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NOTES:
1. Transformer for ERV wheel only used on 460-v, 575-v, 115-v ERV units.
2. On single-phase ERV units the L3 and T3 terminals on supply blower contactor and exhaust blower contactor
are not used.
3. Overload thermal protection only used on 62M330-640 units with 5 hp and 7
1
/
2
hp motors.
4. Red wire not used on 115-v, 208/230-v single-phase units.
5. Wire color determined by primary voltage and transformer type used.
6. On 115-v units, L2 becomes neutral. On 208/230-v single-phase units, L3 does not exist.
7. On units with total fusing greater than 30 amps, when pre-heater is installed and fused disconnect option is
selected, fusing will be separated. ERV and pre-heater will have separate fusing.
8. DPDT relay may be substituted. If so, pins 2, 5 and 8 will not exist.
9. Follow all local and other applicable codes.
10. Only qualified electrical contractors should install or service these ERV units.
11. For electrical characteristics (FLA, MCA) refer to charts in this booklet.
12. This diagram is for constant volume units.
Before performing service or maintenance operations on 62M unit,
turn off power switches to unit. Multiple switches may exist. Electrical
shock could cause personal injury or death.
LEGEND
3PDT — Three Pole, Dual Throw Relay FLA — Full Load Amps
DPDT — Dual Pole, Dual Throw Relay GRD — Ground
ERV — Energy Recovery Ventilator MCA — Minimum Circuit Amps
FIOP — Factory-Installed Option OTP — Overload Thermal Protection
Fig. 50 — Typical Wiring Schematic, High Voltage