Typical Specification
XLP-SPEC-01
Typical Specification for Lochinvar® XLP Pool Heater Package
Models 399,000 - 800,000 Btu/Hr
The POOL HEATER shall be a LOCHINVAR XLP Model XP (N, L) _________having a modulating input rating of
_________ Btu/Hr, an output of _________ Btu/Hr and shall be operated on (Natural Gas) (L.P. Gas).
The pool hot water supply shall be provided by a LOCHINVAR XLP PACKAGED POOL HEATING SYSTEM
Model_______________. The package system shall consist of a boiler plant, and a Shell and Tube heat exchanger, the
design of the system shall be such that pool water is never directly heated by the boiler plant, and it shall only be heated
indirectly by means of the Shell and Tube Heat exchanger. The Boiler and Heat Exchanger shall be completely factory piped
and assembled and shall include a cast iron circulating pump, expansion tank, flow switch, ASME Certified pressure relief
valve set for 50psi, automatic fill valve with pressure reducer and a temperature / pressure gauge. Entire package shall be
skid mounted, pre-piped, assembled, and pressure tested and ready for installation.
The components shall be as follows:
The BOILER shall bear the ASME "H" stamp for 160 psi working pressure and shall be National Board listed. There shall
be no banding material, bolts, gaskets or "O" rings in the header configuration. The 316L stainless steel combustion chamber
shall be designed to drain condensation to the bottom of the heat exchanger assembly. A built-in trap shall allow
condensation to drain from the heat exchanger assembly. The complete heat exchanger assembly shall carry a ten (10) year
limited warranty.
The BOILER shall be certified and listed by C.S.A. International under the latest edition of the harmonized ANSI Z21.13
test standard for the U.S. and Canada. The BOILER shall comply with the energy efficiency requirements of the latest
edition of the ASHRAE 90.1 Standard and the minimum efficiency requirements of the latest edition of the BTS2000
Standard. The BOILER shall operate at a minimum of 93% thermal efficiency at full fire on 399,999 and 500,000 Btu/hr
models and at a minimum 94% thermal efficiency at full fire on 600,000, 700,000 and 800,000 Btu/hr models. All models
shall operate up to 98% thermal efficiency with return water temperatures at 100°F or below. The BOILER shall be certified
for indoor installation. The BOILER’s Thermal Efficiency shall be verified through third party testing by the Hydronics
Institute Division of AHRI and listed in the AHRI Certification Directory.
The BOILER shall be constructed with a heavy gauge steel jacket assembly, primed and pre-painted on both sides. The
combustion chamber shall be sealed and completely enclosed, independent of the outer jacket assembly, so that integrity of
the outer jacket does not affect a proper seal. A burner/flame observation port shall be provided. The burner shall be a
premix design and constructed of high temperature stainless steel with a woven metal fiber outer covering to provide
modulating firing rates. The BOILER shall be supplied with a gas valve designed with negative pressure regulation and be
equipped with a variable speed blower system, to precisely control the fuel/air mixture to provide modulating boiler firing
rates for maximum efficiency. The BOILER shall be capable of full modulation firing down to 20% of rated input with a
turndown ratio of 5:1. The BOILER shall operate in a safe condition at a de-rated output with gas supply pressures as low as
4 inches of water column.
The BOILER shall utilize a 24 VAC control circuit and components. The control system shall have an electronic display
for boiler set-up, boiler status, and boiler diagnostics. All components shall be easily accessed and serviceable from the front
and top of the jacket. The BOILER shall be equipped with a temperature/pressure gauge; high limit temperature control with
manual reset; ASME certified pressure relief valve set for 50 psi; outlet water temperature sensor; return water temperature
sensor; outdoor air sensor, flue temperature sensor; flow switch.
The BOILER shall feature the “Smart System” control with a 2-line, 16 character LCD display, password security, pump
delay with freeze protection, pump exercise, domestic hot water prioritization and PC port connection. The BOILER shall
allow 0-10 VDC input connection for BMS control and have built-in “Cascade” to sequence and rotate while maintaining
modulation of up to eight boilers without utilization of an external controller. Supply voltage shall be 120 volt/60 hertz/
single phase.
The BOILER shall be equipped with two terminal strips for electrical connection. A low voltage connection board with 28
data points for safety and operating controls, i.e., Auxiliary Relay, Auxiliary Proving Switch, Manual Reset Low Water
Cutoff, Flow Switch, High and Low Gas Pressure switches, Tank Thermostat, Wall Thermostat/Zone Control, System Supply
Sensor, Outdoor Sensor, Building Management System signal and Cascade control circuit. A high voltage terminal strip
shall be provided for Supply voltage. The high voltage terminal strip plus integral relays are provided for independent pump
control of the System pump, the Boiler pump and the Domestic Hot Water pump. The dry pump contacts shall be sized for
up to 1.5 hp/120V, 3 hp/240V or 30 amp pumps.
