HTP 850 LPHL - Manual (Page 49)

49
LP- 205 REV. 3.28.14
good indicators that air is removed include the absence of gurgling noises in the pipes and pump operation becoming very
quiet. Pressing
{S1} and {S2} together at any time will return the boiler control to normal operation.
i. After the system has operated for 30 minutes, eliminate any residual air by using the manual air vents located throughout the
system.
j. If purge valves are not installed in the system, open manual air vents in the system one at a time beginning with the lowest
floor. Close vent when water squirts out. Repeat with remaining vents.
k. Refill to correct pressure.
E. CHECK FOR GAS LEAKS
Before starting the boiler, and during initial operation, smell near the floor and around the boiler for gas odorant or any unusual odor.
Remove boiler front door and smell interior of boiler enclosure. Do not proceed with startup if there is any indication of a gas leak.
Repair any leaks at once.
PROPANE BOILERS ONLY – Propane suppliers mix an odorant with the propane to make its presence detectable. In some instances,
the odorant can fade, and the gas may no longer have an odor. Before startup (and periodically thereafter), have the propane supplier
verify the correct odorant level in the gas.
F. CHECK THERMOSTAT CIRCUIT(S)
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 the 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 reading 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
boiler low voltage terminal strip. Allow the boiler to cycle.
G. CONDENSATE REMOVAL
1. The boiler is a high efficiency condensing boiler. Therefore, the unit 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 neutralizer, if required by local authorities, can be made up of lime crystals, marble or phosphate chips that will neutralize
the condensate. This may be done by the installer or you may purchase a condensate neutralizer from HTP (7350-025).
2. The boiler is equipped with a ¾ FPT 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 (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 a 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.
H. FINAL CHECKS BEFORE STARTING BOILER
1. Read Startup Procedures within this manual for proper steps to start boiler. (See Startup Report 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. Fill condensate trap with water.