Camus Hydronics DRH300, Installation, Operation And Service Manual

Page: 66 / 87

60
WARNING
The condensate collection box must be filled with water to
prevent flue gas emissions from escaping during boiler
operation.
11.4 HEATING BOILER INSTALLATIONS
The appliance MUST always be installed in a
primary/secondary reverse return piping system for
proper operation. Before beginning the installation,
consult local codes for specific plumbing requirements. The
installation should provide unions and valves at the inlet
and outlet of the appliance so it can be isolated for service.
An air separation device must be supplied in the installation
piping to eliminate trapped air in the system. Locate a
system air vent at the highest point in the system. The
system must also have a properly sized expansion tank
installed. Typically, an air charged diaphragm-type
expansion tank is used. The expansion tank must be
installed close to the boiler and on the suction side of the
system pump (appliance Inlet) to ensure proper operation.
Caution: This appliance should not be operated at less than
30 PSIG. Water piping must be supported by suitable
hangers or floor stands, NOT by the appliance. Pipe
systems will be subject to considerable expansion and
contraction. Pipe supports could allow the pipe to slide
resulting in noise transmitted into the system. Padding is
recommended. The boiler pressure relief valve must be
piped to a suitable floor drain. See Section 4.10.
CAUTION
1) A leak in a boiler “System” will cause the “System” to
intake fresh water constantly, which may cause the
tubes to accumulate a lime/scale build up. This will be
a NON-WARRANTABLE FAILURE.
2) If boiler pumps are not operated when treated water
is introduced, a corrosion cell may be created in the
boilers leading to a failure which is not covered by
warranty.
3) Target water quality of treated water to be stable and
neutral with regards to corrosive/scaling properties.
Damage to or failure of the heat exchanger as a
result of scaling or corrosive water quality is not
covered by warranty.
11.5 WATER CONNECTIONS
All models have groove locked inlet and outlet stainless
steel connections. Pipe size must be in accordance with
Table 3 and, between supply and return lines, must not
exceed 80 feet of equivalent length. Any reduction in
recommended pipe size may decrease flow resulting in
high water temperatures, boiler noise, flashing to steam
and non-warrantable heat exchanger damage.
11.6 PIPING LENGTHS
The appliance circulator provides the water flow from the
primary boiler piping, through the boiler and back to the
primary system. Pipe diameter and length are critical to
ensure proper flow through the boiler.
The secondary loop piping to and from the appliance must
have a fully ported ball valve installed in both the inlet and
outlet side piping and will be used for isolation only. The
ball valves must be the same diameter as the installed
piping. If flow control is required, other means of flow
control such as globe valve or flow setter should be used.
11.7 INTERMITTENT PUMP OPERATION
An intermittent pump operation signal is standard and can
be used to operate a separate pump contactor. A 1/6 hp
pump delay relay is standard, and a 1 hp pump delay relay
is available. When utilizing this feature, the boiler’s integral
circulating pump will cycle on at each call for heat, before
the burner fires. The pump will continue to operate while
the burner is firing. The pump will run for a post-pump
period after the temperature set point is satisfied. This will
remove any residual heat from the combustion chamber
before turning the pump off. See wiring diagram shipped
with the unit.
11.8 SUMMARY
a) Typical Boiler Installations
General Plumbing Rules
1 Check all local codes.
2 For serviceability of boiler, always install
unions.
3 Always pipe pressure relief valve to an open
drain.
4 Locate system air vents at highest point of
system.
5 Expansion tank must be installed near the
boiler and on the suction side of the system
pump.
6 Support all water piping.
b) Placing the Boiler in Operation
Pre-Start Check List
1
Review the location of the boiler, clearances
from combustible surfaces and available service
clearances.
2 Review Part 2 Venting. Ensure that all vent
components are fabricated from the correct
category of materials with adequate clearance
from combustibles.
3 Ensure that the boiler condensate drain and all
vent system condensate drains are properly
routed to an acceptable floor drain or
neutralization system.
4 Review the vent termination point for proper
location and clearances.
5 Ensure that proper volumes of combustion and
ventilation air are provided to the mechanical
room. If a separate combustion air pipe is used,
ensure that it is properly sized, sealed and
terminated.
6 Review the water piping from the boiler to the
system. The boiler must be installed in a
primary/ secondary piping system. Review the
diameter and equivalent length of the installed
piping to and from the boiler for proper flow.
7 Ensure that a properly sized primary system
pump is installed with an expansion tank.
8 Check system pressure. Ensure a minimum of
30 PSIG with the system hot and not more than
90% of the rated pressure of the relief valve.
9 Review the installed gas piping from the meter
to the boiler. Ensure that the gas pipe, meter
and any regulators are adequately sized.
10 Review the field wiring and electrical service for
both the boiler controls and pump. Ensure that
the electrical service(s) is adequately sized.