ASSOCIATIONS
65
Industry has collaboratively
created a guideline that aims
to support plumbing installers
and manufacturers.
Table 1 advises those areas that are critical to the fixed
electrical water heating (geyser) cylinder failure. All
points of reference are to be verified with the relevant
manufacturer in terms of warranty conditions to alleviate
confusion/liability or uncertainty. PA
*Correct at the time of print
Table 1
1. Assembly of the system
1.1 All materials, pipes, fittings, components, and fixtures used shall be of an approved type (be able to provide proof that
the component complies to the relevant SANS standard) and must be listed on the JASWIC acceptance list.
1.2 Materials, pipes, fittings, components, and fixtures not installed as per the regulation and manufacturer’s guidelines.
1.3
1.4 Indoor hot water cylinder installed outside (must be identified on the cylinder)
Water heater cylinder serial plate has been tampered with or is missing.
1.5 Temperature and pressure valve not installed on the cylinder at the correct port.
2. Operation of the system
2.2
All the components of the system shall be installed in such a manner and position as to ensure the easy, effective, and
correct removal and replacement of component parts or spare parts during maintenance, replacement, or repair.
3. Pressure rating of the system
3.1
The rated pressure of the system exceeds a static pressure of 600kPa.
3.2 An expansion control valve not installed on closed hot water heating system.
3.3 The pressure control valves and expansion control valves shall have the same pressure rating. This pressure rating may
be less than the rated pressure of the storage water heater but shall never exceed it.
4. Hot and cold water delivery pressure
4.1
The various components of the system shall be so installed that the hot and cold water delivery pressure to water
mixing components is not balanced. The residual dynamic pressure at the fittings shall not vary by more than 20%.
6. Positioning of components
6.1
The storage water heater, the water storage tank (when relevant), and all operating components not installed in
positions where they shall be easily accessible for the purpose of replacement or maintenance.
Not placed on the tie beams, over a load-bearing wall not supported by timber that complies with at least grade 5 of
SANS 1783-2, and of size at least 114mm × 50mm, spaced not more than 500mm apart.
7. Drip trays
7.3
8. Discharge from valves
8.6
Blockage of discharge pipes from expansion control and safety valve due to freezing or foreign objects is possible.
8.10.
Discharge point has water traps.
8.11
Safety valve discharge pipe, not metallic.
10. Mains shut-off control
No expansion-relief device or vacuum-relief device intended to protect such water heater installed and/or installed
10.4
correctly.
11. Vacuum control valves
11.1
Vacuum control valves not installed in hot and/or cold water pipes.
11.2
Siphonage of the water heater is not prevented.
11.3
Vacuum breakers not mounted on 300mm risers.
11.4
Vacuum breaker piped directly above hot water outlet of the water heater.
12. Expansion control valve on cold water supply
Expansion control valve not installed downstream of any isolating valve, gate valve, non-return valve, or any other flow-
control device.
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April 2018 Volume 24 I Number 2