Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-6 User Manual

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General piping information

•฀Hartford Loop piping arrangement and wet return are required for

steam boilers.

•฀Maintain 24-inch minimum from waterline to bottom of header

(minimum 50

/8" from ﬂoor or top of foundation).

•฀When using condensate receiver, feed pump must be energized by

boiler-mounted pump control.

•฀Use swing joints in steam piping.

•฀If installation is to comply with ASME or Canadian requirements, an

additional pressure limit control is needed. Install control between

existing pressure control and pressure gauge. Control must be installed

with siphon (supplied with boiler) between control and boiler. Set

control to minimum of 5 psi above set point of existing control and

maximum setting of 15 psi. Wire as shown on boiler wiring diagram.

Install piping

1. See Table 5 at right and Figure 14, page 21 or Figure 15, page 22.

Improperly piped systems or undersized piping can con-

tribute to erratic boiler operation and possible boiler

or system damage. Piping system must be installed as

shown, using minimum pipe sizes shown. Consult your

Weil-McLain distributor or sales ofﬁce before installing

alternate piping.

2. Install relief valve vertically in “R” tapping on back of boiler. See

Figure 14 or Figure 15 and also refer to tag attached to relief valve for

manufacturer’s instructions.

Pipe relief valve discharge line near ﬂoor close to ﬂoor drain

to eliminate potential of severe burns. Do not pipe to any

area where freezing could occur. Do not plug, valve or place

any obstruction in discharge line.

3. Float-type low water cutoff only — install blow down line in bottom

of cutoff. See Figure 14 or Figure 15 and also refer to low water cutoff

manufacturer’s instructions for details.

Pipe blow down line near ﬂoor close to ﬂoor drain to eliminate

potential of severe burns. Do not pipe to any area where freez-

ing could occur. Do not plug, valve or place any obstruction

in discharge line.

To connect SGO boilers to indirect-ﬁred water

heaters

Install and wire per water heater manual provided with water heater.

If boiler already has a tankless heater installed:

•฀Remove tankless heater and install cover plate.

•฀Leave tankless heater installed. Drain coil and remove piping. Do not

plug holes in tankless heater front plate.

Connect steam piping

Table 5 Steam piping size table

One฀and฀two-pipe฀systems

Boiler฀

Model฀

Number

Riser฀Pipe฀

Size฀฀

(Note฀1)

Header฀

Pipe฀Size฀

“H”฀

(Note฀2)

Equalizer฀

Pipe฀฀

Size฀

“J”

SGO-3

2½"

(Note฀3)

— 2½” 1½"

SGO-4

2½"

(Note฀3)

— 2½" 1½"

SGO-5 2½" — 3" 1½"

SGO-6 2½" 2½" 3" 1½"

SGO-7 2½" 2½" 3" 1½"

SGO-8 2½" 2½" 3" 1½"

SGO-9 2½" 2½" 3" 1½"

One-pipe฀counter฀ow฀systems

SGO-3 2½" — 2½” 1½"

SGO-4 2½" — 2½" 1½"

SGO-5 2½" — 3" 1½"

SGO-6 2½" 2½" 4" 1½"

SGO-7 2½" 2½" 4" 1½"

SGO-8 2½" 2½" 4" 1½"

SGO-9 2½" 2½" 4" 1½"

Note฀1

Based on ASHRAE Fundamentals

Handbook recommendations, allowing ½

oz. pressure drop at 0 psig.

Note฀2

Based on ASHRAE Fundamentals

Handbook recommendations, allowing 2

oz. pressure drop per 100 feet of pipe at 3.5

psig. Maintain minimum 24" height from

waterline to bottom of header.

Note฀3

Can be reduced to 2".

Part number 550-142-330/0421

SGO

OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual

SERVICE฀TECHNICIAN฀ONLY฀—฀read฀and฀follow฀completely.

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Weil-McLain SGO SERIES 4 OIL-FIRED STEAM BOILER SGO-6 Residential Boilers

User Manual - Page 20