Lochinvar CREST 2.5 User Manual

This manual must only be used by
a qualified heating installer / service
technician. Read all instructions,
including this manual and the Crest
Service Manual, before installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
 WARNING
Save this manual for future reference.
FB-I-O Rev I
Installation & Operation Manual
Models: 1.5 - 2.0 - 2.5 - 3.0 - 3.5

Lochinvar CREST 2.5 Specifications

General

Model	CREST 2.5
Type	Condensing Boiler
Input Capacity	2, 500, 000 BTU/hr
Fuel Type	Natural Gas or Propane
Brand	Lochinvar
Efficiency	Up to 98%
Vent Type	Direct Vent

Summary

Please Read Before Proceeding

1. DETERMINE BOILER LOCATION

Installation Must Comply With

Provide Clearances

Specifies required clearances for safe operation and service.

1. Determine Boiler Location (Continued)

Prevent Combustion Air Contamination

Warnings about contaminants affecting combustion air quality.

1. Determine Boiler Location (Continued)

Corrosive Contaminants and Sources

Lists products and areas to avoid for combustion air intake.

2. GENERAL VENTING

Direct Venting Options

2. General Venting (Continued)

Install Vent and Combustion Air Piping

Instructions for proper installation and sealing of vent/air piping.

Air Contamination

Warnings about contaminants affecting boiler and safety.

3. VERTICAL DIRECT VENTING

Vent/Air Termination – Vertical

4. SIDEWALL DIRECT VENTING

Vent/Air Termination – Sidewall

5. HYDRONIC PIPING

General Piping Information

Essential steps and components for system piping.

6. Gas Connections

Connecting Gas Supply Piping

Step-by-step instructions for connecting the gas supply.

6. Gas Connections (Continued)

Natural Gas Supply Pressure Requirements

Check Inlet Gas Supply

Procedure for verifying correct gas supply pressure.

7. FIELD WIRING

Line Voltage Connections

Guidance for connecting 120 VAC power to the boiler.

7. Field Wiring (Continued)

Low Voltage Connections

Instructions for routing and connecting low voltage wiring.

8. CONDENSATE DISPOSAL

Condensate Drain

9. START-UP

Fill and Test Water System

Procedures for filling the system and checking for leaks.

9. Start-up (Continued)

Check for Gas Leaks

Critical safety check for gas leaks using a bubble test.

Final Checks Before Starting the Boiler

Pre-startup checklist for safety and proper operation.

Check Flame and Combustion (Continued)

Figure 9-2 Operating Instructions

Operating Instructions

Step-by-step guide for safely starting the boiler.

To Turn Off Gas to Appliance

11. MAINTENANCE

Service Technician

11. Maintenance (Continued)

Check All Piping for Leaks

Check Boiler Relief Valve

Inspect Ignition and Flame Sense Electrodes

Handling Ceramic Fiber Materials