Columbia L-24, Owner'S Manual, Page: 13 / 60

12
Model WL60 Boiler Connection Ports
(Port, Quantity, NPT, Suggested Uses *)
A (3) 1/2” Water level glass, make-up water inlet
B (4) 3/4” Aquastats (water), Controllers (Steam), 750 LWC probe
C (3) 1” Relief Valve, pr./temp gauge
D (1) 1-1/4” Relief Valve (alternate)
E (4) 2” Drains or Alternate Returns
F (1) 2-1/2” Optional 764, 767 LWC
G (1) 3” Primary return water or condensate
H (1) 4” Heated water or steam to application
I (4) 1” Optional tankless coil(s) w/boilers, std. w/CWH
Model L24 Boiler Connection Ports
(Port, Quantity, NPT, Suggested Uses *)
A (3) 1/2 “ Water level glass, make-up water inlet
B (3) 1/2" Aquastats (water), Controllers (Steam), 750 LWC probe
C (3) 1” Relief Valve, pr./temp. gauge
D (4) 1-1/2” Return water or condensate
E (1) 1-1/4” Relief Valve, (alternate)
F (1) 2-1/2” Optional 764, 767 LWC
G (1) 4” Heated water or steam to application
H (2) 1” Optional tankless coil w/boilers, (upper rear of boiler)
* Note that the above is suggested uses of the ports. As can be seen in our photos there are
many acceptable ways to install the piping and controls. An experienced plumber and con-
trols person should be used to assure the design is functional and meets needs. One must
allow for initial cleaning and purging of oils and dirt from the water loop and then refill
and treat the water as needed to preserve boiler life. Read all the following pages carefully
and plan plumbing and control locations before starting.