Trinity Lx │Installation and Operation Instructions Lx Series
50
Table 11-1 Hot Water Boiler Checklist for Controls and Safety Devices
Applicable Paragraph
Certification and Reporting
Requirements
Input Btuh
400,000 to
2,500,000
ASME
CSD-1
CAN
1-3.1-77
Compliance Means/Measures
Operating Controls
Forced Circulation
Flow Switch (in lieu of LWCO)
Required
CW-130(a),
CW-210(a)
- Flow Switch - Factory installed.
Water Temperature Required CW-410(b) 2.15.5
Separate sensing elements and
switching contacts for temperature
and high limit. ASME CSD-1
compliant.
High Gas Pressure Switch
2,4
Optional CF-162 2.10 - 2.12
Low Gas Pressure Switch
2,4
Optional CF-162 2.10 - 2.12
Canada - Only required on High
Pressure Gas Trains (> 5 psig).
Valve Train for Low Pressure Gas
Manual Shut-off Valves Required (2)
CF-150
(a),(b),(d)
2.10.3.2,
2.10.3.3,
2.10.3.4
Lubed plug-type, lever handle.
Down Stream - Factory installed.
Up Stream - Factory supplied; Field
installed.
Valve Leak Tests Required (2) CF-150(d) 2.13 Capped ports fitted.
Gas Pressure Regulator Required
CF-160,
Fig. B-3
2.10.1
Integral vent limiter, regulator part
of Combo Gas Valve.
Valve Closing Time
4
5 sec, max
CF-180(e)
2.4.2,
2.10.2.2.4
Less than 1 sec.
Safety Controls and Relief Valves
Low Water Fuel Cutoff
2
Water Tube Boilers
N/A CW-130 2.15.1
LWCO not required on water tube
boilers; flow switch is mandatory.
If required by other codes, must be
installed as a Limit.
Water Temperature, High Limit
2
Limit CW-410(c) 2.15.1 ASME CSD-1 compliant.
Safety Relief Valve Required CW-510 - Factory supplied; Field installed.
Approved Safety Shut-off Valve Required CF-180(b)1 2.10.2
2xSSOV in one valve body, series
valves, independently operated.
Combustion Air Switch
4
Recycle CF-220(a) 2.8.3 Action on loss of combustion air
High Gas Pressure Switch
2,4
N/A or Limit CF-162 2.10 - 2.12
Low Gas Pressure Switch
2,4
N/A or Limit CF-162 2.10 - 2.12
In Canada, only required on High
Pressure Gas Trains (>5 psig).
Pre-ignition Purging
4
4
air changes
in 90 sec
CF-210 - Auto Pre-purge.
Flame Safeguard (Primary) Required CF-310 2.4.1, 2.4.2 Manual Reset as per CG-610.
Flame Detector Required CF-310 2.4.1, 2.4.2 Manual Reset as per CG-610.
Combustion Air
1
Optional CG-260 2.8 See Table 4.8 in this manual.
Notes:
1
If drawing combustion air from the room supply, interlocking fan-damper-burner is required to prove combustion air.
Damper interlock not required if louver (grilled) fixed in the open position. Not required for direct vent systems.
2
If switch installed, functioning of switch shall cause safety shutdown and lockout requiring a manual reset.
3
Controller meets requirements for power up with lockout. Manual Reset from controller or touchscreen display only.
4
Refer to ASME CSD-1, Table CF-3 for additional requirements or details.
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