Table of Contents
Advertisement
CAUTION
The heat exchanger has a
small amount of combustion
chamber insulation (refractory),
which contains ceramic fibers.
When exposed to extremely
high temperatures, the ceramic
fibers, which contain crystalline
silica, can be converted
into cristobalite - which is
classified as a possible human
carcinogen.
Care should be taken to
avoid disturbing or damaging
the refractory. If damage
occurs, contact the factory for
directions.
Avoid breathing and contact
with skin and eyes and follow
these precautions:
1. For conditions of frequent
use or heavy exposure,
respirator protection is
required. Refer to the
"NIOSH Guide to the
Selection and Use of
Particulate Respirators
Certified under 42 CFR
84" for selection and use
of respirators certified by
NIOSH.
For the most current
information, NIOSH can be
contacted at 1-800-356-4676
or on the web at
www.cdc.gov/niosh.
2. Wear long sleeved, loose
fitting clothing, gloves and
eyes protection.
3. Assure adequate
ventilation.
4. Wash with soap and water
after contact.
5. Wash potentially
contaminated clothes
separately from other
laundry and rinse washing
machine thoroughly.
6. Discard used insulation in
an air tight plastic bag.
NIOSH stated first aid:
• Eye contact - Irrigate and
wash immediately.
• Breathing - Provide fresh
air.
4-2
DC SERIES BOILERS / WATER HEATERS DC 15-95, DC 15-96, DC 20-125, DC 33-160
4.1.6 Heat Exchanger
During annual inspection (with the heat exchanger cover removed), examine the
heat exchanger for signs of contamination and clean if necessary. In areas of
poor gas quality or contaminated combustion air, there may be a buildup of black
plaque (typically sulfur). Other fouling agents: airborne dust, debris and volatiles.
Clean the heat exchanger surface with a stiff plastic bristle brush only.
Inspect the heat exchanger gasket for signs of discoloration or brittleness. Replace
as needed. Refer to heat exchanger cover removal instructions in Section 3.5.1
for access to combustion chamber and heat exchanger. Note that the safety
warning regarding burner refractory on this page must be observed.
4.1.7 Pump
Check that the pump is on in normal space heating operation and that the water
Delta T is reasonable for the heating application. See 1.6.3 about bleeding air from
the pump.
4.1.8 Gas Piping
Check for damage or leaks and repair as needed.
4.1.9 Control Module
•
Check that boiler / water heater operation is consistent with the steps in
Section 2.7 Sequence of Operation.
•
Check that water temperature targets and setpoint are satisfactory and have
not been adversely amended.
•
Check that the domestic hot water generation is performing as expected.
Fouling of the interior of the domestic heating coil can cause poor performance.
4.1.10 Water Heating System
•
Check water pressure and temperature. There should be no noticeable change
if boiler / water heater and system components are functioning normally. Check
for any noise in the system.
•
Check heating system water piping for damage or leaks and repair as needed.
•
Check for 12-15 psig in normal operation, and look to ensure pressure does not
run up toward 30 psig at high temperature. If pressure rises sharply, consider
replacement of expansion tank. Check also for noise at high fire, which may
signal water quality problems.
•
Water chemistry shall be of a quality generally accepted as suitable for
hydronic applications. See Section 1.6 for details.
•
Ensure any direct "city fill" water connections are left in the closed position to
minimize exposure to leaks and flooding.
4.1.11 Freeze Protection
The boilers / water heaters control will operate the boiler / water heater to protect
the boiler / water heater from freezing. If the boiler / water heater and system
components are subject to possible freezing condition then a freeze protection
solution is recommended. Check freeze protection. Use only antifreeze made
specifically for hydronic systems. Inhibited propylene glycol is recommended.
Antifreeze concentration must be between 25% and 50% of the total volume of
water in the system.
INSTALLATION AND OPERATION INSTRUCTIONS
Hide quick links:
Advertisement
Table of Contents
