Weil-McLain Series 4 User manual

Part Number 550-110-646/0607
This supplement must only be used by a qualified heating installer/service technician. Before installing, read all
instructions, including this supplement, the boiler manual and any related documents. Perform steps in the order given.
Failure to comply could result in severe personal injury, death or substantial property damage.
Control supplement – Universal control systems
For additional information, refer to . . .
EG • PEG • EGH Boiler manual
for Natural or Propane gas
(tankless heater application optional)
Gas-Fired Boilers – Series 4
EG• PEG• EGH

2Part Number 550-110-646/0607
EG • PEG • EGH Series 4
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.
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.
Note to the installer
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.
Hazard definitions
Please read this page first!

3
Part Number 550-110-646/0607
Universal control systems — Control supplement
Hazard definitions and Note to the installer ....................................................................................2
Control installation — EG-30 through EG-75 water boilers without tankless heaters ............ 4-5
Control installation — EG-30 through EG-75 water boilers with tankless heaters .................. 6-7
Control installation — EG and PEG steam boilers with probe-type low water cutoff ............. 8-9
Control installation — EG steam boilers with float-type low water cutoff............................ 10-11
Control installation — EGH water boilers without tankless heaters ..................................... 12-13
Control installation — EGH water boilers with tankless heaters........................................... 14-15
Control installation — EGH steam boilers with probe-type low water cut-off ..................... 16-17
Control installation — EGH steam boilers with float-type low water cut-off ....................... 18-19
Damper installation ..........................................................................................................................20
Checkout procedure ........................................................................................................................21
Operating instructions ............................................................................................................... 22-26
Troubleshooting.......................................................................................................................... 27-31
Replacement parts ...........................................................................................................................32
Table of contents

4Part Number 550-110-646/0607
EG • PEG • EGH Series 4 — Universal control systems — Control Supplement

5
Part Number 550-110-646/0607
Universal control systems — Control supplement
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 prop-
erty damage.
Control installation
EG-30 through EG-75 water boilers without tankless heaters
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
provided.
b. Install transformer with plug-in relay receptacle and relay.
c. Operating and limit circuit wiring must be 18 gauge or heavier.
2. Bring supply wiring to boiler. Must be 14 gauge or heavier.
3. Proceed to page 20.
Figure 1 EG-30 through EG-75 water boilers without tankless heaters