Camus Hydronics DFH/W1100 Installation, Operation And Service Manual - page 68
63
•
Caution - A mechanical room operating under a
negative pressure may experience a downdraft in the
flue of an appliance that is not firing. The cold outside
air may be pulled down the flue and freeze a heat
exchanger. This condition must be corrected to provide
adequate freeze protection.
•
Freeze protection for the appliance using an indirect
coil can be provided by using hydronic system
antifreeze. Follow the manufacturer’s instructions. DO
NOT use undiluted or automotive type antifreeze.
•
Shut-down and draining - If for any reason, the unit is
to be shut off in a space where danger of freezing
exists, the following precautionary measures must be
taken:
o
Shut off gas supply.
o
Shut off water supply.
o
Shut off electrical supply.
o
Drain the main exchanger and the secondary
exchanger, if supplied, completely.
o
Ensure that the pump and connecting piping are
fully drained.
10.15 FREEZE PROTECTION FOR A HEATING
BOILER SYSTEM (Optional)
•
Use only properly diluted inhibited glycol antifreeze
designed for hydronic systems.
•
Follow
the
instructions
from
the
antifreeze
manufacturer. Quantity of antifreeze required is based
on total system volume including expansion tank
volume.
•
Antifreeze is denser than water and changes the
viscosity of the system. The addition of antifreeze will
decrease heat transfer and increase frictional loss in
the boiler and related piping.
Where antifreeze has
been used, to maintain the temperature rise across the
appliance confirm that the recommended GPM for pure
water has been increased by 15% and the head loss
by 20%.
•
Local codes may require a back flow preventer or
actual disconnect from city water supply when
antifreeze is added to the system.
•
When filling or topping-up the system with water mixed
with the antifreeze always used distilled or RO (reverse
osmosis) water. This will prevent the reaction of the
water with antifreeze which can create sludge.
PART 11 INSTALLATIONS
11.1
HEATING BOILER INSTALLATIONS
The appliance MUST always be installed in a
primary/secondary 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 15 PSIG
cold. Pressure will rise when hot. Expansion tank sizing will
determine the pressure when the system is hot. Do not
operate the system at less than 30 PSIG when hot. 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 4.12.
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.
11.2
WATER CONNECTIONS
Copper and copper-nickel heat exchanger models have FIP
inlet and outlet bronze connections. Stainless steel heat
exchanger models have groove locked inlet and outlet
stainless steel connections. Pipe size must be in
accordance with Table 5 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.
11.3
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 supply
and return side piping and will be used for isolation only.
The ball valves must be the same diameter as the installed