35
Installation & Service Manual
5
Electrical connections
This appliance is wired for 120 VAC service. The appliance,
when installed, must be electrically grounded in accordance
with the requirements of the authority having jurisdiction
or in the absence of such requirements, with the latest
edition of the National Electrical Code ANSI/NFPA No. 70.
When the appliance is installed in Canada, it must conform
to the CAE C22.1, Canadian Electrical Code, Part 1 and/or
local Electrical Codes.
1. All wiring between the appliance and field installed
devices shall be made with type T wire [63°F (35°C)
rise].
2. Line voltage wire exterior to the appliance must be
enclosed in approved conduit or approved metal clad
cable.
3. The pump must run continuously when appliance is
being fired (hot water supply appliances must use the
optional pump delay or intermittent pump controller
if the pump is to be cycled).
4.
To avoid serious damage,
DO NOT
energize the appliance
until the system is full of water. Serious damage may
result.
5. Provide the appliance with proper overload protection.
6. Install wall thermostat on inside wall.
DO NOT
install
thermostat in an area affected by drafts, sunlight, light
fixtures, hot or cold water pipes or near a fireplace.
TABLE 5A
AMP DRAW DATA
150,000 - 300,000 Btu/hr Models
Firing Control
Fan
Valve/
Controls
Max
Total Amps
at 120 VAC
F-9 (Single Stage)
1.15
3.97
5.12
M-9 (Two-Stage)
1.15
4.15
5.30
Pump Wiring
The circulating pump must be purchased locally. The
maximum load for the pump switched by the internal
pump relay must not exceed 1 HP. The current draw for
a field installed 120 VAC pump MUST be added to the
appliance’s current draw to determine the minimum wire
size for 120 volt service.
Figure 5-1 Control Panel
Temperature adjustment
NOTICE
The temperature controller is pre-set at
the factory with test settings. You may
need to adjust the settings to meet your
specific needs.
WARNING
Return water temperatures must not be
less than 140°F.
Locating Temperature Control
Remove the control panel door on the front of the appliance
in order to locate and access the temperature control.
Temperature Control Settings
There are three setting knobs on the temperature control.
The three setting knobs on the temperature control are for
Set point, Differential, and High-Fire Offset (see FIG. 5-2).
Figure 5-2 Temperature Control
Summary of Contents for Efficiency-Pac EW 150 -- 300
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