WarmFlo EMB-H Installation and Operation Manual

05/19/2016 9 BI308
TROUBLESHOOTING HELPS
Inside monitor – there are two red LED’s on the inside labeled “STG1” and “STG2”. Each LED is an
indication of stages of boiler on/off.
Located near the thermostat connection is a red LED labeled “MANUAL-HL-OK”. This LED represents the
205° manual reset. If on, manual hi-limit is closed. If off, manual hi-limit is open.
Sequence
 At heat call, pump turns on (control board top cube relay and orange wires).
 Elements remain off for 30 seconds.
 If the sensor is detecting supply water temperature approximately 8° less than set point, both stage 1 and
stage 2 turn on (stage 2 may have a 2-minute delay).
 As the outlet temperature approaches the set point, element 1 begins to modulate.
 At set point element 1 is off or 0%.
 At +5° above set point element 2 is off.
 At set point element 1 modulates.
 At 5° below set point element 1 is at 100% and element 2 turns on.
Mechanical hi-limit, top vessel screw-in, automatic reset – this is at about 190° F, opens the red/white wire
loop. This can be monitored by the “Auto Reset” front indicator light. As the water cools to approximately
150° it should self reset and restart.
Manual reset limits – surfaced mounted to the top of the vessel, opens at 205° F. This opens all 24V control
power thus opening all element power relays. The observed action is the same as a blown fuse, no front panel
boiler power LED.
To reset this device, simply press the red button located on the limit switch.
Comment: The hi-limit auto reset LED and utility off-peak LED are only on during an active heat call
(lower red LED on).
WARMFLO
®
TEMPERATURE BYPASS TROUBLESHOOTING OR TESTING
Adding a jumper between “W” screw terminal and tab marked “E” bypasses the temperature sensing and
WarmFlo control. In other words, with the jumper installed, a “W” input represents both stages, full on.
Note: Basic 24V power must be present for the E-tab function to work.
Flow Switch Statement
A flow switch is not included with the boiler. However, one can be added to the LMC circuit. Simply place the
field provided flow switch in series with this circuit.
NOTE: The “L/W” (J3) jumper must be in the “W” position.
AVAILABLE, ELECTRO INDUSTRIES, INSTALL PARTS OR KITS
EMB-BK MINI-BOILER PLUMBING KIT BASIC
EMB-PK MINI-BOILER INSTALL KIT PREFERRED
EMB-P2 PUMP KIT 1/25HP BOILER
ES-24-BR STAT DIG SLAB/ROOM/ROOM 24VAC
WFS2 TEMPERATURE WATER SENSOR
EB-5415A ZONE CONTROLLER
EMBH5636 REPLACEMENT CONTROL BOARD
4038 TRIAC MODULE
5127 ELEMENT RELAY
5541 TRANSFORMER, 24V/40VA
5576 AIR ELIMINATOR 3/4" ROLLAIRTROL
5456A GAUGE PRES/TEMP 75 PSI/320DG F .25"
5453 VALVE RELIEF 30 PSIG .75” NPT MALE
5590 EXPANSION TAN K 40K BTU 20.1 GALLON