Weil-McLain PFG-7 User Manual

EGH-85 & 95 Series 4
PFG-6 & 7 Series 6 & 7

Control Supplement

Standing Pilot Boilers

Controls must only be installed by a Weil-McLain distributor or other
qualified installer/service technician in accordance with this Supplement and
all applicable codes and requirements of the authority having jurisdiction.
Read this Control Supplement completely before beginning the installation.
If the information in this Supplement is not followed exactly, a fire, explosion,
carbon monoxide emission or other hazardous conditions can result, causing
severe personal injury, death or substantial property damage.

Part Number 550-110-031/0605

EGH-85 & 95 Series 4 and PFG-6 & 7 Series 6 & 7

Please read this page first!

Hazard definitions

The following defined terms are used throughout these instructions to bring attention to the
presence of hazards of various risk levels or to important information concerning the life of the
product.

Indicates presence of hazards that will cause severe personal injury, death or
substantial property damage.

Indicates presence of hazards that can cause severe personal injury, death or
substantial property damage.

Indicates presence of hazards that will or can cause minor personal injury or
property damage.

Indicates special instructions on installation, operation or maintenance that
are important but not related to personal injury or property damage.

Note to the installer

This system is used on gas-fired boilers without vent dampers as shipped
from the factory. This system is not offered for retrofit. Any attempt to apply
the system components to boilers shipped for use with a different control
system will not be covered under boiler warranty and can cause severe
personal injury, death or substantial property damage.

When calling or writing about the boiler, please have the boiler model number
from the boiler rating label and the CP number from the boiler jacket.

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Part Number 550-110-031/0605

Control Supplement — Standing Pilot Boilers

Table of contents

Hazard definitions and Note to the installer ....................................................................................2

Control installation — EGH-85 & 95 water boilers........................................................................ 4-5

Control installation — PFG-6 & 7 water boilers............................................................................ 6-7

Control installation — EGH-85 & 95 steam boilers with probe-type LWCO ................................ 8-9

Control installation — EGH-85 & 95 steam boilers with float-type LWCO .............................. 10-11

Checkout procedure ........................................................................................................................11

Lighting instructions ........................................................................................................................ 12

Troubleshooting ......................................................................................................................... 13-15

Parts ................................................................................................................................................. 16

Part Number 550-110-031/0605

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EGH-85 & 95 Series 4 and PFG-6 & 7 Series 6 & 7

Control installation — EGH-85 & 95 water boilers

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Part Number 550-110-031/0605

Control Supplement — Standing Pilot Boilers

Control installation — EGH-85 & 95 water boilers

For your safety, turn off electrical power supply and turn off external gas supply valve before attempting to work
on the boiler. Failure to comply can cause severe personal injury, death or substantial property damage.

1. Mount and wire controls per wiring diagram, page
4, and Figure 1.

a. Attach junction box inside left jacket panel with

#8-32 x ½" machine screws and green ground
nuts provided.

b. Install transformer with plug-in relay receptacle

and relay. In Canada, use chain and hook strain
relief.

c. Operating and limit circuit wiring must be 18

gauge or heavier (as supplied with the boiler).

2. Bring supply wiring to boiler. Must be 14 gauge or
heavier.

Figure 1

Part Number 550-110-031/0605

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