64
LP-520 REV. 5.1.17
4. When water flows freely from all hot water faucets, DHW purging is complete.
G. CHECK THERMOSTAT CIRCUIT(S)
1. Disconnect the two external wires connected to the appliance thermostat terminals (low voltage terminal strip).
2. Connect a voltmeter across these two incoming wires with power supplied 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
the appliance low voltage terminal strip. Allow the appliance to cycle.
H. CONDENSATE REMOVAL
1. This is a high efficiency condensing appliance. Therefore, the appliance has a condensate drain. Condensate fluid is nothing more
than water derived from combustion products, similar to that produced by an automobile when it is initially started.
Condensate 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, may be purchased from HTP (7450P-212).
2. The appliance is
provided with a ½” X ¾” reducing coupling that must be installed on the appliance before the condensate is piped to
a local drain. It is very important that the
minimum ¾” condensate line is sloped downward away from the appliance to a suitable inside
drain. If the condensate outlet on the appliance 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 condensate line to assure proper
drainage.
I. FINAL CHECKS BEFORE STARTING APPLIANCE
1. Verify the appliance and system are full of water and all system
components are correctly set for operation.
2. Fill the condensate trap with water.
3. Verify electrical connections are correct and securely attached.
4. 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 (this manual)
and local codes.
J. ADJUSTING GAS PRESSURE AT THE APPLIANCE
NOTE:
Refer to Figure 49 when adjusting gas pressure. Loosen the screw before checking the gas inlet pressure.
1. The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of
the system at test pressures greater than ½ psi (3.5 kPa).
2. The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures equal to or less than ½ psi (3.5 kPa).
Figure 49
–Gas Valve Detail
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