LP-551 Rev. 3.9.16
6
NEVER use any toxic chemical, including automotive, standard
glycol antifreeze, or ethylene glycol made for hydronic (non-
potable) systems. These chemicals can attack gaskets and seals
in water systems, are poisonous if consumed, and can cause
personal injury or death.
UNCRATING THE BOILER
- Any claims for damage or
shortage in shipment must be filed immediately against the
transportation company by the consignee.
Households with small children, disabled, or elderly persons
may require a 120
o
F or lower temperature setting to prevent
severe personal injury or death due to scalding.
F. Water Temperature Adjustment
If the boiler is going to have a set temperature above 120
o
F, you
must use an ASSE 1017 rated mixing valve to avoid severe burns
or death from scalding temperatures.
Approximate Time / Temperature Relationships in Scalds
120
o
F
More than 5 minutes
125
o
F
1 1/2 to 2 minutes
130
o
F
About 30 seconds
135
o
F
About 10 seconds
140
o
F
Less than 5 seconds
145
o
F
Less than 3 seconds
150
o
F
About 1 1/2 seconds
155
o
F
About 1 second
Table 1 - Approximate Time / Temperature Relationships in Scalds
Part 2 - Before You Start
Components (and Part #) included with the boiler:
•
Temperature and Pressure Gauge (7250P-499)
•
Pressure Relief Valve (7450P-254)
•
Intake PVC Tee with Screens
•
Exhaust PVC Coupling with Screens
•
Outlet Combination Fitting (220 Model - 7450P-235,
299/301 Models - 7450P-236, 399 Model - 7450P-237)
•
Flow Switch and Paddles (7250P-517)
•
Installation Manual and Warranty
A. What’s in the Box
Remove all sides of the shipping crate of the boiler.
VWH units must be connected to a storage tank. You must not
have a direct connection of the potable water system into the
heat exchanger. This could cause flow issues, short cycling,
and an increase of mineral build-up in the unit. This system is
designed to have incoming potable water flow through the
storage tank first, then through the heat exchanger. Damages
resulting from incorrect installation or from use of products not
approved by HTP, Inc. ARE NOT covered by warranty.
•
CSD-1 Form
•
H-3 Data Sheet
B. How the Boiler Operates
Elite Premier VWH® condensing technology intelligently
delivers large amounts of hot water while maximizing
efficiency. Outlined below are the features of the system and
how they operate:
Stainless Steel Heat Exchanger
The highly efficient stainless steel heat exchanger is designed
to use the cold water return from the storage tank and extract
the last bit of heat before it is exhausted.
Modulating Combustion System
The combustion system modulates the output of the burner
during operation to match system demand and achieve
the control set point while in operation. The set point can
change by internal or external signals to enhance the overall
performance of the system.
Control
The integrated control system monitors the system and
regulates fan speed to control boiler output. This allows the
boiler to deliver only the amount of heat energy required and
nothing more.
The control can regulate the output of multiple boilers
through its cascade system function. The cascade system is
capable of connecting up to eight boilers together in such a
way that they function as one boiler system. This allows for
greater turn down ratios and provides systematic control of
the multiple boilers in an installation to minimize downtime
and maximize efficiency.
The cascade system works by establishing one boiler as the
master and the other connected boilers as followers. The
master boiler requires a sensor to provide feedback on set
point temperature in order to adjust heating input from the
connected boilers. Each cascaded boiler will have its own
pump to provide maximum flow and control heat exchanger
flow rate.
Text Display and Operational LED Light Indicators
The display allows the user to change system parameters and
monitor system outputs.
Gas Valve
Senses suction from the blower, allowing gas to flow only if
powered and combustion air is flowing.
All Metal Integrated Venturi
Controls air and gas flow into the burner.
Burner
The high grade stainless steel burner uses premixed air and
gas to provide a wide range of firing rates.
Spark Ignition
The burner is ignited by applying high voltage through the
system spark electrode. The spark from the electrode ignites
mixed gas off of the burner.
Supply Water Temperature Sensor
This sensor monitors the boiler outlet water temperature
(System Supply). The control adjusts boiler firing rate so the
supply temperature will match the boiler set point.
Return Water Temperature Sensor
This sensor monitors boiler return water temperature (System
Return).
Failure of the boiler due to freeze related damage IS NOT
covered by product warranty.
Summary of Contents for EP-220 VWH
Page 33: ...LP 551 Rev 3 9 16 33 Figure 24 Cascade Master and FollowerWiring ...
Page 34: ...LP 551 Rev 3 9 16 34 Figure 25 Internal Connection Diagram ...
Page 57: ...LP 551 Rev 3 9 16 57 Figure 30 Combustion System Replacement Parts 220kBTU Model ...
Page 58: ...LP 551 Rev 3 9 16 58 Figure 31 Combustion System Replacement Parts 299 399kBTU Models ...
Page 59: ...LP 551 Rev 3 9 16 59 Figure 32 Replacement Parts All Models ...
