Weil-McLain 88 manual Connect steam boiler piping, General steam piping information

Weil-McLain 88 Water and steam boilers — Series 2 — for Gas, Light Oil, & Gas/Light Oil-Fired Burners

Connect steam boiler piping

General steam piping information:

Figure 20 Cold water fill piping

1.Hartford loop piping arrangement and wet return are required for steam boilers. Use the Hartford loop for both pumped-return and gravity-return systems.

2.Maintain 24-inch minimum from waterline to bottom of header (63" from bottom of section).

3.When using condensate receiver, feed pump must be energized by boiler-mounted pump controller.

4.Install piping:

a.Install piping as shown on page 17 through page 18 for single boil- ers. See page 19 for additional requirements when piping multiple boilers.

b.Return pipe sizing.

• Pumped return — Size return piping by pump.

• Gravity return — Size gravity return same as Hartford loop	Figure 21 Condensate piping to boiler
equalizer pipe size.

c.Drain valve — Install system drain valve in lowest part of return piping close to boiler. See Figure 17, page 15, for sizing.

d.Cold water fill piping — Connect cold water fill piping as shown in Figure 20. Also shown are recommended valves and water meter, if used. Water meter will detect added makeup water, indicating leaks in system.

e.Condensate return piping:

•Satisfactory operation of any steam heating system depends on adequate return of condensate to maintain steady water level.

•Avoid adding excessive amounts of raw make-up water.

•Where condensate return is not adequate, a low water cutoff with pump control, condensate receiver, and condensate boiler feed pump should be installed.

•See Figure 21 for piping and Figure 22 for sizing.

Figure 22 Condensate receiver capacity required

Boiler	I=B=R gross output	Gallons condensate	Minimum condensate receiver capacity (gallons) (Note 1)				Recommended condensate
model number	(lbs steam per hour)	per hour					feed pump capacity
			15-minute boiler	30-minute boiler	45-minute boiler	60-minute boiler
							GPM at 15 PSI
			operation	operation	operation	operation
488	810	97	29	58	87	116	3.2
488R	794	95	28	57	85	114	3.1
588	1084	130	39	78	117	156	4.3
688	1358	163	49	98	147	196	5.4
788	1632	195	59	117	176	234	6.5
888	1904	228	68	137	205	273	7.6
988	2170	261	78	157	235	313	8.7
988R	1991	239	72	145	217	289	8.0
1088	2452	294	88	176	265	353	9.8
1088R	2304	277	83	166	249	332	9.2
1188	2724	327	98	196	294	392	10.9
1288	3000	360	108	216	324	432	12.0
1388	3270	392	117	235	353	470	13.1
1488	3550	426	127	255	383	511	14.2
1588	3820	458	137	274	412	550	15.3
1688	4090	490	147	294	441	588	16.4
1688R	3980	478	143	287	430	574	15.9
1788	4370	524	157	314	471	629	14.5
1888	4640	557	167	334	501	668	18.6

Note 1 — Maximum time to when condensate returns to boiler — the longer the time for condensate to return, the larger the receiver must be.

16 Part No. 550-100-068/0308