Wheelock TPA-20 Installation Instructions Download Page 1

 

273 Branchport Avenue 
Long Branch, N.J.  07740 
(732)  222-6880 

INSTALLATION INSTRUCTIONS 

MODEL TPA-20/TPA-35 

PAGING AMPLIFIER 

GENERAL DESCRIPTION: 

  WARNING:  ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER DOCUMENTS DESCRIBING THE 

PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR ANY OTHER USE, INCLUDING DESCRIPTION OF THE PRODUCT'S APPLICATION, 
OPERATION, INSTALLATION AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK WILL NOT HAVE ANY LIABILITY FOR SUCH USE. 

 

Wheelock's models TPA-20 and TPA-35 paging amplifiers are rated at 20 watts and 35 watts, respectively. 

 

These amplifiers can accommodate three different inputs:  a low-impedance microphone input (both balanced or unbalanced), a transformer isolated 600 
ohm telephone input and a high-impedance music input.  The background music will automatically be muted whenever a page is generated. 

 

The amplifiers feature individual tamper resistant volume controls, tone control, a low-cut horn-protect switch and two LED's:  power on and peak level 
indicators. 

 

Both models operate from 120V, 60Hz and have a power consumption of 59 watts (TPA-20) and 112 watts (TPA-35).  A circuit breaker, enclosed in the 
power transformer, protects the unit against excessive AC current which could cause damage to internal components.  The circuit breaker is self-
resettable, however, in the event it does not reset, have the trouble investigated by an authorized service technician or return unit to the factory. 

  WARNING:  TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. 

 

INSTALLATION: 

Unpacking 
The amplifier was carefully checked before leaving the factory.  Inspect shipping container and unit carefully for indication of improper handling.  If the 
unit has been damaged, make an immediate claim to the carrier. 
Mounting 
The amplifiers are designed for either shelf or wall mounting.  For surface wall mounting, use the 2 keyhole slots in the chassis base, and the mounting 
template on page 5. 
Power Grounding 
The 120 VAC line cord has a three-prong plug which should be plugged into a three wire grounded electric outlet.  It is very important to maintain the 
amplifier grounded for safe and trouble-free operation.  If there is no grounded electric outlet, connect a wire from the GND terminal of the unit to a water 
or steam pipe. 

 

POWER CORD: 

  

CAUTION

:  

To prevent electric shock do not use this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be fully 

inserted to prevent blade exposure/Attention:  pour prevenir les chocs electriques ne pas utiliser cette fiche polarisee avec un prolongateur, une prise de 
courant ou une autre sortie de courant, sauf si les lames peuvent etre inserees a fond sans en laisser aucune partie a decouvert. 

 

TECHNICAL SPECIFICATION: 

 

  # 

Parameters 

TPA-20 

 

TPA-35 

  1. 
  2. 
  3. 

Power Output @ 1 KHz 
Total Harmonic Distortion 
Outputs 

20 Watts Rms 

Less Than 2% THD 

20W @ 8 Ohms 12.5V 25V & 70V 

 

-------- 

35 Watts Rms 

Less Than 2% THD 

35W @ 8 Ohms 12.5V 25V & 70V 

 Inputs 

Telephone 

Mic 

Music 

  4. 
  5. 
  6. 
  7. 
  8. 

Impedance 
Sensitivity 
Frequency Response 
Signal To Noise Ratio 
Type Of Input 

600 Ohms 
-20dBM 

Shaped For Maximum 

61dB 
XFRMR Isolated/Bal. 

LO-Z 
1mV 
Intelligibility 
55dB 
Balanced Or Unbal. 

HI-Z 
220mV 
90Hz-14kHz 
75dB 
Unbalanced 

  9. 
10. 
11. 

Controls 
Indicators 
Protection 

Page Output Volume, Music, MIC And Tel Input Level, Tone, Lo-Cut Switch 

Green LED - Power On, Red LED - Peak Level  * 

AC Automatic Resettable Therm. Breaker & Therm. Overload Protection On Output 

12. 
13. 
14. 
 
15. 
16. 

Tone Control Operation 
Lo-Cut Switch Operation 
Automatic Limiter/Paging 
 
Automatic Mute Operation 
Regulation 

-9dB @ 12KHz 

-6dB @ 250 Hz 

±

 1dB Output Level Maintained Without Clipping, Even While Exceeding Rated Input Level Up To 40dB Minimum. 

40dB Muting At any Output Level 

No Load To Full Load Output Less Than 2dB. 

17. 

Additional Features 

Ability To Double Output Power Into A 25V Line, RFI Protection And Shelf Mount Or Wall Mount. 

18. 
19. 
20. 

Consumption 
Size 
Weight 

0.49A, 59W 

11-1/2"W X 4-3/8"H X 7 1/4"D 

(29.2 X 11.1 X 18.4 cm) 

6lbs. 2 oz. (2.78kg) 

 

-------- 

0.93A, 112W 

11-1/2"W X 4-3/8"H X 7-1/2"D 

(29.2 x 11.1 X 19.1 cm) 

8lbs. 6 oz. (3.8kg) 

 
 

If TPA-35 is subjected to a continuous tone signal input for more than four minutes at full rated output, then the current limiting circuit may be activated.  In that case, 
the unit will shut off and then automatically reset. 

 

Copyright 1989, 1990, 1991, 1993, 1994 Wheelock, Inc.  All rights reserved. 

 

P81782 G 

Sheet 1 of 4 

I

NPUT CONNECTIONS:

 

 (

See Figure 1

.) 

 

Summary of Contents for TPA-20

Page 1: ...It is very important to maintain the amplifier grounded for safe and trouble free operation If there is no grounded electric outlet connect a wire from the GND terminal of the unit to a water or steam pipe POWER CORD CAUTION To prevent electric shock do not use this polarized plug with an extension cord receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure At...

Page 2: ...uent power loss on the distribution line NOTE To allow for future expansion It is recommended that the total system wattage requirement should not exceed 85 of the amplifiers rated output i e 17 watts for the TPA 20 and 30 watts for the TPA 35 the total system wattage requirement is the summation of the wattage tap selections of all system speakers and horns A single 8 ohm speaker may be connected...

Page 3: ... a telephone page 4 Adjust the TEL level control counterclockwise to match the sound level of the microphone for the same setting of the PAGE control NOTE This is a one time adjustment for specific microphone and telephone inputs MUSIC LEVEL The Music control is used to adjust the volume of the background music source Turn clockwise to increase volume and counterclockwise to decrease volume NOTE T...

Page 4: ...OR WARRANTY OF ANY OTHER KIND EXPRESS IMPLIED OR STATUTORY WHETHER AS TO MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR ANY OTHER MATTER USERS ARE SOLELY RESPONSIBLE FOR DETERMINING WHETHER A PRODUCT IS SUITABLE FOR THE USER S PURPOSES OR WHETHER IT WILL ACHIEVE THE USER S INTENDED RESULTS THERE IS NO WARRANTY AGAINST DAMAGE RESULTING FROM MISAPPLICATION IMPROPER SPECIFICATION ABUSE ACCIDENT ...

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