Engineering Bulletin

110-22-002-1012
4
PART 3 EXECUTION
3.1 PREPARATION
A. Prior to commencing work, the contractor will have read and understood the Installation, Operation and
Maintenance Manual (IOM) supplied and enclosed with the attendant circulating pumps. This manual is supplied in
English, French and Spanish.
B. The effectiveness of the system is dependent on the system being designed and installed correctly. Proper
consideration of factors such as BTU loads, outdoor design temperature, indoor design temperature, room set-
point temperature(s), differential fluid temperatures, head loss, flow rates and transfer capacities of the heat
emitters is critical.
C. Prior to final connection of the circulators as part of the hydronic system, the system piping shall be flushed of all
contaminants and foreign objects.
3.2 INSTALLATION
A. The circulating pumps must be installed by a qualified installer/service technician.
B. The circulating pumps shall be installed in accordance with the relevant requirements of the local authority having
jurisdiction, as required to meet the performance requirements and function specified for the system.
C. The circulating pumps must be installed and operated strictly in accordance with the terms set out in the
Installation, Operation and Maintenance Manual supplied and enclosed with the attendant circulating pumps.
D. The pump shall be installed with the motor shaft in a horizontal plane with no exceptions. The electrical terminal
box shall be installed at the 3:00, 9:00 or 12:00 position, referenced from the nameplate end of the motor.
E. The pump must be installed in a way that it is not stressed by the pipework. A minimum of three pipe diameters of
straight pipe is recommended on the inlet of the pump.
F. Where anti-freeze protection is required, the maximum concentration of heating system glycol is 50% by volume.
High concentrations of glycol at lower system design temperatures may require increasing the design operating
point [consult factory]. Use of leak sealant products or automotive anti-freeze is not permitted.
G. Fluid temperature limitations are 14°F (-10°C) to 230°F (110°C) for the pumps. Maximum ambient temperature
surrounding the cast iron or bronze bodied pumps shall be 104° F (40°C).
H. Minimum Inlet pressure (psi) at pump suction port to avoid cavitation at fluid temperatures:
122 °F (50 °C) 0.7 psi [.05 bar]
203 °F (95 °C) 4.4 psi [.3 bar]
230 °F (110 °C) 14.5 psi [1 bar]
3.3 FIELD QUALITY CONTROL
A. Upon receipt and prior to commissioning, the circulating pumps should be inspected for any sign of visible damage.
B. Prior to commissioning the circulating pumps, the system connections should be complete and leak-free. The
system should be filled and purged as per instructions in the IOM manuals. The system fluid should be tested and
have a pH level of between 6.5 and 9.5 and be suitable for hydronic system use.
C. Following fill and purge, the system should undergo a pressure test.
Wilo USA LLC
9550 W. Higgins Rd #300
Rosemont, IL 60018
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.wilo-usa.com
Wilo Canada Inc.
Bay 7-2915 10th Ave NE
Calgary, AB T2A 5L4
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.wilo-canada.com
Wilo Mexico
Managua No 978, Colonia Lindavista
07300 México, D.F., México
Tel: + 52 55 5586 3209
Fax: + 52 55 5586 3209
Email: [e-mail]
Web: www.wilo-mexico.com