Scalding Danger Protection; Supply And Return Connections And Pressure Relief Valve; Temperature Limiting Device (Dhw); Drain Valves (Dhw) - Slant/Fin VHG-100-CH Installation And Service Manual

Scalding danger protection

Figure 7.13
Water Temperature °F
110
116
122
131
140
149
154
Source: United States Product Safety Commission
Table 7.2
Hot water Scald burn warning for infants, children, and elderly - great care must be
taken when exposing infants, children, or the elderly to warm or hot water as they can
be badly burned quickly and at shorter exposure times. A temperature limiting device
NOTICE
(anti-scald valve) is required (as per ASSE 1070).

Supply and return connections and pressure relief valve.

A pressure relief valve (not provided) is required on the domestic water outlet side of the boiler for safety purposes
Use T-pieces for externally mounting the pressure relief valve and the boiler drain valve for servicing the boiler.
Do not use chloride-based fluxes for soldering any pipes of the water system. A DHW pressure relief valve is
included in the accessory plumbing kit for the combi boiler, the kit is highly recommended for all installations. The
DHW combi boiler connections on the boiler need to be increased in size through the use of a bushing or coupling
before any piping is installed. All boilers come from the factory with 1/2" NPT connections for combi DHW. The
connections size needs to be increased to 3/4" for correct operation of the boiler. If a slantfin plumbing kit is used
all the the bushing and piping is correctly sized and provided with the kit. (See §5.1 and §5.2 for part numbers)

Temperature limiting device (DHW)

For VGH-CO boilers a temperature limiting device (anti-scald valve) is required for prevention of scalding hazards.
The temperature limiting device (as per ASSE 1070) must be installed in accordance with local and national
plumbing codes. Additional temperature limiting devices may be required at the domestic water fixtures in the
dwelling.

Drain valves (DHW)

For a VGH-CO boiler a drain valve must be installed immediately before the domestic cold-water inlet connection
as well as immediately after the domestic hot water outlet connection. This allows for easy flushing and descaling
of the plate heat exchanger. Use T-pieces for externally mounting drain valves. The Slant/Fin plumbing kit for the
combi boiler includes a service valve kit that allows for the flushing of the plate heat exchanger.

Shutoff valves (DHW)

One shutoff valve should be placed before the water inlet drain valve and one should be placed after the water
outlet drain valve in order to isolate the rest of the DHW system.
Do not place a shutoff valve between the pressure relief valve and the boiler.
•
Water temperatures over 125 °F (52 °C) can cause severe burns
instantly, or death from scalds.
•
Children, the disabled and the elderly are at the highest risk of being
scalded.
•
Feel water before bathing or showering.
•
Read this manual entirely before setting temperature for domestic hot
water points.
Time for 1
Normal Shower Temp
35 Minutes
5 Seconds
2 Seconds
Instantaneous
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
st
Degree Burn
1 Minute
1 Second
Time for Permanent Burns
nd rd
2 & 3 Degree
-
45 Minutes
5 Minutes
25 seconds
5 Seconds
2 Seconds
1 Second
39