Electrical Connections - Ace Heating Solutions Atlas A050 Operating And Maintenance Manual

Caution: Never operate the pump dry, the system must be filled before starting the pump. Ensure all isolation valves are
open before start up.
An optional pump can be ordered through Ace sized for the boiler. If a pump is ordered, a Wilo Top Z 2x30 single phase,
Bronze, Lead free pump will be supplied. Flange kits are also provided with the pump to fit the boiler connection sizes.
Pumps flange kits for A050-A150 include two 2" flange kits. Pumps flange kits for A200-A300 include 2 ½" flange kits. The
same pump will be used on for all Atlas units, but power setting will changed for different size boilers. The setting will be
preset from factory, but can be checked by opening the terminal box on the pump. The A050-A150 should be set on the
"MIN" setting and the A200-A300 should be set for "MAX" setting. Please refer to the supplied WILO Installation Manual
for more detail.
Pump Overload Protection
A fused plug or circuit breaker in the power line is required.
The pump must be connected to the electrical supply via an external
contactor/relay to provide thermal overload protection. The
contactor/relay must be connected to the built-in thermal overload
switch terminals P1 and P2 (potential-free normally closed contact,
contact load 250 VAC/1A) to protect the pump against thermal
overloading at all speeds.
If the pump is protected by means of a motor starter, the starter must
be set to the current consumption of the pump at the selected speed.
The motor starter setting must be changed every time the pump
speed is changed. The current consumption at the individual speeds
is stated on the pump rating plate.

2-9 Electrical Connections

Installations must follow these codes
x
National Electric Code and any other national, state, provincial or local codes or regulations having jurisdiction
x
Safety wiring must be NEC class 1.
x
Boiler must be grounded as required by the NEC ANSI/NFPA 70.
x
In Canada, CSA C22.1 C.E.C. Part 1.
The Atlas A050 – A100 boilers are wired for 120 VAC, 10 amps, while models A150 – A300 are wired for 120 VAC, 15
amps, although the units current will usually be much lower. Before starting the boiler, check to ensure proper voltage is
supplied to the boiler and pump (if supplied).
For multiple unit installations, each unit is to be wired in parallel with other units so that each unit will operate
independently.
The circulating pump (and the return pump if used) should be wired in parallel with the unit(s) to run independently of the
unit.
If any of the original wiring as supplied with the unit is replaced, it must be replaced with 16 AWG, 105
equivalent.
23
°
C. wire or its
Rev 2.1