Installing A Domestic Hot Water (Dhw) System - Navien NCB-190/060H Installation & Operation Manual

3.1.3 Space Heating System Piping
When connecting the space heating system, follow
these guidelines:
Tighten the connection on the service valves with
●
care to avoid damage.
After installing the boiler, clean the strainer for
●
space heating return. Then, test the boiler for
proper space heating flow and inspect for leaks.
Instruct the boiler owner that the strainer must
be cleaned periodically to maintain proper space
heating water flow.
The Navien manifold system allows for easy
separation of the Boiler-Primary loop from the
System-Secondary loop(s). Refer to the following
illustration for a typical water piping example with a
Navien manifold system.
Space
Heating
Supply
Refer to the following illustration for
Note
details on installing the NCB-H Manifold
System (Part Number: 30026576A) to the
valve kits.
Also, check that a pipe, unions, gaskets, and valves
are all included in the Manifold kit. After installing
the manifold, ensure that the fittings, such as the
unions and gaskets, are properly sealed with the
pipe.
3.2 Installing a Domestic Hot
Water (DHW) System
The Navien NCB-H boiler provides domestic hot
water continuously when water flow is detected by
the flow sensor. This method is the most efficient
means of heating water by allowing the boiler
to operate at a lower return water temperature
by minimizing standby losses, thus increasing
combustion efficiency.
3.2.1 Guidelines for the DHW System
With its multi-purpose design, the Navien NCB-H
boiler provides hot water on demand. This means
that the boiler produces DHW only when the user
demands it. The boiler recognizes a DHW demand
when the flow sensor detects a DHW flow of
approximately 0.5 GPM or greater. Once the flow
sensor detects the flow, the boiler immediately goes
into DHW mode regardless of the status of the space
heating system. Read and follow the guidelines
Space
listed below to ensure safe and proper installation of
Heating
Return
a boiler heating system.
Scald Hazard
Hotter water increases the risk of scald injury.
There is a hot water scald potential if the DHW
temperature is set too high. Be sure to follow the
adjustment instructions in the boiler's operation
manual.
About the DHW Quality
Proper maintenance of the boiler is required when
water quality does not meet EPA standards. Damage
caused by poor water quality is not covered under
warranty. The following table shows the maximum
contaminant levels allowed, based on the EPA
National Secondary Drinking Water Regulations
(40 CFR Part 143.3). If you suspect that your water
is contaminated in any way, discontinue use of
the DHW and contact an authorized technician or
licensed professional.
Installing the System Piping 23