Submittal Sheet

part name
iron body pump
lf bronze body pump*
bronze-fitted construction
volute
Cast iron Lead free bronze
impeller
s-25 to s-57
Non-ferrous
h-32 to h-54
Non-ferrous
s-69
Brass-stamped
h-63 to h-68
Cast bronze Cast lf bronze
mechanical seal assembly
Sintered silicon carbide seal
bearing
Sleeve oil lubricated/permanently lubricated
shaft
Alloy steel-copper sleeve/stainless steel
* Certified ≤0.25 weighted average percent lead and complies with California Health and Safety Code Section 116875 (commonly known as ab1953).
max operating
conditions
s-25 to s-69, h-32, h-41 h-51 to h-54, h-63 to h-68
125 psi at 225°f (862 kPa at 107°c) 175 psi at 225°f (1207 kPa at 107°c)
Armstrong Series S & H in-line circulators are suitable for applications such
as hydronics heating and cooling, domestic water systems, multi-stage zon-
ing and general industrial service. Both models are available in a wide range
of sizes to match the performance requirements of any of these applications.
Armstrong Series S & H circulators are durable and trusted products that have
been used by hvac professionals for decades. Besides the existing Sleeve bear-
ing design, Armstrong now has introduced the ‘Maintenance free’ design which
has permanently lubricated ball bearings and require no maintenance at all.
Materials of Construction
Series S & H
Design Features
Armstrong Series S & H in-line circulators are built using
a standard three-piece design that features a radially-split
body, oversized shaft, centrifugal impeller, sintered silicon
carbide seal and modular construction.
Body
The radially-split body can be left in line while servicing the
pump, eliminating cumbersome disconnecting of pipes.
Oversized Shaft
Armstrong circulating pumps have an oversized shaft made
from either special alloy steel, (sleeve bearing design) or
stainless steel (‘Maintenance free’ design) machined to
exacting tolerance. Both shaft designs provide longer life
under severe working conditions.
Centrifugal Impeller
The balanced, centrifugal-design impeller ensures maxi-
mum water delivery in the hvac system.
Positive Mechanical Seal
A proven method of preventing water leakage, the well
known sintered silicon carbide construction is a frequently
imitated feature of the Armstrong circulator. Made from
long-lasting hard-wearing materials, it ensures many years
of noise-free, trouble-free service.
Modular Construction
Models s-25 through s-57 and h-32 through h-54 feature a
unique Armstrong shaft and bearing module which fits all
of these models for ease of serviceability and reduced
inventory costs.
Design Information
Notes:
1 All circulators are to be mounted with pump and shaft in horizontal position.
2 For domestic hot water or fresh water systems, always specify bronze body pumps or lead free bronze body pumps.
3 For temperatures over 225°f (107°c) consult your Armstrong representative.
4 Maintenance free S&H circulators are identified by ‘mf’ in their item numbers.