired P Red s E For 230V Operation S5 Es Red i For Operation on 208V oo White Exchange Red Wire for Orange Orange Wire on 3 Transformer i 2 P X 1 l Transformer Red s 7 x Yellow lue 8 or Re i m Blue i or Green i S Compressor c Contactor 8B 1 L I 8 E x O Time 1 o o i ag E Ko Delay i 5 o
11. 2 Lock Out Blue Blue HP m Relay 12 Nc NO Black Black AN Black Black RV Yellow Black Red Yellow Black I 1 AMA ron PP ety ae ys Oe Y ng YY gyd g gt mas Sg n oe Eee A YA eq 8 QR Sprache tou Line Voltage Contact Make On 2 E igh Pressure Gut Uu Rise in Humidity E E LP Low Pressure Cut Out _ Control Voltage 2s RV Reversing Valve Solenoid 89 Field Wired R and Y Make On GLY BKP 250AC 450AC Wiring Diagram 14 Rise in Temperature Blower L1 Imput Voltage L2 L3 NOTE L3on 3 Phase Units Only A B Compressor b Cap Single Phase Only P wW L d eee 2 NOTE Blower Speeds c Blower M Cap 208 V 230 V BKP 750 Low Speed BKP 1000 Med Speed BKP 250 350 450 High Speed Note Unit Wired for 230V Operation For 208V Exchange TD HP LP re CR et Cones ae Field Wired Low Voltage High Voltage Red wire for Orange wire at Transformer Dehumidistat Thermostat RED Ps ES 7 D OR _ BLACK 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 BKP 250AC 450AC With Cooling Priority Wiring Schematic 15 Yellow GORE ALES TE RE DDE ES OR SF sep IE AOR FES IME ES rq e J 1 Green Green i i
12. I gt n Green Ground se S N n E Black i S S t gt Red I White i Orange TD 1 rd je a y Transformer i Red S 2AV Blue C x Yellow G or Red m Blue or Green 5 7 Compressor vs 5 r Contactor LE I 9 8 Time TO xx Sc SS oO Delay EO S gt 8 ay Black Red te Resp Blue Bue 5 Black Red Blue or Green Black Blue Black NOTE Unit Wired For 230V Operation For Operation on 208V Exchange Red Wire for Orange Wire on Transformer Green Compressor Com Run Start Capacitor Fan Rise in Temperature a Blue LP x 1 Blue Blue Le Cooling Blue Blue HP ral Relay J2 5l E No NC x Black Black x Black Black RV a I Black Red x Yellow Yellow Black l i 1 Eine ECH AD GAL Dd Gn I ND dd DN Fe Ed ie qo i c J E 5 Re are ns Line Voltage Contact Make On 2 5 igh Pressure Cut Ou Rise in Humidity E E LP Low Pressure Cut Out Control Voltage 5 5 RV Reversing Valve Solenoid Field Wired R and Y Make On Se Y Blower BKP 250AC 450AC With Cooling Priority Wiring Diagram 16 Brown Run Capacitor Brown Brown Black Red Head Pressure Control Black Red Green 208 230V 1 Ph 60Hz BKP 250AC 450AC Remote Condenser Wiring Diagram 17 Brown Black Yellow Green Fan Motor 11 B
13. KP 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 Humidistat set above space humidity level If the unit locks out Check if the transformer has 24V see note 1 Check for 24V at lockout terminals 3 amp 2 Check for 24V at lockout terminals 1 amp 3 Check the voltage to unit at the top of contactor 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 starting If no replace the transformer If no make sure the dehumidistat and field wiring are OK If yes Follow Procedure 2 Unit locks out before starting 2 Fan runs but compressor doesn t Possible Cause Solution Check for 24v across time delay If yes wait 5 minutes If compressor does not start replace the time delay Check for 24v at the compressor contactor coil If yes and the contactor does not pull in then replace the compressor contactor If no check wiring Check Voltage at bottom of compressor contactor If no Replace contactor Check for proper voltage at compressor terminals If no Repair wiring from contactor to compressor Compressor is hot Compressor off on in
14. MA N UA L 3 11 2009 INSTALLATION OPERATION amp MAINTENANCE Commercial High Efficiency Heat Pipe Dehumidifier Model BKP 250 Model BKP 250 AC Model BKP 450 Model BKP 450 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 250 250 AC Model BKP 450 450 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 supply air duct flanges Pleated 2 in air filters are standard and
15. P inclusive of both supply and return ducts 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 25 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 s are supplied with a condensate gravity drain outlet For the gravity drain the pipe must have a downward slope for the entire distance to the outside If installed above the ceiling the pipe 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 to prevent outdoor air from being aspirated into the BKP and prevent draining 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
16. al changes are necessary The oil will travel down hill with the vapor to the condenser and return with the liguid refrigerant to the indoor unit Remote Condenser Liguid 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 Units with three phase 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 Fan blower motor is single phase and 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 4 2 24 VAC Control Wiring Units Without Remote Condenser A 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 It is recommended to 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 humi
17. allation 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 The 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
18. dity are controlled A 24V thermostat and a 24V dehumidistat are supplied with the BKP AC 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 weigh 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 liguid 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 mus
19. e someone turn the thermostat up and down as you listen for a definite click in the reversing valve _ BKP If The valve clicks but does not shift replace the reversing valve If the valve does not click replace the solenoid coil 21 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 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 compl
20. er 1 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 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
21. etion 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 determined 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
22. hts 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 Dealer Model No Serial No Type of Product Date of Installation Dealer Installer Name amp Address of Dealer Company You Purchased from Name Address Customer Signature 23
23. ipate 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 Check refrigerant charge as described above To reset the BKP Reset the BKP by either raising and then lowering the dehumidistat setting or by turning the power to the BKP off and then back on Allow 5 minutes for the BKP to restart If the unit locks out again after restart thoroughly check the operation of the BKP 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 H20 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 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
