Laars NEOTHERM NTH Installation And Operation Instructions Manual

Also see for Neotherm NTH: Service manual Installation and operation instructions Installation and operation instructions User information Installation and operation instructions

Laars NEOTHERM NTH Installation And Operation Instructions Manual Manual pdf 21 page image

Page 17N EO THERM Boilers and Water HeatersNeoTherm’s efficiency is higher with lower returnwater temperatures. Therefore, to get the most of low returntemperature with multiple boilers, pipe as shown in Figures 17-19.NeoTherm NTV models 150-500 can be ordered with orwithout a pump included.NeoTherm NTH models 80-500 can also be ordered with orwithout a pump included.NeoTherm with a pump MUST be piped in a primary-secondary fashion (using either piping or a hydraulicseparator) such that the pump that is mounted on the boilerONLY serves the boiler.When the pump is supplied by Laars, the NeoTherm boilermust be located within 15 feet (4.6m) of the supply and returnheader (or the hydraulic separator). Pumps supplied by Laarsare sized for a maximum of 30 feet (9.1m) of connection sizepiping and the headloss of the boiler only. (See Table 7.)If longer pipe lengths are required, the pump should be sizedfor the boiler per Table 7 and for the piping it will serve,and should be supplied to job separately. Even with pumpssupplied by others, Laars strongly recommends primary-secondary piping.6A.2 NTH Cold Water Make-Up1. Connect the cold water supply to the inlet connection ofan automatic fill valve.2. Install a suitable back flow preventer between theautomatic fill valve and the cold water supply.3. Install shut off valves where required.The boiler piping system of a hot water heating boilerconnected to heating coils located in air handling applianceswhere they may be exposed to refrigerated air circulationmust be equipped with flow control valves or other automaticmeans to prevent gravity circulation of the boiler water duringthe cooling cycle.A boiler installed above radiation level, or as required by theauthority having jurisdiction, must be provided with a lowwater cutoff device either as a part of the boiler or at the timeof boiler installation.NTH PIPE SIZE, NTV PIPE SIZE,SIzE INCHES SIzE INCHES80 1 – n/a105 1 – n/a150 1 150 1¼210 1¼ 199 1¼285 1¼ 285 2399 1¼ 399 2500 1½ 500 2600 1½ 600 2750 2 750 2850 2 850 2Table 9 - Water Connection Pipe SizesSection 6A -WATER CONNECTIONS -NTH BOILERSection 6 is divided into two parts. Section6A covers NTH units designed for hydronicheating. Section 6B covers NTV models, whichare designed exclusively for “volume water”domestic hot water applications. Refer to theproper section for instructions on installingand piping your product. Refer to Table 9 forthe connection pipe sizes required.6A.1 NTH System Piping -Hot Supply ConnectionsNOTE: This appliance must be installed in a closedpressure system with a minimum of 12 psi (82.7kPa)static pressure at the boiler.Hot water piping should be supported by suitable hangers orfloor stands. Do not support piping with this appliance. Dueto expansion and contraction of copper pipe, considerationshould be given to the type of hangers used. Rigid hangersmay transmit noise through the system resulting from thepiping sliding in the hangers. It is recommended that paddingbe 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 a drain orin a manner to prevent injury in the event of pressure relief.Install an air purger, an air vent, a diaphragm-type expansiontank, and a hydronic flow check in the system supply loop.Minimum fill pressure must be 12psig (82.7kPa). Installshutoff valves where required by code.