Table of Contents
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Installation Manual
Multiple-boiler systems with
Weil-McLain Easy-Fit
This manual must only be used by a qualified heating installer/service technician.
Before installing, read all instructions, including this manual, the Ultra Boiler
Manual and all applicable Supplements. Consider all connections to the boilers
before selecting a location and layout. Failure to comply could result in severe
personal injury, death or substantial property damage.
Gas-fired
water boiler
®
piping
• Selection data
• Installation
• Piping
• Water treatment
with
Part No. 550-101-232/0703
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Table of Contents
Related Manuals for Weil-McLain Boiler
Summary of Contents for Weil-McLain Boiler
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Page 1: Water Treatment
Weil-McLain Easy-Fit This manual must only be used by a qualified heating installer/service technician. Before installing, read all instructions, including this manual, the Ultra Boiler Manual and all applicable Supplements. Consider all connections to the boilers before selecting a location and layout. Failure to comply could result in severe personal injury, death or substantial property damage. -
Page 2: Table Of Contents
Combustion air manifolds ... 13 Gas piping Connecting gas supply piping ... 14 Common gas piping installation... 15 Additional instructions Air for boiler room ventilation ... 16 Wiring ... 16 Water treatment ... 16 — Installation Manual — Multiple-boiler Systems Piping installation ... -
Page 3: Hazard Definitions
Venting and combustion air Ultra boilers must be vented individually. Combustion air must be piped to the boiler as well, but may be manifolded as shown on page 13. Follow Weil-McLain Ultra Boiler Venting Supplement and Boiler Manual plus information in this manual. Failure to comply will result in severe personal injury or death. -
Page 4: Ratings And Engineering Data
— Installation Manual — Multiple-boiler Systems FIRED WATER BOILER Ratings and engineering data Figure 1 Ratings and engineering data (see page 5 for notes) D O E Part number 550-101-232/0703... - Page 5 Figure 1 Ratings and engineering data (continued) For simplicity, the table on page 4 lists only systems using multiples of the same Ultra boiler module. Any combination of Ultra boilers can be installed as a multiple boiler system. Water header piping Determine the flow rate that the system header and other pipes will handle.
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Page 6: Dimensions
Dimensions Figure 2 Dimensional data Notes 1. Boiler supply and return tappings are both 1" NPT. Connect to headers with 1” pipe for Ultra-80 and Ultra-105; 1¼" pipe for Ultra-155 and Ultra-230. For wall-hung boilers, water piping and gas pipe can be routed through bottom of enclosure using wall-mounting kit. -
Page 7: Wall Mounting
FIRED WATER BOILER Placement and mounting information Placement, general Figure 3 1. Locate multiple boilers in boiler room according to: • Figure 3 (side-to-side), or • Figure 4 (back-to-back). For wall mounting, see below. 2. Provide indicated clearances around boilers for access and servicing. -
Page 8: Easy-Fit Piping
1¼" nominal copper tubing or steel pipe (maxi- mum run 15'). 5. Provide a flow/check valve in the supply piping of each boiler as shown in piping diagrams in this manual. Install an isolation valve on the supply and return of each boiler as shown. -
Page 9: Piping Schematic
When using isolation valves on each boiler, some codes may require providing a low water control and additional limit for each boiler. If desired, consult the codes to determine if exclusion of the individual boiler isolation valves may allow the use of a single water level control and additional limit for the entire multiple boiler system. -
Page 10: Easy-Fit
FIRED WATER BOILER ® Easy-Fit Piping Figure 9 Typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit 1 Flow/check valve (each boiler) 2 Isolation valves (when used) 3 Caps 4 Easy-Fit ® Manifold (supply), sized per Fig. 6 or Fig. 7, page 8 ®... - Page 11 Wire the heating system circulator to operate only on call for heat. Alternatively, use the boiler sequencing panel to provide domestic priority by disabling the heating system circulator any time there is a DHW call for heat. The boiler circulators, item 17, must operate on any call for heat, whether heating system or DHW.
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Page 12: Easy-Fit
FIRED WATER BOILER ® Easy-Fit Piping Figure 11 Typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit 1 Flow/check valve (each boiler) 2 Isolation valves (when used) 3 Cap ® 4 Easy-Fit Manifold (supply), sized per Fig. 6 or Fig. 7, page 8 5 Easy-Fit ®... -
Page 13: Combustion Air And Vent Piping Installation
FIRED WATER BOILER Combustion air & vent piping installation Vent piping 1. Each boiler requires an individual vent pipe, in- stalled and terminated per the Ultra Boiler Manual and Ultra Boiler Venting Suppments. 2. The vent pipes of multiple boilers must terminate on... -
Page 14: Gas Piping
Figure 13 Connecting gas supply piping Use two wrenches when tightening gas piping at boiler, using one wrench to prevent the boiler gas line connection from turning. Failure to support the boiler gas connection pipe to prevent it from turning could damage components. -
Page 15: Common Gas Piping Installation
Pipe lengths in Table 1 are equivalent length of straight pipe. Convert pipe fittings to equivalent lengths using data from Table 2. 5. Refer to page 14 of this manual and to the Ultra Boiler Manual for testing gas piping. Table 2... -
Page 16: Additional Instructions
FIRED WATER BOILER Additional instructions Air for boiler room ventilation 1. Follow instructions in Ultra Boiler Manual to ensure the boiler room provides sufficient air infiltration. Wiring 1. Refer to boiler sequencing control instructions and Ultra Boiler Manual for wiring re- quirements.
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