24. ipe 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 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 supp
25. l continue in this mode until its dehumidistat is satisfied NOTE The BKP 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 7 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 to the unit 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 life equipment 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 by either raising and then lowering the dehumidistat setting or by turning the power to the BKP off and then back on If the unit locks out 1 Check the 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 diss
26. ly 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 3 16 tube This tube has a check valve installed in it Any refrigerant in the outdoor condenser will be pulled back through this 3 16 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 3 16 line The indoor coil also has a check valve in the liquid line out The 3 16 line to the suction header provides a smoother transition when shifting A hissing sound for 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 inst
27. r 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 and ductwork External static should not exceed 0 5 Check that air inlet temperatures are not too hot or too humid If the check valve is hot while running then the reversing valve is leaking Shift the unit from heating to cooling several times and then retest If it is still hot replace the reversing valve Recover refrigerant Evacuate and weigh in proper charge For BKP AC 7 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 thermostat If the bulb does not rock over at the current temperature replace the 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 If yes then the reversing valve coil or the valve itself is bad If no check the wiring to the thermostat and to the Do not run the BKP compressor without a cover If you have voltage to the reversing valve coil hav
28. rt 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 Possible Cause Solution Insure inlet air conditions are above 70 F and 45 humidity For BKP AC units check that unit does not shift into cooling if outdoor conditions are less than 50 F If there are bubbles in sight glass just before shut down the unit may have a refrigerant leak If there are no bubbles in sight glass just before shut down Do not run if conditions are too low Do not run in cooling if outdoor temperature is below 50 F if necessary install outdoor thermostat to prevent cooling operation below 50 F Leak check Recover refrigerant and repair Replace filter dryer Evacuate and weigh in charge Replace thermal expansion valve and filter dryer 19 4b Unit shuts down on high pressure Possible Cause Solution Check for proper airflow Replace filter clean coil duct and blower lt If air flow is low check that the coil is not icing up ne and chockar proper Operaliormor tne hot For BKP AC the outdoor fan does not come on at 240 psig in cooling mode because there is no Restore the power power to outdoor condens
29. t 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 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 3 8 in liquid line add 0 8 oz per foot 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 I
30. t will be necessary to fabricate a cover out of cardboard the same size as the front cover use the cover as a template in which a small flap can be cut for observing the sight glass Do not run the unit without a cover 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 The dehumidistat controls the operation of the dehumidifier 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 50 to 60 will provide the best comfort Settings below 50 will make the unit run longer and less economical Settings above 60 which may be required in certain situations will be more economical but may not provide 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
31. ternal 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 Possible Cause Solution If both gauges are below 40 psig the unit has a refrigerant leak O Low pressure gauge below 40 psig and high pressure gauge at saturation pressure is below 250 psig check continuity from wire to terminal 3 of lockout relay If Low pressure is above 40 psig and high pressure No continuity across low pressure cut out No continuity across high pressure cut out the wire between cutouts is open If there is continuity across all cut outs then Repair and recharge the unit Replace thermal expansion valve and filter dryer Remove wire from terminal 5 of lockout relay Continue below If there is continuity replace the lockout relay Replace low pressure cutout Replace high pressure cutout Replace or repair the wire 4 Unit runs a short time then locks out A cardboard cover should be made to replace the front cover Use the front cover for a template Make sure the cardboard lays against the diagonal drip rail on the coil Any leakage of air around the coil will affect the pressure readings Cut a small flap in the cover that can be opened and closed to observe the sight glass Sta
32. tom order Specifications subject to change without notice 10 BKP and BKP AC SERIES TROUBLESHOOTING CHECK LIST Company Phone Job Name Model ff Test performed by Fax Serial Remote Condenser Test Dehumidification Air Conditioning Return Air Flow CFM CFM Return Air Temperature FDB __FWB ___ FDB __ FWB Return Air Static Pressure Negative in WG a Return Duct Size Depth Width 3 Supply Air Temperatures DB FWB J FDB FWB Supply Duct Air Pressure Positive In WG Supply Duct Size Depth Width Condensate after 15 min see Note below High Discharge Pressure Sat Temperature psig F psig F 5 Liguid Line Temperature Sight Glass F SG Clear o F SG Clear o 2 Low Suction Pressure Saturated Temperature psig _ F psg F 2 Suction Line Temperature coil outlet F F Suction Superheat F F g Compressor _____ Volts Amps at outdoor F __Ampsat __ F DB ____Ampsat___ F DB ui Indoor Blower o Lo o Med oHi Volts Amps Volts Amps Outdoor Fan Volts Amps Amps 3 Outdoor Fan Pressure Switch set at pe ca d Vapor Line Length Size ft OD ft __ OD Liguid Line Length Size 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

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