The BOILER shall be installed and vented with a (select one):
(a) Direct Vent Sidewall system with a horizontal sidewall termination of both the vent and combustion air. The flue shall
be PVC, CPVC or Stainless Steel sealed vent material terminating at the sidewall with the manufacturers specified vent
termination. A separate pipe shall supply combustion air directly to the BOILER from the outside. The air inlet pipe may
be PVC, CPVC, ABS, Galvanized, Dryer Vent, or Stainless Steel sealed pipe. The air inlet must terminate on the same
sidewall with the manufacturer’s specified air inlet cap. The BOILER’s total combined air intake length shall not exceed 100
equivalent feet. The BOILER’s total combined exhaust venting length shall not exceed 100 equivalent feet. Foam Core
pipe is not an approved material for exhaust piping.
(b) Direct Vent Vertical system with a vertical roof top termination of both the vent and combustion air. The flue shall be
PVC, CPVC or Stainless Steel sealed vent material terminating at the roof top with the manufacturers specified vent
termination. A separate pipe shall supply combustion air directly to the BOILER from the outside. The air inlet pipe may be
PVC, CPVC, ABS, Galvanized, Dryer Vent, or Stainless Steel sealed pipe. The air inlet must terminate on the roof top with
the manufacturer’s specified air inlet cap. The BOILER’s total combined air intake length shall not exceed 100 equivalent
feet. The BOILER’s total combined exhaust venting length shall not exceed 100 equivalent feet. Foam Core pipe is not an
approved material for exhaust piping.
(c) Sidewall Vent with Room Air system with a horizontal sidewall termination of the vent with the combustion air drawn
from the interior if the building. The flue shall be PVC, CPVC or Stainless Steel sealed vent material terminating at the
sidewall with the manufacturers specified vent termination. . The BOILER’s total combined exhaust venting length shall not
exceed 100 equivalent feet. Foam Core pipe is not an approved material for exhaust piping.
(d) Vertical Vent with Room Air system with a vertical rooftop termination of the vent with the combustion air drawn from
the interior of the building. The flue shall be PVC, CPVC or Stainless Steel sealed vent material terminating at the rooftop
with the manufacturers specified vent termination. The BOILER’s total combined exhaust venting length shall not exceed
100 equivalent feet. Foam Core pipe is not an approved material for exhaust piping.
(e) Vertical Vent with Sidewall Air system with a vertical rooftop termination of the vent with the combustion air being
drawn horizontally from a sidewall. The flue shall be PVC, CPVC, or Stainless Steel sealed vent material terminating at the
roof top with the manufacturers specified vent termination. A separate pipe shall supply combustion air directly to the POOL
HEATER from the outside. The air inlet may be PVC, CPVC, ABS, Galvanized, Dryer Vent, or Stainless Steel sealed pipe.
The air inlet must terminate on a sidewall using the manufacturers specified air inlet cap. The BOILER’s total combined air
intake length shall not exceed 100 equivalent feet. The BOILER’s total combined exhaust venting length shall not exceed
100 equivalent feet. Foam Core pipe is not an approved material for exhaust piping.
The BOILER shall have an independent laboratory rating for Oxides of Nitrogen (NO x) of 20 ppm or less corrected to 3%
O2. The manufacturer shall verify proper operation of the burner, all controls and the heat exchanger by connection to water
and venting for a factory fire test prior to shipping.
The BOILER shall operate at altitudes up to 4,500 feet above sea level without additional parts or adjustments.
The BOILER shall be suitable for use with polypropelene glycol, up to 50% concentration without contingencies.
Maximum unit dimensions shall be: Length ________inches, Width ________inches and Height __________ inches.
Maximum unit weight shall be_________pounds.
The Firing Control System shall be ______ (Options Below).
M9
M13
Direct Spark Ignition with Electronic Supervision (Standard)
GE GAP (FM/IRI/CSD-1) (XP 500-800)
OPTIONAL CONSTRUCTION CODES
The BOILER shall be constructed in accordance with ______ requirements. (Options Below)
M7
MA
KY
California Code
Massachusetts Code
Kentucky Code
Note: Due to the large discrepancy in CSD-1 requirements from state to state, please confirm to the factory all
controls required in your jurisdiction.
The SHELL AND TUBE HEAT EXCHANGER shall have a working pressure of 87 psi and shall be constructed of CuproNickel Tubes and Bronze Headers and carry a one (1) year limited warranty. The EXTERNAL HEAT EXCHANGER shall
be sized so that heat can be transferred into the pool water with an efficiency of up to 99%. The entire assembly shall be
mounted on “I” beam skids to facilitate handling and installation.
The CIRCULATING PUMP shall be constructed of cast iron and operate on a 120 volt, 60 Hz, 1 phase power supply
(unless otherwise specified). The pump shall be factory wired to run with intermittent pump operation
The EXPANSION TANK shall be of a bladder type design and shall be sized adequately to allow for the expansion of the
boiler water when heated.
The FLOW SWITCH shall be of a paddle type design and shall be wired to the internal boiler control safety circuitry so to
not allow the boiler to operate when there is not sufficient flow.
The AUTOMATIC FILL VALVE WITH PRESSURE REDUCER shall be factory set for 15 psi and shall allow fresh
water to be added to the boiler system only when the water pressure has fallen below the pressure setting.
The PRESSURE RELIEF VALVE shall be ASME Certified and have a setting of 50 psi
The TEMPERATURE AND PRESSURE GAUGE shall be capable of reading temperature in both degrees Fahrenheit and
degrees Celsius. The Pressure units shall be read in pounds per square inch (psi)
2/10 – Printed in U.S.A.