HTP ELP-199 - Manual (Page 52)

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LP-294 REV. 2.20.14
If you discover any evidence of a gas leak, shut down the boiler at once. Find the leak source with a bubble test and repair immediately.
Do not start the boiler again until the leak is repaired. Failure to comply could result in substantial property damage, severe personal
injury, or death.
E. CHECK THERMOSTAT CIRCUITS
1. Disconnect the two external wires connected to the boiler thermostat terminals (low voltage terminal strip).
2. Connect a voltmeter across these two incoming wires with power applied to thermostat circuits. Close each thermostat, zone valve
and relay in the external circuit one at a time and check the voltmeter reading across the incoming wires.
3. There should NEVER be a voltage reading.
4. If a voltage does occur under any condition, check and correct the external wiring. (This is a common problem when using 3-wire
zone valves.)
5. Once the external thermostat circuit wiring is checked and corrected if necessary, reconnect the external thermostat circuit wires to
the boiler low voltage terminal strip.
When a powered transformer circuit exists in the installation location, the polarity of the thermostat connection may result in constant
circulation or operation. Reversal of the thermostat connections will correct this issue.
6. Allow the boiler to cycle.
F. CONDENSATE REMOVAL
1. The boiler is a high efficiency condensing boiler, and the boiler has a condensate drain. Condensate fluid is nothing more than water
vapor, derived from combustion products, similar to that produced by an automobile when it is initially started.
Condensation is slightly acidic (typically with a pH of 3 to 5) and must be piped with the correct materials. Never pipe the condensate
using steel, copper, brass or other materials that will be subject to corrosion. Plastic PVC or CPVC pipe are the only approved
materials.
A condensate filter, if required by local authorities, can be made up of lime crystals, limestone or phosphate chips that will neutralize the
condensate. This may be done by the installer or you may purchase a condensate neutralizer from HTP (Part # 7450P-212).
2. The boiler is equipped with a ¾ female socket weld fitting connection that must be piped to a local drain. It is very important that the
condensate line is sloped downward away from the boiler to a suitable inside drain. If the condensate outlet on the boiler is lower than
the drain, you must use a condensate removal pump, available from HTP (Part # 554200). This pump is equipped with two leads that
can be connected to an alarm or another type of warning device to alert the user of condensate overflow, which, if not corrected, could
cause property damage.
3. If a long horizontal run is used, it may be necessary to create a vent in the horizontal run to prevent a vacuum lock in the condensate
line.
4. Do not expose the condensate to freezing temperatures.
5. It is very important you support the condensation line to assure proper drainage.
G. FINAL CHECKS BEFORE STARTING BOILER
1. Read Startup Procedures within this manual for proper steps to start boiler. (Use Startup Report in this manual to record steps for
future reference.)
2. Verify the boiler and system are full of water and all system components are correctly set for operation.
3. Ensure condensate trap is full of water. Fill condensate trap by pouring three cups of water into the exhaust opening of the boiler
before the exhaust pipe is connected.
4. Verify electrical connections are correct and securely attached.
5. Inspect exhaust vent and intake piping for signs of deterioration from corrosion, physical damage or sagging. Verify exhaust vent and
intake piping are intact and correctly installed per Venting Section, (Part 6) and local code.