Filling And Draining; Introduction; Filling The Appliance; Filling Unvented Installations - A.O. Smith 28 30 50 60 Installation & Service Manual

gis gis
4
4.1

Introduction

4.2

Filling the appliance

4.2.1
4.2.2
Release R.1.3 UK

Filling and draining

Topics covered in this chapter:
• Filling the appliance.
• Draining the appliance.
The components referred to in these paragraphs are illustrated in

Filling unvented installations

To fill the appliance, proceed as follows.
1. Open the stop valve i in the hot water pipe and, if present, the stop valves
d for the circulation pump.
2. Shut drain valve g.
3. Open the nearest hot water draw-off point l.
4. Open the supply valve i on the cold water side a so that cold water flows
into the appliance.
5. Completely fill the appliance (when cold water flows at normal pressure from
the nearest hot water draw-off point, the appliance is full).
6. Bleed the entire installation of air, for example by opening all hot water draw-
off points.
7. The appliance is now under water supply pressure. There should be no
water coming out of the overflow valve m nor the T&P valvec. If this does
happen, the cause might be:
- The water supply pressure is greater than the specified 8 bar.
Rectify this by fitting a pressure-reducing valve a.
- The overflow valve in the protected cold supply setup is defective or
incorrectly fitted.

Filling vented installations

To fill the appliance, proceed as follows.
1. Open the stop valve i in the hot water pipe and, if present, the stop valves
d for the circulation pump.
2. Shut drain valve g.
3. Open the nearest hot water draw-off point l.
4. Open the supply valve i on the cold water side a so that cold water flows
into the appliance.
5. Completely fill the appliance (when cold water flows at normal pressure from
the nearest hot water draw-off point, the appliance is full).
6. Bleed the entire installation of air, for example by opening all hot water draw-
off points.
7. The appliance is now under water supply pressure. There should be no
water coming out of the T&P valve c. If this does happen, the T&P valve
might be defective or incorrectly fitted.
Introduction
Figure 4.1.
39