Service manual

ManualsBrandsModine Manufacturing ManualsGas HeaterBD

SSppeecciiffiiccaattiioonnss —— PPVV--112244

BBlloowweerr --

Wheel type, forward curved, statically balanced.

MMoottoorr

Motor type — permanent split capacitor with T.O.L.

HP — 1/9

Voltage — 115/208-230/60/1

Amps — 1.6/.8 (Fasco) - 1.7/.87 (Universal)

RPM — 3000

Sealed ball bearings

1. Built-in automatic reset, thermal overload protection.

2. Ball bearings permanently lubricated for long life.

3. Centrifugal safety switch having normally open contacts

which, when connected in series with the heater controls,

prevents burner gas flow when the power exhaust fan is not

operating.

CCoonnttrrooll SSyysstteemm

A built-in centrifugal motor switch prevents gas flow to burner

before sufficient draft is established. The PV-124 includes a 24-

volt, factory-mounted, relay for operation on gas-fired units

utilizing 25V low voltage control systems.

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The housing and discharge flange are fabricated of steel

having baked-on electrostatically applied polyester resin

powder paint finish.

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Required to connect the power exhaust to the heater flue

outlet. Built-in restrictors are used to obtain optimum

combustion and efficiency for all size heaters.

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The exhaust motor does not require periodic lubrication. The

bearings are permanently lubricated with a special high

temperature lubricant. A periodic cleaning of blower wheel

blades, motor, and centrifugal switch is recommended.

EElleeccttrriiccaall CCoonnnneeccttiioonnss

Installation of wiring must conform with local building codes, or

in the absence of local codes, with the National Electric Code

ANSI/NFPA 70 - Latest Edition. Unit must be electrically

grounded in conformance to this code. In Canada, wiring must

comply with CSA C22.1, Part 1, Electrical Code.

TTyyppiiccaall PPoowweerr EExxhhaauusstt WWiirriinngg —— PPDD//BBDD

1. Remove the factory installed buss bar (jumper) from

between terminals “C” and “V” of terminal board.

2. Connect one red lead from centrifugal switch (CS) of power

exhaust to terminal “C” on terminal board. Connect the

other red lead from centrifugal switch (CS) to terminal “V”

of terminal board.

3. Connect terminal (3) of power exhaust relay to terminal

“T2” of terminal board.

4. Connect terminal (1) of power exhaust relay to terminal “G”

of terminal board.

5. Connect terminal (2) of power exhaust relay to L1 of power

supply in unit junction box.

6. Connect L2 lead from power exhaust motor to L2 lead of

power supply in unit junction box.

7. Connect thermostat between terminals “T1” and “T2” of

terminal board.

CChheecckk--OOuutt PPrroocceedduurree

With the power and gas supply turned off, set the thermostat to

its lowest setting.

1. If the unit has a standing pilot, turn on the gas supply only

and light the pilot according to the instructions on the unit’s

serial plate, then proceed with Step 2. If the unit is

equipped with an intermittent pilot ignition system, turn on

the gas supply to unit and proceed with Step 2.

2. Turn on power supply to unit. Nothing should happen.

3. Turn up the thermostat to call for heat. The power exhaust

motor should start, the centrifugal switch of the power

exhaust should close, and the main burner should light.

After a delay of approximately 30 seconds, the fan motor

should start.

4. Turn the thermostat down again. The main burner and

power exhaust motor should shut off. The fan motor

should continue to run for approximately 1 to 1 1/2

minutes. Modine units are equipped with a time delay

relay, and the fan motor is delayed for approximately 30

seconds on start-up, and 1 to 1 1/2 minutes on shut-

down.

5. Check the power exhaust centrifugal switch for proper

function. To do this, remove the centrifugal switch lead

from terminal “V” of the terminal board. Turn up the

thermostat to call for heat. The power exhaust motor

should run, but the main burner should not light. After a

30 second delay, the fan motor should operate. The main

burner should still not light.

6. Turn down the thermostat and allow the power exhaust

motor and fan motor to stop running. Reconnect the

centrifugal switch lead to terminal “V” of the terminal

board. Recycle the unit as described in Steps 3 and 4.

If the unit does not operate in the sequence described above,

recheck all wiring until the necessary correction to the wiring

is found and corrected. Set the thermostat to the desired set

point. The unit is now ready for use.

FFiigguurree 66..11

TTyyppiiccaall WWiirriinngg –– PPoowweerr EExxhhaauusstt AAcccceessssoorryy

((MMooddiinnee ##7799885588 oorr ##7799886611))

WARNING

1. Disconnect power supply before making wiring

connections to prevent electrical shock and equipment

damage.

2. All appliances must be wired strictly in accordance with

wiring diagram furnished with the appliance. Any wiring

different from the wiring diagram could result in a

hazard to persons and property.

3. Any original factory wiring that requires replacement must

be replaced with wiring material having a temperature

rating of at least 105°C.

To Thermostat

Terminal board

on Junction Box

To L1

To L2

To Combination

Gas Control or

Ignition Control

Power

Exhaust

Motor

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