Install Instructions

Page 17
NEOTHERM Residential Boilers
HIGH EFFICIENCY RESIDENTIAL BOILERS
®
When the pump is supplied by the units manufacturer, the
boiler must be located within 15 feet (4.6m) of the supply
and return header (or the hydraulic separator). Pumps
supplied by Manufacturer are sized for a maximum of 30
feet (9.1m) of connection size piping and the headloss of
the boiler only. (See Table 13.)
If longer pipe lengths are required, the pump should
be sized for the boiler and for the piping it will serve,
and should be supplied to the job separately. Even with
pumps supplied by others, the units manufacturer strongly
recommends primary-secondary piping.
6.B Boiler Cold Water Make-Up
1. Connect the cold water supply to the inlet connection
of an automatic ll valve.
2. Install a suitable back ow preventer between the
automatic ll valve and the cold water supply.
3. Install shut o󰀨 valves where required.
The boiler piping system of a hot water heating boiler
connected to heating coils located in air handling
appliances where they may be exposed to refrigerated air
circulation must be equipped with ow control valves or
other automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
A boiler installed above radiation level, or as required by
the authority having jurisdiction, must be provided with a
low water cuto󰀨 device either as a part of the boiler or at
the time of boiler installation.
BOILER PIPE SIZE,
SIZE INCHES
80 1
105 1
150 1
210 1¼
Table 14. - Water Connection
Pipe Sizes
SECTION 6 WATER CONNECTIONS
6.A Boiler System Piping - Hot Supply
Connections
NOTE: This unit must be installed in a closed pressure
system with a minimum of 12 psi (82.7kPa) static
pressure at the boiler.
Hot water piping should be supported by suitable hangers
or oor stands. Do not support piping with this boiler. Due
to expansion and contraction of copper pipe, consideration
should be given to the type of hangers used. Rigid hangers
may transmit noise through the system resulting from
the 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 a drain
or in a manner to prevent injury in the event of pressure
relief. Install an air purger, an air vent, a diaphragm-
type expansion tank, and a hydronic ow check in the
system supply loop. Minimum ll pressure must be 12psig
(82.7kPa). Install shuto󰀨 valves where required by code.
Your units e󰀩ciency will be higher with lower return
water temperatures. Therefore, to get the most of low return
temperature with multiple boilers, pipe as shown in Figure 9
through Figure 15.
Unit Heater models 150-500 can be ordered with or without
a pump included.
Boiler models 80-500 can also be ordered with or without a
pump included.
Unit with a pump MUST be piped in a primary-secondary
fashion (using either piping or a hydraulic separator) such
that the pump that is mounted on the boiler ONLY serves
the boiler.