Installing A Pressure Relief/Drain Valve - Truma Combi eco Installation Instructions Manual

Installing a pressure relief/drain valve

The Combi furnace with indirect supplementary
water heating must be installed with a pressure
relief/drain valve (Fig. 31 – 1) that complies with
the standard for Relief Valves for Hot Water
Supply Systems, ANSI Z21.22 / CSA 4.4. We
recommend installing the Truma pressure relief/
drain valve (65.25 psi (4.5 bar) – not included in
scope of supply).
• The pressure relief/drain valve must be ac-
cessible for servicing or replacement.
• The drain and test lever (Fig. 31 – 2) must
likewise be accessible.
• Install the pressure relief/drain valve in the
cold water line – between the non-return
valve and the Combi furnace.
9
11
10
7
close
Diameter 0.7 in. (18 mm)
Fig. 31 Installation example
1 Truma pressure relief/drain valve
2 Drain and test lever
3 Drainage socket
4 Drainage hose
5 Screws B 5.5 x 25 mm (2 screws)
6 1/2 in. PEX x 1/2 in. NPT female threaded
adapter
7 1/2 in. CTS PEX tube
8 Cold water line inlet 1/2 in. CTS PEX tube
9 1/2 in. x 1/2 in. x 1/2 in. PEX tee
10 Cold water line outlet 1/2 in. CTS PEX tube
11 Crimp ring or clamp
22
8
11
1/2 in. NPT
6
1
5
close
4
open
1. Drill a hole in the floor.
2. Slide the hose (Fig. 31 – 4) onto the drainage
socket (Fig. 31 – 3).
3. Install the drainage hose (Fig. 31 – 4) in a
straight line to the outdoors, where it must
terminate in a splash-proof position. Install a
splash guard, if necessary.
4. Use 2 screws (Fig. 31 – 5) to secure the pres-
sure relief/drain valve.
Laying water lines
• Connect built-in components of the water
system to the water lines; see"Water instal-
lation" on page 19.
• Regarding 1/2 in. CTS water lines for con-
nections to 12-mm push-fit system: Install an
adaptor; see"Installing a 12 mm / 1/2 in. CTS
adaptor" on page 20.
Connecting the water container
2
3
Fig. 33
1 Cold water connection
Elbow fitting (push-fit 12 mm; blue)
2 Cold water line – 1/2 in. CTS
3 Hot water connection
Elbow fitting (with aeration valve; push-fit
12 mm; red)
3a Hose nozzle of the aeration valve
4 Adaptor 12 mm to 1/2 in. CTS
5 Hot water line – 1/2 in. CTS
3a
3
4
5
6 6
7
1
45º
0.8 in. (20 mm)
2
4