37
VI. Water Piping and Trim
C. Standard Installation Requirements (continued)
b. Pressure drop through entire system must be
known, added to pressure drop through boiler,
and a circulator selected to provide required flow
at total calculated pressure drop.
c. It is often very difficult to accurately calculate
the pressure drop through the system.
d. In replacement installations, it may be nearly
impossible to get an accurate measurement of
piping amount and number of fittings in the
system. If system is zoned, the system flow rate
may drop well below recommended minimum
flow when only a single zone is calling for heat.
C. Standard Installation Requirements.
Observe the following guidelines when making the
actual installation of the boiler piping:
1. Safety Relief Valve (Required)
– The safety
relief valve is packaged loose with boiler and must
be installed in the location shown in Figure 19
“Factory Supplied Piping and Trim Installation”.
The safety relief valve must be installed with spindle
in vertical position. Installation of the safety relief
valve must comply with ASME Boiler and Pressure
Vessel Code, Section IV. The standard factory
shipped safety relief valve is set at 50 psi (340 kPa)
on PHNTM399 and PHNTM500. Optional 80 psi
(550 kPa) and 100 psi (689 kPa) safety relief valve
kits are available. If the safety relief valve is to be
replaced, the replacement valve must have a relief
capacity equal or exceeding the minimum relief
valve capacity shown on the heat exchanger ASME
plate. Also, when replacing the safety relief valve,
verify the temperature and pressure gage meets
ASME requirements for the replacement safety
relief valve. Pipe the safety relief valve discharge to
a location where hot water or steam will not create
hazard or property damage if the valve opens.
The end of the discharge pipe must terminate in an
unthreaded pipe. If the safety relief valve is not
piped to a drain, it must terminate at least 6 in. (150
mm) above the floor. Do not run safety relief valve
discharge piping through an area prone to freezing.
The termination of discharge piping must be in an
area where it will not become plugged by debris.
Table 13: Flow Range Requirement Through Boiler
Boiler
Model
Supply
Connection
(in.)
Return
Connection
(in.)
DT
= 35°F
DT
= 30°F
DT
= 25°F
ΔT
= 20°F
Minimum
Required
Flow (GPM)
Boiler
Head
Loss (ft.)
Required
Flow
(GPM)
Boiler
Head Loss
(ft.)
Required
Flow
(GPM)
Boiler
Head Loss
(ft.)
Maximum
Required
Flow
(GPM)
Boiler
Head
Loss (ft.)
PHNTM399
1-1/2
1-1/2
21.5
6.1
25.1
7.9
30.2
10.8
37.7
15.9
PHNTM500
1-1/2
1-1/2
27.1
6.9
31.7
8.9
38.0
12.1
47.5
17.6
Notes: Required Flow = Output*1000/(500*ΔT), where flow rate is in GPM, output is in MBH, and ΔT is in °F
Outputs for specific boiler models are provided in Table 2. See also Tables 14A and 14B for near boiler piping sizing.
Using boiler antifreeze will result in increased fluid density and may require larger circulators.
Содержание PHNTM399
Страница 6: ...6 I Product Description Specifications and Dimensional Data continued Figure 1A Phantom Model PHNTM399...
Страница 7: ...7 Figure 1B Phantom Model PHNTM500 I Product Description Specifications and Dimensional Data continued...
Страница 53: ...53 VIII Electrical continued Figure 26 Ladder Diagram...
Страница 54: ...54 VIII Electrical continued...
Страница 55: ...55 Figure 27 Wiring Connections Diagram VIII Electrical continued...
Страница 63: ...63 IX System Start up continued Phantom Series Operating Instructions Figure 32 Operating Instructions...
Страница 113: ...113 THIS PAGE LEFT BLANK INTENTIONALLY...
Страница 114: ...114 XIII Repair Parts continued PHNTM399 and PHNTM500...
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