6b - water connections - ntv water heater, 6b.1 ntv water quality, 6b.2 piping requirements – LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual User Manual

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LAARS Heating Systems

6B.2 Piping Requirements

Water piping should be supported by suitable hangers and

floor stands. Do not support piping with the appliance. Due

to expansion and contraction of copper pipe, consideration

should be given to the type of hangers and supports used.

Rigid hangers may transmit noise through the system resulting

from piping sliding in the hangers. It is recommended that

padding be used when rigid hangers are installed. Maintain 1”

(2.5cm) clearance to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to the drain or

in a manner to prevent injury in the event of pressure relief.

Install a diaphragm-type expansion tank, flow check, and

shutoff valves where needed or as required by code.
NeoTherm 150-500 can be ordered with pumps. Whether the

factory pumps or other pumps are installed the piping should

be installed such that the pump supplies flow to the heater it

is attached to only. The factory pumps are sized for 30 feet

and 6 elbows of total pipe length, so the heater should be

placed within 15 feet of the tank. If longer runs are required, a

properly-sized field-supplied pump should be used.

Section 6B -

WATER CONNECTIONS -

NTV WATER HEATER

Section 6 is divided into two parts. Section

6A covers NTH units designed for hydronic

heating. Section 6B covers NTV models, which

are designed exclusively for “volume water”

domestic hot water applications. Refer to the

proper section for instructions on installing

and piping your product. Refer to Table 9 for

the connection pipe sizes required.

6B.1 NTV Water Quality

NTV water heaters must be installed in water conditions

of 10gpg hardness or less with a pH range of 8.2 to 9.5.

Operating the NTV in water with higher hardness levels will

cause heat exchanger fouling, erosion, or corrosion leading

to premature component failure, reduced efficiency, heat

exchanger failure or system failure. Failure of this type will

not be warranted. If the water in use exceeds the conditions

recommended, a water softener or other device should be

installed to improve water quality.

Figure 22 - DHW Piping, One Heater, One Vertical Tank

NOTES:

1. Optional CWMU & Recirc. line location.

2. Locate NTV DHW sensor or remote aquastat well

in lower 1/3 of tank.

3. Back flow preventer may be required - check local codes.

4. Thermal expansion tank may be required - check local codes.

5. Factory mounted pumps are sized for a max pipe length of

30’ total, 6-90° elbows, full pipe size.

6.

Caution: Pump sizing must be based on water hardness at job site.

WARNING: This drawing shows

suggested piping configuration and

valving. Check with local codes and

ordinances for additional requirements.

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