Pentair MASTERTEMP 125 Installation And User Manual

Rev. B 8/14 MASTERTEMP
®
125 Pool and Spa Heater Installation and User’s Guide
15
GAS PIPE SIZING
Table 2.
Section 3. Installation
STAGE TWO “LOW PRESSURE” GAS PIPE SIZING
PIPE SIZING FOR GAS LINE CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH (Ft.)
Natural Gas at 1000 B.T.U. per Cubic Foot
Propane Gas at 2500 B.T.U. per Cubic Foot
MODEL
1/2” 3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2”
NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO
125 - 20’ 50’ 80’ 125’ 250’ 450’ 600’ ------
TESTING GAS PRESSURE
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CHECKING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
WARNING
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!
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To Air Flow
Switch
To Gas
Valve Vent
Vent
Pressure Tap
To High Side
of Differential
Pressure Gauge
To Low Side of
Differential Pressure Gauge
Pressure Tap
Inlet
Figure 7.
Connection for Service
To Air Flow
Switch
To Gas
Valve Vent
Connection for Test
GAS PRESSURE REQUIREMENTS
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.
MASTERTEMP
®
125 HEATER GAS PRESSURE:
NATURAL AND PROPANE:
MAXIMUM INLET: 14 INCHES W.C.

Pentair MASTERTEMP 125 Specifications

General

BTU Output	125, 000 BTU/hr
Fuel Type	Natural Gas or Propane
Ignition System	Electronic
Minimum Flow Rate	20 GPM
Maximum Working Pressure	50 PSI
Efficiency	82%
Water Connections	1.5 inch
Certifications	ANSI Z21.56
Voltage	120V