Setting A Replacement Gas Valve - Lochinvar CP-M Series Installation, Commissioning & Maintenance Instructions

16.8

SETTING A REPLACEMENT GAS VALVE

When a replacement gas valve is fitted, the following procedure must be carried out in the order stated when the
boiler is switched on for the first time. Failure to follow the following procedure may lead to non-warrantable
damage to the boiler.
Boiler
Type
CP-M+120
CP-M+150
CP-M+180
TABLE 16.2
boiler type
CP-M+60-120
CP-M+ 150
CP-M+ 180
Cf. EN437
1
All values are measured without boiler door.
2
2
1
3
CP-M+60
1. Turn screw 2 (Figure 16.1) clockwise until fully closed. On models with two gas valves, this should be
done to both valves.
2. Turn screw 2 counter clockwise in accordance with Table 16.1. On models with two gas valves, this
should be done to both valves.
3. On models CP-M+120, CP-M+150 & CP-M+180, remove the screw from the outlet pressure test point of
the left hand gas valve (identified as screw 4 in Figure 16.1) and attach a manometer.
Number of Turns Open
Boiler
Type
Nat. Gas G20
CP-M+60
CP-M+80 1.5
CP-M+100 3.5
CP-M+120 *2.25
CP-M+150 *2.25
CP-M+180 *4.25
* Both gas valves must be opened this number of turns
TABLE 16.1 PRE-ADJUSTMENT OF GAS VALVES
"p-out" Pressure at Gas Valve
Nat. Gas G20
-2 to 0 Pa
-2 to 0 Pa
-2 to 0 Pa
PRESSURE ADJUSTMENT OF LEFT GAS VALVE
load
CO (%)
2
max. load 9.0 (± 0.3)
2
min. load 8.7 (± 0.3)
max. load 9.0 (± 0.3)
2
min. load 8.7 (± 0.3)
max. load 9.0 (± 0.3)
2
min. load 8.7 (± 0.3)
TABLE 16.3 COMBUSTION GAS READINGS
3
1
2
CP-M+80 & 100
FIGURE 16.1
(Counterclockwise)
Propane G31
1 0.5
0.75
1.5
*1
*1
*2.25
Propane G31
-4 to -2 Pa
-7 to -5 Pa
-7 to -5 Pa
G20 G31
1
O (%) CO (%)
2 2
4.8 (± 0.5) 10.3 (± 0.3)
5.3 (± 0.5) 9.3 (± 0.3)
4.8 (± 0.5) 10.4 (± 0.3)
5.3 (± 0.5) 9.3 (± 0.3)
4.8 (± 0.5) 10.5 (± 0.3)
5.3 (± 0.5) 9.3 (± 0.3)
4
1
CP-M+120
GAS VALVES
1
O (%)
2
5.2 (± 0.5)
6.7 (± 0.5)
5.0 (± 0.5)
6.7 (± 0.5)
4.7 (± 0.5)
6.7 (± 0.5)
3
1 1
2
4
CP-M+150 & 180
2
1
3
81