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The Power Venter must be installed by a qualified installer in accordance with these instructions and all local codes or in their
absence in accordance with the latest edition of The National Fuel Gas Code (NFPA #54), the latest edition of the National Electrical
Code (NFPA#70) and the Occupational Safety and Health Act (OSHA) when applicable.  Improper installation can create a hazardous
condition such as an explosion, fire, electrical shock or carbon monoxide poisoning resulting in property damage, personal injury or
death.

Disconnect the power supply when making wiring connections or when working around the fan wheel and motor.  Failure to do so can
result in electrical shock, personal injury, death or property damage.

1. “Qualified Installer” shall mean an individual properly trained and licensed

2. The installer must write or imprint name, phone number, date of installation and sign in the appropriate space on the Power Venter 

nameplate.

3. Plan the vent system so that Code required distances are maintained from plumbing and wiring.

4. The Power Venter

motor shaft must be mounted horizontally

to ensure proper operation of the Fan Proving Switch and prevent 

motor bearing wear.

5. Make certain the power supply is adequate for the fan motor requirements.  Do not add the Power Venter to a circuit where the 

total load is unknown.

6. The installer must verify that the BTU/hr. input of the appliance does not exceed the recommended input of the GPAK.  See selec-

tion table on page 1 of these instructions for sizing information.

7. Flue gas temperatures must not exceed 600 degrees F. at the Power Venter inlet.  Ambient temperatures must not exceed 104 

degrees F.  Temperatures above this range can cause a fire resulting in property damage, personal injury or death.

8. A safety inspection of an existing appliance must be performed before installation of the GPAK as outlined in ANSI Z223.1/NFPA 

#54, Appendix H, see top of page 4.

9. The electrical load controlled through the Fan Proving Switch must not exceed the electrical ratings marked on the Fan Prover.

INSTALLER NOTES

1. The installer must read and follow these instructions carefully to assure proper installation and operation of the GPAK.

2. The installer must fill in the required information on the nameplate located on the Power Venter electrical box cover. 

3. The installer must affix the appropriate wiring diagram label included with these instructions to the appliance casing adjacent to its 

rating plate.

4. The appliance(s) may only be installed on the suction side of Power Venter.  

5. The installer must notify the homeowner of the maintenance required with the use of the product.

6. The installer must verify that the pilot safety controls (if so equipped) of the appliance are in good operating condition before instal-

lation of the GPAK.

7. No more that 2 appliances may be vented by the GPAK. 

8. The Power Venter must not be installed into any portion of a vent system which serves appliances other than the one(s) vented by 

the GPAK.

9. The installer must shut off all electricity and gas to the appliance using the appliance circuit breaker/fuse for the electricity and shut 

off valve in the supply line to the appliance for the gas before installation of the GPAK.

10. If installing the GPAK on a furnace, the installer must check the limit and fan control for proper operation.  Limit control operation 

can be checked by blocking the circulating air inlet or temporarily disconnecting the electrical supply to the blower motor and
determining that the limit control acts to shut off the main burner gas.

11. If installing the GPAK on a boiler, the installer must determine that the water pumps, low water cutoffs, automatic feed controls, 

pressure temperature limit controls and relief valves are in proper operating condition by following the manufacturer’s recommend-
ed testing procedure.

3

Improper installation, adjustment, alterations, service or maintenance can cause injury or property damage.  Refer to
this manual.  For assistance or additional information consult  a qualified installer, service agency or the gas supplier.

Summary of Contents for 1

Page 1: ... SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE ELECTRI CAL SHOCK CARBON MONOXIDE POISONING EXPLOSION OR PERSONAL INJURY OR PROPERTY DAMAGE DO NOT DESTROY PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE ON JOB SITE FOR FUTURE REFERENCE MODELS DESCRIPTION GPAK J FOR GAS APPLIANCES WITH A BTU HR INPUT OF 120 000 OR LESS GPAK JT FOR GAS APPLIANCES WITH A BTU HR INPUT OF 120 000 OR LESS WHICH REQUIR...

Page 2: ... seconds after the appliance burner shuts off The GPAK J and GPAK 1 are equipped with a 24 115V Relay without the post purge feature GPAK SIZING Verify that the GPAK you are about to install is properly sized for the appliance 1 If installing the GPAK J or GPAK JT confirm that the BTU HR input of the appliance is 120 000 or less If installing the GPAK 1 or GPAK 1T confirm that the BTU HR input of ...

Page 3: ...arometric draft control Do not install the Power Venter on an appliance with an automatic valve having a manual opener unless the manual opener has been rendered inoperative or the automatic valve has been replaced with a valve not equipped with a manual opener Failure to install maintain and or operate the Power Venter in accordance with manufacturer s instructions may result in conditions which ...

