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Technical Data Manual
Biomass - Thermal Storage Tanks
for use with Biomass Boilers
Safety and Installation Requirements
Please ensure that these instructions are read and
understood before starting any service work. Failure
to comply with these instructions may cause product/
property damage, severe personal injury and/or loss of
life.
Working on the equipment
The installation, adjustment, service and maintenance of
this product must be performed by a licensed professional
heating contractor who is qualified and experienced in the
installation, service, and maintenance of hot water boilers.
There are no user serviceable parts on the tanks.
Product Information
Ensure that main power to the equipment being serviced
is off.
Take precautions to avoid accidental activation of power
during service work.
Do not perform service work on any component part
without ensuring safe operation of the heating system.
When replacing parts, use original Viessmann or
Viessmann approved replacement parts.
Refer to the Installation and Start-up/Service
Instructions applicable to this boiler.
ASME ‘U’ code symbol stamped, pressure vessel with
a Canadian Registration Number (CRN). When used in
conjunction with Biomass boilers, the Biomass Thermal
Storage Tank acts as a thermal reservoir and as a
hydraulic break, decoupling boiler and the heating circuit
from each other.
Heat may be added to the tank by the biomass boiler
or back-up systems and removed by the distribution
system at different rates. This ensures steady supply
temperatures to the heating system and ensures efficient
energy use.
The tanks are equipped with three or five temperature
sensors connected to the boiler control to regulate the
biomass boiler operation.
5457 881 v1.5 06/2013
Boiler model, size Tank USG (L)
Pyrot 150 400 (1514)
Pyrot 220 530 (2006)
Pyrot 300 700 (2650)
Pyrot 400 1000 (3785)
Pyrot 540 1500 (5678)
Pyrotec 390 1000 (3785)
Pyrotec 530 1500 (5678)
Pyrotec 720 1750 (6624)
Pyrotec 950 2500 (9464)
Pyrotec 1250 3300 (12492)
IMPORTANT
Ensure that the lifting/handling equipment is able to
securely handle the size and weight of this tank
(see data on page 2).
The floor where the tank is to be positioned must be able
to properly support the weight of the tank filled with water.
Please file in Service Binder
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Tank Information
Elevation View
Biomass - Thermal Storage Tanks
See Top View for true
orientation of parts
Model
No.
400 800
530 950
700 1200
1000 1500
1500 2400
1750 2700
2500 3500
3300 4200
2
Weight
lbs.
(kg)
(363)
(431)
(544)
(680)
(1089)
(1225)
(1588)
(1905)
Volume
(1514)42(107)83(211)56(142)
(2006)48(122)87(221)57(145)11(28)16(41)
(2650)54(137)90(229)57(145)12(30)18(46)9(23)41(104)10(25)17(43)24(61)31(79)38(97)21(53)
1000
(3785)54(137)
1500
(5678)66(168)
1750
(6624)72(183)
2500
(9464)84(213)
3300
(12492)84(213)
USG
(L)
400
530
700
O.D.
(cm)
O.A.H.
in.
[ref] in.
(307)88(224)12(30)18(46)9(23)72(183)10(25)25(64)40(102)55(140)70(178)21(53)
(315)88(224)14(35)19(48)7(18)81(206)12(30)25(64)38(97)51(130)64(163)24(61)
(307)84(213)15(38)
(328)85(216)21(53)22(56)
(414)
S.L.
in.
[ref] in.
(cm)
(cm)
121
124
121
129
163
119
(302)21(53)22(56)
H.H.
(cm)
8c
(22)
B.G.
in.
(cm)
15
(38)
20b
(525)
A
(cm)
(23)44(112)10(25)18(46)26(66)34(86)42(107)18(46)
9b
(24)
(28)66(168)12(30)25(64)38(97)51(130)64(163)27(69)
12b
(32)
12b
(32)
B
in.
(cm)
(9)
44b
(113)
11
(178)15(38)28(71)41(104)54(137)67(170)30(76)
101b
(258)
C
D
in.
in.
