Milnor 7272TG1L Installation And Service Download Page 48

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PELLERIN MILNOR CORPORATION

BIPDUI01 (Published) Book specs- Dates: 20080723 / 20080723 / 20080723 Lang: ENG01 Applic: PD6

Service Connections For Gas, Steam and Hot Oil Dryers,
Conditioners and Shakers

General

The connections which may be required depending on machine model and options are:

1. Piped Inlets and Outlets: cold water, compressed air, gas, steam, hot oil, steam condensate

line or gas line vent, main air intake, main air exhaust. The sizes and locations of piped inlets
and outlets are shown on the dimensional drawing for your machine.

2. Electric Power Connections.

3. Electrical Control Connections.

Precautions for Piped Connections

1. Inlet pressure must be within the range specified. Pressure outside of the range may cause the

machine to operate inefficiently or to malfunction and may damage machine components.

2. When connecting water and steam inlets, always install unions and shut off valves at the

point of connection to permit removal of the machine components for servicing, if necessary.

3. A vent line must be installed from the regulator vent to the outdoors (if applicable).

4. A minimum 1/2 inch NPT plugged tapping, accessible for test gauge connection, must be

installed immediately upstream of the gas supply connections to the dryer (if applicable).

WARNING 1 : Explosion and Fire Hazards

—Improperly installed gas-fired devices have

the potential for gas release.

• Conform with local codes or, in their absence, with the

National Fuel Gas Code, ANSI

Z223.1/NFPA 54

or the

Natural Gas and Propane Installation Code, CSA B149.1

or a

superseding directive.

• The machine must be electrically grounded in accordance with local codes or, in their

absence, with the

National Electric Code, ANSI/NFPA 70

or the

Canadian Electrical

Code, CSA C22.1

or a superseding directive.

WARNING 2 : Explosion, Fire, and Machine Damage Hazards

—Gas pressure in excess

of 1/2 psi (3.5 kPa) can damage gas train components, possibly resulting in the release of gas.

• Disconnect the dryer and its manually operated appliance main gas valve from the gas

supply for any pressure testing of that system at pressures in excess of 1/2 psi (3.5 kPa).

• Isolate the dryer from the gas supply by closing the equipment shutoff valve during any

pressure testing of that system at pressures equal to or less than 1/2 psi (3.5 kPa).

CAUTION 3 : Machine Malfunction Hazard

—Steam traps rated at 85 to 180 psi (586 to

1241 kPa) will not operate properly below 60 psi (414 kPa). Steam traps rated at 160 to 225 psi
(1103 to 1551 kPa) will not operate properly below 115 psi (793 kPa).

• Conform to the rated pressure of the steam coil as stated on the machine nameplate.

• Choose a steam trap with a pressure rating corresponding to the actual pressure supplied.

CAUTION 4 : Machine Damage Hazards (Steam Dryers and Conditioners Only)

—

Allow steam coil to preheat and purge condensate before operating dryer or conditioner.

• Verify that the facility boiler has operated at least 15 minutes before the dryer receives the