Page 4: ... load controlled through the Fan Proving Switch must not exceed the electrical ratings marked on the Fan Prover INSTALLER NOTES 1 The installer must read and follow these instructions carefully to assure proper installation and operation of the GPAK 2 The installer must fill in the required information on the nameplate located on the Power Venter electrical box cover 3 The installer must affix the...

Page 5: ...ks openings or excessive corrosion Check both the limit control and fan control for proper operation 6 Applicable only to boilers Inspect for evidence of water or combustion product leaks Determine that the water pumps are in operating condition Test low water cutoffs automatic feed controls pressure and temperature limit controls and relief valves in accordance with the manufacturer s recommendat...

Page 6: ... the National Fuel Gas Code NFPA 54 All portions of the vent system under positive pressure during operation on the outlet side of Power Venter shall be designed and installed so as to prevent leakage of flue or vent gases into the building All appliances must enter the vent system on the inlet side of the Power Venter Provision shall be made to interlock the appliance s to prevent the flow of gas...

Page 7: ...Series Venting System may only be used with furnaces capable of being chimney vented It is not suitable for use on high efficiency condensing models POWER VENTER MOUNTING 1 Slide the outlet of the Power Venter over the inlet of the Vent Hood and connect them together using the provided screws See Diagram D If you are unable to make a direct connection to the Vent Hood vent pipe may be installed be...

Page 8: ...ce circuit breaker fuse GPAK J GPAK 1 SEQUENCE OF OPERATION WIRED TO GAS VALVE As the thermostat aquastat senses a need for heat the internal switch of the thermostat aquastat will close The switch closure com pletes the 24V electrical circuit to the internal controls of the appliance Before the 24V signal reaches the appliance gas valve it is interrupted by the Power Venter Relay and Fan Proving ...

Page 9: ...8 ...

Page 10: ...9 ...

Page 11: ...istance When the fan proving switch closes the furnace com bustion relay is energized Normal combustion sequence for the furnace begins Induced draft furnace blower starts its proving switch makes energizing ignition control and or gas valve DO NOT OPERATE THE FURNACE WITHOUT THE FAN PROVING SWITCH WIRED INTO THE 24V FURNACE CIRCUIT NOTE When Power Venter is interlocked with thermostat wire all zo...

Page 12: ...11 WIRING GPAK JT GPAK 1T WITH THERMOSTAT ...

Page 13: ...com bustion air opening s into the appliance room as outlined NFPA 54 NFPA 211 Tjernlund s IN FORCERTM engineered combustion air intakes provide a convenient interlocked way to supply combustion air to the utility room When installing a GPAK it is not necessary to supply any more combustion air than normally required when conventional venting SAFETY INTERLOCK COMBUSTION AIR TEST The Power Venter F...

Page 14: ...ports are located on the top of the motor Magnetek motors do not need to be oiled 2 The homeowner must semiannually inspect the Vent Hood and vent pipe for blockage corrosion and leaks 3 A vent system inspection must be performed annually by a qualified service agency The inspection should include the operation circuit check safety interlock test combustion air test and a visual inspection of the ...

Page 15: ... thermostat to call for heat Check for 24V across terminals 4 and 5 of the Relay Timer GPAK JT 1T or the coil of Ice Cube Relay with the BLUE and ORANGE leads attached GPAK J 1 SYMPTOM 2 POWER VENTER RUNS CONTINUOUSLY ERRATICALLY No Solution Replace Relay Timer GPAK JT 1T Part 950 0014 non adjustable or Part 950 1067 adjustable Relay Timer or for GPAK J 1 Ice Cube Relay Part 950 1040 Solution Cont...

Page 16: ...sary to prove the unit has been in service for under one year All receipts should include the date code of the Power Venter to ensure that the defective component corresponds with the complete unit This will help preclude possible credit refusal 15 SYMPTOM 3 POWER VENTER RUNS BUT APPLIANCE DOESN T No Bad Tube Wheel Dirty Contact Tjernlund Products for replace ment tube Clean Power Venter Wheel Sup...

Page 17: ...Any labor charges related to evaluating and replacing the defective part PERFORMANCE CURVES 16 TJERNLUND LIMITED ONE YEAR WARRANTY Tjernlund Products Inc warrants to the original purchaser of this product that the product will be free from defects due to faulty material or workmanship for a period of 1 year from the date of original purchase or delivery to the original purchaser whichever is earli...

Page 18: ...17 GPAK 1 GPAK 1T ...

Page 19: ... clearances are met before attempting to cut opening through exterior wall 4 Attach the template to the building exterior aligning the pilot holes on the template with the pilot holes drilled in step 2 5 Using a reciprocating saw cut an opening through the building siding wall board etc following the appropriate lines of the template 6 Slide the Vent Hood through the opening and fasten to exterior...

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