Plumbing - Westinghouse 220VWH Manual

20
Chemical imbalance of the water supply may affect efficiency and
cause severe damage to the appliance and associated equipment.
Water quality must be professionally analyzed to determine whether
it is necessary to treat the water. Various solutions are available to
adjust water quality. Adverse water quality will affect the reliability
of the system. In addition, operating temperatures above 135
accelerate the build-up of lime scale and possibly shorten appliance
service life. Failure of an appliance due to lime scale build-up, low
pH, or other chemical imbalance IS NOT covered by the warranty.
The water must be potable, free of corrosive chemicals, sand, dirt, and
other contaminates. It is up to the installer to ensure the water does
not contain corrosive chemicals or elements that can damage the
heat exchanger. Potable water is defined as drinkable water supplied
from utility or well water in compliance with EPA secondary maximum
contaminant levels (40 CFR Part 143.3) as shown in the table below.
If the water contains contaminants higher than outlined by the EPA,
water treatment is recommended and additional, more frequent
maintenance may be required.
If you suspect that your water is contaminated in any way, discontinue
use of the appliance and contact an authorized technician or licensed
professional.
Maximum
Contaminant Allowable
Level
Total Hardness
(Commercial
120 mg/l
o
Use - 140 F and
(7 grains/gallon)
above water
temperature)
Aluminum 0.05 to 0.2 mg/l
Chloride 100 mg/l
Copper 1 mg/l
Iron 0.3 mg/l
Manganese 0.05 mg/l
*NOTE: It is recommended to clean heat exchanger at least once a year
to prevent lime scale buildup. Follow the maintenance procedure in
the Maintenance Section of this manual to clean the heat exchanger.
Piping Components
Water Heating System Piping
System piping MUST be sized per technical pipe requirements listed
in Tables 11, 12, and 13. Reducing pipe size can restrict flow rate
through the boiler, causing inadvertent short cycling and poor system
performance.
Check Valves
Field supplied. Check valves are recommended for installation as
shown in Applications.
Isolation Valves
Field supplied. Full port ball valves are required. Failure to use full port
ball valves could result in a restricted flow rate through the boiler.
Anti-Scald Mixing Valve
Field supplied. An anti-scald mixing valve is recommended when
storing domestic hot water above 115°F.
Unions
Field supplied. Recommended for unit serviceability. DO NOT USE
DIELECTRIC UNIONS! ONLY BRASS, COPPER, OR STAINLESS STEEL.
Pressure Relief Valve
Factory supplied on boiler. The pressure relief valve is sized to ASME
specifications. Storage tank may require additional relief valves
depending on local codes.
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
o
F will
Maximum
Contami-
Allowable
nant
Level
pH 6.5-8.5
Sulfate 205 mg/l
Total
Dissolved 500 mg/l
Solids (TDS)
Zinc 5 mg/l
Dissolved
15 mg/l or
Carbon
PPM
Dioxide (CO2)
Minimum VWH Pipe Sizes
220
299 / 301
399
Table 13 - Minimum Pipe Sizes
I. Plumbing
The boiler is designed to function in an open loop hot water supply
system. We have included a temperature and pressure gauge
that allows the user to monitor the system pressure and outlet
temperature from the boiler. It is important to note that the boiler
has a minimal amount of pressure drop and must be calculated when
sizing the circulators.
Install the boiler so the gas ignition system components are protected
from water (dripping, spraying, etc.). Allow clearance for basic service
of boiler circulator, valves and other components.
Observe the minimum 1" clearance around all uninsulated hot
water pipes when openings around pipes are not protected by non-
combustible materials.
Basic steps are listed below, with illustration that will guide you
through the installation of the boiler.
1. Connect the system return marked "Boiler Return".
2. Connect the system supply marked "Boiler Supply".
3. Install a circulator as shown in Applications (this manual). Make
sure the circulator is properly sized for the system and friction loss.
4. Install an expansion tank on the system supply. Consult the
expansion tank manufacturer's instruction manual (see Part 4,
Section D for water volume) for specific information relating to
expansion tank installation. Size the expansion tank for the required
system volume and capacity.
5. Install a drain valve at the lowest point of the system. Note: The
boiler cannot be drained completely of water without purging the
unit with an air pressure of 15 PSI.
6. The relief valve and temperature and pressure gauge are included
in the accessory kit. A discharge line should be installed 6" above the
drain in the event of a pressure relief. The pipe size must be the same
size as the relief valve outlet. NEVER BLOCK THE OUTLET OF THE
SAFETY RELIEF VALVE.
1" NPT
1 1/4" NPT
1 1/2" NPT