EMX, EMXO and EMXGO SERIES WATER BOILERS
34-503 07/13
7
5. The boiler is equipped with a temperature and pressure relief valve(s) rated for the input. Pipe the relief valve
discharge to a suitable open drain. The drain pipe may not be smaller than the relief valve opening and must
be secured to prevent it from lifting out of the drain under discharge pressure. Do not install valves or
restrictions in the discharge line.
6. Pipe the drain valve to a suitable open drain.
8 SERVICE
CLEARANCES
Allow sufficient space to provide adequate clearances on all sides for service and inspection. Recommended
clearance is 24” at the top and front, 18” at left and right sides of the appliance. Optional equipment may increase
the clearance requirements. Allow sufficient space for installing and servicing connections such as water, gas,
vent, combustion air, electrical, pump and other auxiliary equipment.
9 CLEARANCES TO COMBUSTIBLE SURFACES
The appliance must not be installed on a combustible floor, or on a non-combustible floor covering combustible
material. Clearance to unprotected combustible material must be 8” minimum at top, sides and rear, and 24”
minimum in front. Recommended access for service is 18” at sides and rear and 24” in front.
10 ELECTRICAL
WARNING: Turn off all electrical service to the appliance when accessing the controls located inside
the control cabinet. The cabinet contains high voltage wiring and terminals. If the electrical service is
not turned off and these wires or terminals are touched, a dangerous shock causing personal injury or
loss of life could occur. Close the control cabinet before restoring electrical service to the appliance.
1. Wiring to the unit should conform to the National Electrical Code or the code legally authorized in your
locality. A fused disconnect switch should be used for the boiler. When required, EPV boilers are equipped
with step-down transformers located within the NEMA enclosure. This allows for an effective single point
electrical connection to the boiler.
2. Be certain that high and low voltages are connected to the correct points.
3. When remote on/off or lead-lag enable operation is used, remove jumper from R1 and R2 and wire in
series.
4. A proper earth ground for this unit must be provided. A single conductor ground wire pulled from the
distribution panel to the sub panel (or some similar type) is recommended.
CAUTION: Use only copper wiring of proper sizing for incoming service. Damage resulting from use of
aluminum wiring will be excluded from coverage under the warranty of this unit.