U.S. Boiler Company Alpine ALP080B, Installation, Operating And Service Instructions

Page: 84 / 148

84 103448-10- 6/18
Tekmar 265 Based Contr
ol S
yst
em (or equal)
Sequence of Oper
ation
The
Tekmar 265 C
ontr
ol (or equal) can contr
ol up t
o thr
ee (3) boiler
s and an Indir
ect
W
at
er Heat
er
.
W
hen a call f
or heat is r
eceiv
ed b
y the
Tekmar 265 C
ontr
ol, the contr
ol
will f
ire either one or mor
e boiler
s in either par
allel or sequential f
iring mode t
o est
ab
lish a r
equir
ed r
eset w
at
er t
emper
atur
e in the s
yst
em suppl
y main based on outdoor
temper
atur
e.
The boiler
s will modulat
e based on an
Analog comm
unication signal est
ab
lished bet
w
een the
Tekmar 265 C
ontr
ol and each boiler
’s S
age2.X C
ontr
ol.
The
boiler(s) and s
yst
em suppl
y w
at
er t
emper
atur
e will be r
eset t
ogether t
o maint
ain the input that is needed t
o the s
yst
em.
W
hen a call f
or Indir
ect Hot
W
at
er is gener
at
ed t
o the
Tekmar 265, the contr
ol will de-ener
giz
e the z
one pump contr
ol (ZC t
er
minal), ener
giz
e the Indir
ect pump and modulat
e the boiler f
iring t
o est
ab
lish a setpoint t
emper
atur
e in
the main f
or the Indir
ect Heat
er using P
rior
ity
.
The
Tekmar 265 also contr
ols each boiler
’s pump and a post pur
ge of lef
to
ver t
emper
atur
e in the boiler
s will occur at the end of
the call f
or Indir
ect Hot
W
at
er
.
Figur
e 31A:
Multiple Boiler
W
ir
ing Dia
gr
am w/T
ekmar 265 Contr
ol
VIII. Electrical
(continued)