Weil-McLain ECO110 User Manual

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&IGURE Install pipe ﬁttings for relief valve and

pressure/temperature gauge —

$/

./4MOUNTRELIEFVALVEUNTIL!&4%2

HYDROSTATICTESTING

(see legend below)

&IGURE Install piping components required for hydrostatic

test (

see legend below)

Part number 550-142-122/0513

GAS-FIRED WATER BOILER — Boiler Manual

1 Boiler supply (outlet) connection, (male, 1” NPT )

2 Boiler return (intlet) connection, (male, 1” NPT )

3 Boiler relief valve, shipped loose with boiler — $/./4MOUNTRELIEFVALVEUNTIL!&4%2HYDROSTATICTESTING.

3a 4%-0/2!2),9/.,9 Insert a ¾” NPT plug in the relief valve tapping of the reducing tee. 4HIS-534"%2%-/6%$AFTER

THETESTANDTHERELIEFVALVEMOUNTEDHERE.

4 Pressure/temperature gauge, shipped loose with boiler

5a Reducing tee, NPT, 1 ” x 1 ” x ¼” on 70/110, & 1 ¼” x 1 ¼” x ¼” on 155, shipped loose with boiler

5b Reducing tee, NPT, 1 ” x 1 ” x ¾” on 70/110, & 1 ¼” x 1 ¼” x ¾” on 155, shipped loose with boiler

6 Nipple, NPT 1” x close on 70/110, & 1 ¼” x close on 155, shipped loose with boiler

7 Reducing bushing, NPT, 1 ¼” x 1”, shipped loose with boiler (155 only)

8 Nipple, NPT 1” x close on 70/110, & 1 ¼” x close on 155, by installer

9 Isolation valve on supply connection, by installer (1” NPT on 70/110, 1¼” NPT on 155)

10 isolation valve on return connection, by installer (1” NPT on 70/110, 1¼” NPT on 155)

11 ¾” NPT boiler drain valve, shipped loose with boiler — after hydrostatic testing, move drain valve to lowest point on the return piping if not

already there.

Boiler hydrostatic test (continued)

(155 only)

Piping from system

Piping to system

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Weil-McLain ECO110 ECO Wall Mount Gas Boiler