(cm)
(cm)
10
(25)18(46)26(66)34(86)42(107)18(46)
70
15
(38)36(91)57(145)78(198)99(252)30(76)
in.
E
in.
(cm)
F
in.
(cm)
G
in.
(cm)
H
(cm)
in.
5457 881 v1.5
Page 3
Biomass - Thermal Storage Tanks
Tank Information
Top View
“Straight Tank”
Note: The tank must be securely bolted to the floor using
all four mounting supports.
Connection Sizes
Model No. DV N1-4 PRV S1-5 T1-3
400 1 in. 3 in. 2 in.
530 1 in. 3 in. 2 in.
700 1 in. 4 in. 2 in.
1000 1 in. 4 in. 2 in.
1500 1 in. 4 in. 2 in.
1750 1 in. 6 in. 2 in.
2500 1 in. 6 in. 2 in.
3300 1 in. 6 in. 2 in.
c in. c in.
c in. c in.
c in. c in.
c in. c in.
c in. c in.
c in. c in.
c in. c in.
c in. c in.
Top View
“Corner Tank”
Legend
KEY Item No. Qty Description Service
DV 1 Coupling: N.P.T.# 3000, Full Drain
MW 1 12 x 16 in. c/w 150 # Cover & Gasket Manway
N1 1 Pipe c/w 150# R.F.S.O. Flange Supply from Boiler
N2 1 Pipe c/w 150# R.F.S.O. Flange Return to Boiler
N3 1 Pipe c/w 150# R.F.S.O. Flange Return from System
N4 1 Pipe c/w 150# R.F.S.O. Flange Supply to System
PRV 1 Coupling: N.P.T. 3000#, Full P.R.V.
S1 1 Coupling: N.P.T. 3000#, Full Sensor Well
S2 1 Coupling: N.P.T. 3000#, Full Sensor Well
S3 1 Coupling: N.P.T. 3000#, Full Sensor Well
S4 1 Coupling: N.P.T. 3000#, Full Sensor Well
S5 1 Coupling: N.P.T. 3000#, Full Sensor Well
T1 1 Coupling: N.P.T. 3000#, Full Temperature Gauge
T2 1 Coupling: N.P.T. 3000#, Full Temperature Gauge
T3 1 Coupling: N.P.T. 3000#, Full Temperature Gauge
5457 881 v1.5
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PRV Installation
Biomass - Thermal Storage Tanks
Pressure
Relief Valve
Tank
PA 2 in.
Air
Vent
14 in.
(360 mm)
Jacket
WARNING
The discharge pipe for the pressure relief valve must be
oriented to prevent scalding of attendants.
Never pipe the discharge pipe to the outdoors.
Note: The pressure relief valve/air vent is normally
installed to the top opening of the tank (as shown).
If height is a concern, the pressure relief valve can
be installed to the flanged supply connection to the
heating system or from the biomass boiler (see N2/
N4 on page 2) using a field supplied fitting.
Ensure that the pressure relief valve spindle is
always installed vertically. The air vent must be
installed at the top of the tank.
The discharge line opening of the pressure relief
valve must be piped 1.0 ft. (300 mm) above the
floor close to the floor drain with copper or steel
pipe. The discharge pipe must be installed in the
shortest distance and pitch downward from the
pressure relief valve and terminate plain. Ensure
the pressure relief valve is adequately secured.
WARNING
Do not install an isolation valve or any kind of an
obstruction between the tank and the pressure relief
valve or between the pressure relief valve and the
discharge pipe outlet.
(recycled and recyclable) paper.
Wall Clearances
Note: Dimensions shown are recommended minimum
service clearances.
Top View
IMPORTANT
The final location/position of the tank inside the building/
structure must allow access to the manway opening for
tank inspection. If the tank is tight to the wall, an opening
in the wall/structure must be provided to properly access
the manway opening.
The tank rating plate must be in an accessible location.
Technical information subject to change without notice. Printed on environmentally friendly
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5457 881 v1.5
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