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36
PRE-START-UP
Filling System-Heating Heaters
F
ill system with water. Purge all air from the system
using purge valve sequence. After system is purged of
air, lower system pressure. Open valves for normal
system operation, fill system through feed pressure.
Manually open air vent on the compression tank until
water appears, then close vent.
Domestic Hot Water Heaters
Purge all air from system before lighting heater. This
can be normally be accomplished by opening a down-
stream valve.
Inspect Venting System:
1. Check all vent pipe connections and flue pipe
material.
2. Ensure vent terminations are installed per code
and are clear of all debris or blockage.
Pre-Start-Up Check
1. Verify heater is filled with water.
2. Check system piping for leaks. If found, repair
immediately.
3. Vent air from system. Air in system can interfere
with water circulation.
4. Purge air from gas line up to heater.
INITIAL START-UP
Tools Needed
• One 8–0–8, 16” scale manometer
• Two 6–0–6, 12” scale manometers
• 7/16” open end wrench
• 1/2” open end wrench
• Screwdriver (Standard & Phillips)
• 3/8” open end wrench
• Multi-meter
• 3/16” Allen wrench
• 3/32” Allen wrench (Honeywell or White-Rodgers
gas valve)
• 5/32” Allen wrench (Invensys gas valve)
• #10 Torx driver w/center hole (Invensys gas valve)
Preparation for Start-Up
Check Power Supply
With volt meter at incoming power check voltage
between:
Hot - Common (~120 VAC)
Hot - Ground (~120 VAC)
Common - Ground (< 1 VAC)
Attach Manometers to Measure
Pressures
• Attach 16" scale manometer to the main gas shut-
off valve supply pressure tapping.
• Attach one 12" scale manometer to the manifold
gas pressure tapping. (See gas valve detail on
page 7.)
• Attach one 12" scale manometer to the tee near
the blower housing.
NOTE: Digital manometers are not recommended.
WARNING: If Common - Ground is > 1 VAC,
STOP: Contact electrician to correct ground failure.
Failure to do this may burn out 120V-24V
transformer, or may cause other safety control
damage or failure.
Fig. 30: Check Power Source
WARNING: Do not turn on gas at this time.