INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Easco Boiler Corp 1175 Leggett Ave Bronx, NY 1047 T: 718.378.3000 F: 718.378.4560 [email protected] easco.com
Page 17 of 46
4.4.4 Means for introduction of combustion and ventilation air supply shall be provided
through permanent unobstructed openings and/or properly designed mechanical ventilation
systems incorporating means to provide Equipment shutdown upon system failure.
4.5 Equipment Field Connections
NOTE: Equipment installation must comply with minimum piping requirements
to ensure proper, safe and reliable performance. Attention should be given to the
construction of the near boiler lead piping and distribution header on steam boilers.
CAUTION! FOR WATER BOILERS:
Hot Water Return Temperature must be above-150
°F. The Recommended Temperature Differential, between Hot Water Supply and Return,
is 20 °F. Thermal Shock could occur when the Temperature Differential, between Hot
Water Supply and Return, approaches 40 °F. Utilization of a Hot Water Supply Blend
Pump, to Return connection, controlled by Minimum Water Temperature Aquastat, is
recommended to assure above guideline.
CAUTION!
Equipment should not be operated at temperature, or pressure, limits, or fuel
input turn down ratios, that permit condensation within Firetubes, Front and/or Rear
Flue Gas Reversing Assembly and Front or Rear Flue Gas Exit Assembly. During cold
start up procedures, condensation will likely occur until Equipment reaches operating
temperature limits. If condensation persists, the low temperature, or pressure, limit, or
fuel input turn down ratio, control should be adjusted to prevent such occurrence. Cold
start cycling should be avoided in order to limit thermal stress cycling of Equipment
and reduce condensation, which are likely experienced during such high load demand
periods. Use of Minimum Water Temperature and Low Fire Hold Aquastats, in
conjunction with Outside Air, or Period Set Back, Controls, will minimize, or prevent, cold
start cycling and condensation occurrences.
4.5.1 Electrical, Fuel and Hydraulic systems, shall be properly designed by an
experienced, and competent, Licensed Design Professional Engineer.
4.5.2 Attach supplies and returns piping lines and apply plugs and/or bushings in
appropriate connections as required. Supply and return piping connections are detailed
in submittal package.
4.5.3 All required field wiring systems should be in accordance with applicable
requirements of most current and accepted edition of NFPA 70 National Electrical Code.
4.5.4 All required field fuel oil piping systems, together with flue gas handling, shall be
in accordance with applicable requirements of most current and accepted edition of
NFPA 31 Installation of Oil Burning Equipment.
4.5.5 All required field fuel gas piping systems, together with flue gas handling, shall
be in accordance with applicable requirements of most current accepted edition NFPA
54 National Fuel Gas Code.
