Gas Pipe Sizing; Testing Gas Pressure/Gas Pressure Requirements - Pentair MASTERTEMP 125 Installation And User Manual

GAS PIPE SIZING

STAGE TWO "LOW PRESSURE" GAS PIPE SIZING
PIPE SIZING FOR GAS LINE CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH
Natural Gas at 1000 B.T.U. per Cubic Foot
Propane Gas at 2500 B.T.U. per Cubic Foot
1/2" 3/4"
MODEL NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO
125 - 20' 50' 80'
TESTING GAS PRESSURE
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!
C
onnection for Service
To Air Flow
Switch
To Gas
Valve Vent
Figure 7.
CAUTION
The use of Flexible Connectors (FLEX) is NOT recom-
mended unless they are properly sized according to
the supplier recommendations for the heater rating.
Rev. B 8/14
(Ft.)
1" 1-1/4" 1-1/2"
125' 250' 450' 600' - -
To Air Flow
Switch
To Low Side of
Differential Pressure Gauge
2" 2-1/2"
- - - -
Table 2.
WARNING
To Gas
Valve Vent
To High Side
of Differential
Pressure Gauge
Vent
Pressure Tap
GAS PRESSURE REQUIREMENTS
MASTERTEMP
NATURAL AND PROPANE:
MAXIMUM INLET: 14 INCHES W.C.
MASTERTEMP ® 125 Pool and Spa Heater Installation and User's Guide
Section 3. Installation
C
onnection for Test
Pressure Tap
Inlet
®
125 HEATER GAS PRESSURE:
15
–.2