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GT710 Swing Door FAQ
- How do I Preload the arm?
The arm preload depends on the hand, direction of swing and the type of arm used. Please see the GT710 installation manual (p/n 15-10683) starting on page 10 for detailed information.
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Pre-Loading and Installing Arm
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Operator
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# on Spindle
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RH Inswing
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3
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LH Inswing
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4
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RH Outswing
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1
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LH Outswing
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2
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RH Inswing with 0” Reveal
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4
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LH Inswing with 0” Reveal
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3
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Align the preload mark on the
arm with the number shown to properly preload the unit.
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- How do I adjust the Magnum control for a 710?
Detailed instructions are in the Magnum 4 Installation Manual (p/n 15-10682)
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 Potentiometers and
Functions
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POT
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FUNCTION
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STOP
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Adjusts how door reacts to continuous safety input (terminal # 3) during
Opening. Counterclockwise = door stops and closes, Clockwise = door stops and
creeps open
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OPEN
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Adjusts opening speed. Clockwise = faster
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BCHK
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Adjusts Back Check speed. Clockwise = faster
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TDAS
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When control is activated by a push switch: Adjusts how long door remains open
after BACK Check signal is detected.
Clockwise = longer
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TDPG
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When control is activated by Push-N-Go: Adjusts how long door remains open after
BACK Check signal is detected.
Clockwise = longer
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LCHK
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Adjusts Latch Check speed. Clockwise = faster (not used on GT710)
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CLOSE
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(not used on GT710) Adjusts closing speed. Clockwise = faster
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Current Limit
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Adjusts how hard the door will push against an obstacle (while opening) before
recycling. Clockwise = less sensitive
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- How do I install the magnets?
The magnets have a stripe painted on one side. Each magnet must be installed with the stripe facing up and centered on the switch. The back check magnet is placed on the sprocket when the door is at 90 degrees. The door closed switch is placed with the door closed.
- What size Allen wrenches are used on the LCN closer?
3/32” for the hydraulic port adjustments and 5/32” for the spring force.
- Since the GT710 has a closer in it, what setting should the Magnum board be set to for back check speed?
Start with the Magnum board BCHK pot set to the 12 o’clock position then adjust the LCN. Conditions, such as the amount of hydraulic backcheck pressure, may require changing the pot but this is a good starting point.
- When I set the switch to hold open, why does the door open fully, close after a while and then re-open?
It’s probably because the motor thermal breaker opened because the back check speed is set too high on the control board. Turn the BCHK pot counter clockwise until the problem clears.
Or, if the door opens past the BCHK magnet and therefore loses the signal at the full open point, the operator will continue to try opening for 15 seconds total then time out and close. Upon detecting the BCHK magnet again while closing it will re-open and this cycle will continue indefinitely. The solution is to re-set the BCHK magnet properly as per the instructions found here
- Why doesn’t the Magnum board let me set the latch check speed on a 710?
The Magnum board is prevented from interfering with the closing speed since on the GT710 this is regulated by the hydraulic closer. All the braking during closing must be adjusted with the closer.
It is approved for use on fire door assemblies rated up to 3 hours.
- Where does the power come in?
The preferable location is on the end opposite to the closer. The 710 header has 7/8” holes on each end of the header in the end caps which are covered by plastic dome plugs. The hole on the spindle end is generally used as access to adjust the spring force in the hydraulic closer.
- Can the header for the GT-710 be overhead concealed (OHC)?
Yes, in that case it would be designated a model GT-7310.
- Can it open to greater than 90 degrees?
Yes to approximately 105 degrees. It will physically open beyond that but it will exceed the range of the back check magnet and possibly the arm.
- Can I mount the bottom of the operator flush to the bottom of the frame?
Yes but you will need to cut the lip off of bottom of the header. This wouldn’t work for an inswing since the spindle would have been lowered about 1-1/8” and would then interfere with the swing of the door.
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