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Section 3. Installation
GAS PIPE SIZING
STAGE TWO "LOW PRESSURE" GAS PIPE SIZING
M
Table 2.
TESTING GAS PRESSURE
Before operating the heater, the heater and its gas connections must be leak tested. Do NOT use an open flame to test
for leaks. Test all gas connections for leaks with soapy water or another non-flammable method (see page 14).
The heater and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).
The heater must be isolated from the gas supply system by closing its individual manual shut-off valve during any pressure
testing of the gas supply at test pressures equal to or less than 1/2 psig (3.5 kPa).
CHECKING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
Risk of fire and explosion. Improper installation, incorrect adjustment, alteration, service, or maintenance of the Combination
Gas Control Valve can lead to fire or explosion, causing loss of life, personal injury, and/or property damage. If it is necessary
to adjust the gas valve, this must be done by only by a qualified service agency. These instructions are for the use of
qualified service technicians only!
This appliance is equipped
with an unconventional gas
control valve that is factory
set with a manifold
pressure of –.2" (–0.5cm)
wc. Installation or service
must be performed by a
qualified installer, service
agency, or the gas supplier.
If this control valve is
replaced, it must be
replaced with an identical
control.
The combination gas
valve incorporates dual shut-off valves and a negative-pressure regulator. For proper operation, the regulated pressure
at the outlet manifold of the valve must be –0.2" (–0.5cm) wc below the reference pressure at the blower mixer inlet,
and the gas valve 'VENT' tap must be connected to the end cap air orifice as shown in
Do not attempt to adjust the gas input by adjusting the regulator setting. The correct gas regulator setting is
required to maintain proper combustion and must NOT be altered.
Rev. M 1-8-15
P
P I
E
S
Z I
N I
G
M
A
X
M I
U
M
E
a N
u t
l a r
G
P
o r
a p
e n
/ 1
" 2
/ 3
" 4
O
D
L E
N
T A
P
R
O
N
T A
P
R
O
1
5 7
-
2
' 0
3
' 0
8
' 0
2
0 0
-
2
' 0
3
' 0
8
' 0
2
0 5
-
1
' 0
2
' 0
5
' 0
3
0 0
-
-
1
' 0
3
' 0
4
0 0
-
-
-
1
' 0
C
onnection
for Service
To Air Flow
Switch
F
O
R
G
A
S
L
N I
E
C
O
N
N
E
C
T
O I
F (
) . t
Q
I U
A V
E L
N
T
P
P I
E
E L
N
G
T
H
s a
t a
0 1
0 0
B
T .
U .
p .
r e
u C
c i b
o F
t o
G
s a
t a
5 2
0 0
B
T .
U .
p .
r e
u C
c i b
o F
t o
" 1
1
/ 1 -
" 4
1
/ 1 -
" 2
N
T A
P
R
O
N
T A
P
R
O
N
T A
P
R
2 1
' 5
5 2
' 0
5 4
' 0
0 6
' 0
-
-
2 1
' 5
5 2
' 0
5 4
' 0
0 6
' 0
-
-
7
' 0
5 1
' 0
5 2
' 0
0 5
' 0
0 6
' 0
-
5
' 0
0 1
' 0
0 2
' 0
5 3
' 0
0 4
' 0
0 6
' 0
2
' 0
6
' 0
0 1
' 0
5 1
' 0
0 2
' 0
5 4
' 0
WARNING
To Air Flow
Switch
To Gas
Valve Vent
To Low Side of
Differential Pressure Gauge
®
MASTERTEMP
Pool and Spa Heater Installation and User's Guide
N
S
" 2
2
/ 1 -
" 2
O
N
T A
P
R
O
N
T A
P
R
O
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0 4
' 0
-
-
-
C
onnection
To Gas
for Test
Valve Vent
To High Side
of Differential
Pressure Gauge
Vent
Pressure Tap
Figure
7.
15
Figure 7.
Pressure Tap
Inlet
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