Primera 400B Installation & Maintenance Manual page 14

Important For Hydronic Heating Applications:
1. Design flow rate is the maximum allowable and recommended flow through the heat exchanger on each individual
boiler. This flow rate must not be varied on models 1200B, 1600B and 2000B. For all other models of PRIMERA
boilers, system designers are strongly urged not to deviate from the design flow rate.
2. If connecting one or more PRIMERA
circulator, consult Riverside Hydronics for recommendation on piping and flow rates.
3. Pumps supplied for hydronic heating applications may be cast iron, bronze or bronze fitted.
4. The System Designer must confirm proper sizing of the circulating pump by calculating total head loss through the
primary loop piping, valves, fittings and the boiler at the boiler design flow rate.
Important For Water Heater Applications:
1. Design flow rate is the required flow rate for domestic water heating applications. Do not deviate above or below
this flow rate, as erosion or scaling of the heat exchanger may result.
2. Chart information is acceptable for water hardness up to 16 grains (272 ppm). Otherwise, consult factory.
3. Maximum heater-to-tank recirculation piping length - When supplied from the factory with a standard pump, the
pump sizing is based on the following number of tank to heater 2" (2-1/2" required for 1000W, 1000B, 2000W and
2000B) copper pipe recirculation loop fittings (for longer runs or more fittings, consult factory):
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
6 – 90 elbows (or 12 – 45

2 – bypass tees

4 – unions
Not more than 45 total feet of straight 2" (2-1/2" for models 1000 and 2000) pipe (DEDUCT 5 FEET from
maximum allowable straight pipe in heater to tank circulating loop for every elbow and tee in excess of those
shown above.)
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4. If the PRIMERA is ordered with the "No Pump" option, the System Designer must properly size an all bronze
circulating pump by calculating the total head loss through the through the heater-to-tank piping, valves, fittings
and water heater at the required water heater design flow rate.
Filling the Unit
1. Fill the system with water. To be sure that the unit is not "air bound," open the relief valve. Leave the valve open
until a steady flow of water is observed. Close valve and complete filling the system.
2. In hard water areas, water treatment should be used to reduce introduction of minerals into the system. Minerals
in the water can collect in the tubes and cause noise during operation. Proper temperature rise must be
maintained. Excessive buildup of minerals in the heat exchanger can cause a non-warrantable failure. Water must
not be softened below a hardness of 2 grains, as water softened below this point becomes very aggressive and
can cause a non-warrantable heat exchanger failure.
3. Make sure there are no system leaks. DO NOT use petroleum based stop-leak products. All system leaks must be
repaired. The constant addition of make-up water to a closed loop boiler system can cause minerals to collect in
the heat exchanger. Excessive buildup of minerals in the heat exchanger can cause a non-warrantable failure.
4. If freeze protection is required on a boiler connected to an indirect coil, DO NOT use undiluted or automotive type
antifreeze. Use only hydronic system antifreeze, following the manufacturer's instructions.
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boilers to a heating loop that has variable flow rate pumping on the main
o

elbows) 2 - ball valves (full port type) for service shutoff and balancing

1 - ball valves (full port type) and bypass piping

1 - cold domestic makeup water tee (if required)
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34-50 04/02/2010