Use and Care Manual

Figure 11

K. SINGLE ZONE WIRING

1. 120 Volt Wiring - The boiler should be provided

with its own 15A branch circuit with fused

disconnect. All 120 volt connections are made

inside the HydroStat relay as follows (see Figures

11a and 11b).

• Hot (“black”) - Wire Nut with Black wire of ON/

OFF Toggle Switch

• Neutral (“white”) - Terminal “L2”

• Ground (“green” or bare) - Ground screw on the

case

2. Thermostat Wiring - Follow thermostat

manufacturer instructions. To insure proper

thermostat operation, avoid installation in areas of

poor air circulation, hot spots (near any heat source

or in direct sunlight), cold spots (outside walls,

walls adjacent to unheated areas, locations subject to

drafts). Provide Class II circuit between thermostat

and boiler. Connect thermostat wire leads to

terminals “T” and “T” (see Figures 11a and 11b).

TABLE 5: TWO-STAGE UNITS (3450 RPM)

TWO-PIPE SYSTEMS

Lift "H"

(See Figure)

Maximum Length of Tubing

"H" + "R" (See Figure)

3/8" OD

Tubing (3 GPH)

1/2" OD

Tubing (3 GPH)

0' 93' 100'

2' 85' 100'

4' 77' 100'

6' 69' 100'

8' 60' 100'

10' 52' 100'

12' 44' 100'

14' 36' 100'

16' 27' 100'

18' --- 76'